A dual-tuner USB TV stick circuit

Abstract

This utility model relates to the field of digital television technology, specifically to a dual-tuner USB TV stick circuit, including an antenna interface. Through the design of first and second dual tuners and dual demodulation circuits, it achieves parallel frequency selection, amplification, and demodulation of two terrestrial broadcast digital television signals, supporting users to watch two programs simultaneously or record another program while watching the first. This overcomes the functional limitations of single-tuner devices, greatly improving the flexibility and diversity of program reception. The low-noise amplifier (LNA) in the signal amplification circuit performs noise reduction and amplification on the signal received by the antenna, ensuring signal quality. The signal conversion circuit converts the TS stream signal into a USB signal, which is then separated and transmitted via a USB hub circuit, ensuring stable signal flow within the device, reducing signal loss and interference, and providing a high-quality signal source for subsequent playback and recording. The SD / TF card recording circuit, in conjunction with the USB hub circuit, enables local storage of the program stream, eliminating the need for users to rely on the main device's memory space.

Description

Technical Field

[0001] This utility model relates to the field of digital television technology, specifically to a dual-tuner USB TV stick circuit. Background Technology

[0002] With the rapid development of digital television technology, terrestrial digital television signal receiving equipment has become an important medium for users to access television content. Most USB TV dongle products currently on the market use a single tuner design, an architecture with significant limitations. At any given time, if a user has two favorite programs on different frequencies, they can only choose one to play, unable to simultaneously watch multiple programs, greatly restricting their viewing choices and experience. Furthermore, with the widespread adoption of mobile internet, users' demand for watching television programs in high-speed mobile environments (such as cars and high-speed trains) is constantly increasing. In this mode, problems such as unstable signals and frequent interruptions exist, severely impacting the user's viewing experience. Such products on the market usually do not have recording and storage functions. Even if they can record, the program content needs to be burned and stored on the main device, which will cause a large amount of memory space to be occupied on the main device, causing inconvenience to users.

[0003] Technological innovation and optimization are urgently needed. Therefore, how to further improve the performance of dual-Tuner USBTV Dongles under the existing technical architecture, and solve problems such as simultaneous viewing of multiple frequency programs, stability of mobile signal reception, and storage consumption, has become a key direction for current technological research and development in this field. Utility Model Content

[0004] To address the shortcomings and deficiencies of existing technologies, this invention provides a dual-tuner USB TV stick circuit that not only supports simultaneous reception of programs from two different channels but also enables simultaneous viewing and recording.

[0005] To achieve the above objectives, the present invention provides a dual-tuner USB TV stick circuit. This circuit includes an antenna interface, a USB Type-C interface, a host device, a signal amplification circuit, an SD / TF card recording circuit, a USB hub circuit, a first dual-tuner and dual-demodulation circuit, a second dual-tuner and dual-demodulation circuit, and a signal conversion circuit for converting TS stream signals into USB signals. An RF antenna is soldered onto the antenna interface. The input terminal of the signal amplification circuit is electrically connected to the antenna interface. The signal amplification circuit is bidirectionally communicatively connected to the first and second dual-tuners and dual-demodulation circuits. Both the first and second dual-tuners and dual-demodulation circuits are bidirectionally communicatively connected to the signal conversion circuit. The signal conversion circuit is bidirectionally communicatively connected to the USB hub circuit. The USB hub circuit is bidirectionally communicatively connected to the SD / TF card recording circuit, and an SD / TF card is installed on the SD / TF card recording circuit. The output terminal of the USB Type-C interface is communicatively connected to the host device.

[0006] Further, the signal amplification circuit includes a bidirectional high-speed switching diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor, a seventh inductor, a low-noise amplifier, and a transformer. The first capacitor, second capacitor, first inductor, third capacitor, and second inductor are connected in series, with one end grounded and the other end electrically connected to the antenna interface. The bidirectional high-speed switching diode is electrically connected to the common terminal of the first capacitor and the second capacitor. The third inductor and fourth inductor are connected in series, with one end electrically connected to the first inductor and the other end electrically connected to the sixth pin of the low-noise amplifier, and the fifth pin of the low-noise amplifier is grounded. The fourth capacitor, fifth inductor, first resistor, and sixth inductor are connected in series, with one end grounded and the other end electrically connected to the first pin of the low-noise amplifier. One end of the fifth capacitor is grounded and the other end is electrically connected to the fifth inductor. The second pin of the low-noise amplifier is electrically connected to the fifth capacitor. One end of the sixth capacitor is grounded, and the other end is electrically connected to the fourth pin of the low-noise amplifier. One end of the second resistor is electrically connected to the sixth capacitor, and the other end is connected to a power supply circuit. The seventh capacitor and the third resistor are connected in series, with one end electrically connected to the first pin of the low-noise amplifier and the other end electrically connected to the third pin of the transformer. The fourth pin of the transformer is electrically connected to the second resistor. One end of the eighth capacitor is grounded, and the other end is electrically connected to the fourth pin of the transformer. The third resistor and the seventh inductor are connected in series, with one end electrically connected to the third pin of the transformer and the other end electrically connected to the first pin of the transformer. The third pin of the transformer is electrically connected to the first dual tuner and dual demodulation circuit. The first pin of the transformer is electrically connected to the second dual tuner and dual demodulation circuit. One end of the fifth resistor is grounded, and the other end is electrically connected to the first dual tuner and dual demodulation circuit. One end of the sixth resistor is grounded, and the other end is electrically connected to the second dual tuner and dual demodulation circuit.

[0007] Further; the first dual tuner and dual demodulation circuit includes a first high-frequency head and demodulator, an eighth inductor, a ninth inductor, a tenth inductor, an eleventh inductor, a twelfth inductor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-fifth capacitor, a twenty-sixth capacitor, a twenty-seventh capacitor, a twenty-eighth capacitor, a twenty-ninth capacitor, a thirtieth capacitor, a thirty-first capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, and a... Resistors 13, 14, 15, 16, 17, 18, 19, and 20 are connected to the first crystal oscillator; the eighth inductor and the ninth capacitor are connected in series, one end of which is electrically connected to the first B pin of the first high-frequency head and demodulator, and the other end is electrically connected to the fifth resistor; the first A pin of the first high-frequency head and demodulator is grounded; the first C pin of the first high-frequency head and demodulator is grounded; the second B pin of the first high-frequency head and demodulator is electrically connected to the first C pin of the first high-frequency head and demodulator; one end of the tenth capacitor is electrically connected to the second D pin of the first high-frequency head and demodulator, and the other end is grounded; one end of the eleventh capacitor is connected to the first... The first E pin of the high-frequency head and demodulator is electrically connected, and the other end is grounded. The first E pin of the high-frequency head and demodulator is connected to a 1.8V power supply. One end of the twelfth capacitor is electrically connected to the first F pin of the high-frequency head and demodulator, and the other end is grounded. The first F pin of the high-frequency head and demodulator is connected to a 3.3V power supply. One end of the thirteenth capacitor is electrically connected to the second F pin of the high-frequency head and demodulator, and the other end is grounded. The first H pin of the high-frequency head and demodulator is grounded. The first H pin of the high-frequency head and demodulator is electrically connected to the third C pin of the high-frequency head and demodulator. One end of the fourteenth capacitor is grounded, and the other end is connected to the first high-frequency head... The second H pin of the demodulator is electrically connected; the seventh resistor and the fifteenth capacitor are connected in series, with one end grounded and the other end electrically connected to the third H pin of the first high-frequency head and demodulator; one end of the first crystal oscillator is electrically connected to the fourteenth capacitor and the other end is electrically connected to the seventh resistor; the third G pin of the first high-frequency head and demodulator is grounded; one end of the eighth resistor is electrically connected to the signal conversion circuit and the other end is electrically connected to the fourth H pin of the first high-frequency head and demodulator; the tenth H pin of the first high-frequency head and demodulator is electrically connected to the eighth resistor; the sixteenth capacitor and the ninth resistor are connected in parallel, with one end grounded and the other end electrically connected to the fifth H pin of the first high-frequency head and demodulator.One end of the tenth resistor is electrically connected to the seventh G pin of the first high-frequency head and demodulator, and the other end is electrically connected to the ninth resistor. One end of the eleventh resistor is connected to a 3.3V power supply, and the other end is electrically connected to the sixth H pin of the first high-frequency head and demodulator. One end of the twelfth resistor is electrically connected to the eleventh resistor, and the other end is electrically connected to the seventh G pin of the first high-frequency head and demodulator. One end of the seventeenth capacitor is grounded, and the other end is electrically connected to the twelfth resistor. The seventh E pin of the first high-frequency head and demodulator is grounded, and the seventh E pin of the first high-frequency head and demodulator is electrically connected to the seventh F pin of the first high-frequency head and demodulator. One end of the thirteenth resistor is grounded. The other end of the fourteenth resistor is electrically connected to the eighth G pin of the first high-frequency head and demodulator. One end of the fourteenth resistor is grounded, and the other end is electrically connected to the ninth G pin of the first high-frequency head and demodulator. One end of the eighteenth capacitor is grounded, and the other end is electrically connected to the ninth H pin of the first high-frequency head and demodulator. The ninth H pin of the first high-frequency head and demodulator is connected to a 3.3V power supply. One end of the nineteenth capacitor is grounded, and the other end is electrically connected to the tenth H pin of the first high-frequency head and demodulator. The tenth H pin of the first high-frequency head and demodulator is electrically connected to the eighth resistor. The tenth G pin and eleventh H pin of the first high-frequency head and demodulator are both electrically connected to the signal conversion circuit. One end of the twentieth capacitor is grounded, and the other end is electrically connected to the eleventh G pin of the first high-frequency head and demodulator. The twelfth H pin of the first high-frequency head and demodulator is electrically connected to the twelfth resistor. The thirteenth H pin of the first high-frequency head and demodulator is grounded. The thirteenth H pin of the first high-frequency head and demodulator is connected to the eighth C pin. One end of the fifteenth resistor is electrically connected to the thirteenth G pin of the first high-frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit. One end of the sixteenth resistor is electrically connected to the twelfth G pin of the first high-frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit. One end of the seventeenth resistor is electrically connected to the first high-frequency head and demodulator. The 13th F pin of the demodulator is electrically connected, and the other end is electrically connected to the signal conversion circuit; one end of the 21st capacitor is grounded, and the other end is electrically connected to the 13th E pin of the first high-frequency head and demodulator; one end of the 18th resistor is electrically connected to the 12th E pin of the first high-frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit; one end of the 22nd capacitor is grounded, and the other end is electrically connected to the 11th A pin of the first high-frequency head and demodulator; one end of the 23rd capacitor is grounded, and the other end is electrically connected to the 12th A pin of the first high-frequency head and demodulator; one end of the 24th capacitor is grounded, and the other end is electrically connected to the 11th A pin of the first high-frequency head and demodulator.One end of the 25th capacitor is grounded, and the other end is electrically connected to pin 10A of the first high-frequency head and demodulator. One end of the 26th capacitor is grounded, and the other end is electrically connected to pin 9B of the first high-frequency head and demodulator. One end of the 27th capacitor is electrically connected to the 26th capacitor, and the other end is electrically connected to pin 9A of the first high-frequency head and demodulator. One end of the 28th capacitor is electrically connected to the 27th capacitor, and the other end is electrically connected to pin 10B of the first high-frequency head and demodulator. One end of the 19th resistor is electrically connected to pin 8A of the first high-frequency head and demodulator, and the other end is electrically connected to the second dual tuner and dual demodulation circuit. One end of the 20th resistor is electrically connected to pin 8B of the first high-frequency head and demodulator, and the other end is electrically connected to the 19th resistor. One end of the 29th capacitor is connected to the first high-frequency head and demodulator. The seventh C pin of the capacitor is electrically connected, and the other end is electrically connected to the twentieth resistor. One end of the thirtieth capacitor is grounded, and the other end is electrically connected to the fifth A pin of the first high-frequency head and demodulator. One end of the thirty-first capacitor is grounded, and the other end is electrically connected to the second A pin of the first high-frequency head and demodulator. One end of the ninth inductor is electrically connected to the second A pin of the first high-frequency head and demodulator, and the other end is electrically connected to the third A pin of the first high-frequency head and demodulator. The third B pin of the first high-frequency head and demodulator is connected to the second A pin of the first high-frequency head and demodulator. One end of the tenth inductor is electrically connected to the fourth B pin of the first high-frequency head and demodulator, and the other end is electrically connected to the tenth inductor. One end of the twelfth inductor is electrically connected to the fourth A pin of the first high-frequency head and demodulator, and the other end is electrically connected to the fifth B pin of the first high-frequency head and demodulator.

[0008] Further; the second dual tuner and dual demodulation circuit includes a second high-frequency head and demodulator, a thirteenth inductor, a fourteenth inductor, a fifteenth inductor, a sixteenth inductor, a seventeenth inductor, a thirty-second capacitor, a thirty-third capacitor, a thirty-fourth capacitor, a thirty-fifth capacitor, a thirty-sixth capacitor, a thirty-seventh capacitor, a thirty-eighth capacitor, a thirty-ninth capacitor, a fortieth capacitor, a forty-first capacitor, a forty-second capacitor, a forty-third capacitor, a forty-fourth capacitor, a forty-fifth capacitor, a forty-sixth capacitor, a forty-seventh capacitor, a forty-eighth capacitor, a forty-ninth capacitor, a fiftieth capacitor, a fifty-first capacitor, a fifty-second capacitor, a fifty-third capacitor, a fifty-fourth capacitor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, and a... Resistors numbered 24, 25, 26, 27, 28, 29, 30, 31, 32, and 33; the 13th inductor and the 32nd capacitor are connected in series, with one end electrically connected to the first B pin of the second high-frequency head and demodulator, and the other end electrically connected to the sixth resistor; the first A pin of the second high-frequency head and demodulator is grounded; the first C pin of the second high-frequency head and demodulator is grounded; the second B pin of the second high-frequency head and demodulator is electrically connected to the first C pin of the second high-frequency head and demodulator; one end of the 33rd capacitor is electrically connected to the second D pin of the second high-frequency head and demodulator, and the other end is connected to... The thirty-fourth capacitor has one end electrically connected to the first E pin of the second high-frequency head and demodulator, and the other end grounded. The first E pin of the second high-frequency head and demodulator is connected to a 1.8V power supply voltage. The thirty-fifth capacitor has one end electrically connected to the first F pin of the second high-frequency head and demodulator, and the other end grounded. The first F pin of the second high-frequency head and demodulator is connected to a 3.3V power supply voltage. The thirty-sixth capacitor has one end electrically connected to the second F pin of the second high-frequency head and demodulator, and the other end grounded. The first H pin of the second high-frequency head and demodulator is grounded. The first H pin of the second high-frequency head and demodulator is electrically connected to the third C pin of the second high-frequency head and demodulator. The thirty-seventh capacitor has one end electrically connected to the second F pin of the second high-frequency head and demodulator, and the other end grounded. The thirty-seventh capacitor has one end electrically connected to the first E ... One end of the capacitor is electrically connected to the second H pin of the second high-frequency head and demodulator, and the other end is electrically connected to the twentieth resistor. One end of the twentieth eleventh resistor is grounded, and the other end is electrically connected to the third G pin of the second high-frequency head and demodulator. One end of the thirty-eighth capacitor is grounded, and the other end is electrically connected to the third H pin of the second high-frequency head and demodulator. One end of the twenty-second resistor is electrically connected to the signal conversion circuit, and the other end is electrically connected to the fourth H pin of the second high-frequency head and demodulator. The tenth H pin of the second high-frequency head and demodulator is electrically connected to the twenty-second resistor. The thirty-ninth capacitor and the twenty-third resistor are connected in parallel, with one end grounded and the other end electrically connected to the fifth H pin of the second high-frequency head and demodulator.One end of the 24th resistor is electrically connected to the 7th G pin of the second high-frequency head and demodulator, and the other end is electrically connected to the 24th resistor. One end of the 25th resistor is connected to a 3.3V power supply, and the other end is electrically connected to the 6th H pin of the second high-frequency head and demodulator. One end of the 26th resistor is electrically connected to the 25th resistor, and the other end is electrically connected to the 6th G pin of the second high-frequency head and demodulator. One end of the 40th capacitor is grounded, and the other end is electrically connected to the 26th resistor. The 7th E pin of the second high-frequency head and demodulator is grounded, and the 7th E pin of the second high-frequency head and demodulator is electrically connected to the 7th F pin of the second high-frequency head and demodulator. The 27th resistor... One end of the 28th resistor is grounded, and the other end is electrically connected to the eighth G pin of the second high-frequency head and demodulator. One end of the 28th resistor is grounded, and the other end is electrically connected to the ninth G pin of the second high-frequency head and demodulator. One end of the 41st capacitor is grounded, and the other end is electrically connected to the ninth H pin of the second high-frequency head and demodulator, which is connected to a 3.3V power supply. One end of the 42nd capacitor is grounded, and the other end is electrically connected to the tenth H pin of the second high-frequency head and demodulator, which is electrically connected to the 22nd resistor. The tenth G pin and eleventh H pin of the second high-frequency head and demodulator are both connected to the signal conversion capacitor. The circuit is electrically connected as follows: one end of the forty-third capacitor is grounded, and the other end is electrically connected to the eleventh G pin of the second high-frequency head and demodulator; the twelfth H pin of the second high-frequency head and demodulator is electrically connected to the twenty-sixth resistor; the thirteenth H pin of the second high-frequency head and demodulator is grounded; the thirteenth H pin of the second high-frequency head and demodulator is connected to the eighth C pin; one end of the twenty-ninth resistor is electrically connected to the thirteenth G pin of the second high-frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit; one end of the thirtieth resistor is electrically connected to the twelfth G pin of the second high-frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit; one end of the thirty-first resistor is electrically connected to the second high-frequency head and demodulator... The frequency head and demodulator's thirteenth F pin are electrically connected, and the other end is electrically connected to the signal conversion circuit; one end of the forty-fourth capacitor is grounded, and the other end is electrically connected to the thirteenth E pin of the second frequency head and demodulator; one end of the thirty-second resistor is electrically connected to the twelfth E pin of the second frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit; one end of the forty-fifth capacitor is grounded, and the other end is electrically connected to the eleventh A pin of the second frequency head and demodulator; one end of the forty-sixth capacitor is grounded, and the other end is electrically connected to the twelfth A pin of the second frequency head and demodulator; one end of the forty-seventh capacitor is grounded, and the other end is electrically connected to the eleventh A pin of the second frequency head and demodulator.One end of the forty-eighth capacitor is grounded, and the other end is electrically connected to pin 10A of the second high-frequency head and demodulator. One end of the forty-ninth capacitor is grounded, and the other end is electrically connected to pin 9B of the second high-frequency head and demodulator. One end of the fiftieth capacitor is electrically connected to the forty-ninth capacitor, and the other end is electrically connected to pin 9A of the second high-frequency head and demodulator. One end of the fifty-first capacitor is electrically connected to the fiftieth capacitor, and the other end is electrically connected to pin 10B of the second high-frequency head and demodulator. One end of the thirty-third resistor is electrically connected to pin 8B of the second high-frequency head and demodulator, and the other end is electrically connected to the fifty-second capacitor. One end of the fifty-second capacitor is electrically connected to pin 7C of the second high-frequency head and demodulator, and the other end is electrically connected to pin 8A of the second high-frequency head and demodulator. The fifty-third capacitor has one end grounded and the other end electrically connected to the fifth A pin of the second high-frequency head and demodulator. The fifty-fourth capacitor has one end grounded and the other end electrically connected to the second A pin of the second high-frequency head and demodulator. The fourteenth inductor has one end electrically connected to the second A pin of the second high-frequency head and demodulator and the other end electrically connected to the third A pin of the second high-frequency head and demodulator. The third B pin of the second high-frequency head and demodulator is connected to the second A pin of the second high-frequency head and demodulator. The fifteenth inductor has one end electrically connected to the fourth B pin of the second high-frequency head and demodulator and the other end electrically connected to the fifteenth inductor. The seventeenth inductor has one end electrically connected to the fourth A pin of the second high-frequency head and demodulator and the other end electrically connected to the fifth B pin of the second high-frequency head and demodulator.

[0009] Further, the signal conversion circuit includes a bridge for converting TS stream signals to USB signals, resistors 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, and 46, a second crystal oscillator, capacitors 55, 56, and 57, and a common-mode inductor for the winding; resistors 34, 35, and 36 are connected in series, one end of which is electrically connected to pin 56 of the bridge for converting TS stream signals to USB signals, and the other end is connected to pin 10G of the first high-frequency head and demodulator, and pin 2... The frequency head and demodulator's 10th G pin are electrically connected; the 37th and 38th resistors are connected in series, one end of which is electrically connected to the 35th resistor, and the other end is electrically connected to the 11th H pin of the first and second frequency heads and demodulators; one end of the 55th capacitor is grounded, and the other end is electrically connected to the 34th capacitor; one end of the 56th capacitor is grounded, and the other end is electrically connected to the 37th resistor; one end of the 57th capacitor is grounded, and the other end is electrically connected to the 10th pin of the bridge that converts the TS stream signal to a USB signal; the first pin of the second crystal oscillator is electrically connected to the 57th capacitor, and the second pin of the second crystal oscillator is grounded. The third pin is connected to the second pin of the second crystal oscillator, and the fourth pin of the second crystal oscillator is connected to the third pin of the second crystal oscillator; one end of the thirty-ninth resistor is electrically connected to the sixtieth pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the thirty-first resistor; one end of the fortieth resistor is electrically connected to the sixty-second pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the thirty-tenth resistor; one end of the forty-first resistor is electrically connected to the sixty-first pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the twenty-ninth resistor; one end of the forty-second resistor is connected to the bridge that converts TS stream signals to USB signals. The 59th pin is electrically connected, and the other end is electrically connected to the 32nd resistor; one end of the 43rd resistor is electrically connected to the 3rd pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the 17th resistor; one end of the 44th resistor is electrically connected to the 5th pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the 16th resistor; one end of the 45th resistor is electrically connected to the 4th pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the 15th resistor; one end of the 46th resistor is electrically connected to the 2nd pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the 18th resistor.The fourth pin of the common-mode inductor is electrically connected to the thirty-ninth pin of the bridge that converts the TS stream signal to a USB signal; the third pin of the common-mode inductor is electrically connected to the USB hub circuit; the first pin of the common-mode inductor is electrically connected to the thirty-eighth pin of the bridge that converts the TS stream signal to a USB signal; and the second pin of the common-mode inductor is electrically connected to the USB hub circuit.

[0010] Further; the USB HUB circuit includes a hub controller chip, capacitors 58, 59, 60, and 61, resistors 47, 48, 49, 50, 51, 52, 53, 54, 55, and 56, and a third crystal oscillator; one end of the 47th resistor is grounded, and the other end is electrically connected to pin 16 of the hub controller chip; one end of the 58th capacitor is grounded, and the other end is electrically connected to pin 17 of the hub controller chip; one end of the 48th resistor is electrically connected to pin 22 of the hub controller chip, and the other... One end of the capacitor is connected to a 3.3V power supply; one end of the forty-ninth resistor is grounded, and the other end is electrically connected to the twenty-third pin of the hub controller chip; one end of the fiftieth resistor is electrically connected to the forty-ninth resistor, and the other end is connected to a 3.3V power supply; one end of the fifty-first resistor is grounded, and the other end is electrically connected to the twenty-fourth pin of the hub controller chip; one end of the fifty-ninth capacitor is grounded, and the other end is electrically connected to the fiftieth resistor; one end of the fifty-second resistor is grounded, and the other end is electrically connected to the twenty-fifth pin of the hub controller chip; one end of the fifty-third resistor is electrically connected to the fifty-second resistor, and the other end is connected to the USB... The TYPE-C interface is electrically connected; one end of the 54th resistor is electrically connected to the 32nd pin of the hub controller chip, and the other end is connected to a 3.3V power supply; one end of the 55th resistor is electrically connected to the 44th pin of the hub controller chip, and the other end is electrically connected to the 45th pin of the hub controller chip; one end of the 60th capacitor is grounded, and the other end is electrically connected to the 56th resistor; one end of the 61st capacitor is grounded, and the other end is electrically connected to the 56th resistor; the third crystal oscillator is electrically connected between the 60th capacitor and the 61st capacitor; pins 56, 57, 59, and 60 of the hub controller chip are all electrically connected to the SD card / TF card recording circuit; pins 36, 37, 38, 39, 41, and 42 of the hub controller chip are all electrically connected to the USB TYPE-C interface.

[0011] The beneficial effects of this utility model are: This invention provides a dual-tuner USB TV stick circuit. Through the design of a first and second dual-tuner and a dual-demodulation circuit, it achieves parallel frequency selection, amplification, and demodulation of two terrestrial digital television signals. This allows users to watch two programs simultaneously or record another program while watching the first, overcoming the functional limitations of single-tuner devices and greatly improving the flexibility and diversity of program reception. The low-noise amplifier (LNA) in the signal amplification circuit reduces noise and amplifies the signal received by the antenna, ensuring signal quality. The signal conversion circuit converts the TS stream signal into a USB signal, which is then separated and transmitted via the USB hub circuit, ensuring stable signal flow within the device, reducing signal loss and interference, and providing a high-quality signal source for subsequent playback and recording. The SD / TF card recording circuit, in conjunction with the USB hub circuit, enables local storage of program streams. Users do not need to rely on the main device's memory space and can manage recorded content independently. Simultaneously, by connecting to the main device via the USB Type-C interface and using a compatible app, it enables multi-program picture-in-picture playback, SD / TF card operation, and other functions, expanding the device's application scenarios and user experience. Attached Figure Description Figure 1 This is a schematic diagram of a dual-tuner USB TV stick circuit according to this utility model. Figure 2 This is a circuit diagram of the signal amplification circuit in a dual-tuner USB TV stick circuit of this utility model; Figure 3 This is a circuit diagram of the first dual tuner and dual demodulation circuit in a dual tuner USB TV stick circuit of this utility model. Figure 4 This is a circuit diagram of the second dual tuner and dual demodulation circuit in a dual tuner USB TV stick circuit of this utility model. Figure 5 This is a circuit diagram of the signal conversion circuit in a dual-tuner USB TV stick circuit of this utility model; Figure 6 This is a circuit diagram of the USB HUB circuit in a dual-tuner USB TV stick circuit of this utility model.

[0012] Figure 7 This is a circuit diagram of the SD / TF card burning circuit in a dual-tuner USB TV stick circuit of this utility model.

[0013] Figure 8 This is a circuit diagram of the USB TYPE-C interface in a dual-tuner USB TV stick circuit of this utility model. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0016] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0017] This utility model proposes a dual-tuner USB TV stick circuit.

[0018] In the embodiments of this utility model, such as Figure 1-8 As shown, this is a dual-tuner USB TV stick circuit. The dual-tuner USB TV stick circuit includes an antenna interface, a USB Type-C interface, a host device, a signal amplification circuit, an SD / TF card burning circuit, a USB hub circuit, a first dual-tuner and dual-demodulation circuit, a second dual-tuner and dual-demodulation circuit, and a signal conversion circuit for converting TS stream signals into USB signals. An RF antenna is soldered onto the antenna interface. The input terminal of the signal amplification circuit is electrically connected to the antenna interface. The signal amplification circuit is bidirectionally communicatively connected to the first dual-tuner and dual-demodulation circuit and the second dual-tuner and dual-demodulation circuit. The first dual-tuner and dual-demodulation circuit and the second dual-tuner and dual-demodulation circuit are both bidirectionally communicatively connected to the signal conversion circuit. The signal conversion circuit is bidirectionally communicatively connected to the USB hub circuit. The USB hub circuit is bidirectionally communicatively connected to the SD / TF card burning circuit, and an SD / TF card is installed on the SD / TF card burning circuit. The output terminal of the USB Type-C interface is communicatively connected to the host device.

[0019] In this embodiment, the signal amplification circuit includes a bidirectional high-speed switching diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor, a seventh inductor, a low-noise amplifier, and a transformer. The first capacitor, second capacitor, first inductor, third capacitor, and second inductor are connected in series, with one end grounded and the other end electrically connected to the antenna interface. The bidirectional high-speed switching diode is electrically connected to the common terminal of the first and second capacitors. The third and fourth inductors are connected in series, with one end electrically connected to the first inductor and the other end electrically connected to the sixth pin of the low-noise amplifier, which is grounded. The fourth capacitor, fifth inductor, first resistor, and sixth inductor are connected in series, with one end grounded and the other end electrically connected to the first pin of the low-noise amplifier. One end of the fifth capacitor is grounded and the other end is electrically connected to the fifth inductor. The low-noise amplifier's second pin is electrically connected to the fifth capacitor; one end of the sixth capacitor is grounded, and the other end is electrically connected to the fourth pin of the low-noise amplifier; one end of the second resistor is electrically connected to the sixth capacitor, and the other end is connected to a power supply circuit; the seventh capacitor and the third resistor are connected in series, one end of which is electrically connected to the first pin of the low-noise amplifier, and the other end is electrically connected to the third pin of the transformer; the fourth pin of the transformer is electrically connected to the second resistor; one end of the eighth capacitor is grounded, and the other end is electrically connected to the fourth pin of the transformer; the third resistor and the seventh inductor are connected in series, one end of which is electrically connected to the third pin of the transformer, and the other end is electrically connected to the first pin of the transformer; the third pin of the transformer is electrically connected to the first dual tuner and dual demodulation circuit; the first pin of the transformer is electrically connected to the second dual tuner and dual demodulation circuit; one end of the fifth resistor is grounded, and the other end is electrically connected to the first dual tuner and dual demodulation circuit; one end of the sixth resistor is grounded, and the other end is electrically connected to the second dual tuner and dual demodulation circuit.

[0020] In this embodiment, the first dual tuner and dual demodulation circuit includes a first high-frequency head and a demodulator, an eighth inductor, a ninth inductor, a tenth inductor, an eleventh inductor, a twelfth inductor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-fifth capacitor, a twenty-sixth capacitor, a twenty-seventh capacitor, a twenty-eighth capacitor, a twenty-ninth capacitor, a thirtieth capacitor, a thirty-first capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, and a twelfth resistor. The thirteenth, fourteenth, fifteenth, sixteenth, seventeenth, eighteenth, nineteenth, and twentieth resistors are connected to the first crystal oscillator; the eighth inductor and the ninth capacitor are connected in series, with one end electrically connected to the first B pin of the first high-frequency head and demodulator, and the other end electrically connected to the fifth resistor; the first A pin of the first high-frequency head and demodulator is grounded; the first C pin of the first high-frequency head and demodulator is grounded; the second B pin of the first high-frequency head and demodulator is electrically connected to the first C pin of the first high-frequency head and demodulator; one end of the tenth capacitor is electrically connected to the second D pin of the first high-frequency head and demodulator, and the other end is grounded; one end of the eleventh capacitor is connected to the first... A high-frequency head and demodulator have their first E pin electrically connected and their other end grounded. The first E pin of the high-frequency head and demodulator is connected to a 1.8V power supply. One end of the twelfth capacitor is electrically connected to the first F pin of the high-frequency head and demodulator, and its other end is grounded. The first F pin of the high-frequency head and demodulator is connected to a 3.3V power supply. One end of the thirteenth capacitor is electrically connected to the second F pin of the high-frequency head and demodulator, and its other end is grounded. The first H pin of the high-frequency head and demodulator is grounded, and its first H pin is electrically connected to its third C pin. One end of the fourteenth capacitor is grounded, and its other end is connected to the first high-frequency head and demodulator. The first high-frequency head and demodulator are electrically connected to the second H pin. The seventh resistor and the fifteenth capacitor are connected in series, with one end grounded and the other end electrically connected to the third H pin of the first high-frequency head and demodulator. One end of the first crystal oscillator is electrically connected to the fourteenth capacitor and the other end is electrically connected to the seventh resistor. The third G pin of the first high-frequency head and demodulator is grounded. One end of the eighth resistor is electrically connected to the signal conversion circuit and the other end is electrically connected to the fourth H pin of the first high-frequency head and demodulator. The tenth H pin of the first high-frequency head and demodulator is electrically connected to the eighth resistor. The sixteenth capacitor and the ninth resistor are connected in parallel, with one end grounded and the other end electrically connected to the fifth H pin of the first high-frequency head and demodulator.One end of the tenth resistor is electrically connected to the seventh G pin of the first high-frequency head and demodulator, and the other end is electrically connected to the ninth resistor. One end of the eleventh resistor is connected to a 3.3V power supply, and the other end is electrically connected to the sixth H pin of the first high-frequency head and demodulator. One end of the twelfth resistor is electrically connected to the eleventh resistor, and the other end is electrically connected to the seventh G pin of the first high-frequency head and demodulator. One end of the seventeenth capacitor is grounded, and the other end is electrically connected to the twelfth resistor. The seventh E pin of the first high-frequency head and demodulator is grounded, and the seventh E pin of the first high-frequency head and demodulator is electrically connected to the seventh F pin of the first high-frequency head and demodulator. One end of the thirteenth resistor is grounded. The other end of the fourteenth resistor is electrically connected to the eighth G pin of the first high-frequency head and demodulator. One end of the fourteenth resistor is grounded, and the other end is electrically connected to the ninth G pin of the first high-frequency head and demodulator. One end of the eighteenth capacitor is grounded, and the other end is electrically connected to the ninth H pin of the first high-frequency head and demodulator. The ninth H pin of the first high-frequency head and demodulator is connected to a 3.3V power supply. One end of the nineteenth capacitor is grounded, and the other end is electrically connected to the tenth H pin of the first high-frequency head and demodulator. The tenth H pin of the first high-frequency head and demodulator is electrically connected to the eighth resistor. The tenth G pin and eleventh H pin of the first high-frequency head and demodulator are both electrically connected to the signal conversion circuit. One end of the twentieth capacitor is grounded, and the other end is electrically connected to the eleventh G pin of the first high-frequency head and demodulator. The twelfth H pin of the first high-frequency head and demodulator is electrically connected to the twelfth resistor. The thirteenth H pin of the first high-frequency head and demodulator is grounded. The thirteenth H pin of the first high-frequency head and demodulator is connected to the eighth C pin. One end of the fifteenth resistor is electrically connected to the thirteenth G pin of the first high-frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit. One end of the sixteenth resistor is electrically connected to the twelfth G pin of the first high-frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit. One end of the seventeenth resistor is electrically connected to the first high-frequency head and demodulator. The 13th F pin of the demodulator is electrically connected, and the other end is electrically connected to the signal conversion circuit; one end of the 21st capacitor is grounded, and the other end is electrically connected to the 13th E pin of the first high-frequency head and demodulator; one end of the 18th resistor is electrically connected to the 12th E pin of the first high-frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit; one end of the 22nd capacitor is grounded, and the other end is electrically connected to the 11th A pin of the first high-frequency head and demodulator; one end of the 23rd capacitor is grounded, and the other end is electrically connected to the 12th A pin of the first high-frequency head and demodulator; one end of the 24th capacitor is grounded, and the other end is electrically connected to the 11th A pin of the first high-frequency head and demodulator.One end of the 25th capacitor is grounded, and the other end is electrically connected to pin 10A of the first high-frequency head and demodulator. One end of the 26th capacitor is grounded, and the other end is electrically connected to pin 9B of the first high-frequency head and demodulator. One end of the 27th capacitor is electrically connected to the 26th capacitor, and the other end is electrically connected to pin 9A of the first high-frequency head and demodulator. One end of the 28th capacitor is electrically connected to the 27th capacitor, and the other end is electrically connected to pin 10B of the first high-frequency head and demodulator. One end of the 19th resistor is electrically connected to pin 8A of the first high-frequency head and demodulator, and the other end is electrically connected to the second dual tuner and dual demodulation circuit. One end of the 20th resistor is electrically connected to pin 8B of the first high-frequency head and demodulator, and the other end is electrically connected to the 19th resistor. One end of the 29th capacitor is connected to the first high-frequency head and demodulator. The seventh C pin of the capacitor is electrically connected, and the other end is electrically connected to the twentieth resistor. One end of the thirtieth capacitor is grounded, and the other end is electrically connected to the fifth A pin of the first high-frequency head and demodulator. One end of the thirty-first capacitor is grounded, and the other end is electrically connected to the second A pin of the first high-frequency head and demodulator. One end of the ninth inductor is electrically connected to the second A pin of the first high-frequency head and demodulator, and the other end is electrically connected to the third A pin of the first high-frequency head and demodulator. The third B pin of the first high-frequency head and demodulator is connected to the second A pin of the first high-frequency head and demodulator. One end of the tenth inductor is electrically connected to the fourth B pin of the first high-frequency head and demodulator, and the other end is electrically connected to the tenth inductor. One end of the twelfth inductor is electrically connected to the fourth A pin of the first high-frequency head and demodulator, and the other end is electrically connected to the fifth B pin of the first high-frequency head and demodulator.

[0021] In this embodiment, the second dual tuner and dual demodulation circuit includes a second high-frequency head and a demodulator, a thirteenth inductor, a fourteenth inductor, a fifteenth inductor, a sixteenth inductor, a seventeenth inductor, a thirty-second capacitor, a thirty-third capacitor, a thirty-fourth capacitor, a thirty-fifth capacitor, a thirty-sixth capacitor, a thirty-seventh capacitor, a thirty-eighth capacitor, a thirty-ninth capacitor, a fortieth capacitor, a forty-first capacitor, a forty-second capacitor, a forty-third capacitor, a forty-fourth capacitor, a forty-fifth capacitor, a forty-sixth capacitor, a forty-seventh capacitor, a forty-eighth capacitor, a forty-ninth capacitor, a fiftieth capacitor, a fifty-first capacitor, a fifty-second capacitor, a fifty-third capacitor, a fifty-fourth capacitor, a twenty-first resistor, a twenty-second resistor, and a twenty-third resistor. The resistors are: the 24th, 25th, 26th, 27th, 28th, 29th, 30th, 31st, 32nd, and 33rd resistors; the 13th inductor and the 32nd capacitor are connected in series, with one end electrically connected to the first B pin of the second high-frequency head and demodulator, and the other end electrically connected to the 6th resistor; the first A pin of the second high-frequency head and demodulator is grounded; the first C pin of the second high-frequency head and demodulator is grounded; the second B pin of the second high-frequency head and demodulator is electrically connected to the first C pin of the second high-frequency head and demodulator; one end of the 33rd capacitor is electrically connected to the second D pin of the second high-frequency head and demodulator, and the other end... Grounded; one end of the thirty-fourth capacitor is electrically connected to the first E pin of the second high-frequency head and demodulator, and the other end is grounded. The first E pin of the second high-frequency head and demodulator is connected to a 1.8V power supply voltage. One end of the thirty-fifth capacitor is electrically connected to the first F pin of the second high-frequency head and demodulator, and the other end is grounded. The first F pin of the second high-frequency head and demodulator is connected to a 3.3V power supply voltage. One end of the thirty-sixth capacitor is electrically connected to the second F pin of the second high-frequency head and demodulator, and the other end is grounded. The first H pin of the second high-frequency head and demodulator is grounded. The first H pin of the second high-frequency head and demodulator is electrically connected to the third C pin of the second high-frequency head and demodulator. The thirty-seventh capacitor... One end of the capacitor is electrically connected to the second H pin of the second high-frequency head and demodulator, and the other end is electrically connected to the twentieth resistor. One end of the twentieth eleventh resistor is grounded, and the other end is electrically connected to the third G pin of the second high-frequency head and demodulator. One end of the thirty-eighth capacitor is grounded, and the other end is electrically connected to the third H pin of the second high-frequency head and demodulator. One end of the twenty-second resistor is electrically connected to the signal conversion circuit, and the other end is electrically connected to the fourth H pin of the second high-frequency head and demodulator. The tenth H pin of the second high-frequency head and demodulator is electrically connected to the twenty-second resistor. The thirty-ninth capacitor and the twenty-third resistor are connected in parallel, with one end grounded and the other end electrically connected to the fifth H pin of the second high-frequency head and demodulator.One end of the 24th resistor is electrically connected to the 7th G pin of the second high-frequency head and demodulator, and the other end is electrically connected to the 24th resistor. One end of the 25th resistor is connected to a 3.3V power supply, and the other end is electrically connected to the 6th H pin of the second high-frequency head and demodulator. One end of the 26th resistor is electrically connected to the 25th resistor, and the other end is electrically connected to the 6th G pin of the second high-frequency head and demodulator. One end of the 40th capacitor is grounded, and the other end is electrically connected to the 26th resistor. The 7th E pin of the second high-frequency head and demodulator is grounded, and the 7th E pin of the second high-frequency head and demodulator is electrically connected to the 7th F pin of the second high-frequency head and demodulator. The 27th resistor... One end of the 28th resistor is grounded, and the other end is electrically connected to the eighth G pin of the second high-frequency head and demodulator. One end of the 28th resistor is grounded, and the other end is electrically connected to the ninth G pin of the second high-frequency head and demodulator. One end of the 41st capacitor is grounded, and the other end is electrically connected to the ninth H pin of the second high-frequency head and demodulator, which is connected to a 3.3V power supply. One end of the 42nd capacitor is grounded, and the other end is electrically connected to the tenth H pin of the second high-frequency head and demodulator, which is electrically connected to the 22nd resistor. The tenth G pin and eleventh H pin of the second high-frequency head and demodulator are both connected to the signal conversion capacitor. The circuit is electrically connected as follows: one end of the forty-third capacitor is grounded, and the other end is electrically connected to the eleventh G pin of the second high-frequency head and demodulator; the twelfth H pin of the second high-frequency head and demodulator is electrically connected to the twenty-sixth resistor; the thirteenth H pin of the second high-frequency head and demodulator is grounded; the thirteenth H pin of the second high-frequency head and demodulator is connected to the eighth C pin; one end of the twenty-ninth resistor is electrically connected to the thirteenth G pin of the second high-frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit; one end of the thirtieth resistor is electrically connected to the twelfth G pin of the second high-frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit; one end of the thirty-first resistor is electrically connected to the second high-frequency head and demodulator... The frequency head and demodulator's thirteenth F pin are electrically connected, and the other end is electrically connected to the signal conversion circuit; one end of the forty-fourth capacitor is grounded, and the other end is electrically connected to the thirteenth E pin of the second frequency head and demodulator; one end of the thirty-second resistor is electrically connected to the twelfth E pin of the second frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit; one end of the forty-fifth capacitor is grounded, and the other end is electrically connected to the eleventh A pin of the second frequency head and demodulator; one end of the forty-sixth capacitor is grounded, and the other end is electrically connected to the twelfth A pin of the second frequency head and demodulator; one end of the forty-seventh capacitor is grounded, and the other end is electrically connected to the eleventh A pin of the second frequency head and demodulator.One end of the forty-eighth capacitor is grounded, and the other end is electrically connected to pin 10A of the second high-frequency head and demodulator. One end of the forty-ninth capacitor is grounded, and the other end is electrically connected to pin 9B of the second high-frequency head and demodulator. One end of the fiftieth capacitor is electrically connected to the forty-ninth capacitor, and the other end is electrically connected to pin 9A of the second high-frequency head and demodulator. One end of the fifty-first capacitor is electrically connected to the fiftieth capacitor, and the other end is electrically connected to pin 10B of the second high-frequency head and demodulator. One end of the thirty-third resistor is electrically connected to pin 8B of the second high-frequency head and demodulator, and the other end is electrically connected to the fifty-second capacitor. One end of the fifty-second capacitor is electrically connected to pin 7C of the second high-frequency head and demodulator, and the other end is electrically connected to pin 8A of the second high-frequency head and demodulator. The fifty-third capacitor has one end grounded and the other end electrically connected to the fifth A pin of the second high-frequency head and demodulator. The fifty-fourth capacitor has one end grounded and the other end electrically connected to the second A pin of the second high-frequency head and demodulator. The fourteenth inductor has one end electrically connected to the second A pin of the second high-frequency head and demodulator and the other end electrically connected to the third A pin of the second high-frequency head and demodulator. The third B pin of the second high-frequency head and demodulator is connected to the second A pin of the second high-frequency head and demodulator. The fifteenth inductor has one end electrically connected to the fourth B pin of the second high-frequency head and demodulator and the other end electrically connected to the fifteenth inductor. The seventeenth inductor has one end electrically connected to the fourth A pin of the second high-frequency head and demodulator and the other end electrically connected to the fifth B pin of the second high-frequency head and demodulator.

[0022] In this embodiment, the signal conversion circuit includes a bridge for converting TS stream signals to USB signals, resistors 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, and 46, a second crystal oscillator, capacitors 55, 56, and 57, and a common-mode inductor for windings. Resistors 34, 35, and 36 are connected in series, with one end electrically connected to pin 56 of the bridge for converting TS stream signals to USB signals, and the other end connected to pin 10G of the first high-frequency head and demodulator, and pin 2... The high-frequency head and demodulator's 10th G pin are electrically connected; the 37th and 38th resistors are connected in series, one end of which is electrically connected to the 35th resistor, and the other end is electrically connected to the 11th H pin of the first and second high-frequency heads and demodulators; one end of the 55th capacitor is grounded, and the other end is electrically connected to the 34th capacitor; one end of the 56th capacitor is grounded, and the other end is electrically connected to the 37th resistor; one end of the 57th capacitor is grounded, and the other end is electrically connected to the 10th pin of the bridge that converts the TS stream signal to a USB signal; the first pin of the second crystal oscillator is electrically connected to the 57th capacitor, and the second pin of the second crystal oscillator is grounded. The third pin is connected to the second pin of the second crystal oscillator, and the fourth pin of the second crystal oscillator is connected to the third pin of the second crystal oscillator; one end of the thirty-ninth resistor is electrically connected to the sixtieth pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the thirty-first resistor; one end of the fortieth resistor is electrically connected to the sixty-second pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the thirty-tenth resistor; one end of the forty-first resistor is electrically connected to the sixty-first pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the twenty-ninth resistor; one end of the forty-second resistor is electrically connected to the bridge that converts TS stream signals to USB signals. The 59th pin of the resistor is electrically connected, and the other end is electrically connected to the 32nd resistor; one end of the 43rd resistor is electrically connected to the 3rd pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the 17th resistor; one end of the 44th resistor is electrically connected to the 5th pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the 16th resistor; one end of the 45th resistor is electrically connected to the 4th pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the 15th resistor; one end of the 46th resistor is electrically connected to the 2nd pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the 18th resistor.The fourth pin of the common-mode inductor is electrically connected to the thirty-ninth pin of the bridge that converts the TS stream signal to a USB signal; the third pin of the common-mode inductor is electrically connected to the USB hub circuit; the first pin of the common-mode inductor is electrically connected to the thirty-eighth pin of the bridge that converts the TS stream signal to a USB signal; and the second pin of the common-mode inductor is electrically connected to the USB hub circuit.

[0023] In this embodiment, the USB HUB circuit includes a hub controller chip, capacitors 58, 59, 60, and 61, resistors 47, 48, 49, 50, 51, 52, 53, 54, 55, and 56, and a third crystal oscillator; one end of the 47th resistor is grounded, and the other end is electrically connected to pin 16 of the hub controller chip; one end of the 58th capacitor is grounded, and the other end is electrically connected to pin 17 of the hub controller chip; one end of the 48th resistor is electrically connected to pin 22 of the hub controller chip; and the other... One end of the capacitor is connected to a 3.3V power supply; one end of the forty-ninth resistor is grounded, and the other end is electrically connected to the twenty-third pin of the hub controller chip; one end of the fiftieth resistor is electrically connected to the forty-ninth resistor, and the other end is connected to a 3.3V power supply; one end of the fifty-first resistor is grounded, and the other end is electrically connected to the twenty-fourth pin of the hub controller chip; one end of the fifty-ninth capacitor is grounded, and the other end is electrically connected to the fiftieth resistor; one end of the fifty-second resistor is grounded, and the other end is electrically connected to the twenty-fifth pin of the hub controller chip; one end of the fifty-third resistor is electrically connected to the fifty-second resistor, and the other end is connected to the USB... The TYPE-C interface is electrically connected; one end of the 54th resistor is electrically connected to the 32nd pin of the hub controller chip, and the other end is connected to a 3.3V power supply; one end of the 55th resistor is electrically connected to the 44th pin of the hub controller chip, and the other end is electrically connected to the 45th pin of the hub controller chip; one end of the 60th capacitor is grounded, and the other end is electrically connected to the 56th resistor; one end of the 61st capacitor is grounded, and the other end is electrically connected to the 56th resistor; the third crystal oscillator is electrically connected between the 60th capacitor and the 61st capacitor; pins 56, 57, 59, and 60 of the hub controller chip are all electrically connected to the SD card / TF card recording circuit; pins 36, 37, 38, 39, 41, and 42 of the hub controller chip are all electrically connected to the USB TYPE-C interface.

[0024] In practical applications, a USB TV stick is a slave device that communicates with a host device (such as a computer, network media player, or mobile phone) via a USB Type-C interface. To receive and play terrestrial digital television signals, users need to install a companion application (APP) on the host device to adapt to different operating systems. Through this application, users can control functions such as playing TV programs, picture-in-picture switching, and local recording to SD / TF cards.

[0025] Terrestrial digital television signals mainly include various standards such as ATSC, DVB-T / T2, and DTMB. The signal reception and processing flow is as follows: The terrestrial broadcast digital television signal is first received by an external RF antenna and then transmitted to the circuit system through the antenna interface. The received RF signal is amplified and noise-reduced by a low-noise amplifier (LNA) to improve signal quality. The processed RF signal is then sent to the first and second dual tuners and dual demodulation circuits, respectively.

[0026] The first and second dual tuners and dual demodulation circuits select and amplify the two high-frequency signals respectively, and output the corresponding intermediate frequency signals TUNER0 and TUNER1. Subsequently, the intermediate frequency signals output by TUNER0 and TUNER1 are demodulated by DEMOD0 and DEMOD1 respectively to generate their respective TS stream (Transport Stream) signals.

[0027] After demodulation, the TS stream signal enters the signal conversion circuit and is converted into a USB format signal. This USB signal is then separated into two independent USB data streams by a USB hub circuit. One USB signal is sent to the SD / TF card burning circuit for local storage of the program stream; the other USB signal is output to the USB Type-C interface. This USB Type-C interface connects to the host device. Users can control the TV stick and set parameters via an app on the host device. The program signal received by the TV stick is demultiplexed and decoded by the host device's CPU, ultimately outputting audio and video signals for TV program playback. Furthermore, users can also perform multi-program picture-in-picture playback, as well as burning and playing data from the SD / TF card via the app.

[0028] After the television program signal is transmitted from the slave device to the master device, the master device's CPU performs demultiplexing and decoding of the video stream, ultimately outputting audio and video signals to enable television program viewing. Simultaneously, users can utilize the application to achieve diverse functions such as multi-program picture-in-picture playback, SD / TF card recording and playback.

[0029] This design fully leverages the advantages of a dual-tuner architecture, supporting simultaneous reception of programs from two different channels and enabling advanced features such as simultaneous viewing and recording, and cross-frequency recording, significantly enhancing the user experience.

[0030] Specifically, this application implements a high-performance USB TV stick solution by designing and integrating a first dual tuner and dual demodulation circuit and a second dual tuner and dual demodulation circuit (Dual Tuner + Dual Demod). The solution employs two completely independent tuners and demodulators in its hardware architecture, enabling users to simultaneously receive and play two different TV programs, or record one program while watching another, thus achieving cross-frequency recording functionality and ensuring users don't miss any exciting content.

[0031] This device is not only suitable for use in fixed locations, but also supports watching television programs in mobile environments (such as when traveling by car or high-speed rail). However, most similar products on the market currently suffer from unstable signals and frequent interruptions in high-speed mobile scenarios, which seriously affects the user's viewing experience.

[0032] To effectively address the aforementioned issues, this application incorporates a low-noise amplifier (LNA) circuit in the radio frequency front-end, significantly improving the sensitivity and stability of signal reception. This improvement enables users to stably receive high-definition terrestrial digital television signals even during high-speed movement, enjoying a clear, smooth, and uninterrupted viewing experience.

[0033] To control costs and improve device compatibility, this USB TV stick does not have a built-in independent CPU and video decoding module. Instead, it functions as a slave device, connecting to a host device such as a computer, TV, or mobile phone via a USB Type-C interface, and requires a corresponding application (APP) to function. Typically, program recording data is stored directly on the host device, which can easily lead to excessive storage space consumption on the host device and negatively impact the user experience.

[0034] To this end, this application innovatively adds SD / TF card recording and storage functions. Users can directly record and save their favorite programs to SD or TF cards without relying on the local storage space of the main device, which saves the main device resources and facilitates playback at any time, greatly improving the convenience and flexibility of use.

[0035] In summary, this application incorporates several innovative designs in areas such as improving signal reception capabilities, enhancing mobility adaptability, and optimizing storage methods. These designs effectively address key pain points of existing products, significantly improve user experience, and demonstrate promising application prospects and market promotion value.

[0036] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A dual-tuner USB TV stick circuit, characterized in that, The dual-tuner USB TV stick circuit includes an antenna interface, a USB TYPE-C interface, a host device, a signal amplification circuit, an SD / TF card burning circuit, a USB hub circuit, a first dual tuner and dual demodulation circuit, a second dual tuner and dual demodulation circuit, and a signal conversion circuit for converting TS stream signals into USB signals. An RF antenna is soldered onto the antenna interface. The input terminal of the signal amplification circuit is electrically connected to the antenna interface. The signal amplification circuit is bidirectionally communicatively connected to the first dual tuner and dual demodulation circuit and the second dual tuner and dual demodulation circuit. The first dual tuner and dual demodulation circuit and the second dual tuner and dual demodulation circuit are both bidirectionally communicatively connected to the signal conversion circuit. The signal conversion circuit is bidirectionally communicatively connected to the USB hub circuit. The USB hub circuit is bidirectionally communicatively connected to the SD / TF card burning circuit, and an SD / TF card is installed on the SD / TF card burning circuit. The output terminal of the USB TYPE-C interface is communicatively connected to the host device.

2. The dual-tuner USB TV stick circuit as described in claim 1, characterized in that, The signal amplification circuit includes a bidirectional high-speed switching diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first inductor, a second inductor, a third inductor, a fourth inductor, a fifth inductor, a sixth inductor, a seventh inductor, a low-noise amplifier, and a transformer. The first capacitor, second capacitor, first inductor, third capacitor, and second inductor are connected in series, with one end grounded and the other end electrically connected to the antenna interface. The bidirectional high-speed switching diode is electrically connected to the common terminal of the first and second capacitors. The third and fourth inductors are connected in series, with one end electrically connected to the first inductor and the other end electrically connected to the sixth pin of the low-noise amplifier, which is grounded. The fourth capacitor, fifth inductor, first resistor, and sixth inductor are connected in series, with one end grounded and the other end electrically connected to the first pin of the low-noise amplifier. One end of the fifth capacitor is grounded, and the other end is electrically connected to the fifth inductor. The second pin of the low-noise amplifier is electrically connected to the fifth capacitor. One end of the sixth capacitor is grounded, and the other end is electrically connected to the fourth pin of the low-noise amplifier. One end of the second resistor is electrically connected to the sixth capacitor, and the other end is connected to a power supply circuit. The seventh capacitor and the third resistor are connected in series, with one end electrically connected to the first pin of the low-noise amplifier and the other end electrically connected to the third pin of the transformer. The fourth pin of the transformer is electrically connected to the second resistor. One end of the eighth capacitor is grounded, and the other end is electrically connected to the fourth pin of the transformer. The third resistor and the seventh inductor are connected in series, with one end electrically connected to the third pin of the transformer and the other end electrically connected to the first pin of the transformer. The third pin of the transformer is electrically connected to the first dual tuner and dual demodulation circuit. The first pin of the transformer is electrically connected to the second dual tuner and dual demodulation circuit. One end of the fifth resistor is grounded, and the other end is electrically connected to the first dual tuner and dual demodulation circuit. One end of the sixth resistor is grounded, and the other end is electrically connected to the second dual tuner and dual demodulation circuit.

3. The dual-tuner USB TV stick circuit as described in claim 2, characterized in that, The first dual tuner and dual demodulation circuit includes a first high-frequency head and demodulator, an eighth inductor, a ninth inductor, a tenth inductor, an eleventh inductor, a twelfth inductor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a sixteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-fifth capacitor, a twenty-sixth capacitor, a twenty-seventh capacitor, a twenty-eighth capacitor, a twenty-ninth capacitor, a thirtieth capacitor, a thirty-first capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, and a first crystal oscillator; The eighth inductor and the ninth capacitor are connected in series, with one end electrically connected to the first B pin of the first high-frequency head and demodulator, and the other end electrically connected to the fifth resistor. The first A pin of the first high-frequency head and demodulator is grounded; the first C pin of the first high-frequency head and demodulator is grounded; the second B pin of the first high-frequency head and demodulator is electrically connected to the first C pin of the first high-frequency head and demodulator; one end of the tenth capacitor is electrically connected to the second D pin of the first high-frequency head and demodulator, and the other end is grounded; one end of the eleventh capacitor is electrically connected to the first E pin of the first high-frequency head and demodulator, and the other end is grounded. The first E pin of the first high-frequency head and demodulator is connected to a 1.8V power supply voltage. One end of the twelfth capacitor is electrically connected to the first F pin of the first high-frequency head and demodulator, and the other end is grounded; the first F pin of the first high-frequency head and demodulator is connected to a 3.3V power supply voltage; one end of the thirteenth capacitor is electrically connected to the second F pin of the first high-frequency head and demodulator, and the other end is grounded; the first H pin of the first high-frequency head and demodulator is grounded; the first H pin of the first high-frequency head and demodulator is electrically connected to the third C pin of the first high-frequency head and demodulator; one end of the fourteenth capacitor is grounded, and the other end is electrically connected to the second H pin of the first high-frequency head and demodulator; the seventh resistor and the fifteenth capacitor are connected in series, with one end grounded and the other end connected to the third C pin of the first high-frequency head and demodulator. The H pin is electrically connected; one end of the first crystal oscillator is electrically connected to the fourteenth capacitor, and the other end is electrically connected to the seventh resistor; the third G pin of the first high-frequency head and demodulator is grounded; one end of the eighth resistor is electrically connected to the signal conversion circuit, and the other end is electrically connected to the fourth H pin of the first high-frequency head and demodulator; the tenth H pin of the first high-frequency head and demodulator is electrically connected to the eighth resistor; the sixteenth capacitor and the ninth resistor are connected in parallel, one end is grounded, and the other end is electrically connected to the fifth H pin of the first high-frequency head and demodulator; one end of the tenth resistor is electrically connected to the seventh G pin of the first high-frequency head and demodulator, and the other end is electrically connected to the ninth resistor; one end of the eleventh resistor is connected to... The 3.3V power supply voltage is applied to one end of the capacitor, which is electrically connected to the sixth H pin of the first high-frequency head and demodulator. One end of the twelfth resistor is electrically connected to the eleventh resistor, and the other end is electrically connected to the seventh G pin of the first high-frequency head and demodulator. One end of the seventeenth capacitor is grounded, and the other end is electrically connected to the twelfth resistor. The seventh E pin of the first high-frequency head and demodulator is grounded, and the seventh E pin of the first high-frequency head and demodulator is electrically connected to the seventh F pin of the first high-frequency head and demodulator. One end of the thirteenth resistor is grounded, and the other end is electrically connected to the eighth G pin of the first high-frequency head and demodulator. One end of the fourteenth resistor is grounded, and the other end is electrically connected to the ninth G pin of the first high-frequency head and demodulator.One end of the eighteenth capacitor is grounded, and the other end is electrically connected to the ninth H pin of the first high-frequency head and demodulator. The ninth H pin of the first high-frequency head and demodulator is connected to a 3.3V power supply. One end of the nineteenth capacitor is grounded, and the other end is electrically connected to the tenth H pin of the first high-frequency head and demodulator. The tenth H pin of the first high-frequency head and demodulator is electrically connected to the eighth resistor. The tenth G pin and eleventh H pin of the first high-frequency head and demodulator are both electrically connected to the signal conversion circuit. One end of the twentieth capacitor is grounded, and the other end is electrically connected to the eleventh G pin of the first high-frequency head and demodulator. The twelfth H pin of the first high-frequency head and demodulator is connected to... The twelfth resistor is electrically connected; the thirteenth H pin of the first high-frequency head and demodulator is grounded; the thirteenth H pin of the first high-frequency head and demodulator is connected to the eighth C pin; one end of the fifteenth resistor is electrically connected to the thirteenth G pin of the first high-frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit; one end of the sixteenth resistor is electrically connected to the twelfth G pin of the first high-frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit; one end of the seventeenth resistor is electrically connected to the thirteenth F pin of the first high-frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit; one end of the twenty-first capacitor is grounded, and the other end is connected to the first high-frequency head and demodulator. The frequency head and demodulator's thirteenth E pin are electrically connected. One end of the eighteenth resistor is electrically connected to the twelfth E pin of the first frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit. One end of the twenty-second capacitor is grounded, and the other end is electrically connected to the eleventh A pin of the first frequency head and demodulator. One end of the twenty-third capacitor is grounded, and the other end is electrically connected to the twelfth A pin of the first frequency head and demodulator. One end of the twenty-fourth capacitor is grounded, and the other end is electrically connected to the eleventh A pin of the first frequency head and demodulator. One end of the twenty-fifth capacitor is grounded, and the other end is electrically connected to the tenth A pin of the first frequency head and demodulator. The twenty-sixth capacitor... One end of the capacitor is grounded, and the other end is electrically connected to the ninth B pin of the first high-frequency head and demodulator. One end of the twenty-seventh capacitor is electrically connected to the twenty-sixth capacitor, and the other end is electrically connected to the ninth A pin of the first high-frequency head and demodulator. One end of the twenty-eighth capacitor is electrically connected to the twenty-seventh capacitor, and the other end is electrically connected to the tenth B pin of the first high-frequency head and demodulator. One end of the nineteenth resistor is electrically connected to the eighth A pin of the first high-frequency head and demodulator, and the other end is electrically connected to the second dual tuner and dual demodulation circuit. One end of the twentyth resistor is electrically connected to the eighth B pin of the first high-frequency head and demodulator, and the other end is electrically connected to the nineteenth resistor.One end of the 29th capacitor is electrically connected to the 7th C pin of the first high-frequency head and demodulator, and the other end is electrically connected to the 20th resistor. One end of the 30th capacitor is grounded, and the other end is electrically connected to the 5th A pin of the first high-frequency head and demodulator. One end of the 31st capacitor is grounded, and the other end is electrically connected to the 2nd A pin of the first high-frequency head and demodulator. One end of the 9th inductor is electrically connected to the 2nd A pin of the first high-frequency head and demodulator, and the other end is electrically connected to the 3rd A pin of the first high-frequency head and demodulator. The 3rd B pin of the first high-frequency head and demodulator is connected to the 2nd A pin of the first high-frequency head and demodulator. One end of the 10th inductor is electrically connected to the 4th B pin of the first high-frequency head and demodulator, and the other end is electrically connected to the 10th inductor. One end of the 12th inductor is electrically connected to the 4th A pin of the first high-frequency head and demodulator, and the other end is electrically connected to the 5th B pin of the first high-frequency head and demodulator.

4. The dual-tuner USB TV stick circuit as described in claim 3, characterized in that, The second dual tuner and dual demodulation circuit includes a second high-frequency head and demodulator, a thirteenth inductor, a fourteenth inductor, a fifteenth inductor, a sixteenth inductor, a seventeenth inductor, a thirty-second capacitor, a thirty-third capacitor, a thirty-fourth capacitor, a thirty-fifth capacitor, a thirty-sixth capacitor, a thirty-seventh capacitor, a thirty-eighth capacitor, a thirty-ninth capacitor, a fortieth capacitor, a forty-first capacitor, a forty-second capacitor, a forty-third capacitor, a forty-fourth capacitor, a forty-fifth capacitor, a forty-sixth capacitor, a forty-seventh capacitor, a forty-eighth capacitor, a forty-ninth capacitor, a fiftieth capacitor, a fifty-first capacitor, a fifty-second capacitor, a fifty-third capacitor, a fifty-fourth capacitor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, and a twenty-fourth resistor. Resistors: the 25th, 26th, 27th, 28th, 29th, 30th, 31st, 32nd, and 33rd resistors; the 13th inductor and the 32nd capacitor are connected in series, one end of which is electrically connected to the first B pin of the second high-frequency head and demodulator, and the other end is electrically connected to the 6th resistor; the first A pin of the second high-frequency head and demodulator is grounded; the first C pin of the second high-frequency head and demodulator is grounded; the second B pin of the second high-frequency head and demodulator is electrically connected to the first C pin of the second high-frequency head and demodulator; one end of the 33rd capacitor is electrically connected to the second D pin of the second high-frequency head and demodulator, and the other end is grounded; One end of the thirty-fourth capacitor is electrically connected to the first E pin of the second high-frequency head and demodulator, and the other end is grounded. The first E pin of the second high-frequency head and demodulator is connected to a 1.8V power supply. One end of the thirty-fifth capacitor is electrically connected to the first F pin of the second high-frequency head and demodulator, and the other end is grounded. The first F pin of the second high-frequency head and demodulator is connected to a 3.3V power supply. One end of the thirty-sixth capacitor is electrically connected to the second F pin of the second high-frequency head and demodulator, and the other end is grounded. The first H pin of the second high-frequency head and demodulator is grounded. The first H pin of the second high-frequency head and demodulator is electrically connected to the third C pin of the second high-frequency head and demodulator. One end of the thirty-seventh capacitor... The second high-frequency head and demodulator are electrically connected to the second H pin, and the other end is electrically connected to the second twentieth resistor. One end of the second eleventh resistor is grounded, and the other end is electrically connected to the third G pin of the second high-frequency head and demodulator. One end of the thirty-eighth capacitor is grounded, and the other end is electrically connected to the third H pin of the second high-frequency head and demodulator. One end of the twenty-second resistor is electrically connected to the signal conversion circuit, and the other end is electrically connected to the fourth H pin of the second high-frequency head and demodulator. The tenth H pin of the second high-frequency head and demodulator is electrically connected to the twenty-second resistor. The thirty-ninth capacitor and the twenty-third resistor are connected in parallel, with one end grounded and the other end electrically connected to the fifth H pin of the second high-frequency head and demodulator.One end of the 24th resistor is electrically connected to the 7th G pin of the second high-frequency head and demodulator, and the other end is electrically connected to the 24th resistor. One end of the 25th resistor is connected to a 3.3V power supply, and the other end is electrically connected to the 6th H pin of the second high-frequency head and demodulator. One end of the 26th resistor is electrically connected to the 25th resistor, and the other end is electrically connected to the 6th G pin of the second high-frequency head and demodulator. One end of the 40th capacitor is grounded, and the other end is electrically connected to the 26th resistor. The 7th E pin of the second high-frequency head and demodulator is grounded, and the 7th E pin of the second high-frequency head and demodulator is electrically connected to the 7th F pin of the second high-frequency head and demodulator. The 27th resistor... One end of the 28th resistor is grounded, and the other end is electrically connected to the eighth G pin of the second high-frequency head and demodulator. One end of the 28th resistor is grounded, and the other end is electrically connected to the ninth G pin of the second high-frequency head and demodulator. One end of the 41st capacitor is grounded, and the other end is electrically connected to the ninth H pin of the second high-frequency head and demodulator, which is connected to a 3.3V power supply. One end of the 42nd capacitor is grounded, and the other end is electrically connected to the tenth H pin of the second high-frequency head and demodulator, which is electrically connected to the 22nd resistor. The tenth G pin and eleventh H pin of the second high-frequency head and demodulator are both connected to the signal conversion capacitor. The circuit is electrically connected as follows: one end of the forty-third capacitor is grounded, and the other end is electrically connected to the eleventh G pin of the second high-frequency head and demodulator; the twelfth H pin of the second high-frequency head and demodulator is electrically connected to the twenty-sixth resistor; the thirteenth H pin of the second high-frequency head and demodulator is grounded; the thirteenth H pin of the second high-frequency head and demodulator is connected to the eighth C pin; one end of the twenty-ninth resistor is electrically connected to the thirteenth G pin of the second high-frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit; one end of the thirtieth resistor is electrically connected to the twelfth G pin of the second high-frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit; one end of the thirty-first resistor is electrically connected to the second high-frequency head and demodulator... The frequency head and demodulator's thirteenth F pin are electrically connected, and the other end is electrically connected to the signal conversion circuit; one end of the forty-fourth capacitor is grounded, and the other end is electrically connected to the thirteenth E pin of the second frequency head and demodulator; one end of the thirty-second resistor is electrically connected to the twelfth E pin of the second frequency head and demodulator, and the other end is electrically connected to the signal conversion circuit; one end of the forty-fifth capacitor is grounded, and the other end is electrically connected to the eleventh A pin of the second frequency head and demodulator; one end of the forty-sixth capacitor is grounded, and the other end is electrically connected to the twelfth A pin of the second frequency head and demodulator; one end of the forty-seventh capacitor is grounded, and the other end is electrically connected to the eleventh A pin of the second frequency head and demodulator.One end of the forty-eighth capacitor is grounded, and the other end is electrically connected to pin 10A of the second high-frequency head and demodulator. One end of the forty-ninth capacitor is grounded, and the other end is electrically connected to pin 9B of the second high-frequency head and demodulator. One end of the fiftieth capacitor is electrically connected to the forty-ninth capacitor, and the other end is electrically connected to pin 9A of the second high-frequency head and demodulator. One end of the fifty-first capacitor is electrically connected to the fiftieth capacitor, and the other end is electrically connected to pin 10B of the second high-frequency head and demodulator. One end of the thirty-third resistor is electrically connected to pin 8B of the second high-frequency head and demodulator, and the other end is electrically connected to the fifty-second capacitor. One end of the fifty-second capacitor is electrically connected to pin 7C of the second high-frequency head and demodulator, and the other end is electrically connected to pin 8A of the second high-frequency head and demodulator. The fifty-third capacitor has one end grounded and the other end electrically connected to the fifth A pin of the second high-frequency head and demodulator. The fifty-fourth capacitor has one end grounded and the other end electrically connected to the second A pin of the second high-frequency head and demodulator. The fourteenth inductor has one end electrically connected to the second A pin of the second high-frequency head and demodulator and the other end electrically connected to the third A pin of the second high-frequency head and demodulator. The third B pin of the second high-frequency head and demodulator is connected to the second A pin of the second high-frequency head and demodulator. The fifteenth inductor has one end electrically connected to the fourth B pin of the second high-frequency head and demodulator and the other end electrically connected to the fifteenth inductor. The seventeenth inductor has one end electrically connected to the fourth A pin of the second high-frequency head and demodulator and the other end electrically connected to the fifth B pin of the second high-frequency head and demodulator.

5. The dual-tuner USB TV stick circuit as described in claim 4, characterized in that, The signal conversion circuit includes a bridge for converting TS stream signals to USB signals, resistors 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, and 46, a second crystal oscillator, capacitors 55, 56, and 57, and a common-mode inductor for windings. Resistors 34, 35, and 36 are connected in series, with one end electrically connected to pin 56 of the bridge for converting TS stream signals to USB signals, and the other end connected to pin 10G of the first high-frequency head and demodulator, and pin 10G of the second high-frequency head and demodulator. The 10th G pin of the demodulator is electrically connected; the 37th and 38th resistors are connected in series, one end of which is electrically connected to the 35th resistor, and the other end is electrically connected to the 11th H pin of the first high-frequency head and demodulator, and the 11th H pin of the second high-frequency head and demodulator; one end of the 55th capacitor is grounded, and the other end is electrically connected to the 34th capacitor; one end of the 56th capacitor is grounded, and the other end is electrically connected to the 37th resistor; one end of the 57th capacitor is grounded, and the other end is electrically connected to the 10th pin of the bridge that converts the TS stream signal to a USB signal; the first pin of the second crystal oscillator is electrically connected to the 57th capacitor, the second pin of the second crystal oscillator is grounded, and the third pin of the second crystal oscillator... One pin is connected to the second pin of the second crystal oscillator, and the fourth pin of the second crystal oscillator is connected to the third pin of the second crystal oscillator; one end of the thirty-ninth resistor is electrically connected to the sixtieth pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the thirty-first resistor; one end of the fortieth resistor is electrically connected to the sixty-second pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the thirty-tenth resistor; one end of the forty-first resistor is electrically connected to the sixty-first pin of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to the twenty-ninth resistor; one end of the forty-second resistor is electrically connected to the bridge that converts TS stream signals to USB signals. Pin 59 is electrically connected, and the other end is electrically connected to resistor 32; one end of resistor 43 is electrically connected to pin 3 of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to resistor 17; one end of resistor 44 is electrically connected to pin 5 of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to resistor 16; one end of resistor 45 is electrically connected to pin 4 of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to resistor 15; one end of resistor 46 is electrically connected to pin 2 of the bridge that converts TS stream signals to USB signals, and the other end is electrically connected to resistor 18.The fourth pin of the common-mode inductor is electrically connected to the thirty-ninth pin of the bridge that converts the TS stream signal to a USB signal; the third pin of the common-mode inductor is electrically connected to the USB hub circuit; the first pin of the common-mode inductor is electrically connected to the thirty-eighth pin of the bridge that converts the TS stream signal to a USB signal; and the second pin of the common-mode inductor is electrically connected to the USB hub circuit.

6. The dual-tuner USB TV stick circuit as described in claim 5, characterized in that, The USB HUB circuit includes a hub controller chip, capacitors 58, 59, 60, and 61, resistors 47, 48, 49, 50, 51, 52, 53, 54, 55, and 56, and a third crystal oscillator. One end of the 47th resistor is grounded, and the other end is electrically connected to pin 16 of the hub controller chip. One end of the 58th capacitor is grounded, and the other end is electrically connected to pin 17 of the hub controller chip. One end of the 48th resistor is electrically connected to pin 22 of the hub controller chip. One end of the capacitor is connected to a 3.3V power supply; one end of the forty-ninth resistor is grounded, and the other end is electrically connected to the twenty-third pin of the hub controller chip; one end of the fiftieth resistor is electrically connected to the forty-ninth resistor, and the other end is connected to a 3.3V power supply; one end of the fifty-first resistor is grounded, and the other end is electrically connected to the twenty-fourth pin of the hub controller chip; one end of the fifty-ninth capacitor is grounded, and the other end is electrically connected to the fiftieth resistor; one end of the fifty-second resistor is grounded, and the other end is electrically connected to the twenty-fifth pin of the hub controller chip; one end of the fifty-third resistor is electrically connected to the fifty-second resistor, and the other end is connected to the USB... The TYPE-C interface is electrically connected; one end of the 54th resistor is electrically connected to the 32nd pin of the hub controller chip, and the other end is connected to a 3.3V power supply; one end of the 55th resistor is electrically connected to the 44th pin of the hub controller chip, and the other end is electrically connected to the 45th pin of the hub controller chip; one end of the 60th capacitor is grounded, and the other end is electrically connected to the 56th resistor; one end of the 61st capacitor is grounded, and the other end is electrically connected to the 56th resistor; the third crystal oscillator is electrically connected between the 60th capacitor and the 61st capacitor; pins 56, 57, 59, and 60 of the hub controller chip are all electrically connected to the SD / TF card recording circuit; pins 36, 37, 38, 39, 41, and 42 of the hub controller chip are all electrically connected to the USB TYPE-C interface.

Images