CN201622847U - Vehicle-mounted DVD navigation video and audio device adopting all-digital audio processing - Google Patents
Vehicle-mounted DVD navigation video and audio device adopting all-digital audio processing Download PDFInfo
- Publication number
- CN201622847U CN201622847U CN2010201494186U CN201020149418U CN201622847U CN 201622847 U CN201622847 U CN 201622847U CN 2010201494186 U CN2010201494186 U CN 2010201494186U CN 201020149418 U CN201020149418 U CN 201020149418U CN 201622847 U CN201622847 U CN 201622847U
- Authority
- CN
- China
- Prior art keywords
- vehicle
- dsp
- digital
- dvd navigation
- digital power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Amplifiers (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
Abstract
The utility model relates to a vehicle-mounted DVD navigation video and audio device adopting all-digital audio processing, which is characterized in that the vehicle-mounted DVD navigation video and audio device is internally provided with an ARM, a DSP and a digital power amplification module, wherein a control end of the ARM is connected with the DSP; a PCM output end of the DSP is connected with a PCM input end of the digital power amplification module; and a PWM output end of the digital power amplification module is connected with a loudspeaker. The vehicle-mounted DVD navigation video and audio device adopts a scheme with ARM, DVD, AudioDSP and DigitalAMP, realizes all-digital playing function, and has the advantages of having little volume, light weight, large power, strong interference resistance and stable signal transmission, reducing quantizing noise and distortion introduced by the traditional analog processing mode, realizing high-fidelity sound quality restoration and the like.
Description
Technical field
The utility model 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 utility model provides a kind of vehicle-carrying DVD navigation AV device that adopts the pure digi-tal Audio Processing, and this device adopts the conceptual design of ARM+DVD+AudioDSP+DigitalAMP, can realize digital playing function.
For achieving the above object, the utility model 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 the utility model DVD player core 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 the time do not generate heat substantially in work, so it does not have the quiescent current consumption of analog amplifier, and all energy nearly all are to lay in for audio frequency output, there are not simulation amplification, no degenerative pining down in addition, so have well " power " characteristic, transient response is good, " sense of being packed " is extremely strong.In addition, the utility model 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 utility model.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 1, the utility model 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 scheme that the utility model adopts 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 utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.
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 |
|---|---|---|---|
| CN2010201494186U CN201622847U (en) | 2010-04-02 | 2010-04-02 | Vehicle-mounted DVD navigation video and audio device adopting all-digital audio processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201494186U CN201622847U (en) | 2010-04-02 | 2010-04-02 | Vehicle-mounted DVD navigation video and audio device adopting all-digital audio processing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201622847U true CN201622847U (en) | 2010-11-03 |
Family
ID=43026304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201494186U Expired - Fee Related CN201622847U (en) | 2010-04-02 | 2010-04-02 | Vehicle-mounted DVD navigation video and audio device adopting all-digital audio processing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201622847U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789258A (en) * | 2010-04-02 | 2010-07-28 | 福州思迈特数码科技有限公司 | Vehicle-mounted DVD (Digital Video Disk) navigation and video-audio device adopting purely digital audio processing |
-
2010
- 2010-04-02 CN CN2010201494186U patent/CN201622847U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789258A (en) * | 2010-04-02 | 2010-07-28 | 福州思迈特数码科技有限公司 | Vehicle-mounted DVD (Digital Video Disk) navigation and video-audio device adopting purely digital audio processing |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101789258B (en) | Vehicle-mounted DVD (Digital Video Disk) navigation and video-audio device adopting purely digital audio processing | |
| CN105120389A (en) | A method and earphone for carrying out noise reduction processing according to scenes | |
| WO2015127832A1 (en) | Mobile terminal for realizing high-fidelity music playback | |
| CN105118514A (en) | A method and earphone for playing lossless quality sound | |
| CN106941643B (en) | A kind of multi-functional intelligent sound control method of set | |
| CN102568512A (en) | Method and device of volume control | |
| CN201622847U (en) | Vehicle-mounted DVD navigation video and audio device adopting all-digital audio processing | |
| CN104869511A (en) | High-fidelity wifi stereo | |
| CN203181203U (en) | Multimedia loudspeaker box | |
| CN204681574U (en) | A kind of high-fidelity wifi sound equipment | |
| CN202218386U (en) | Recording circuit capable of imitating recording studio functions | |
| CN201243266Y (en) | Equilibrium processing device for frequency response characteristic of audio-frequency system based on DSP | |
| CN203761375U (en) | Audio processing device and audio playing equipment | |
| CN202068551U (en) | Decoding sound circuit | |
| CN201114769Y (en) | Sound box with playing and power amplification effect | |
| CN201928428U (en) | Novel microphone | |
| CN103258563A (en) | Mobile terminal and music player used for the same | |
| CN202285418U (en) | Digital telephone set top box | |
| CN201813349U (en) | Family cinema audio power amplifier | |
| CN204616068U (en) | A kind of audio frequency processing circuit and mobile terminal | |
| CN203070758U (en) | Audio recording and playing apparatus | |
| CN202121756U (en) | Guitar amplifier | |
| CN216599609U (en) | Combined amplifier all-in-one machine | |
| CN203279022U (en) | Audio playing circuit and TV | |
| CN204334930U (en) | A kind of sound circuit system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101103 Termination date: 20150402 |
|
| EXPY | Termination of patent right or utility model |