CN1916883A - Embedded platform for developing audio and video - Google Patents
Embedded platform for developing audio and video Download PDFInfo
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- CN1916883A CN1916883A CN 200610030752 CN200610030752A CN1916883A CN 1916883 A CN1916883 A CN 1916883A CN 200610030752 CN200610030752 CN 200610030752 CN 200610030752 A CN200610030752 A CN 200610030752A CN 1916883 A CN1916883 A CN 1916883A
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Abstract
A development platform of audio-video embedded type consists of audio-video signal source, various data communication interface, liquid crystal display screen, external bus of standard system, large capacity of programmable component and NisoII software management system. It can be used to carry out secondary development on digital video-audio embedded system and to carry out development of embedded software.
Description
Technical field
The present invention relates to a kind of embedded platform for developing audio and video, this platform has perfect video, audio frequency and various user data interface, and decoration structure features simple design carries 15 cun LCDs.This platform can be used as digital video Audio Processing experiment porch, finishes experiment or teaching demonstration function; Secondly can utilize the modular system that the user is opened to external bus and rich data interfaces, carry out the secondary development of digital video audio embedded type system based on this platform; In addition, can also utilize the programmable features of system, on the basis that does not change hardware, carry out the prototype design work of special-purpose embedded software developing or video/audio product.
Background technology
The digital video-audio industry is as one of great ingredient of electronics and information industry, and growth momentum in recent years can not be underestimated.Data prediction is arranged, and by 2008, Chinese digital video-audio industry annual value of production will reach 9,000 hundred million yuan, surpass communications industry and leap to the information industry first place; And by 2010, look the audio frequency industry and will reach 1.5 trillion yuan, become the first pillar of national economy; Simultaneously, the traditional microprocessing unit (MCU) and standard digital logical circuit (ASSP) the supplier market share descend year by year, the more massive application of field programmable device (FPGA) meeting, and the FPGA support facility of updating, make Embedded System Design pulling speed based on fpga chip, the embedded system EDA platform based on FPGA occurred, from popularizing on the meaning, its appearance makes based on FPGA design embedded system becomes possibility.Along with the proposition of programmable system on chip (SOPC) notion, promoted the method and the intension of Embedded System Design from software and hardware two aspects in recent years; And the proposition of the soft nuclear of Niosll has been satisfied embedded system to the two programmable demands of soft or hard nuclear, so embedded system technology has also entered soft nuclear (Soft Core) epoch thereupon.
But present various embedded system development plates, be based on the learning board of more low-grade processor chips, can only do some simple programming study, can't look the audio frequency exploitation, if the learning board of high-grade processor chips based on the comparison, then interface is all abundant inadequately, video particularly, audio interface especially lacks, the user also can only carry out related software study, hardware is not supported user's secondary development, the Large-size LCD Screen that does not also provide simultaneously video to show usefulness, these defectives make these development boards can't realize specific Embedded System Design and the study of handling at video/audio signal.
Investigate according to coordinate indexing, at present in colleges and universities' course, the content relevant with modern video and audio frequency technology applications is fewer, and corresponding practice course lacks more, in addition, science and technology class company is in the R﹠D process of digital video audio product, and the reusability of hardware platform is very low, is unfavorable for the quick research and development listing of Product Cost Control and product.Development of technologies, no matter cultivate from the practice and the manipulative ability of college student, still the aspect such as constantly weed out the old and bring forth the new of product in the scientific ﹠ technical corporation, all require we digital video audio system design aspect method for designing and design level can develop along with the development of technology.
Summary of the invention
The objective of the invention is to the defective at the prior art existence, a kind of embedded platform for developing audio and video is provided, this platform has perfect video, audio frequency and various user data interface, and decoration structure features simple design carries 15 cun LCDs.This platform can be used as digital video Audio Processing experiment porch, finishes multiple audio frequency experiment or the teaching demonstration function of looking; Secondly can utilize the modular system that the user is opened to external bus and rich data interfaces, carry out the secondary development of digital video audio embedded type system based on this platform; In addition, can also utilize the programmable features of system, on the basis that does not change hardware, carry out the prototype design work of special-purpose embedded software developing or video/audio product.
For achieving the above object, the present invention adopts following technical proposals:
A kind of embedded platform for developing audio and video, comprise an aluminium alloy structure box body, be arranged at the LCDs that this aluminium alloy structure box body is renovated, be arranged in this aluminium alloy structure box body wiring board and on electronic devices and components, it is characterized in that circuit is by main control module, difference video signal generates and handover module, the external bus module of modular system, video input module, the audio frequency input/output module, display module and communication module are formed, its circuit structure is: the external bus module of modular system respectively with main control module, difference video signal generates and handover module, video input module, the audio frequency input/output module links to each other with communication module, difference video signal generate with handover module respectively with main control module, the external bus module of modular system links to each other with display module; Adopt the core of field programmable gate function fpga chip, support the soft renucleation of NiosII, simultaneously external multiple memory chip, support program storage, data storage and buffering as the main control module of system; The modular system that adopts 160 pins is to external bus, and is open to the user fully; System supports various video audio interface and external communication interface, supports the digital video voicefrequency circuit embedded system secondary development of user based on this platform; Adopt low voltage, high-speed difference LVDS video signal transmission mode, reduced the video interference, be supported in real-time display video image on the LCDs in the display module.
The external bus module of above-mentioned modular system links to each other with main control module by the DAV interface, link to each other with handover module with the difference video signal generation by the LVDS interface, link to each other with video input module with the video differential signal generation by the DVB interface, link to each other with the audio frequency input/output module by the DAB interface, link to each other with communication module by the CB interface, formed complete video, audio frequency and various external communication interface.
Above-mentioned difference video signal generates and links to each other with main control module by the VoC interface with handover module, link to each other by the external bus module of LVDS interface and modular system, link to each other with display module by the LVDS interface, formed system handles, storage and the display channel of this platform.
It is main control chip that above-mentioned main control module adopts large-scale F PGA chip EP1C6Q240C8.
Above-mentioned difference video signal generates with handover module and adopts DS90C385 difference video to generate chip, adopts DS90CP22 difference video switch chip.
The external bus module of above-mentioned modular system adopts the standard socket of double 160 pins.
Above-mentioned video input module adopts the SAA7111 video decoding chip, supports the input of two-way analog video signal, the input of one road S terminal component video signal.
Above-mentioned audio frequency input/output module adopts the CS4297 audio coding decoding chip that meets AC ' 97 audio standards, supports the input of No. one microphone, a route input, a route output, the output of one road S/PDIF standard audio.
Above-mentioned display module adopts 15 cun LCD.
The present invention compares with existing correlation technique, has following conspicuous outstanding substantive distinguishing features and remarkable advantage:
1, supports multiple format video signal input, the output that the user is controlled and showing, for system and user's secondary development provides perfect video signal source.2, support the sound signal input and output of AC ' 97 audio standard signals, for system and user's secondary development provides perfect audio signal source.3, support multiple storer such as CF card, memory capacity is big, can plug, with the PC interface compatibility.4, modular system is open to the user fully to external bus, and video, audio frequency and other data communication interfaces are provided, and for user's secondary development provides unified interface standard, disposes easy.5,15 cun high definition liquid crystal displays are for the exploitation of system and user's secondary video provides perfect display channel.6, support multichannel difference (LVDS) vision signal to generate, transmit, switch and show, guaranteed the sharpness of vision signal.
Description of drawings
Fig. 1 system architecture synoptic diagram.
Fig. 2 system unit The general frame.
Fig. 3 main control module structural representation.
Fig. 4 difference video signal generates and the handover module structural representation.
Fig. 5 communication module structural representation.
Embodiment
Details are as follows in conjunction with the accompanying drawings for a preferred embodiment of the present invention:
The structure of this embedded platform for developing audio and video such as Fig. 1 institute formula, include an aluminium alloy structure box body (1), be arranged at LCDs (2) that this aluminium alloy structure box body renovates, be arranged in this aluminium alloy structure box body wiring board (3) and on electronic devices and components (4).
Referring to Fig. 2, the Circuits System of this embedded platform for developing audio and video is generated with handover module (6), the external bus module of modular system (7), video input module (8), audio frequency input/output module (9), display module (10) and communication module (11) by main control module (5), difference video signal to be formed.Because its signal exchange order is different, it can be divided into two parts and implement, a part is system's outbound data exchange and management; Another part is internal exchanges data of system and processing.
System's outbound data exchange and administrative section are core with modular system to external bus.The external bus module of modular system (7) links to each other with main control module (5) by the DAV interface; The external bus module of modular system (7) generates with difference video signal by the LVDS interface and links to each other with handover module (6); The external bus module of modular system (7) generates with video differential signal by the DVB interface and links to each other with video input module (8); The external bus module of modular system (7) links to each other with audio frequency input/output module (9) by the DAB interface; The external bus module of modular system (7) links to each other with communication module (11) by the CB interface; Formed complete video, audio frequency and various external communication interface, modular system is open fully to the user to external bus, supports the secondary Embedded System Design of user based on this platform.According to the working method setting of system, modular system receives through the decoded digital video signal of video input module (8) by the DVB interface external bus, and is open to the user; Modular system passes through the DAB interface to external bus and receives through the decoded digital audio and video signals of audio frequency input/output module (9), and is open to the user, by the DAB interface digital audio and video signals encoded and real-time play via audio frequency input/output module (9) simultaneously; Modular system carries out every data communication by the CB interface via communication module (11) and host computer or other external communication module to external bus, comprises serial-port communication, usb communication, ethernet communication and connects keyboard; Modular system provides digital video sound signal and other related data by the DAV interface to main control module (5) to external bus; Modular system generates with handover module (6) by LVDS interface and difference video signal external bus and carries out the exchange of difference video signal.In the present embodiment, all video in the system, audio frequency and other data messages all are to the external bus input system by modular system, after simultaneity factor is handled, except that the video that is used to show, other video, audio frequency and related data information also are to the external bus output system by modular system, thereby realize the data input of total system, output all is by the external bus management of modular system, processing both can be so that the centralized management of the data message of system like this, while also provides the interface of standard and enough facilities for user's secondary development, has increased the plasticity and general adaptability of this platform.
Internal exchanges data of system and processing section are core with the CycloneFPGA chip in the main control module (5), utilize the soft nuclear of NiosII of its inner numerous logical block and implantation to finish system's control and data processing task.Main control module as shown in Figure 3, master control fpga chip (12) adopts the EP1C6Q240C8 chip, inside comprises 5980 logical blocks, supports the soft renucleation of NiosII.EP1C6Q240C8 links to each other with the external bus module of modular system (7) by the DAV interface, reception from modular system to the digital video on the external bus, audio frequency and other data message, and carry out related data according to user's demand and handle, generate and handover module (6) to difference video signal by VoC interface output processed video data then, carry out the generation of difference video signal; The EP1C6Q240C8 exterior arrangement FLASH storer (13), hardware configuration program that promptly can accumulator system also can be stored the executable file in the soft nuclear of NiosII, can also store other user data simultaneously; SRAM storer (14) is as the running environment of executable file in the soft nuclear of NiosII; SDRAM storer (15) is as the buffer memory of video, audio frequency and other data message; CF card memory (16) can be stored real-time video, audio frequency or other data messages, convenient plug, and direct browsing content on PC.Design like this, both solved the high speed processing problem of a large amount of real-time video voice datas in the system, also can utilize abundant peripheral memory, real time data is stored and cushioned, and can display the play in real time with handover module (6) by the difference video signal generation, finished input, processing, storage and the Presentation Function of video/audio signal.
Difference video signal generation and handover module (6) are as shown in Figure 4, adopted the generation module of DS90C385 chip (17) as difference video signal, DS90C385 allows to convert 24 rgb video signals to the LVDS differential signal, be output as the LVDS signal in five-way road, chip is supported the video rgb signal of 85MHz, per 7 signals generate one road LVDS signal, therefore each channel rate is 595Mbps, total data throughout is 297.5Mbytes/ second, the video signal format that adopts in the native system is RGB565, data rate has only 13.5MHz, therefore each LVDS differential signal channel is 94.5Mbps, totally four LVDS signal output channels, total data throughout is 47.25Mbytes/ second; Adopt special-purpose VGA conversion LVDS difference video signal plate (19), the VGA conversion of signals that the outside is directly imported becomes the LVDS difference video signal; Adopt the handover module of DS90CP22 chip (18) as difference video signal, DS90CP22 is that the dual-channel LVDS differential signal switches chip, shared four DS90CP22 chips in system, be used for switching the two-way LVDS difference video signal that generates chip DS90C385 (17) and special-purpose VGA commentaries on classics LVDS signal plate (19) respectively from difference video signal, the difference video signal that switches output can be got back to the external bus module of modular system (7), also can output to display module (10) and directly show.
Communication module (11) has comprised the keyboard interface (23) of serial communication port (20), usb communication mouth (21), ethernet communication mouth (22) and 12 buttons as shown in Figure 5.Above-mentioned four class communication ports all pass through the CB bus interface and link to each other with the external bus module of modular system (7), and are open fully to the user, support user's secondary development.
The embedded platform for developing audio and video of present embodiment, effective processing, storage and demonstration have been realized to video/audio signal and other data message, except video, the sound signal that multiple form is provided, its modular system contains rich video, audio frequency and other data message interface to external bus, support the secondary development of user based on this platform, simultaneously multiple communication interface type is also supported communicating by letter or external various communication module of user and host computer, has improved the general applicability of system.
Here by the reference specific embodiment the present invention is described in detail, but this is an applicating example, should knows that those of ordinary skill in the art can make various modifications and variations under situation about not departing from the scope and spirit of the present invention.
Claims (9)
1, a kind of embedded platform for developing audio and video, comprise an aluminium alloy structure box body (1), be arranged at the LCDs (2) that this aluminium alloy structure box body is renovated, be arranged in this aluminium alloy structure box body wiring board (3) and on electronic devices and components (4), it is characterized in that circuit is by main control module (5), difference video signal generates and handover module (6), the external bus module of modular system (7), video input module (8), audio frequency input/output module (9), display module (10) and communication module (11) are formed, its circuit structure is: the external bus module of modular system (7) respectively with main control module (5), difference video signal generates and handover module (6), video input module (8), audio frequency input/output module (9) links to each other with communication module (11), difference video signal generate with handover module (6) respectively with main control module (5), the external bus module of modular system (7) links to each other with display module (10); Adopt the core of field programmable gate function fpga chip, support the soft renucleation of NiosII, simultaneously external multiple memory chip, support program storage, data storage and buffering as the main control module (5) of system; The modular system that adopts 160 pins is to external bus, and is open to the user fully; System supports various video audio interface and external communication interface, supports the digital video voicefrequency circuit embedded system secondary development of user based on this platform; Adopt low voltage, high-speed difference LVDS video signal transmission mode, reduced the video interference, the LCDs (2) that is supported in the display module (10) goes up real-time display video image.
2, embedded platform for developing audio and video according to claim 1, it is characterized in that the external bus module of described modular system (7) links to each other with main control module (5) by the DAV interface, link to each other with handover module (6) with the difference video signal generation by the LVDS interface, link to each other with video input module (8) with the video differential signal generation by the DVB interface, link to each other with audio frequency input/output module (9) by the DAB interface, link to each other with communication module (11) by the CB interface, formed video, audio frequency and the various outbound data communication interface of this system complete.
3, embedded platform for developing audio and video according to claim 1, it is characterized in that described difference video signal generation links to each other with main control module (5) by the VoC interface with handover module (6), link to each other by the external bus module of LVDS interface and modular system (7), link to each other with display module (10) by the LVDS interface, formed system handles, storage and the display channel of this platform.
4, embedded platform for developing audio and video according to claim 1 is characterized in that it is main control chip that described main control module (5) adopts large-scale F PGA chip EP1C6Q240C8.
5,, it is characterized in that described difference video signal generates and handover module (6) employing DS90C385 difference video generation chip, adopts DS90CP22 difference video switch chip according to claim 1 or 3 described embedded platform for developing audio and video.
6, embedded platform for developing audio and video according to claim 1 and 2 is characterized in that the external bus module of described modular system (7) adopts the standard socket of double 160 pins.
7, embedded platform for developing audio and video according to claim 1 is characterized in that described video input module (8) adopts the SAA7111 video decoding chip, supports the input of two-way analog video signal, the input of one road S terminal component video signal.
8, embedded platform for developing audio and video according to claim 1, it is characterized in that described audio frequency input/output module (9) adopts the CS4297 audio coding decoding chip that meets AC ' 97 audio standards, support the input of No. one microphone, one route input, one route output, the output of one road S/PDIF standard audio.
9, embedded platform for developing audio and video according to claim 1 is characterized in that described display module (10) adopts 15 cun LCD.
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| CN 200610030752 CN1916883A (en) | 2006-09-21 | 2006-09-21 | Embedded platform for developing audio and video |
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| CN 200610030752 CN1916883A (en) | 2006-09-21 | 2006-09-21 | Embedded platform for developing audio and video |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101790093A (en) * | 2010-03-16 | 2010-07-28 | 山东大学 | Device and method for implementation of AVS video decoding by using SOPC |
| CN103235561A (en) * | 2013-02-26 | 2013-08-07 | 烟台中正新技术有限公司 | Universal development platform with audio and video functions for embedded measuring and controlling equipment |
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2006
- 2006-09-21 CN CN 200610030752 patent/CN1916883A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101790093A (en) * | 2010-03-16 | 2010-07-28 | 山东大学 | Device and method for implementation of AVS video decoding by using SOPC |
| CN103235561A (en) * | 2013-02-26 | 2013-08-07 | 烟台中正新技术有限公司 | Universal development platform with audio and video functions for embedded measuring and controlling equipment |
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