CN108848333B - Signal conversion module and mobile terminal - Google Patents
Signal conversion module and mobile terminal Download PDFInfo
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- CN108848333B CN108848333B CN201810861979.XA CN201810861979A CN108848333B CN 108848333 B CN108848333 B CN 108848333B CN 201810861979 A CN201810861979 A CN 201810861979A CN 108848333 B CN108848333 B CN 108848333B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/268—Signal distribution or switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
- H04N5/77—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera
Abstract
The application relates to a signal conversion module and a mobile terminal, wherein the signal conversion module comprises a signal conversion chip and a high-definition multimedia interface, and the signal conversion chip is connected with the high-definition multimedia interface; when the external equipment is connected to the high-definition multimedia interface, the signal conversion chip receives high-definition multimedia interface audio and video signals transmitted by the external equipment, converts the high-definition multimedia interface audio and video signals into mobile industry processor interface audio and video signals, sends the mobile industry processor interface audio and video signals to the external mobile terminal main control chip, and generates audio and video data according to the mobile industry processor interface audio and video signals. The mobile terminal comprises a main control chip and a signal conversion module. The signal conversion module or the mobile terminal can effectively improve the transmission rate of the high-definition multimedia interface audio/video signals.
Description
Technical Field
The invention relates to the technical field of internet, in particular to a signal conversion module and a mobile terminal.
Background
With the development of science and technology, various intelligent devices such as smart phones and tablet computers are developed, so that the production and living modes of people are greatly changed, and people can transmit and share data through the smart phones, the tablet computers and other devices.
A smart phone, a tablet computer, and the like mostly use a USB (Universal Serial Bus) Interface, a Mini USB Interface, and other wireless interfaces to perform data transmission with an external device based on an MIPI (Mobile Industry Processor Interface). MIPI is an open standard and a specification established by the MIPI alliance for mobile application processors. The traditional data transmission mode has the problem of too low transmission rate when transmitting high-definition audio and video data.
Disclosure of Invention
In view of the above, it is necessary to provide a signal conversion module and a mobile terminal with high transmission rate.
A signal conversion module comprises a signal conversion chip and a high-definition multimedia interface, wherein the signal conversion chip is connected with the high-definition multimedia interface;
when the external equipment is connected with the high-definition multimedia interface, the signal conversion chip receives high-definition multimedia interface audio and video signals transmitted by the external equipment, converts the high-definition multimedia interface audio and video signals into mobile industry processor interface audio and video signals, sends the mobile industry processor interface audio and video signals to the external mobile terminal main control chip, and generates audio and video data according to the mobile industry processor interface audio and video signals.
In one embodiment, the signal conversion chip is further configured to trigger a hardware interrupt of the signal conversion chip when the external device is connected to the high-definition multimedia interface, and the signal conversion chip receives an audio/video signal of the high-definition multimedia interface transmitted by the external device in response to the hardware interrupt.
In one embodiment, the signal conversion chip is further configured to obtain extended display identification data of the external device, send a data request to the external device according to the extended display identification data, and receive a high-definition multimedia interface audio/video signal fed back by the external device according to the data request.
In one embodiment, the signal conversion chip is a TC358743 chip.
In one embodiment, the signal conversion chip is further configured to obtain a parallel signal of each data channel of the high-definition multimedia interface and a clock signal of the clock channel, perform synchronous processing on the parallel signal based on the clock signal, and decode the signal after the synchronous processing to obtain an audio/video signal of the interface of the mobile industry processor.
The signal conversion module is connected to external equipment through a high-definition multimedia interface, the external equipment transmits high-definition multimedia interface audio and video signals to the signal conversion chip, the signal conversion chip converts the high-definition multimedia interface audio and video signals into mobile industry processor interface audio and video signals, and the external mobile terminal main control chip generates audio and video data according to the mobile industry processor interface audio and video signals.
A mobile terminal comprises a main control chip and any one of the signal conversion modules, wherein the signal conversion chip in the signal conversion module is connected with the main control chip, and the main control chip is used for receiving an audio/video signal of a mobile industry processor interface and generating audio/video data according to the audio/video signal of the mobile industry processor interface.
In one embodiment, the mobile terminal further comprises a camera serial interface connected with the main control chip, and the main control chip is further used for expanding a camera frame corresponding to the camera serial interface and generating audio and video data according to the expanded camera frame and the audio and video signals of the mobile industry processor interface.
In one embodiment, the main control chip is further configured to store audio and video data.
In one embodiment, the mobile terminal further comprises a communication module, and the main control chip is connected with the signal conversion chip through the communication module.
In one embodiment, the communication module includes an I2C bus.
The mobile terminal is connected to external equipment through a high-definition multimedia interface, the external equipment transmits high-definition multimedia interface audio and video signals to the signal conversion chip, the signal conversion chip converts the high-definition multimedia interface audio and video signals into mobile industry processor interface audio and video signals, the main control chip generates audio and video data according to the mobile industry processor interface audio and video signals, and the high-definition multimedia interface is adopted to transmit the high-definition multimedia interface audio and video signals and has higher transmission rate, so that the transmission rate of the high-definition multimedia interface audio and video signals can be effectively improved.
Drawings
FIG. 1 is a block diagram of a signal conversion module in one embodiment;
FIG. 2 is a block diagram of a mobile terminal in one embodiment;
fig. 3 is a diagram illustrating an application scenario of the mobile terminal according to an embodiment.
Detailed Description
As shown in fig. 1, a signal conversion module includes a signal conversion chip 100 and a high definition multimedia interface 200, wherein the signal conversion chip 100 is connected to the high definition multimedia interface 200; when the external device is connected to the high-definition multimedia interface 200, the signal conversion chip 100 receives a high-definition multimedia interface audio/video signal transmitted by the external device, converts the high-definition multimedia interface audio/video signal into a mobile industry processor interface audio/video signal, and transmits the mobile industry processor interface audio/video signal to an external mobile terminal main control chip, and the external mobile terminal main control chip generates audio/video data according to the mobile industry processor interface audio/video signal.
HDMI (High Definition Multimedia Interface) is a specialized digital Interface for video transmission. The HDMI can not only meet the resolution of 1080P, but also support Digital Audio formats such as DVD Audio (Digital Versatile Disc-Audio, Digital Audio compact Disc) and the like, support eight-channel 96kHz or stereo 192kHz Digital Audio transmission, transmit uncompressed Audio signals and video signals, access high-definition Audio and video data through a high-definition multimedia interface, and the transmission rate of the high-definition multimedia interface is up to 48 Gbps. The signal conversion chip is used for converting the high-definition multimedia interface audio/video signals into the mobile industry processor interface audio/video signals. The MIPI (Mobile Industry Processor Interface) is an open standard and a specification established for a Mobile application Processor initiated by the MIPI alliance, and a Mobile terminal main control chip cannot directly perform data processing on an HDMI signal, but can directly perform data processing on an MIPI signal.
The signal conversion module is connected to external equipment through a high-definition multimedia interface, the external equipment transmits high-definition multimedia interface audio and video signals to the signal conversion chip, the signal conversion chip converts the high-definition multimedia interface audio and video signals into mobile industry processor interface audio and video signals, and the external mobile terminal main control chip generates audio and video data according to the mobile industry processor interface audio and video signals.
In one embodiment, the signal conversion chip is further configured to trigger a hardware interrupt of the signal conversion chip when the external device is connected to the high-definition multimedia interface, and the signal conversion chip receives an audio/video signal of the high-definition multimedia interface transmitted by the external device in response to the hardware interrupt. The signal conversion chip can be configured through the main control chip to provide normal working conditions for the signal conversion chip, and when the signal conversion chip is connected with the high-definition multimedia interface through the external equipment, hardware interruption occurs to receive audio and video signals of the high-definition multimedia interface transmitted by the external equipment. For example, a detection state bit may be set for the signal conversion chip, and when the external device is connected to the high-definition multimedia interface, the detection state bit outputs 1; otherwise, 0 is output. A hardware interrupt is an asynchronous signal indicating that attention is needed or that a change is needed to re-execute a synchronous event. A hardware interrupt is a polling loop that avoids wasting processing time while waiting for an external event.
In one embodiment, the signal conversion chip is further configured to obtain extended display identification data of the external device, send a data request to the external device according to the extended display identification data, and receive a high-definition multimedia interface audio/video signal fed back by the external device according to the data request. EDID (Extended Display Identification Data) is a VESA (Video Electronics Standards Association) standard Data format, and includes parameters related to a monitor and its performance, specifically including vendor information, a maximum image size, color settings, vendor preset, a limit of a frequency range, and a character string of a Display name and a serial number.
In one embodiment, the signal conversion chip is a TC358743 chip. The TC358743 chip is a chip capable of converting HDMI signals into MIPI CSI2, and the highest resolution supports 1920 × 1200. The MIPI framework includes a Camera standard and a Display standard, which respectively correspond to a MIPI CSI (Camera Serial Interface) and a MIPI DSI (Display Serial Interface), and the CSI 2.0 version is an MIPI CSI2 Interface. The CSI is used for a camera, and the DSI is used for liquid crystal module display. The TC358743 needs to be matched with a main control chip, the main control chip requires to input MIPI CSI, and meanwhile, the TC358743 chip can be controlled through I2C. The TC358743 and the main control chip may be connected through MIPI CSI, I2S (Inter-IC Sound, audio bus built in integrated circuit), I2C signals. The signal of the MIPI CSI is used for transmitting a video signal, the signal I2S is used for transmitting an audio signal, and the signal I2C is used for controlling the chip TC 358743. Meanwhile, the TC358743 chip needs one clock input, so that a 26M active crystal needs to be added. The main control chip controls the reset and interrupt input of the TC358743 chip, the TC358743 chip needs to meet the timing requirement, so the reset pin and the power switch of the TC358743 are controlled by the main control chip, the TC358743 does not need to be powered off after being started, the power is controlled to enter the sleep mode through the I2C, and the power consumption is in the uW level.
In one embodiment, the signal conversion chip is further configured to obtain a parallel signal of each data channel of the high-definition multimedia interface and a clock signal of the clock channel, perform synchronous processing on the parallel signal based on the clock signal, and decode the signal after the synchronous processing to obtain an audio/video signal of the interface of the mobile industry processor. The HDMI channel comprises a data channel for transmitting RGB signals and a clock channel for transmitting clock signals, and the signal conversion chip controls the clock period through the HDMI and aligns parallel data of the data channels of the HDMI. Specifically, according to the fixed coding sequence of the HDMI clock period, the data of each data channel is aligned, and then each data channel is controlled to enter the control period at the same time, so that the data of each channel is synchronized.
In one embodiment, the signal conversion chip is further used for storing the mobile industry processor interface audio/video signal. The signal conversion chip converts the high-definition multimedia interface audio/video signals into mobile industry processor interface audio/video signals and stores the signals, and when the main control chip sends a data request, the signal conversion chip responds to the request and sends the corresponding mobile industry processor interface audio/video signals to the main control chip, such as the audio/video signals in a certain time period.
A mobile terminal, as shown in fig. 2, includes a main control chip 300 and a signal conversion module, where the signal conversion chip 100 in the signal conversion module is connected to the main control chip 300, and the main control chip 300 is configured to receive an audio/video signal of a mobile industry processor interface and generate audio/video data according to the audio/video signal of the mobile industry processor interface.
The signal conversion module comprises a signal conversion chip and a high-definition multimedia interface, and the signal conversion chip is respectively connected with the high-definition multimedia interface and the main control chip. The external equipment transmits the high-definition multimedia interface audio/video signals to the signal conversion chip, and the signal conversion chip converts the high-definition multimedia interface audio/video signals into mobile industry processor interface audio/video signals and sends the signals to the main control chip.
The mobile terminal is connected to external equipment through a high-definition multimedia interface, the external equipment transmits high-definition multimedia interface audio and video signals to the signal conversion chip, the signal conversion chip converts the high-definition multimedia interface audio and video signals into mobile industry processor interface audio and video signals, the main control chip generates audio and video data according to the mobile industry processor interface audio and video signals, and the high-definition multimedia interface is adopted to transmit the high-definition multimedia interface audio and video signals and has higher transmission rate, so that the transmission rate of the high-definition multimedia interface audio and video signals can be effectively improved.
In one embodiment, the mobile terminal further comprises a camera serial interface connected with the main control chip, and the main control chip is further used for expanding a camera frame corresponding to the camera serial interface and generating audio and video data according to the expanded camera frame and the audio and video signals of the mobile industry processor interface.
In one embodiment, the main control chip is further configured to store audio and video data. For example, a user may input a video request through a user operation interface of a smart phone or a tablet computer, and the main control chip analyzes the video request input through the user operation interface and feeds back corresponding audio and video data to the user display interface.
In one embodiment, the mobile terminal further comprises a communication module, and the main control chip is connected with the signal conversion chip through the communication module. The communication module can realize data circulation between the main control chip and the signal conversion chip, and the communication module can comprise a wireless communication module and a wired communication module.
In one embodiment, the communication module includes an I2C bus. The I2C bus is a simple, bidirectional two-wire synchronous serial bus that requires only two wires to transfer information between devices connected to the bus. The 12C bus only needs two lines of a data line and a clock line on the hardware, the bus interface is integrated in the chip, a special interface circuit is not needed, the I2C bus can simplify the wiring of the hardware circuit, reduce the cost and improve the reliability. The I2C bus also has the advantages of extremely low current consumption, high noise interference resistance, compatibility with devices of different voltage levels, wide working temperature range and the like.
In one embodiment, the mobile terminal comprises a main control chip, a signal conversion chip TC358743, an HDMI interface and an I2C bus, wherein the main control chip configures the TC358743 chip through the I2C bus, so that the TC358743 chip works normally. When the TC358743 chip detects that the external device is inserted into the HDMI interface, reporting EDID of the external device is triggered, and requesting the external device to output a supported HDMI signal according to the EDID of the external device. The TC358743 chip receives the HDMI signals, converts the HDMI signals into MIPI signals and sends the MIPI signals to the main control chip. The mobile terminal converts video signals through an HDMI to MIPI chip on hardware, virtualizes HDMI input into camera equipment through expanding a standard camera frame on software, achieves the purpose that the HDMI input is brought into the standard camera frame, can achieve functions of previewing, photographing, recording and the like in the application of a native camera of the mobile terminal, and accordingly enables the mobile terminal to have an HDMI audio and video input function. The virtually generated camera follows an android framework, namely, an upper application interacts with a HAL (Hardware Abstraction Layer), a custom management strategy is realized in the HAL Layer, and a perceived bottom Layer drive is realized in an operating system Kernel. The bottom layer setting of core perception, ISP (Internet Service Provider) effect and the like are independently extracted and managed in one process.
As shown in fig. 3, taking a smart phone as an example of a mobile terminal, the smart phone can be used to view video contents of a recording device with an HDMI interface, such as a camera, a notebook computer, and a desktop computer, at any time and any place.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A signal conversion module is characterized by comprising a signal conversion chip and a high-definition multimedia interface, wherein the signal conversion chip is connected with the high-definition multimedia interface;
when an external device is connected to the high-definition multimedia interface, the signal conversion chip receives a high-definition multimedia interface audio/video signal transmitted by the external device, converts the high-definition multimedia interface audio/video signal into a mobile industry processor interface audio/video signal, and sends the mobile industry processor interface audio/video signal to an external mobile terminal main control chip; the external mobile terminal main control chip generates audio and video data according to the audio and video signals of the mobile industry processor interface; the signal conversion chip synchronously processes the parallel signals according to a fixed coding sequence of a high-definition multimedia interface starting clock period, and decodes the synchronously processed signals to obtain the audio and video signals of the interface of the mobile industry processor; the signal conversion chip is also used for triggering hardware interruption of the signal conversion chip when external equipment is connected to the high-definition multimedia interface, and the signal conversion chip responds to the hardware interruption and receives high-definition multimedia interface audio and video signals transmitted by the external equipment; the signal conversion chip is also used for storing the mobile industry processor interface audio and video signals, responding to the request when the external mobile terminal main control chip sends out a data request, and sending the corresponding mobile industry processor interface audio and video signals to the external mobile terminal main control chip.
2. The signal conversion module of claim 1, wherein the signal conversion chip is further configured to trigger a hardware interrupt of the signal conversion chip when an external device is connected to the high-definition multimedia interface, and the signal conversion module comprises:
configuring the signal conversion chip by the external equipment main control chip, setting a detection state bit for the signal conversion chip, and outputting 1 by the detection state bit when the external equipment is connected to the high-definition multimedia interface; otherwise, 0 is output.
3. The signal conversion module of claim 1, wherein the signal conversion chip is further configured to obtain extended display identification data of the external device, send a data request to the external device according to the extended display identification data, and receive a high-definition multimedia interface audio/video signal fed back by the external device according to the data request.
4. The signal conversion module of claim 1, wherein the signal conversion chip is a TC358743 chip.
5. The signal conversion module of claim 1, wherein the signal conversion chip is further configured to obtain a parallel signal of each data channel of the high-definition multimedia interface and a clock signal of a clock channel.
6. A mobile terminal is characterized by comprising a main control chip and the signal conversion module according to any one of claims 1 to 5, wherein the signal conversion chip in the signal conversion module is connected with the main control chip, and the main control chip is used for receiving the audio/video signals of the interface of the mobile industry processor and generating audio/video data according to the audio/video signals of the interface of the mobile industry processor.
7. The mobile terminal according to claim 6, further comprising a camera serial interface connected to the main control chip, wherein the main control chip is further configured to extend a camera frame corresponding to the camera serial interface, and generate audio/video data according to the extended camera frame and the audio/video signal of the mobile industry processor interface.
8. The mobile terminal of claim 6, wherein the main control chip is further configured to store the audio/video data.
9. The mobile terminal of claim 6, further comprising a communication module, wherein the main control chip is connected to the signal conversion chip through the communication module.
10. The mobile terminal of claim 9, wherein the communication module comprises an I2C bus.
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| CN109753184A (en) * | 2019-01-07 | 2019-05-14 | 北京硬壳科技有限公司 | Touch control display device and its control method and device |
| CN110300221B (en) * | 2019-05-20 | 2021-06-25 | 努比亚技术有限公司 | MIPI control circuit and system, circuit control and circuit system control method, terminal and computer readable storage medium |
| CN110392217A (en) * | 2019-07-01 | 2019-10-29 | 深圳市显盈科技股份有限公司 | A kind of multifunctional signal conversion circuit and multifunctional signal converting system |
| CN113473059A (en) * | 2020-05-27 | 2021-10-01 | 海信集团有限公司 | Data processing method, intelligent device and intelligent processing system |
| CN112383732B (en) * | 2020-12-09 | 2023-08-04 | 上海移远通信技术股份有限公司 | Resolution adaptive signal transmission system and method |
| CN115348407A (en) * | 2021-05-14 | 2022-11-15 | 海信集团控股股份有限公司 | Electronic equipment, video streaming transmission method and equipment |
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