Interface conversion circuit and electronic equipment

Abstract

The present application discloses an interface conversion circuit and an electronic device, the circuit includes an audio codec, a USB audio input interface, an LT2611UXC chip, an LVDS audio input interface, and an HDMI output interface, the USB audio input interface is connected to the input end of the audio codec, the output end of the audio codec is connected to the LT2611UXC chip, the LT2611UXC chip is also connected to the LVDS audio input interface and the HDMI output interface, the LT2611UXC chip is an LVDS to HDMI2.0 converter, the audio codec is used to convert the input USB audio signal into an IIS audio signal and transmit it to the LT2611UXC chip, the LT2611UXC chip converts the LVDS audio signal and the IIS audio signal received from the LVDS audio input interface into an HDMI signal and outputs it from the HDMI output interface. The present application utilizes an audio codec to convert a USB audio signal into an IIS audio signal, and composes an animation with audio with the LVDS signal, without the need for external connection of other audio signals, thus saving costs.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to an interface conversion circuit and electronic equipment. Background Art

[0002] The Low-Voltage Differential Signaling (LVDS) transmission mode is a signal transmission mode that uses extremely low voltage swings to transmit data at high speed differentially. Devices with LVDS interfaces transmit data on cables through the differential transmission mode, and compared with other signal transmission modes, such as High Definition Multimedia Interface (HDMI) signal transmission, its transmission rate is higher, and it can save the device's cables, thereby saving the device's physical space.

[0003] In the prior art, LVDS is converted to HDMI with only video signal output, but no audio signal. A separate IIS signal input is required to convert it into a complete HDMI signal with audio and video. At present, with the development of social science and technology, people have higher and higher requirements for video quality and form. High Definition Multimedia Interface is a digital video / audio interface technology, a dedicated digital interface suitable for image transmission, which can transmit audio and image signals at the same time, and does not require digital / analog or analog / digital conversion before signal transmission. It is a commonly used video and audio interface signal. Therefore, during video or audio playback, files in other interface formats are often converted into HDMI interface signal formats.

[0004] Patent CN101753885A discloses a device for outputting television signals, which can send LVDS signals to a dedicated chip to convert them into HDMI interface signals. This method uses a dedicated chip to convert a LVDS signal into an HDMI signal, and cannot realize the conversion of multiple forms of LVDS video interface signals into HDMI interface signals. Patent CN108259802A discloses an interface conversion circuit, which converts LVDS signals into HDMI interface signals. It uses an x86 CPU processor on a complex instruction system computer CICS device to convert LVDS into an analog VGA signal through programming and a digital-to-analog converter, and then uses a dedicated chip to convert VGA into an HDMI interface signal. This method uses a CPU programming method to achieve signal conversion, and the intermediate process is to convert digital image signals into analog VGA, and then convert analog VGA signals into HDMI interface signals through a dedicated chip. In summary, the problems existing in the prior art are: (1) The existing device for converting video LVDS interface signals into HDMI interface signals uses a dedicated chip, and cannot realize the conversion of multiple forms of LVDS / miniLVDS video interface signals into HDMI interface signals. (2) At the same time, the existing conversion technology uses computer equipment (CICS) with complex instructions, which does not take advantage of the miniaturization of the equipment; at the same time, the intermediate conversion process undergoes analog-to-digital conversion processing, which causes loss of image signals. Summary of the invention

[0005] In view of the above technical problems, the present invention provides an interface conversion circuit and an electronic device, which do not need to be externally connected to other audio signals and save costs.

[0006] The first embodiment of the present invention provides an interface conversion circuit, which includes an audio codec, a USB audio input interface, a LT2611UXC chip, an LVDS audio input interface, and an HDMI output interface. The USB audio input interface is connected to the input end of the audio codec, and the output end of the audio codec is connected to the LT2611UXC chip. The LT2611UXC chip is also connected to the LVDS audio input interface and the HDMI output interface. The LT2611UXC chip is an LVDS to HDMI2.0 converter. The audio codec is used to convert the input USB audio signal into an IIS audio signal and transmit it to the LT2611UXC chip. The LT2611UXC chip converts the IIS audio signal and the LVDS audio signal received from the LVDS audio input interface into an HDMI signal and outputs it from the HDMI output interface.

[0007] Optionally, the audio codec adopts an ALC4050 chip.

[0008] Optionally, the LVDS audio input interface includes a first LVDS audio input interface and a second LVDS audio input interface.

[0009] Optionally, the circuit further includes a power supply module and a voltage conversion module, wherein the power supply module is used to provide power for the circuit, and the voltage conversion module is connected to the power supply module and is used to convert the power supply voltage into a first voltage to power the circuit.

[0010] Optionally, the voltage conversion module includes a first voltage conversion module and a second voltage conversion module, the first voltage conversion module is used to convert the power supply voltage into a first voltage to power the circuit, and the second voltage conversion module is used to convert the power supply voltage into a second voltage to power the circuit.

[0011] Optionally, the first voltage conversion module includes a TMI3108 chip.

[0012] Optionally, the second voltage conversion module includes an AMS117-ADJ chip.

[0013] Optionally, the second voltage conversion module also includes a resistor R104, a resistor R105, a capacitor C326, a capacitor C327, a capacitor C328, a capacitor C330, a capacitor C331 and a capacitor C329, the first pin of the AMS117-ADJ chip is respectively connected to one end of the resistor R104 and one end of the resistor R105, the other end of the resistor R105 is grounded, the other end of the resistor R104 is respectively connected to the second pin and the fourth pin of the AMS117-ADJ chip, the other end of the resistor R104 is also connected to one end of the capacitor C326, one end of the capacitor C327 and one end of the capacitor C328, the third pin of the AMS117-ADJ chip is respectively connected to one end of the capacitor C330, one end of the capacitor C331 and one end of the capacitor C329, and the other ends of the capacitors C330, C331 and C329 are grounded.

[0014] Optionally, the first voltage conversion module further includes an inductor L1, and the third pin of the TMI3108 chip is connected to the inductor L1.

[0015] A second embodiment of the present invention provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements any one of the above-mentioned interface conversion circuits when executing the computer program.

[0016] In the technical solution provided by the embodiment of the present invention, the circuit includes an audio codec, a USB audio input interface, a LT2611UXC chip, an LVDS audio input interface, and an HDMI output interface. The USB audio input interface is connected to the input end of the audio codec, and the output end of the audio codec is connected to the LT2611UXC chip. The LT2611UXC chip is also connected to the LVDS audio input interface and the HDMI output interface. The LT2611UXC chip is an LVDS to HDMI2.0 converter. The audio codec is used to convert the input USB audio signal into an IIS audio signal and transmit it to the LT2611UXC chip. The LT2611UXC chip converts the IIS audio signal and the LVDS audio signal received from the LVDS audio input interface into an HDMI signal and outputs it from the HDMI output interface. Compared with the prior art, the present application uses an audio codec to convert the USB audio signal into an IIS audio signal, and composes an animation with audio with the LVDS signal, without the need for external other audio signals, thus saving costs. The present invention supports two-way LVDS and USB2.0 audio input, and an HDMI2.0 display output interface, and can be applied to various video playback scenes; a power supply scheme of internal conversion by USB input is adopted, which is low-carbon and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a flowchart of an interface conversion circuit.

[0018] Figure 2 The figure is a circuit diagram of the LVDS audio input interface of the present invention.

[0019] Figure 3 It is a schematic diagram of the LT2611UXC chip of the present invention.

[0020] Figure 4 Schematic diagram of the ALC4050 chip of the present invention.

[0021] Figure 5 FIG. 4 is a circuit diagram of the first voltage module and the second voltage module of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0023] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0024] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0025] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0026] As mentioned above, the prior art has the following technical problems, namely, the existing device for converting video LVDS interface signals into HDMI interface signals uses a dedicated chip, which cannot realize the conversion of various forms of LVDS / miniLVDS video interface signals into HDMI interface signals; at the same time, the existing conversion technology uses computer equipment with complex instructions, does not take advantage of the miniaturization of the equipment, and the intermediate conversion process is processed by analog-to-digital conversion, which causes loss of image signals. In order to solve the technical problems existing in the prior art, there is the following difficulty, namely, converting various forms of LVDS / miniLVDS video interface signals into HDMI interface signals involves processing video LVDS / miniLVDS interface signals with different resolutions, different chroma depths, and different differential channels. For example, HD resolutions are usually 1080*1920, 1366*768, 1280*768, 1280*720, etc.; SD resolutions are usually 800*600, 480*320, 640*480, etc.; color depths are 6bit, 8bit, 10bit, 12bit, 16bit, etc. The wider the color depth, the richer the color; LVDS differential channels usually have single 6-bit LVDS output interface, dual 6-bit LVDS output interface, single 8-bit LVDS output interface, dual 8-bit LVDS output interface, etc.; to convert the differential signals of different forms of video LVDS / minilvds interfaces into HDMI interface signals of standard multimedia streams, it is obviously impossible to use dedicated conversion chips, because dedicated conversion chips are designed for specific forms of interface signals. At the same time, computer equipment that uses complex instructions does not take advantage of the miniaturization of equipment.

[0027] The present invention innovatively proposes an interface conversion circuit, please refer to Figure 1As shown, the circuit includes an audio codec 10, a USB audio input interface 20, a LT2611UXC chip 30, an LVDS audio input interface, and an HDMI output interface 50. The USB audio input interface 20 is connected to the input end of the audio codec 10, and the output end of the audio codec 10 is connected to the LT2611UXC chip 30. The LT2611UXC chip 30 is also connected to the LVDS audio input interface and the HDMI output interface 50. The LT2611UXC chip 30 is an LVDS to HDMI2.0 converter. The audio codec 10 is used to convert the input USB audio signal into an IIS audio signal and transmit it to the LT2611UXC chip 30. The LT2611UXC chip 30 converts the IIS audio signal and the LVDS audio signal received from the LVDS audio input interface into an HDMI signal and outputs it from the HDMI output interface 50.

[0028] The present invention utilizes the audio codec 10 to convert the USB audio signal into an IIS audio signal, and composes an animation with audio with the LVDS signal, without the need for external connection of other audio signals, thus saving costs.

[0029] The LVDS audio input interface includes a first LVDS audio input interface 41 and a second LVDS audio input interface 42. The present invention supports two-way LVDS and USB2.0 audio input, HDMI2.0 display output interface, and can be applied to various video playback scenes; it adopts a power supply solution of USB input for internal conversion, which is low-carbon and environmentally friendly.

[0030] In one embodiment of the present invention, the LVDS input pin is directly implemented using a 2.*15 pin header. Figure 2 The figure shows a schematic diagram of the LVDS audio input interface. The I2S input is completed using the USB2.0 port. The audio codec 10 adopts the ALC4050 chip. The LVDS pin header is inserted on the PCB and connected to the LVDS in a differential pair to ensure signal integrity and anti-interference, facilitate wiring, and save space.

[0031] In the present invention, the LT2611UXC chip 30 is a high-performance LVDS to HDMI2.0 converter suitable for STB and DVD applications. The LVDS audio input interface can be configured as a single port or dual port with 1 high-speed clock channel and 3 to 4 high data channels, with a maximum speed of 1.2Gbps / lane, and can support a total bandwidth of up to 9.6Gbps. The LT2611UXC chip supports flexible video data mapping paths for 2D and 3D applications. The HDMI2.0 output supports data rates of up to 3Gbps, providing sufficient bandwidth for 4K@30Hz video, and also supports HDCP2.2 for data encryption.

[0032] Please refer to Figure 3 As shown, the LT2611UXC chip 30 has two digital audio input interfaces: I2S and SPDIF. The I2S interface supports 2-channel LPCM, while the SPDIF interface supports 2-channel LPCM or compressed audio, and the maximum sampling rate of both is 192KHz. The CSCL / CSDA pins of the LT2611UXC chip 30 are used to upgrade the chip firmware, and test point tests can be added; the version can also be upgraded by connecting to an external MCU and I2C port.

[0033] In one embodiment of the present invention, the audio codec 10 uses an ALC4050 chip. Figure 4 As shown, the ALC4050 chip is a single-chip USB 2.0 audio codec with built-in USB 2.0 to I2S and SPDIF interfaces for high-speed analog and digital audio performance. The ALC4050 integrates USB2.0 function controller and USB transceiver with high data transfer rate, high-speed MCU (microprocessor unit), DC-DC regulator, digital audio I2S interface, I2C control interface, and SPI interface in one. The main features are lower power consumption and better compatibility. It is also a single-chip USB 2.0 high-speed audio codec with built-in MCU for flexible use. It is suitable for headphones, headphone adapters, speakers and microphone applications. The internal MCU can also be developed into many different applications, such as Microsoft TM Lync / Skype / VoIP devices, mobile phones or tablet / tablet docking devices. The ALC4050 is compatible with USB Audio Class 1.0 and USB 2.0 full speed, so it can be plug-and-play installed on major operating systems without any additional software. The internal DAC supports 44.1~384KHz and ADC supports 44.1~192KHz sampling rates with a resolution of 16 / 24 / 32 bits. The ALC4050 also integrates 16K bytes OTP and crystal, but requires very few passive components to make the finished product. In this way, the total BOM cost can be saved and the PCB area can be smaller.

[0034] The audio codec of the present invention has high integration. The codec integrates stereo analog input and output circuits, simplifies system design, and reduces the need for external components. It supports high-speed USB 2.0 standards, can process large amounts of audio data, and provide lossless audio transmission. It has I2S and SPDIF interfaces: these two digital audio interfaces enable the ALC4050 to seamlessly connect with various digital audio sources and receivers. Through the I2C bus, the codec can be easily programmed and configured to adapt to different application scenarios. It supports digital microphones to meet the needs of modern audio devices for digital microphones and improve recording quality. It has a built-in hardware active noise reduction function that can effectively reduce environmental noise and provide a clear voice call and audio playback experience. The versatility and high integration of the ALC4050 chip make it an ideal choice for developing high-quality audio products. Combined with the hardware active noise reduction function, the ALC4050 can bring users an immersive audio experience and meet the growing demand for audio devices.

[0035] The circuit also includes a power supply module and a voltage conversion module, wherein the power supply module is used to provide power to the circuit, and the voltage conversion module is connected to the power supply module and is used to convert the power supply voltage into a first voltage to power the circuit. Specifically, the voltage conversion module includes a first voltage conversion module and a second voltage conversion module, wherein the first voltage conversion module is used to convert the power supply voltage into a first voltage to power the circuit, and the second voltage conversion module is used to convert the power supply voltage into a second voltage to power the circuit.

[0036] In one embodiment of the present invention, the first voltage conversion module includes a TMI3108 chip, and the second voltage conversion module includes an AMS117-ADJ chip. Figure 5 As shown, the present invention uses USB_5V as the input power supply, does not require other separate power inputs, and uses the AMS117-ADJ chip to convert the 5V power supply to 3.3V; and uses the TMI3108 chip to convert the 5V power supply to 1.2V voltage, with a maximum output current of 1A, reducing costs.

[0037] Please refer to Figure 5As shown, the second voltage conversion module also includes a resistor R104, a resistor R105, a capacitor C326, a capacitor C327, a capacitor C328, a capacitor C330, a capacitor C331 and a capacitor C329, the first pin of the AMS117-ADJ chip is respectively connected to one end of the resistor R104 and one end of the resistor R105, the other end of the resistor R105 is grounded, the other end of the resistor R104 is respectively connected to the second pin and the fourth pin of the AMS117-ADJ chip, the other end of the resistor R104 is also connected to one end of the capacitor C326, one end of the capacitor C327 and one end of the capacitor C328, the other ends of the capacitors C326, C327 and C328 are grounded, the third pin of the AMS117-ADJ chip is respectively connected to one end of the capacitor C330, one end of the capacitor C331 and one end of the capacitor C329, the other ends of the capacitors C330, C331 and C329 are grounded.

[0038] The first voltage conversion module also includes an inductor L1, the third pin of the TMI3108 chip is connected to the inductor L1, the fifth pin of the TMI3108 chip is respectively connected to the capacitor C335, the resistor R107 and the resistor R108, the other end of the resistor R108 is grounded, the other end of the resistor R107 is connected to the other end of the capacitor C335 and then connected to one end of the capacitor C337 and the capacitor C336 respectively, the other ends of the capacitor C337 and the capacitor C336 are grounded, the fourth pin of the TMI3108 chip is respectively connected to VBUS, one end of the capacitor C333 and one end of the capacitor C332, the first pin is respectively connected to one end of the resistor R106 and one end of the capacitor C334, the other end of the resistor R106 is connected to the 3.3V power supply, the other end of the capacitor C334 is grounded, and the other end of the capacitor C333 and the other end of the capacitor C332 are grounded.

[0039] The present invention also provides an electronic device, comprising the interface conversion circuit described in any of the above embodiments, and also comprising a display screen, wherein the interface conversion circuit is connected to the display screen, and the display screen has an HDMI interface for displaying an HDMI signal received from the interface conversion circuit.

[0040] It can be understood that the contents of the above method embodiments are all applicable to the electronic device embodiment, the functions specifically implemented by the electronic device embodiment are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0041] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0042] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.

Claims

1. An interface conversion circuit, characterized in that: The circuit includes an audio codec, a USB audio input interface, a LT2611UXC chip, an LVDS audio input interface, and an HDMI output interface. The USB audio input interface is connected to the input end of the audio codec, the output end of the audio codec is connected to the LT2611UXC chip, the LT2611UXC chip is also connected to the LVDS audio input interface and the HDMI output interface, the LT2611UXC chip is an LVDS to HDMI2.0 converter, the audio codec is used to convert the input USB audio signal into an IIS audio signal and transmit it to the LT2611UXC chip, and the LT2611UXC chip converts the IIS audio signal and the LVDS audio signal received from the LVDS audio input interface into an HDMI signal and outputs it from the HDMI output interface.

2. The interface conversion circuit according to claim 1, characterized in that: The audio codec adopts the ALC4050 chip.

3. The interface conversion circuit according to claim 1, characterized in that: The LVDS audio input interface includes a first LVDS audio input interface and a second LVDS audio input interface.

4. The interface conversion circuit according to claim 1, characterized in that: The circuit also includes a power supply module and a voltage conversion module. The power supply module is used to provide power to the circuit. The voltage conversion module is connected to the power supply module and is used to convert the power into a first voltage to power the circuit.

5. The interface conversion circuit according to claim 4, characterized in that: The voltage conversion module includes a first voltage conversion module and a second voltage conversion module. The first voltage conversion module is used to convert the power supply into a first voltage to power the circuit, and the second voltage conversion module is used to convert the power supply into a second voltage to power the circuit.

6. The interface conversion circuit according to claim 5, characterized in that: The first voltage conversion module includes a TMI3108 chip.

7. The interface conversion circuit according to claim 5, characterized in that: The second voltage conversion module includes an AMS117-ADJ chip.

8. The interface conversion circuit according to claim 7, characterized in that: The second voltage conversion module also includes a resistor R104, a resistor R105, a capacitor C326, a capacitor C327, a capacitor C328, a capacitor C330, a capacitor C331 and a capacitor C329. The first pin of the AMS117-ADJ chip is respectively connected to one end of the resistor R104 and one end of the resistor R105, and the other end of the resistor R105 is grounded. The other end of the resistor R104 is respectively connected to the second pin and the fourth pin of the AMS117-ADJ chip, and the other end of the resistor R104 is also connected to one end of the capacitor C326, one end of the capacitor C327 and one end of the capacitor C328. The third pin of the AMS117-ADJ chip is respectively connected to one end of the capacitor C330, one end of the capacitor C331 and one end of the capacitor C329, and the other ends of the capacitors C330, C331 and C329 are grounded.

9. The interface conversion circuit according to claim 6, characterized in that: The first voltage conversion module also includes an inductor L1, and the third pin of the TMI3108 chip is connected to the inductor L1.

10. An electronic device, characterized in that: It comprises the interface conversion circuit according to any one of claims 1 to 9, and also comprises a display screen, wherein the interface conversion circuit is connected to the display screen, and the display screen has an HDMI interface for displaying an HDMI signal received from the interface conversion circuit.

Images