CN104378666A - Audio/video encoding and decoding device based on MOST bus and method - Google Patents
Audio/video encoding and decoding device based on MOST bus and method Download PDFInfo
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- CN104378666A CN104378666A CN201410615023.3A CN201410615023A CN104378666A CN 104378666 A CN104378666 A CN 104378666A CN 201410615023 A CN201410615023 A CN 201410615023A CN 104378666 A CN104378666 A CN 104378666A
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- audio
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
- H04N21/41422—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance located in transportation means, e.g. personal vehicle
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
Abstract
The invention provides an audio/video encoding and decoding device based on an MOST bus and a method and belongs to the field of audio/video encoding and decoding. The audio/video encoding and decoding device comprises an MOST interface module, an audio encoding and decoding module, an audio input and output module, a microprocessor, a video encoding and decoding module and a video transmission module, wherein the audio input and output module, the microprocessor and the video encoding and decoding module are connected with the audio encoding and decoding module, and the video transmission module is connected with the video encoding and decoding module. The MOST interface module is connected with a microcontroller, the audio encoding and decoding module and the video encoding and decoding module. The microprocessor controls the MOST interface module, the audio encoding and decoding module and the video encoding and decoding module. The audio/video encoding and decoding device is simple in structure, reasonable in design and convenient to obtain, a vehicle factory does not need to spend a great deal of time or cost in developing vehicle-mounted terminals, and only the MOST bus supported by the device needs to be additionally arranged on an original terminal device.
Description
Technical field
The present invention relates to audio/video encoding/decoding field, particularly relate to a kind of based on MOST bus audio/video encoding/decoding device and method.
Background technology
System transfers (Media Oriented Systems Transport, MOST) towards media is a kind of network standard of more and more being praised highly in automaker and supplier.It providing the single interface that can manage all multimedia equipments, its surging place, be to process the multiple data flow for different target, and it is humorous not become estranged.
MOST bus is as a kind of vehicle mounted multimedia network-bus, the transfer of data of primary responsibility car entertainment information and telematics device, constantly MOST bussing technique is applied along with in domestic and international depot, MOST bus interface car-mounted terminal (such as: middle control main frame, power amplifier, Digital Television etc.) is not originally with to need again to develop, construction cycle is long, development cost is expensive, and technical risk is larger.
Summary of the invention
For solving problems of the prior art, the invention provides a kind of based on MOST bus audio/video encoding/decoding device.
The video transmission module that the present invention includes MOST interface module, audio coding decoding module and the audio frequency input/output module be connected with described audio coding decoding module, microprocessor, coding and decoding video module and be connected with described coding and decoding video module, described MOST interface module respectively with described microcontroller, audio coding decoding module and coding and decoding video model calling, described microprocessor controls described MOST interface module, described audio coding decoding module and described coding and decoding video module respectively.
The present invention makes further improvements, the external MOST bus of described MOST interface module, described audio frequency input/output module and the external car-mounted terminal of described video transmission module.
The present invention makes further improvements, and described audio coding decoding module is digital-to-analogue or analog-to-digital conversion module, and described video transmission module is LVDS transport module.
The present invention makes further improvements, and described MOST interface module comprises MOST bus intelligent controller module, integrated circuit built-in audio bus interface and multimedia local bus interface, supports MOST50 and/or MOST150.
The present invention makes further improvements, and described microprocessor is provided with multipath I 2 C passage and MOST agreement middleware is loaded in flash space.
Present invention also offers a kind of method based on MOST bus audio coding, comprise the steps:
A1: receive the audio-video source step on car-mounted terminal based on MOST bus audio/video encoding/decoding device;
A2: audio-video source transmitting step;
A3: audio/video coding step;
A4:MOST interface transfer step;
A5: send to MOST bus step based on MOST bus audio/video encoding/decoding device.
The present invention makes further improvements, and described coding is realized by microprocessor Program.
Present invention also offers a kind of method based on MOST bus audio decoder, comprise the steps:
B1: receive audio-video source step in MOST bus based on MOST bus audio/video encoding/decoding device;
B2:MOST interface transfer step;
B3: audio-video source decoding step;
B4: audio video transmission step;
B5: send to car-mounted terminal step based on MOST bus audio/video encoding/decoding device.
The present invention makes further improvements, and described decoding is realized by microprocessor Program.
Compared with prior art, the invention has the beneficial effects as follows: structure is simple, reasonable in design, realization is convenient, depot does not need to spend a lot of time and cost exploitation car-mounted terminal, and only need add apparatus of the present invention on original terminal equipment can support MOST bus.
Accompanying drawing explanation
Fig. 1 is for the present invention is based on MOST bus audio/video encoding/decoding device structural representation;
Fig. 2 is the method flow diagram that the present invention is based on MOST bus audio/video coding;
Fig. 3 is the method flow diagram that the present invention is based on MOST bus audio/video decoding.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further details.
As shown in Figure 1, the video transmission module that the present invention includes MOST interface module, audio coding decoding module and the audio frequency input/output module be connected with described audio coding decoding module, microprocessor, coding and decoding video module and be connected with described coding and decoding video module, described MOST interface module respectively with described microcontroller, audio coding decoding module and coding and decoding video model calling, described microprocessor controls described MOST interface module, described audio coding decoding module and described coding and decoding video module respectively.
The external MOST bus of described MOST interface module, described audio frequency input/output module and the external car-mounted terminal of described video transmission module.MOST bus, as the receiving terminal of audio, video data and transmitting terminal, is connected with the MOST interface module of MOST box by MOST bus interface; Car-mounted terminal comprises car loudspeaker, Vehicular display device etc., for audio frequency and video of the present invention display the play terminal and need upload audio-video source at cataloged procedure.
Be respectively based on the function of MOST bus audio/video encoding/decoding device (hereinafter referred to as MOST box) each module and purposes:
MOST interface module: comprise MOST bus intelligent controller module, can support MOST50 and/or MOST150, with i2s bus (integrated circuit built-in audio bus) interface and MLB bus (multimedia local bus) interface.
Audio coding decoding module: both comprised audio digital signals input modulating output (D/A) transducer, comprises again audio analog signals input numeral and exports (A/D) transducer.
Audio frequency input/output module: download audio frequency to vehicle-mounted playback terminal from MOST bus, or send car-mounted terminal audio data sources to MOST bus.
Video transmission module, both decoded video data transmission can be shown to display terminal, can encode to coding module needing the video signal transmission uploaded again, usually adopting LVDS(and Low Voltage Differential Signaling, is a kind of Low Voltage Differential Signal) transmission.
Coding and decoding video: video data is converted to i2s(Inter-IC Sound by MLB signal) signal and rgb signal, or phase shaft video data encoding becomes MLB signal to upload to network.
Microprocessor: be provided with multipath I 2 C passage, comprises enough flash spaces and loads MOST agreement middleware.
The workflow of apparatus of the present invention is as follows:
Audio/video coding is sent to MOST bus workflow:
First, local multimedia audio and video, as MOST bus independent play-out source, MOST bus are divided into two sources, audio-source and video source, by No. ID, the customed source of MOST bus management, initiatively report oneself source ID signal to network Master.Need to connect local audio-video source once other destination nodes of network (such as power amplifier, display screen), local audio converts i2s (Inter-IC Sound) signal to network intelligence processor by A/D module; Same local video converts MLB signal to network intelligence processor by hardware encoding; Destination is transferred to again by network intelligence processor.
Audio/video decoding is to local workflow:
MOST box has audio/video encoding/decoding module, once MOST bus has after multimedia audio-video signal comes, audio frequency can pass through audio coding decoding module (D/A, or A/D, single instrument analog-to-digital conversion) convert PCM(pulse code modulation Pulse Code Modulation to) signal directly can export to loudspeaker; Video council becomes rgb signal by hardware decode module converts, then by LVDS Signal transmissions to display screen.
As shown in Figures 2 and 3, the method that the present invention is based on MOST bus audio/video encoding/decoding is divided into audio/video coding and audio/video decoding two parts according to function.
The workflow of audio/video coding as shown in Figure 2, comprises following steps:
A1: receive the audio-video source step on car-mounted terminal based on MOST bus audio/video encoding/decoding device;
A2: audio-video source transmitting step;
A3: audio/video coding step;
A4:MOST interface transfer step;
A5: send to MOST bus step based on MOST bus audio/video encoding/decoding device.
Specific implementation flow process is: MOST box receives the audio-video source (A1 step) on car-mounted terminal, video source passes through video transmission module, video source is converted to LVDS signal, and then be transferred to coding and decoding video chip (A2 step), coding and decoding video chip is by becoming MLB(Media Local Bus by LVDS Signal coding, multimedia local bus) signal is sent to MOST interface module (A3 step), and vision signal is sent to MOST bus (A4 step and A5 step) by twisted-pair feeder or optical fiber by last MOST interface module; Local audio sends to audio coding decoding module (A2 step) by input/output module, audio coding decoding module (A/D conversion) converts audio-source to I2S digital audio, be sent to MOST interface module (A3 step) again, audio frequency is sent to MOST bus (A4 step and A5 step) by twisted-pair feeder or optical fiber by same MOST interface module.
The workflow of audio/video decoding as shown in Figure 3, comprises following steps:
B1: receive audio-video source step in MOST bus based on MOST bus audio/video encoding/decoding device;
B2:MOST interface transfer step;
B3: audio/video decoding step;
B4: audio video transmission step;
B5: send to car-mounted terminal step based on MOST bus audio/video encoding/decoding device.
Specific implementation flow process is:
MOST box receives the audio-video source (B1 step) in MOST bus, in MOST bus, video source sends coding and decoding video module (B2 step) to by MOST interface module, coding and decoding video module converts video source to MLB signal, be sent to video transmission module (B3 step) again, MLB signal is converted into LVDS signal by video transmission module, and then LVDS Signal transmissions is to local display (B4 and B5 step); Audio-source in MOST bus sends audio coding decoding module (B2 step) to by MOST interface module, audio-source is converted to PCM signal (B3 step) by audio coding decoding module (D/A conversion), is then sent to local loudspeaker and exports (B4 and B5 step).
The realization flow of above encoding and decoding, is all realized by microprocessor Program.
The embodiment of the above is better embodiment of the present invention; not limit specific embodiment of the invention scope with this; scope of the present invention comprises and is not limited to this embodiment, and all equivalence changes done according to the present invention are all in protection scope of the present invention.
Claims (9)
1. one kind based on MOST bus audio/video encoding/decoding device, it is characterized in that: the video transmission module comprising MOST interface module, audio coding decoding module and the audio frequency input/output module be connected with described audio coding decoding module, microprocessor, coding and decoding video module and be connected with described coding and decoding video module, described MOST interface module respectively with described microcontroller, audio coding decoding module and coding and decoding video model calling, described microprocessor controls described MOST interface module, described audio coding decoding module and described coding and decoding video module respectively.
2. according to claim 1 based on MOST bus audio/video encoding/decoding device, it is characterized in that: the external MOST bus of described MOST interface module, described audio frequency input/output module and the external car-mounted terminal of described video transmission module.
3. according to claim 1 based on MOST bus audio/video encoding/decoding device, it is characterized in that: described audio coding decoding module is digital-to-analogue or analog-to-digital conversion module, described video transmission module is LVDS transport module.
4. according to claim 1 based on MOST bus audio/video encoding/decoding device, it is characterized in that: described MOST interface module comprises MOST bus intelligent controller module, integrated circuit built-in audio bus interface and multimedia local bus interface, support MOST50 and/or MOST150.
5. according to claim 1 based on MOST bus audio/video encoding/decoding device, it is characterized in that: described microprocessor is provided with multipath I 2 C passage and MOST agreement middleware is loaded in flash space.
6. realize the method for any one of claim 1-5 based on MOST bus audio coding, comprise the steps:
A1: receive the audio-video source step on car-mounted terminal based on MOST bus audio/video encoding/decoding device;
A2: audio-video source transmitting step;
A3: audio/video coding step;
A4:MOST interface transfer step;
A5: send to MOST bus step based on MOST bus audio/video encoding/decoding device.
7. the method based on MOST bus audio/video coding according to claim 6, is characterized in that: described audio/video coding is realized by microprocessor Program.
8. realize the method for any one of claim 1-5 based on MOST bus audio/video decoding, comprise the steps:
B1: receive audio-video source step in MOST bus based on MOST bus audio/video encoding/decoding device;
B2:MOST interface transfer step;
B3: audio/video decoding step;
B4: audio video transmission step;
B5: send to car-mounted terminal step based on MOST bus audio/video encoding/decoding device.
9. the method based on MOST bus audio/video decoding according to claim 8, is characterized in that: described audio/video decoding is realized by microprocessor Program.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410615023.3A CN104378666A (en) | 2014-11-05 | 2014-11-05 | Audio/video encoding and decoding device based on MOST bus and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410615023.3A CN104378666A (en) | 2014-11-05 | 2014-11-05 | Audio/video encoding and decoding device based on MOST bus and method |
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| CN104378666A true CN104378666A (en) | 2015-02-25 |
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| CN201410615023.3A Pending CN104378666A (en) | 2014-11-05 | 2014-11-05 | Audio/video encoding and decoding device based on MOST bus and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3300309A1 (en) * | 2016-09-26 | 2018-03-28 | Delphi Technologies, Inc. | Test assembly for a data transmission system and method of testing said system |
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Cited By (1)
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| EP3300309A1 (en) * | 2016-09-26 | 2018-03-28 | Delphi Technologies, Inc. | Test assembly for a data transmission system and method of testing said system |
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Application publication date: 20150225 |