Wireless audio transmitting circuit

Abstract

The wireless audio transmitting circuit comprises a straight pin socket connector, a volume adjusting chip, an ADC coding chip, an MCU chip, a 2.4 G transmitting chip, an antenna matching network circuit, an antistatic chip and an antenna. Therefore, ADC coding is carried out through the ADC coding chip, an operational amplifier is not used, analog audio signals are prevented from being deformed or killed, and the analog audio signals are not interfered by RF signals of the 2.4 G transmitting chip, so that the anti-interference capability of the circuit is improved, the power consumption of the circuit is reduced, the wireless audio transmitting circuit adopts the anti-static chip, and the anti-static capability of the circuit is improved.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and more specifically, to a wireless audio transmission circuit. Background Art

[0002] Driven by the rapid development of science and technology, wireless audio communication technology uses electromagnetic waves to transmit information in space and has been widely popularized in many fields. Among them, 2.4G wireless audio communication technology is highly favored due to its fast transmission speed and long distance. It is widely used in wireless headphones, Bluetooth speakers and other devices, making audio equipment more convenient.

[0003] However, 2.4G high-frequency wireless communication equipment also has many problems. Static electricity and interference seriously threaten audio signals and data transmission. The existing operational amplifier circuit will be interfered by the 2.4G transmitter chip RF signal, causing the analog audio signal to deform, attenuate or even disappear. The operational amplifier itself has high power consumption, high cost and large size, which is not conducive to equipment energy saving, cost control and miniaturization design.

[0004] How to improve the anti-interference and anti-static capabilities of 2.4G wireless audio circuits and reduce circuit power consumption are issues that need attention. Summary of the invention

[0005] In view of the above problems, the present application provides a wireless audio transmission circuit to improve the circuit's anti-interference and anti-static capabilities and reduce circuit power consumption.

[0006] In order to achieve the above objectives, the specific plan is proposed as follows:

[0007] A wireless audio transmission circuit, comprising a straight pin socket connector, a volume adjustment chip, an ADC encoding chip, an MCU chip, a 2.4G transmission chip, an antenna matching network circuit, an antistatic chip and an antenna;

[0008] The volume adjustment chip is connected to the straight pin socket connector to obtain audio through the straight pin socket connector;

[0009] The MCU chip is connected to the volume adjustment chip to control the volume adjustment chip to adjust the volume of the audio through an analog I2C to obtain an adjusted analog audio;

[0010] The volume adjustment chip is used to filter the output audio to obtain filtered analog audio;

[0011] The volume adjustment chip is connected to the ADC encoding chip to input the analog audio into the ADC encoding chip;

[0012] The ADC encoding chip is connected to the MCU chip to encode the analog audio under the control of the MCU chip to obtain a digital signal;

[0013] The MCU chip is connected to the 2.4G transmitting chip to transmit the digital signal to the 2.4G transmitting chip through an SPI signal;

[0014] The 2.4G transmitting chip is used to convert the digital signal into a 2.4G audio signal to be transmitted;

[0015] The 2.4G transmitting chip is connected to the antenna through the antenna matching network circuit and the antistatic chip in sequence, so as to transmit the 2.4G audio signal to be transmitted through the antenna.

[0016] Optionally, the volume adjustment chip is a PT22 chip, and the volume adjustment chip includes 8 pins;

[0017] The straight pin socket connector output is coupled through a first capacitor and a first resistor and then connected to the 8th pin of the volume adjustment chip.

[0018] Optionally, the MCU chip is connected to the volume adjustment chip by being connected to the 4th and 5th pins of the volume adjustment chip.

[0019] Optionally, the sixth pin of the volume adjustment chip is used for power supply, and the sixth pin of the volume adjustment chip is connected to the first filter capacitor and the second filter capacitor.

[0020] Optionally, the ADC encoding chip is a TLV320ADC chip, and the ADC encoding chip includes 25 pins;

[0021] After the output of the 7th pin of the volume adjustment chip, it is connected to the 6th pin and the 13th pin of the ADC encoding chip through the second resistor and the second capacitor in sequence.

[0022] Optionally, pin 1, pin 2, pin 3, pin 4 and pin 24 of the ADC encoding chip are all connected to the MCU chip;

[0023] The 10th, 21st and 22nd pins of the ADC encoding chip are all used for chip power supply.

[0024] Optionally, the MCU chip is a chip of the STC90 model, and the MCU chip includes 64 pins;

[0025] Pins 30, 33, 34, 36 and 37 of the MCU chip are all connected to the ADC encoding chip;

[0026] Pins 20, 21, 22, 23, 24 and 25 of the MCU chip are all connected to the 2.4G transmitting chip.

[0027] Optionally, the 2.4G transmitting chip is a chip of Si24R model, and the 2.4G transmitting chip includes 20 pins;

[0028] The 7th, 15th and 18th pins of the 2.4G transmitting chip are all used for power supply;

[0029] After the 11th pin of the 2.4G transmitting chip is output, power is supplied to the antenna through the antenna matching network circuit and the antistatic chip;

[0030] After the 12th and 13th pins of the 2.4G transmitting chip are output, they are connected to the antenna matching network circuit through the antistatic chip.

[0031] Optionally, the antenna matching network circuit includes a first magnetic bead, a second magnetic bead and a third capacitor;

[0032] The 11th pin of the 2.4G transmitting chip is connected to the second magnetic bead, the 12th pin of the 2.4G transmitting chip is connected to the first magnetic bead, and the 13th pin of the 2.4G transmitting chip is connected to the third capacitor.

[0033] Optionally, the wireless audio transmitting circuit further includes a first power chip and a second power chip;

[0034] The first power supply circuit and the second power supply circuit are both used to provide power to the ADC encoding chip.

[0035] By means of the above technical solution, the wireless audio transmitting circuit of the present application includes a straight pin socket connector, a volume adjustment chip, an ADC encoding chip, an MCU chip, a 2.4G transmitting chip, an antenna matching network circuit, an anti-static chip and an antenna. It can be seen that ADC encoding is performed through the ADC encoding chip without passing through the operational amplifier, so as to avoid deformation or elimination of the analog audio signal, and will not be interfered by the 2.4G transmitting chip RF signal, thereby improving the circuit's anti-interference ability and reducing the circuit's power consumption. The wireless audio transmitting circuit adopts an anti-static chip, thereby improving the circuit's anti-static ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0037] Figure 1 A structural diagram of a wireless audio transmission circuit provided in an embodiment of the present application;

[0038] Figure 2 A signal processing schematic diagram of a wireless audio transmitting circuit processing an audio signal provided in an embodiment of the present application;

[0039] Figure 3 Another structural diagram of the wireless audio transmitting circuit provided in the embodiment of the present application;

[0040] Figure 4 A circuit schematic diagram of a wireless audio transmission circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] Figure 1 A signal processing schematic diagram of a wireless audio transmitting circuit processing an audio signal provided in an embodiment of the present application, including various chips and sub-circuits included in the wireless audio transmitting circuit, such as Figure 1 As shown, the wireless audio transmission circuit may include:

[0043] Straight pin socket connector, volume adjustment chip, ADC encoding chip, MCU chip, 2.4G transmission chip, antenna matching network circuit, anti-static chip and antenna.

[0044] Among them, the straight pin socket connector is connected to the volume adjustment chip, and the volume adjustment chip is connected to the antenna through the ADC encoding chip, the MCU chip, the 2.4G transmitting chip, the antenna matching network circuit, and the anti-static chip in sequence.

[0045] Specifically, the signal processing process of the wireless audio transmitting circuit for processing the audio signal is as follows: Figure 2 shown.

[0046] Audio can enter from the terminal of the straight pin socket connector so that the volume adjustment chip can obtain the audio. The MCU chip controls the volume adjustment chip through analog I2C to adjust the audio volume and obtain the adjusted analog audio. The volume adjustment chip is used to filter the output audio to obtain the filtered analog audio, and the analog audio is input to the ADC encoding chip. Under the control of the MCU chip, the ADC encoding chip encodes the analog audio to obtain a digital signal, and the MCU chip transmits the digital signal to the 2.4G transmitting chip through the SPI signal. The 2.4G transmitting chip converts the digital signal into a 2.4G audio signal to be transmitted. After the 2.4G audio signal to be transmitted is processed by the antenna matching network circuit and the antistatic chip, the antenna finally transmits the signal.

[0047] The wireless audio transmitting circuit of the present application includes a straight pin socket connector, a volume adjustment chip, an ADC encoding chip, an MCU chip, a 2.4G transmitting chip, an antenna matching network circuit, an anti-static chip and an antenna. It can be seen that ADC encoding is performed through the ADC encoding chip, and the operational amplifier is not used to avoid deformation or obliteration of the analog audio signal, and it will not be interfered by the 2.4G transmitting chip RF signal, thereby improving the circuit's anti-interference ability and reducing the circuit's power consumption. The wireless audio transmitting circuit uses an anti-static chip, thereby improving the circuit's anti-static ability.

[0048] Furthermore, since the wireless audio transmission circuit does not use an operational amplifier, the cost and volume of the circuit can be greatly reduced, which is conducive to large-scale production and miniaturized design.

[0049] Furthermore, since the wireless audio transmitting circuit adopts ADC audio coding signal processing technology, it can effectively improve the quality of the audio signal, thereby improving the effect of wireless communication, and further improve the circuit's anti-interference ability against external electromagnetic interference, human body electrostatic interference and other problems.

[0050] In some embodiments of the present application, the wireless audio transmitting circuit mentioned in the above embodiments is further introduced. The wireless audio transmitting circuit may also include two power chips, namely a first power chip and a second power chip.

[0051] Specifically, Figure 3 As shown, both the first power chip and the second power chip can provide power to the ADC encoding chip.

[0052] It can be understood that the ADC encoding chip is powered by the first power chip and the second power chip, so that the audio encoding and 2.4G transmitting chip are more stable and more resistant to interference.

[0053] The first power chip and the second power chip may both be chips of model LN1182FF3.

[0054] The wireless audio transmitting circuit provided in this embodiment adopts a dual power supply mode, which can make the audio signal output range wider and has better stability than a single power supply. It can effectively reduce the power supply interference and power supply noise generated in the circuit, and further improve the anti-static and anti-interference capabilities of the circuit.

[0055] In some embodiments of the present application, the various chips and sub-circuits of the wireless audio transmitting circuit mentioned in the above embodiments are further introduced, and specific reference can be made to Figure 4 .

[0056] Specifically, the volume adjustment chip is a PT22 model chip, and the volume adjustment chip may include 8 pins. The straight pin socket connector P1 may be XH2.54MM, and may have 6 pins. The straight pin socket connector P1 may have a microphone stem interface to receive microphone audio. The ADC encoding chip is a TLV320ADC model chip, and the ADC encoding chip may include 25 pins. The MCU chip is an STC90 model chip, and the MCU chip includes 64 pins. The 2.4G transmitting chip is an Si24R model chip, and the 2.4G transmitting chip includes 20 pins.

[0057] Among them, after the output of the 4th pin of the straight pin socket connector, it is coupled through the first capacitor C10 and the first resistor R13 and then connected to the 8th pin of the volume adjustment chip.

[0058] The MCU chip is connected to the volume adjustment chip by being connected to the 4th and 5th pins of the volume adjustment chip.

[0059] The sixth pin of the volume adjustment chip is a power supply pin, which is used for power supply. The sixth pin of the volume adjustment chip is connected to the first filter capacitor C203 and the second filter capacitor E1.

[0060] After the output of the 7th pin of the volume adjustment chip, it is connected to the 6th pin and the 13th pin of the ADC encoding chip through the second resistor R213 and the second capacitor C159 in sequence.

[0061] The 10th, 21st and 22nd pins of the ADC encoding chip are power supply pins, which are used for chip power supply and are connected to the first power chip U15 and the second power chip U16. Among them, C157, C158, C93, C135, C136 and C142 are filter capacitors to filter the power input of the first power chip U15 and the second power chip U16.

[0062] The 30th, 33rd, 34th, 36th and 37th pins of the MCU chip are all connected to the ADC encoding chip.

[0063] Pins 20, 21, 22, 23, 24 and 25 of the MCU chip are all connected to the 2.4G transmitting chip.

[0064] The 7th, 15th and 18th pins of the 2.4G transmitting chip are power supply pins, all used for power supply.

[0065] The 11th pin of the 2.4G transmitting chip is the antenna PA power supply pin. After the 11th pin of the 2.4G transmitting chip is output, the antenna is powered via the antenna matching network circuit and the antistatic chip.

[0066] The 12th and 13th pins of the 2.4G transmitting chip are antenna interfaces. After the 12th and 13th pins of the 2.4G transmitting chip are output, they are connected to the antenna matching network circuit through the antistatic chip.

[0067] Specifically, the antenna matching network circuit may include a first magnetic bead L1, a second magnetic bead L3 and a third capacitor C24. L1, L3 and C24 form an antenna matching network circuit, which is connected to the antistatic chip U8 and finally connected to the antenna ANT1 to transmit the signal.

[0068] The 11th pin of the 2.4G transmitting chip is connected to the second magnetic bead L3, the 12th pin of the 2.4G transmitting chip is connected to the first magnetic bead L1, and the 13th pin of the 2.4G transmitting chip is connected to the third capacitor C24.

[0069] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0070] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can refer to each other.

[0071] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wireless audio transmitting circuit, characterized in that: Including straight pin socket connector, volume adjustment chip, ADC encoding chip, MCU chip, 2.4G transmission chip, antenna matching network circuit, antistatic chip and antenna; The volume adjustment chip is connected to the straight pin socket connector to obtain audio through the straight pin socket connector; The MCU chip is connected to the volume adjustment chip to control the volume adjustment chip to adjust the volume of the audio through an analog I2C to obtain an adjusted analog audio; The volume adjustment chip is used to filter the output audio to obtain filtered analog audio; The volume adjustment chip is connected to the ADC encoding chip to input the analog audio into the ADC encoding chip; The ADC encoding chip is connected to the MCU chip to encode the analog audio under the control of the MCU chip to obtain a digital signal; The MCU chip is connected to the 2.4G transmitting chip to transmit the digital signal to the 2.4G transmitting chip through an SPI signal; The 2.4G transmitting chip is used to convert the digital signal into a 2.4G audio signal to be transmitted; The 2.4G transmitting chip is connected to the antenna through the antenna matching network circuit and the antistatic chip in sequence, so as to transmit the 2.4G audio signal to be transmitted through the antenna.

2. The wireless audio transmitting circuit according to claim 1, characterized in that: The volume adjustment chip is a PT22 chip, and the volume adjustment chip includes 8 pins; The straight pin socket connector output is coupled through a first capacitor and a first resistor and then connected to the 8th pin of the volume adjustment chip.

3. The wireless audio transmitting circuit according to claim 2, characterized in that: The MCU chip is connected to the volume adjustment chip by being connected to the 4th and 5th pins of the volume adjustment chip.

4. The wireless audio transmitting circuit according to claim 2, characterized in that: The sixth pin of the volume adjustment chip is used for power supply, and the sixth pin of the volume adjustment chip is connected to the first filter capacitor and the second filter capacitor.

5. The wireless audio transmitting circuit according to claim 2, characterized in that: The ADC encoding chip is a TLV320ADC chip, and the ADC encoding chip includes 25 pins; After the output of the 7th pin of the volume adjustment chip, it is connected to the 6th pin and the 13th pin of the ADC encoding chip through the second resistor and the second capacitor in sequence.

6. The wireless audio transmitting circuit according to claim 1, characterized in that: The 1st, 2nd, 3rd, 4th and 24th pins of the ADC encoding chip are all connected to the MCU chip; The 10th, 21st and 22nd pins of the ADC encoding chip are all used for chip power supply.

7. The wireless audio transmitting circuit according to claim 1, characterized in that: The MCU chip is a chip of STC90 model, and the MCU chip includes 64 pins; Pins 30, 33, 34, 36 and 37 of the MCU chip are all connected to the ADC encoding chip; Pins 20, 21, 22, 23, 24 and 25 of the MCU chip are all connected to the 2.4G transmitting chip.

8. The wireless audio transmitting circuit according to claim 7, characterized in that: The 2.4G transmitting chip is a Si24R chip, and the 2.4G transmitting chip includes 20 pins; The 7th, 15th and 18th pins of the 2.4G transmitting chip are all used for power supply; After the 11th pin of the 2.4G transmitting chip is output, power is supplied to the antenna through the antenna matching network circuit and the antistatic chip; After the 12th and 13th pins of the 2.4G transmitting chip are output, they are connected to the antenna matching network circuit through the antistatic chip.

9. The wireless audio transmitting circuit according to claim 8, characterized in that: The antenna matching network circuit includes a first magnetic bead, a second magnetic bead and a third capacitor; The 11th pin of the 2.4G transmitting chip is connected to the second magnetic bead, the 12th pin of the 2.4G transmitting chip is connected to the first magnetic bead, and the 13th pin of the 2.4G transmitting chip is connected to the third capacitor.

10. The wireless audio transmitting circuit according to any one of claims 1 to 9, characterized in that: Also includes a first power chip and a second power chip; The first power supply circuit and the second power supply circuit are both used to provide power to the ADC encoding chip.

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