CN101789258A - Vehicle-mounted DVD (Digital Video Disk) navigation and video-audio device adopting purely digital audio processing - Google Patents
Vehicle-mounted DVD (Digital Video Disk) navigation and video-audio device adopting purely digital audio processing Download PDFInfo
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- CN101789258A CN101789258A CN 201010138575 CN201010138575A CN101789258A CN 101789258 A CN101789258 A CN 101789258A CN 201010138575 CN201010138575 CN 201010138575 CN 201010138575 A CN201010138575 A CN 201010138575A CN 101789258 A CN101789258 A CN 101789258A
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Abstract
The invention relates to a vehicle-mounted DVD (Digital Video Disk) navigation and video-audio device adopting purely digital audio processing. The device is characterized by being internally provided with an ARM (Advanced RISC Machine), a DSP (Digital Signal Processor) and a digital power amplification module, wherein a control end of the ARM is connected with the DSP; a PCM (Pulse-Code Modulation) output end of the DSP is connected with a PCM input end of the digital power amplification module; and a PWM (Pulse-Width Modulation) output end of the digital power amplification module is connected with a loudspeaker. The invention adopts the scheme of ARM+DVD+AudioDSP+DigitalAMP to realize a totally digital play function and has the advantages of small volume, light weight, high power, strong capacity of resisting disturbance, stable signal transmission, reduction of quantizing noise and distortion which are introduced by a traditional analog processing mode, realization of the restoration of high fidelity tone quality, and the like.
Description
Technical field
The present invention relates to a kind of vehicle-carrying DVD navigation AV device that adopts the pure digi-tal Audio Processing.
Background technology
Present vehicle-carrying DVD navigation audio-video system on the market, generally the scheme of Cai Yonging is the digital signal of DVD player core output, at first pass through the D/A digital-to-analog conversion after, the simulating signal of output is handled through audio again, filtering is delivered to power amplifier and is driven loudspeaker and export.The integrated D/A digital-to-analog conversion device of direct employing DVD player in-core portion that more has.The D/A digital-to-analog conversion is here handled, and can bring very big quantization error, adopts the integrated D/A digital to analog converter of DVD player in-core, and the quantization error of bringing can be bigger.Simultaneously, the transmission of simulating signal, the easier interference that is subjected to the various electromagnetic radiation of machine intimate brings much noise, reduces the signal to noise ratio (S/N ratio) of system; In addition, there is serious efficiency in the power amplifier of simulation, generally all about 30-50%.And analog amplifier almost all adopts negative-feedback circuit, to guarantee its electroacoustic index, in negative-feedback circuit, in order to suppress spurious oscillation, adopts phase compensating circuit, thereby can produce transient intermodulation.
Summary of the invention
The purpose of this invention is to provide a kind of vehicle-carrying DVD navigation AV device that adopts the pure digi-tal Audio Processing, this device adopts the conceptual design of ARM+DVD+AudioDSP+DigitalAMP, can realize digital playing function.
For achieving the above object, the present invention is by the following technical solutions: a kind of vehicle-carrying DVD navigation AV device that adopts the pure digi-tal Audio Processing, it is characterized in that: be provided with ARM, DSP and digital power amplifier module in the described vehicle-carrying DVD navigation AV device, the control end of described ARM is connected with DSP; The PCM output terminal of described DSP is connected with the PCM input end of digital power amplifier module; The PWM output terminal of described digital power amplifier module is connected with loudspeaker.
Described digital power amplifier module comprises audio process, sampling frequency converter and the PWM output module that connects successively.
The digital audio and video signals of DVD player core of the present invention and the output of other passage is handled by DSP earlier, export by digital power amplifier then, realize digital broadcast, because digital power amplifier adopts the switch amplifying circuit, efficient is high, can reach more than 75% ~ 90%, they do not generate heat when work substantially, therefore it does not have the quiescent current consumption of analog amplifier, all energy nearly all are to lay in for audio frequency output, and front and back do not have simulation amplification, no degenerative pining down in addition, so have well " power " characteristic, transient response is good, and " sense of being packed " is extremely strong.In addition, the present invention is in light weight, volume is little, and power is big, antijamming capability is strong, stable signal transmission, can carry out digitized sound handle (adding the 3D audio), have can realize advantage such as wireless transmission.
Description of drawings
Fig. 1 is a system architecture theory diagram of the present invention.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 1, the invention provides a kind of vehicle-carrying DVD navigation AV device that adopts the pure digi-tal Audio Processing, it is characterized in that: be provided with ARM, DSP and digital power amplifier module in the described vehicle-carrying DVD navigation AV device, the control end of described ARM is connected with DSP; The PCM output terminal of described DSP is connected with the PCM input end of digital power amplifier module; The PWM output terminal of described digital power amplifier module is connected with loudspeaker.Described digital power amplifier module comprises audio process, sampling frequency converter and the PWM output module that connects successively.
Specifically, the present invention adopts the scheme of ARM9+DVD+AudioDSP+DigitalAMP, realizes digital playing function.
The DVD player of utilizing is used car rule inhalation type machine core, horizontal positioned, horizontal play mode, and the antivibration ability is strong, and operating temperature range is wide; Adopt ripe decoding scheme, can compatible DVD, VCD, the broadcast of CDs such as CD, SVCD; Support DolbyDigital(AC-3), DTS audio decoder.The SPDIF sound signal of exportable numeral.
AudioDSP mainly uses its inner control module and audio-frequency module in the processing to the digital audio code stream.DSP at first reads the SPDIF sound signal of DVD output or leaves USB flash disk, SD card and NANDFLASH sound intermediate frequency file in, delivers to then in the inner audio decoder module and decodes, output PCM signal.48 HI-FI rank audio process of the inner employing of AudioDSP, the user can be provided with 10 section audio balanced devices as required voluntarily, also can make the optimization adjusting to music according to the kind and the personal like of music, the all right high bass of independent regulation, mega bass, and the position of listening to.
Digital power amplifier module (DigitalAMP), effect are the pcm audio stream that receives DSP output, and inter-process is carried out volume to it and regulated, high bass and loudness, processing such as balanced audio realize the processing of over-extraction sample by SRC, drive loudspeaker output through PWM generator at last.
ARM9 mainly finishes system's control (as: touch-screen control, passage switching, power management etc.), produces voice suggestion, the decoding that control DSP is correlated with etc.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (2)
1. vehicle-carrying DVD navigation AV device that adopts the pure digi-tal Audio Processing, it is characterized in that: be provided with ARM, DSP and digital power amplifier module in the described vehicle-carrying DVD navigation AV device, the control end of described ARM is connected with DSP; The PCM output terminal of described DSP is connected with the PCM input end of digital power amplifier module; The PWM output terminal of described digital power amplifier module is connected with loudspeaker.
2. the vehicle-carrying DVD navigation AV device of employing pure digi-tal Audio Processing according to claim 1, it is characterized in that: described digital power amplifier module comprises audio process, sampling frequency converter and the PWM output module that connects successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010138575 CN101789258B (en) | 2010-04-02 | 2010-04-02 | Vehicle-mounted DVD (Digital Video Disk) navigation and video-audio device adopting purely digital audio processing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010138575 CN101789258B (en) | 2010-04-02 | 2010-04-02 | Vehicle-mounted DVD (Digital Video Disk) navigation and video-audio device adopting purely digital audio processing |
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| Publication Number | Publication Date |
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| CN101789258A true CN101789258A (en) | 2010-07-28 |
| CN101789258B CN101789258B (en) | 2013-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010138575 Expired - Fee Related CN101789258B (en) | 2010-04-02 | 2010-04-02 | Vehicle-mounted DVD (Digital Video Disk) navigation and video-audio device adopting purely digital audio processing |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236267A (en) * | 2012-11-09 | 2013-08-07 | 邵继华 | Vehicular integrated system with direct-control multimedia host, external power amplifier and equalizer |
| CN106954134A (en) * | 2017-04-21 | 2017-07-14 | 先歌国际影音有限公司 | A kind of Disc player and its digital audio and video signals process circuit |
| CN108616721A (en) * | 2018-03-28 | 2018-10-02 | 广州凌飞电子科技有限公司 | A kind of audio-visual dual system of automobile multimedia navigation |
| CN109117113A (en) * | 2018-08-31 | 2019-01-01 | 佛山启碇电子科技有限公司 | A kind of automobile audio regulating system for realizing that onboard audio is adjusted by vehicle device |
| CN110971213A (en) * | 2019-12-11 | 2020-04-07 | 易兆微电子（杭州）有限公司 | 10-section parameter equalizer |
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| CN1475993A (en) * | 2002-08-14 | 2004-02-18 | 乐金电子（惠州）有限公司 | Audio frequency data reappear device and method |
| CN1617455A (en) * | 2003-07-14 | 2005-05-18 | 迈克纳斯公司 | Method and circuit for effective conversion of PCM signals into PWM signals |
| CN201017655Y (en) * | 2006-04-11 | 2008-02-06 | 北京希格玛和芯微电子技术有限公司 | Novelmultifunctional control sound recording playback device |
| CN201622847U (en) * | 2010-04-02 | 2010-11-03 | 福州思迈特数码科技有限公司 | Vehicle-mounted DVD navigation video and audio device adopting all-digital audio processing |
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2010
- 2010-04-02 CN CN 201010138575 patent/CN101789258B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1475993A (en) * | 2002-08-14 | 2004-02-18 | 乐金电子（惠州）有限公司 | Audio frequency data reappear device and method |
| CN1617455A (en) * | 2003-07-14 | 2005-05-18 | 迈克纳斯公司 | Method and circuit for effective conversion of PCM signals into PWM signals |
| CN201017655Y (en) * | 2006-04-11 | 2008-02-06 | 北京希格玛和芯微电子技术有限公司 | Novelmultifunctional control sound recording playback device |
| CN201622847U (en) * | 2010-04-02 | 2010-11-03 | 福州思迈特数码科技有限公司 | Vehicle-mounted DVD navigation video and audio device adopting all-digital audio processing |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236267A (en) * | 2012-11-09 | 2013-08-07 | 邵继华 | Vehicular integrated system with direct-control multimedia host, external power amplifier and equalizer |
| CN106954134A (en) * | 2017-04-21 | 2017-07-14 | 先歌国际影音有限公司 | A kind of Disc player and its digital audio and video signals process circuit |
| CN106954134B (en) * | 2017-04-21 | 2023-02-28 | 先歌国际影音股份有限公司 | Optical disk player and digital audio signal processing circuit thereof |
| CN108616721A (en) * | 2018-03-28 | 2018-10-02 | 广州凌飞电子科技有限公司 | A kind of audio-visual dual system of automobile multimedia navigation |
| CN109117113A (en) * | 2018-08-31 | 2019-01-01 | 佛山启碇电子科技有限公司 | A kind of automobile audio regulating system for realizing that onboard audio is adjusted by vehicle device |
| CN110971213A (en) * | 2019-12-11 | 2020-04-07 | 易兆微电子（杭州）有限公司 | 10-section parameter equalizer |
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| CN101789258B (en) | 2013-01-23 |
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| C56 | Change in the name or address of the patentee |
Owner name: FUJIAN SONG AIRLINES ELECTRONIC INFORMATION TECHNO Free format text: FORMER NAME: FUZHOU SMART DIGITAL SCIENCE + TECHNOLOGY CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 350002 Fujian city in Fuzhou Province, Hongshan Road No. 68 building 4 Shida Technology City D Patentee after: The Fujian sub-Information technology of song avionics Co., Ltd Address before: 350002 Fujian city in Fuzhou Province, Hongshan Road No. 68 building 4 Shida Technology City D Patentee before: Fuzhou Smart Digital Science & Technology Co., Ltd. |
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Granted publication date: 20130123 Termination date: 20210402 |