CN108391202A - A kind of onboard audio dynamic sampling method and system - Google Patents
A kind of onboard audio dynamic sampling method and system Download PDFInfo
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- CN108391202A CN108391202A CN201810163931.1A CN201810163931A CN108391202A CN 108391202 A CN108391202 A CN 108391202A CN 201810163931 A CN201810163931 A CN 201810163931A CN 108391202 A CN108391202 A CN 108391202A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
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Abstract
The present invention relates to audio sample method and technology field more particularly to a kind of onboard audio dynamic sampling method and system, include the following steps：Audio is decoded to obtain audio pulse code modulation data；Audio digit and audio sample rate are obtained according to audio pulse code modulation data；According to the audio sample rate of acquisition, processing unit obtains clock signal corresponding with the audio sample rate；Processing unit configures corresponding bus clock according to the clock signal；The audio digital processing device does audio effect processing under corresponding bus clock to the audio pulse code modulation data.The goal of the invention of the present invention is to provide a kind of onboard audio dynamic sampling method and system, solving existing audio sample method using technical solution provided by the invention, there are sample rate transfer zones come audio anharmonic wave distortion, the technical issues of processor resource of occupancy is big and simulation input causes low sampling rate that can not restore audio details.
Description
Technical field
The present invention relates to audio sample method and technology field more particularly to a kind of onboard audio dynamic sampling method and it is
System.
Background technology
Sample rate is a kind of pitch criteria, and just as the resolution ratio of photo, sample rate is higher, the abundanter fidelity of music.Sound
When sound becomes electronic signal from air pulsation, high sampling rate can allow music closer to primary sound quality, and the details of performance is more rich.
However, even if music making accepted standard is very high, if when with the device plays of substandard, east that everything effort is all paid
Stream.
With the development in market and technology, the function of automobile audio becomes more and more abundant, and high sampling rate music media is general
And traditional fixed sample rate conversion (SRC) audio framework cannot meet experience of the people on automobile audio.
Fig. 1 is the common configuration diagram of depot：U1 is central processing unit (CPU), audio frequency media decoding；U2 is audio number
Word processing device (DSP), mainly does audio effect processing to decoded audio data；U3 is power amplifier (Amplifier), power amplification
Device amplifies audio signal, drives loudspeaker；X1 is crystal oscillator, is the system clock of CPU, audio sampling clock thus clock division, essence
It spends relatively low；X2 is crystal oscillator, is the system clock of DSP.The use method of the common framework of depot is as follows：A piece of music is played, it is first
First in the processor player sample rate conversion is done to audio decoder, be converted to fixed 48KHz or 44.1KHz, then
I2S data are transmitted to DSP and carry out audio effect processing.
If it is 96KHz to play former audio sample rate, switch to 44.1KHz, will dropped audio some detailed information, shadow
When ringing sense of hearing, therefore playing audio, sample rate transfer zone carrys out audio anharmonic wave distortion；In addition, processor when carrying out SRC, needs
The processor resource to be occupied is big, especially currently popular linux system, and high performance SRC needs to consume great number
License expenses；For simulation input, low sampling rate can not restore audio details.
Invention content
The goal of the invention of the present invention is to provide a kind of onboard audio dynamic sampling method and system, be provided using the present invention
Technical solution solve existing audio sample method there are sample rate transfer zones to come audio anharmonic wave distortion, the processor of occupancy
The technical issues of resource is big and simulation input causes low sampling rate that can not restore audio details.
In order to solve the above-mentioned technical problem, a kind of onboard audio dynamic sampling method of one aspect of the present invention offer, including with
Lower step：
1), audio is decoded to obtain audio pulse code modulation data；
2), the obtained audio pulse code modulation data are sent to the static data link library of Linux sound frameworks,
Obtain audio digit and audio sample rate；
3), according to the audio sample rate of acquisition, processing unit is by I2C bus configurations and obtains and the audio sample rate
Corresponding clock signal；
4), processing unit configures the I2S bus clocks of audio digital processing device according to the clock signal, and by step 1
Obtained audio pulse code modulation data transmission is to audio digital processing device；
5), the audio digital processing device does audio under I2S bus clocks to the audio pulse code modulation data
Processing, then by the sampling frequency converter inside the audio digital processing device by the audio pulse code tune after audio effect processing
The I2S data that data processed switch to 96KHz are transmitted to power amplifier output.
In step 3, processing unit by I2C bus configurations and obtains clock letter corresponding with the audio sample rate
Number；Preferably, the clock signal provides dynamic clock for audio, and sampling is not converted in processing unit to reach audio
Rate.
In step 1, audio is decoded to obtain audio pulse code modulation data；Preferably, the audio is mould
Quasi- sound source signal carries out ADC conversion decodings using the high sampling rate of 96KHz and obtains audio pulse code modulation data.
Based on above-mentioned onboard audio dynamic sampling method, another aspect of the present invention also provides a kind of onboard audio dynamic sampling
The system of method, including the static data link library of Linux sound frameworks, central processing unit, audio digital processing device, the first crystalline substance
It shakes, the second crystal oscillator and multifrequency crystal oscillator；
First crystal oscillator and the second crystal oscillator are respectively used to carry for the central processing unit and the audio digital processing device
For system clock；
The central processing unit obtains audio pulse code modulation data for being decoded to audio；
The static data link library of the Linux sound framework, for being obtained according to the audio pulse code modulation data
Obtain audio digit and audio sample rate；
The audio digital processing device, for doing audio effect processing to decoded audio data；
The multifrequency crystal oscillator is believed for providing different clocks to the central processing unit according to different audio sample rates
Number.
From the foregoing, it will be observed that following advantageous effect can be obtained using the present invention：Multifrequency crystal oscillator in system provides for audio
Dynamic clock does not convert sample rate to reach audio in processing unit, avoids audio non-because sample rate transfer zone carrys out audio
Harmonic distortion；To simulation sound source signal input, high sampling rate is sampled, improves audio fidelity, the finer and smoother music of output；Compared with
Under high audio capability requires, software SRC license costs are saved.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, the present invention will be implemented below
Attached drawing is briefly described needed in the description of example or the prior art.It should be evident that the accompanying drawings in the following description
Only a part of the embodiment of the invention, for those of ordinary skill in the art, in not making the creative labor property
Under the premise of, other drawings may also be obtained based on these drawings.
Fig. 1 is the common audio frequency process Organization Chart of depot；
Fig. 2 is onboard audio dynamic sampling method flow block diagram of the embodiment of the present invention；
Fig. 3 is onboard audio dynamic sampling system structure diagram of the embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
Existing automobile audio, sampling fixed sample rate sample rate conversion is done to audio, be converted to fixed 48KHz or
44.1KHz, sample rate transfer zone carry out audio anharmonic wave distortion；Processor needs the processor resource occupied when carrying out SRC
Greatly, especially currently popular linux system, and high performance SRC needs to consume the license expenses of great number；For simulation
Input, low sampling rate can not restore audio details.
Fig. 2 is referred to, in order to solve the above-mentioned technical problem, on the one hand the present embodiment provides a kind of onboard audio dynamic sampling
Method includes the following steps：
1), audio is decoded to obtain audio pulse code modulation data；
2), obtained audio pulse code modulation data are sent to the static data link library of Linux sound frameworks, are obtained
Audio digit and audio sample rate；
3), according to the audio sample rate of acquisition, processing unit is by I2C bus configurations and obtains corresponding with audio sample rate
Clock signal；
Clock signal provides dynamic clock for audio, and sample rate is not converted in processing unit to reach audio.
4), processing unit configures the I2S bus clocks of audio digital processing device according to clock signal, and step 1 is obtained
Audio pulse code modulation data transmission to audio digital processing device；
5), audio digital processing device does audio effect processing under I2S bus clocks to audio pulse code modulation data, then leads to
The sampling frequency converter crossed inside audio digital processing device switchs to the audio pulse code modulation data after audio effect processing
The I2S data of 96KHz are transmitted to power amplifier output.
Based on above-mentioned onboard audio dynamic sampling method, on the other hand the present embodiment also provides a kind of onboard audio dynamic and adopts
The system of quadrat method refers to Fig. 3, including the static data link library of Linux sound frameworks, central processing unit U1, audio number
Word processing device U2, the first crystal oscillator X1, the second crystal oscillator X2, multifrequency crystal oscillator X3 and power amplifier U3.
Wherein, the first crystal oscillator X1 and the second crystal oscillator X2 is respectively used to as central processing unit U1 and audio digital processing device U2
System clock is provided；
Central processing unit U1 obtains audio pulse code modulation data for being decoded to audio；
The static data link library of Linux sound frameworks, for obtaining audio position according to audio pulse code modulation data
Number and audio sample rate；
Audio digital processing device U2, for doing audio effect processing to decoded audio data；
Multifrequency crystal oscillator X3, for providing different clock signals to central processing unit U1 according to different audio sample rates；
Power amplifier U3, power amplifier drive loudspeaker for amplifying audio signal.
Above-mentioned onboard audio dynamic sampling system concrete operating principle is as follows：
Vehicle device plays an audio, and player is to audio decoder first in central processing unit U1, the audio arteries and veins that will be obtained
The static data link library that coding modulation data gives Linux sound frameworks is rushed, audio digit and sample rate are obtained；Central processing
Device U1 is configured the crystal oscillator of multifrequency crystal oscillator X3 by I2C, corresponding clock is obtained, in configuring according to the audio sample rate of acquisition
Then the I2S clocks of central processor U1 start audio pulse code modulation data transmission to audio digital processing device U2；Audio arteries and veins
It rushes coding modulation data and does audio effect processing in audio digital processing device U2, then by included inside audio digital processing device U2
Hardware SRC switch to 96KHz I2S data be transmitted to power amplifier output.
Technical solution provided in this embodiment, the multifrequency crystal oscillator in system provides dynamic clock for audio, to reach
Audio does not convert sample rate in processing unit, and audio is avoided to carry out audio anharmonic wave distortion because of sample rate transfer zone；It greatlys save
CPU usage；When playing 96KHz audios, the purpose of " 0 " conversion is realized, ensure that music is genuine；In addition, playing AUX
When the analog signals source of sound such as IN, is converted using the high sampling ADC of 96KHz, restore audio details to greatest extent；To simulation source of sound letter
Number input, DSP high sampling rates improve audio fidelity, the finer and smoother music of output；Under high audio performance requirement, save
Software SRC license costs.
Embodiments described above does not constitute the restriction to the technical solution protection domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution made by within the spirit and principle of mode
Within enclosing.
Claims (4)
1. a kind of onboard audio dynamic sampling method, it is characterised in that：Include the following steps：
1), audio is decoded to obtain audio pulse code modulation data；
2), the obtained audio pulse code modulation data are sent to the static data link library of Linux sound frameworks, are obtained
Audio digit and audio sample rate；
3), according to the audio sample rate of acquisition, processing unit is by I2C bus configurations and obtains corresponding with the audio sample rate
Clock signal；
4), processing unit configures the I2S bus clocks of audio digital processing device according to the clock signal, and step 1 is obtained
Audio pulse code modulation data transmission to audio digital processing device；
5), the audio digital processing device does audio effect processing under I2S bus clocks to the audio pulse code modulation data,
Again by the sampling frequency converter inside the audio digital processing device by the audio pulse code modulation number after audio effect processing
It is transmitted to power amplifier output according to the I2S data for switching to 96KHz.
2. onboard audio dynamic sampling method according to claim 1, in step 3, processing unit is matched by I2C buses
It sets and obtains clock signal corresponding with the audio sample rate；It is characterized in that：The clock signal provides dynamic for audio
Clock, sample rate is not converted in processing unit to reach audio.
3. onboard audio dynamic sampling method according to claim 2 is decoded audio to obtain sound in step 1
Frequency pulse code modulation data；It is characterized in that：The audio is simulation sound source signal, is carried out using the high sampling rate of 96KHz
ADC conversion decodings obtain audio pulse code modulation data.
4. a kind of system based on the onboard audio dynamic sampling method described in any one of claim 1-3, it is characterised in that：
Static data link library, central processing unit including Linux sound frameworks, audio digital processing device, the first crystal oscillator, the second crystal oscillator
With multifrequency crystal oscillator；
First crystal oscillator and the second crystal oscillator are respectively used to provide for the central processing unit and the audio digital processing device and be
System clock；
The central processing unit obtains audio pulse code modulation data for being decoded to audio；
The static data link library of the Linux sound framework, for obtaining sound according to the audio pulse code modulation data
Frequency digit and audio sample rate；
The audio digital processing device, for doing audio effect processing to decoded audio data；
The multifrequency crystal oscillator, for providing different clock signals to the central processing unit according to different audio sample rates.
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Cited By (1)
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| CN114253896A (en) * | 2021-12-07 | 2022-03-29 | 苏州上声电子股份有限公司 | Is used for I2Clock generation method and system of S-audio bus |
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