CN106782562A - Audio-frequency processing method, apparatus and system - Google Patents
Audio-frequency processing method, apparatus and system Download PDFInfo
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- CN106782562A CN106782562A CN201611187280.7A CN201611187280A CN106782562A CN 106782562 A CN106782562 A CN 106782562A CN 201611187280 A CN201611187280 A CN 201611187280A CN 106782562 A CN106782562 A CN 106782562A
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L15/00—Speech recognition
- G10L15/28—Constructional details of speech recognition systems
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L15/00—Speech recognition
- G10L15/28—Constructional details of speech recognition systems
- G10L15/32—Multiple recognisers used in sequence or in parallel; Score combination systems therefor, e.g. voting systems
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/008—Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
Abstract
The present invention proposes a kind of audio-frequency processing method, apparatus and system, the voice signal that microphone array is picked up is converted into multi-path digital signal input FGPA chips or MCU chip by ADC first, receive the left channel data and right channel data in the multi-path digital signal successively by FGPA chips or MCU chip, and after to the left channel data and right channel data caching Preset Time respectively, data convert to each passage is carried out audio frequency process by single channel data signal of the output with synchronous identification signal to audio process by audio process.Audio-frequency processing method of the invention is exported to back-end processing system after being single channel data signal by the multi-path digital signal transacting that be input into for front end by software or hardware mode, improves the compatibility of system design, saves construction cycle and cost.
Description
Technical field
The present invention relates to multimedia technology field, more particularly to a kind of audio-frequency processing method, apparatus and system.
Background technology
In voice application system, with the development of speech recognition application, the way requirement ratio being input into microphone simultaneously
It is more, but back-end processing system does not support the interface that microphone multichannel is input into simultaneously substantially.Such as in current application system,
There are No. 8 microphones to add 3 road audio collection signals again while being input in back-end processing system, but back-end processing system only has one
Road IIS interfaces or pcm interface, it is impossible to meet the demand that above-mentioned multiple signals are input into simultaneously.
The content of the invention
It is a primary object of the present invention to provide a kind of audio-frequency processing method, it is intended to solve the rear end of existing voice application
Reason system cannot meet the technical problem that multiple signals are input into simultaneously.
To achieve the above object, audio-frequency processing method proposed by the present invention, comprises the following steps：
The voice signal that microphone array is picked up is converted into multi-path digital signal；
Receive sequentially inputting for the left channel data in the multi-path digital signal and right channel data；
After the left channel data and right channel data are cached into Preset Time respectively, output is with synchronous identification signal
Single channel data signal；
The single channel data signal is restored into each passage according to the synchronous identification signal carries out audio frequency process.
Further, the left channel data received in the multi-path digital signal and right channel data sequentially input
The step of, specifically include：
The multi-path digital signal being input into through IIS is synchronously received with the first sample rate；
Whether the frame clock for judging the multi-path digital signal is predetermined level, if so, the multi-path digital signal for then receiving
It is left channel data, if it is not, the multi-path digital signal for then receiving is right channel data；
After predetermined interval, switch the channel data type of the multi-path digital signal for receiving.
Further, it is described left channel data and right channel data are cached into Preset Time respectively after, output is with synchronous
The step of recognizing the single channel data signal of signal, specifically includes：
According to the left channel data or the number of channels of right channel data that receive, the second sample rate is set；
The left channel data and right channel data that will be sequentially received are cached respectively in sequence, and to last group of passage
Data make synchronous identifying processing；
After the preset lime, according to left channel data and right channel data caching sequentially, with second sample rate
Single channel is exported.
Further, first sample rate is set to f1, second sample rate is set to f2, the number of channels is set to n,
Then f2=n*f1。
Another object of the present invention is to propose a kind of apparatus for processing audio, the apparatus for processing audio includes：
Analog-to-digital conversion module, multi-path digital signal is converted into by the voice signal that microphone array is picked up；
Audio merging module, receives the defeated successively of left channel data in the multi-path digital signal and right channel data
Enter, the single channel with synchronous identification signal is output as after the left channel data and right channel data are cached into Preset Time respectively
Data signal；
Audio processing modules, the single channel data signal is restored into each passage according to the synchronous identification signal carries out sound
Frequency is processed.
Further, the audio merging module includes：
Receiving unit, the multi-path digital signal being input into through IIS is synchronously received with the first sample rate；
Judging unit, whether the frame clock for judging the multi-path digital signal is predetermined level, if so, the multichannel for then receiving
Data signal is left channel data, if it is not, the multi-path digital signal for then receiving is right channel data；
Switch unit, after predetermined interval, switches the channel data type of the multi-path digital signal for receiving.
Further, the audio merging module also includes：
Setup unit, according to the left channel data or the number of channels of right channel data that receive, sets the second sample rate；
Buffer unit, the left channel data and right channel data that will be sequentially received is cached respectively in sequence, and to most
Later group channel data makees synchronous identifying processing；
Output unit, after the preset lime, according to left channel data and right channel data caching sequentially, with described
Two sample rate single channel are exported.
Further, first sample rate is set to f1, second sample rate is set to f2, the number of channels is set to n,
Then f2=n*f1。
Further, the audio merging module is fpga chip or MCU chip.
The present invention also propose a kind of audio frequency processing system, the audio frequency processing system include analog-digital converter, audio process,
And apparatus for processing audio as described above, the apparatus for processing audio connection analog-digital converter and audio process, receive
The multi-path digital signal of multiple analog-digital converter inputs, output single channel data signal to audio process.
Audio-frequency processing method of the invention, is converted into many ways by the voice signal that microphone array is picked up through ADC first
Word signal, then receives left channel data and right channel data successively according to the level value of the clock of the multi-path digital signal
Input, then after the left channel data and right channel data are cached into Preset Time respectively, output is with synchronous identification signal
Single channel data signal, the single channel data signal finally is restored into each passage according to the synchronous identification signal is carried out at audio
Reason.Audio-frequency processing method of the invention is single channel number by the multi-path digital signal transacting that be input into for front end by software or hardware mode
Exported to back-end processing system after word signal, improve the compatibility of system design, save construction cycle and cost.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Structure according to these accompanying drawings obtains other accompanying drawings.
Fig. 1 is the flow chart of the embodiment of audio-frequency processing method of the present invention；
Fig. 2 is the particular flow sheet of step S20 in Fig. 1；
Fig. 3 is the particular flow sheet of step S30 in Fig. 1；
Fig. 4 is the functional block diagram of the embodiment of apparatus for processing audio of the present invention.
Drawing reference numeral explanation：
The realization of the object of the invention, functional characteristics and advantage will be described further referring to the drawings in conjunction with the embodiments.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention proposes a kind of audio-frequency processing method.
Reference picture 1, Fig. 1 is the flow chart of the embodiment of audio-frequency processing method of the invention.
In the present embodiment, the audio-frequency processing method is comprised the following steps：
S10：The voice signal that microphone array is picked up is converted into multi-path digital signal；
S20：Receive sequentially inputting for the left channel data in the multi-path digital signal and right channel data；
S30：After the left channel data and right channel data are cached into Preset Time respectively, output is with synchronous identification letter
Number single channel data signal；
S40：The single channel data signal is restored into each passage according to the synchronous identification signal carries out audio frequency process.
The multiple signals that the audio-frequency processing method of the present embodiment is mainly used in front-end collection in voice application system are merged into
One-channel signal, audio frequency process is carried out into the audio process of rear end to be input into, and in one embodiment, sets MIC1To MIC8
It is the MIC arrays of voice collecting, each MIC is linked into the input all the way of ADC, the input of MIC needs 4 groups of IIS altogether, and internal
Audio sample is also required to 2 groups of IIS, is total up to 6 groups of IIS while being input to audio frequency processing system, but most of audio frequency processing system
Only 1 group IIS or pcm interface are input into, so multigroup while the IIS of input cannot be directly inputted in audio frequency processing system, institute
With need by the synthesis of multigroup IIS signals all the way signal input in audio frequency processing system, to solve what is configured in existing system
Hardware only exists an IIS interface or PCM input or output interfaces mostly, so as to cause the cycle stretch-out in system development, and
Capacitive reduction.
The audio-frequency processing method of the present embodiment, when being operated, the voice signal mould for first picking up microphone array
Plan signal sends to the ADC (analog-digital converter) being connected with the microphone array and is converted into data signal, in general, every two
Group microphone one ADC of correspondence, two groups of microphones are input into left channel data and right channel data, ADC respectively after being changed by ADC
After multi-path voice analog signal is converted into multi-path digital signal, by IIS interfaces by the multi-path digital signal by software
Tupe or hardware handles pattern carry out Data Data merging and fusion, software processing pattern such as MCU etc. and are cached by building
Area, total data is received to the buffer area, is packed by total data, by the packet after packing by only
One IIS output interfaces or PCM output interfaces, output to audio frequency processing system is applied；Hardware handles pattern is typically used
FGPA (field-programmable gate array), by increasing transmission rate during output, exports single channel data signal in same time.
Obtain ADC by IIS by the operation of multi-path digital signal input when, perform and receive the multi-path digital signal
Operational order, because voice analog signal through ADC when analog-to-digital conversion is carried out, can directly according to the level of voice analog signal
Height is converted to high level digital signal and low level digital signal, when being input into through IIS interfaces, according to data signal internal clock
Level value height input left channel data or right channel data, general LRCK be high level when simultaneously be input into multi-path digital letter
Left channel data in number, the right channel data being input into multi-path digital signal simultaneously when LRCK is low level, is receiving
After the left channel data and right channel data of the multi-path digital signal, the left channel data and right channel data are delayed
Deposit, and the left channel data or right channel data that are input into last group carry out identifying processing simultaneously, after the preset lime, will
This left channel data of caching, right channel data and synchronous identification signal data successively from unique IIS output interfaces or
PCM output interfaces are exported, and the audio process that formation single channel data signal is exported to rear end carries out next step audio frequency process.
After the single channel data signal is received, the synchronous identification signal data carried according to the single channel data signal
After the single channel data signal is restored into each passage, it is possible to carry out follow-up audio frequency process, solving is carrying out multichannel
Special configuration multichannel input or output interface is also needed during audio frequency process, development time and cost is saved, system application is improve
Compatibility.
Audio-frequency processing method of the invention, is converted into many ways by the voice signal that microphone array is picked up through ADC first
Word signal, then receives left channel data and right channel data successively according to the level value of the clock of the multi-path digital signal
Input, then after the left channel data and right channel data are cached into Preset Time respectively, output is with synchronous identification signal
Single channel data signal, the single channel data signal finally is restored into each passage according to the synchronous identification signal is carried out at audio
Reason.Audio-frequency processing method of the invention is single channel number by the multi-path digital signal transacting that be input into for front end by software or hardware mode
Exported to back-end processing system after word signal, improve the compatibility of system design, save construction cycle and cost.
Further, reference picture 2, the audio-frequency processing method based on above-described embodiment, step S20 is specifically included：
S21：The multi-path digital signal being input into through IIS is synchronously received with the first sample rate；
S22：Whether the frame clock for judging the multi-path digital signal is predetermined level, if so, the multi-path digital for then receiving
Signal is left channel data, if it is not, the multi-path digital signal for then receiving is right channel data；
S23：After predetermined interval, switch the channel data type of the multi-path digital signal for receiving.
In the present embodiment, to being changed via ADC after multi-path digital signal when receiving, first according to the group of ADC
Number, multiple interfaces of CPU, FPGA or MCU of subsequent treatment is connected to by IIS interfaces, according to the first sample rate, Ye Jibiao
Accurate sampling transmission rate is synchronously received per data signal input all the way, because every railway digital signal is picked up by two groups of microphones
Voice signal analog signal convert, and left channel data and right channel data have been distinguished, so in the numeral of multichannel
During signal input, whether the frame clock that need to judge the railway digital signal is high level in predetermined level, namely electronic engineering,
It is that 2.4V-5.0V, low level are 0.0V-0.4V generally for high level for TTL, high level is 4.99- for CMOS
5.0v, low level are 0.0-0.01v, if so, the multi-path digital signal for then receiving is left channel data, if the multichannel for otherwise receiving
Data signal is right channel data, certainly, it is necessary to switch the channel data of the multi-path digital signal of reception after predetermined interval
Type, namely after predetermined interval, left channel data will be received and switch to the right channel data of reception.
With further reference to above-described embodiment, by taking left-justify IIS signals as an example, when LRCK is high level, the DATA data of ADC
It is the data of left passage, when LRCK is low level, DATA data are right channel data；Because the clock of ADC is connected together
, so when LRCK is high, being input into MIC1、MIC3、MIC5、MIC7Deng the left channel data on ADC；It is defeated when LRCK is low
Enter MIC2、MIC4、MIC6、MIC8Deng the right channel data on ADC.
Further, reference picture 3, the audio-frequency processing method based on above-described embodiment, step S30 is specifically included：
S31：According to the left channel data or the number of channels of right channel data that receive, the second sample rate is set；
S32：The left channel data and right channel data that will be sequentially received are cached respectively in sequence, and to last group
Channel data makees synchronous identifying processing；
S33：After the preset lime, according to left channel data and right channel data caching sequentially, adopted with described second
Sample rate single channel is exported.
In the present embodiment, when multigroup left channel data or right channel data is received, in addition it is also necessary to according to the left passage
Or the number of channels of right passage sets the second sampling road of left channel data and right channel data, namely speed during output, so
Order when the left channel data that will be sequentially received afterwards and right channel data are according to input cached, and will be recently entered
That group data replaces with the synchronous identification data with identification function, according to left channel data in caching Preset Time after the meeting
It is data cached with right channel data, it is defeated from an IIS output interface or PCM output interfaces with the second sample rate of above-mentioned setting
Go out, the data setting between two groups of synchronous identification datas is a frame section, every time one voice data of frame section of output.
With further reference to above-described embodiment, synchronization has 6 left passage or right the channel data inputs of ADC, then
Current data to receiving is cached, after the completion of current data reception, using pcm interface data are received, typically
Exported from PCM or IIS interfacing orders at the audio to rear end with 6 times of (just how many times of how many passage) speed after caching 1/2fs
Reason system, while output, another channel datas of each ADC of synchronization caching, and the data is activation of another passage is also to use phase
Same mode.
Because the single-pass data for exporting is transmitted according to channel sequence, the data transmitted for Division identification
Channel recognition is, it is necessary to last group of data of the right passage sent in PCM, are changed to synchronous identification data, that is, sacrifice ADC6
Right data, use for synchronous identification, and the data between two synchronous identification datas are considered as a frame, and each frame is exactly every each passage
The data of secondary sampling.
Further, first sample rate is set to f1, second sample rate is set to f2, the number of channels is set to n,
Then f2=n*f1, the multi-path digital signal that will also receive is within the identical time with single channel output.
Present invention further propose that a kind of apparatus for processing audio.
Reference picture 4, Fig. 4 is the functional block diagram of the embodiment of apparatus for processing audio of the invention.
In the present embodiment, the apparatus for processing audio 100 includes：
Analog-to-digital conversion module 10, multi-path digital signal is converted into by the voice signal that microphone array is picked up；
Audio merging module 20, receives the defeated successively of left channel data in the multi-path digital signal and right channel data
Enter, the single channel with synchronous identification signal is output as after the left channel data and right channel data are cached into Preset Time respectively
Data signal；
Audio processing modules 30, the single channel data signal is restored into each passage according to the synchronous identification signal is carried out
Audio frequency process.
The apparatus for processing audio of the present embodiment is mainly used in the multiple signals of front-end collection in voice application system through FPGA
Or MCU merges into one-channel signal, audio frequency process is carried out into the audio process of rear end to be input into, set in one embodiment
MIC1To MIC8It is the MIC arrays of voice collecting, each MIC is linked into the input all the way of ADC, the input of MIC needs 4 groups altogether
IIS, and internal audio frequency sampling is also required to 2 groups of IIS, is total up to 6 groups of IIS while being input to audio frequency processing system, but most of sound
Frequency processing system only has 1 group of IIS or pcm interface to be input into, so multigroup while the IIS of input cannot be directly inputted to audio frequency process
In system, thus need by the synthesis of multigroup IIS signals all the way signal input in audio frequency processing system, to solve existing system
The hardware of middle configuration only exists an IIS interface or PCM input or output interfaces mostly, so as to cause the cycle in system development
Extension, compatibility is reduced.
The apparatus for processing audio 100 of the present embodiment, when being operated, first by analog-to-digital conversion module 10 by microphone array
The voice signal analog signal for arranging pickup is converted into data signal, in general, one ADC of every two groups of microphones correspondence, two groups of wheats
Gram wind is input into left channel data and right channel data respectively after being changed by ADC, and be converted into for multi-path voice analog signal by ADC
After multi-path digital signal, the multi-path digital signal is entered by software processing pattern or hardware handles pattern by IIS interfaces
Row Data Data merges and merges, and total data is received to described and delayed by software processing pattern such as MCU etc. by building buffer area
After depositing area, packed by total data, the packet after packing is exported by unique IIS output interfaces or PCM
Interface, output to audio process is applied；Hardware handles pattern typically uses FGPA (field-programmable gate array), passes through
Transmission rate during increase output, exports single channel data signal in same time.
Audio merging module 20 obtain ADC by IIS by the operation of multi-path digital signal input when, perform and receive described
The operational order of multi-path digital signal, because voice analog signal through ADC when analog-to-digital conversion is carried out, can be directly according to voice
The level height of analog signal is converted to high level digital signal and low level digital signal, when being input into through IIS interfaces, according to
Height input left channel data or the right channel data of the level value of data signal internal clock, when general LRCK is high level simultaneously
Left channel data in input multi-path digital signal, the right passage being input into multi-path digital signal simultaneously when LRCK is low level
Data, after the left channel data and right channel data for receiving the multi-path digital signal, to the left channel data and the right side
Channel data is cached, and the left channel data or right channel data that are input into last group carry out identifying processing simultaneously,
After Preset Time, by this left channel data of caching, right channel data and synchronous identification signal data successively from unique
IIS output interfaces or PCM output interfaces are exported, and the audio process that formation single channel data signal is exported to rear end carries out next step
Audio frequency process, the audio merging module 20 in the present embodiment can be fpga chip, or MCU chip.
Audio processing modules 30 after the single channel data signal is received, according to the single channel data signal carry it is same
After the single channel data signal is restored to each passage by step identification signal data, it is possible to carry out follow-up audio frequency process, solve
Having determined is carrying out also needing special configuration multichannel input or output interface when MCVF multichannel voice frequency is processed, and saves development time and cost,
Improve the compatibility of system application.
Apparatus for processing audio of the invention 100, the voice for first being picked up microphone array by analog-to-digital conversion module 10 is believed
Number be converted into multi-path digital signal through ADC, then by audio merging module 20 according to the clock of the multi-path digital signal electricity
Level values receive sequentially inputting for left channel data and right channel data, then the left channel data and right channel data are delayed respectively
After depositing Preset Time, single channel data signal of the output with synchronous identification signal, finally by audio processing modules 30 according to described
The single channel data signal is restored to each passage by synchronous identification signal carries out audio frequency process.Apparatus for processing audio of the invention
100 export to rear end after the multi-path digital signal transacting that is input into for front end by software or hardware mode is for single channel data signal
Reason system, improves the compatibility of system design, saves construction cycle and cost.
Further, reference picture 4, the audio merging module 20 includes：
Receiving unit 21, the multi-path digital signal being input into through IIS is synchronously received with the first sample rate；
Judging unit 22, whether the frame clock for judging the multi-path digital signal is predetermined level, if so, what is then received is more
Railway digital signal is left channel data, if it is not, the multi-path digital signal for then receiving is right channel data；
Switch unit 23, after predetermined interval, switches the channel data type of the multi-path digital signal for receiving.
In the present embodiment, to being changed via ADC after multi-path digital signal when receiving, receiving unit 21 first
According to the group number of ADC, multiple interfaces of CPU, FPGA or MCU of subsequent treatment are connected to by IIS interfaces, according to the first sampling
Rate, namely the sampling transmission rate of standard is synchronously received per data signal input all the way, because every railway digital signal is by two groups
The voice signal analog signal of microphone pickup is converted, and has distinguished left channel data and right channel data, so
When the data signal of multichannel is input into, judging unit 22 is needed to judge whether the frame clock of the railway digital signal is predetermined level, namely
High level in electronic engineering, is that 2.4V-5.0V, low level are 0.0V-0.4V generally for high level for TTL, for
High level is that 4.99-5.0v, low level are 0.0-0.01v for CMOS, if so, the multi-path digital signal for then receiving is left passage
Data, if the multi-path digital signal for otherwise receiving is right channel data, certainly, it is necessary to switch unit 23 after predetermined interval
Switch the channel data type of the multi-path digital signal for receiving, namely after predetermined interval, left channel data switching will be received
To receive right channel data.
With further reference to above-described embodiment, by taking left-justify IIS signals as an example, when LRCK is high level, the DATA data of ADC
It is the data of left passage, when LRCK is low level, DATA data are right channel data；Because the clock of ADC is connected together
, so when LRCK is high, being input into MIC1、MIC3、MIC5、MIC7Deng the left channel data on ADC；It is defeated when LRCK is low
Enter MIC2、MIC4、MIC6、MIC8Deng the right channel data on ADC.
Further, reference picture 4, the audio merging module 20 also includes：
Setup unit 24, according to the left channel data or the number of channels of right channel data that receive, sets the second sample rate；
Buffer unit 25, the left channel data and right channel data that will be sequentially received is cached respectively in sequence, and right
Last group of channel data makees synchronous identifying processing；
Output unit 26, after the preset lime, according to left channel data and right channel data caching sequentially, with described
Second sample rate single channel is exported.
In the present embodiment, when multigroup left channel data or right channel data is received, in addition it is also necessary to the foundation of setup unit 24
The number of channels of the left passage or right passage sets the second sampling road of left channel data and right channel data, namely during output
Speed, order when the left channel data that then will be sequentially received by buffer unit 25 and right channel data are according to input enters
Row caching, and that group data that will be recently entered replace with the synchronous identification data with identification function, it is finally single by output
Unit 26 in caching Preset Time after the meeting, according to the data cached of left channel data and right channel data, with the second of above-mentioned setting
Sample rate is exported from an IIS output interface or PCM output interfaces, and the data setting between two groups of synchronous identification datas is one
Frame section, exports a voice data for frame section every time.
With further reference to above-described embodiment, the left passage or right channel data that synchronization has 6 ADC are input to audio
Merging module 20,25 data being currently received of buffer unit are cached, after the completion of current data reception, by exporting
The data that unit 26 will be received using pcm interface, after general cache 1/2fs, with 6 times of (how many passage just how many times) speed from
Export PCM or IIS interfacing orders to audio frequency processing system；While output is to audio frequency processing system, merging module synchronization
Another channel datas of each ADC are cached, and the data is activation of another passage is also to adopt in a like fashion.
Because the data that audio merging module 20 is given to audio processing modules 30 are transmitted according to channel sequence, it is
The channel recognition of the data that Division identification is transmitted is, it is necessary to last group of data of the right passage sent in PCM, are changed to synchronization
Identification data, that is, sacrifice ADC6Right data, use for synchronous identification, and the data between two synchronous identification datas are considered as
One frame, each frame is exactly the data that each passage is sampled every time, and audio processing modules 30 are according to synchronous identification signal, it is possible to defeated
The single-pass data for going out is restored to each passage and carries out audio frequency process.
Further, first sample rate is set to f1, second sample rate is set to f2, the number of channels is set to n,
Then f2=n*f1, the multi-path digital signal that will also receive is within the identical time with single channel output.
The present invention also proposes a kind of audio frequency processing system, and the audio frequency processing system includes analog-digital converter 200, audio frequency process
Device 300 and apparatus for processing audio 100 as described above, the apparatus for processing audio 100 connect the He of the analog-digital converter 200
Audio process 300, receives the multi-path digital signal of multiple inputs of analog-digital converter 200, output single channel data signal to audio
Processor 300, when audio frequency process is carried out, the voice signal for being picked up microphone array by analog-to-digital conversion module 10 first is through mould
Number converter 200 is converted into multi-path digital signal, then by audio merging module 20 according to the multi-path digital signal clock
Level value receive sequentially inputting for left channel data and right channel data, then by the left channel data and right channel data point
Huan Cun not be after Preset Time, single channel data signal of the output with synchronous identification signal is finally controlled by audio processing modules 30
The single channel data signal is restored to each passage and carries out audio frequency process by audio process 300 according to the synchronous identification signal,
The compatibility of system design is improve, construction cycle and cost is saved.
The preferred embodiments of the present invention are these are only, the scope of the claims of the invention is not thereby limited, it is every to utilize this hair
Equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of audio-frequency processing method, it is characterised in that the audio-frequency processing method is comprised the following steps：
The voice signal that microphone array is picked up is converted into multi-path digital signal；
Receive sequentially inputting for the left channel data in the multi-path digital signal and right channel data；
After the left channel data and right channel data are cached into Preset Time respectively, single channel of the output with synchronous identification signal
Data signal；
The single channel data signal is restored into each passage according to the synchronous identification signal carries out audio frequency process.
2. audio-frequency processing method according to claim 1, it is characterised in that in the reception multi-path digital signal
Left channel data and the step of sequentially inputting of right channel data, specifically include：
The multi-path digital signal being input into through IIS is synchronously received with the first sample rate；
Whether the frame clock for judging the multi-path digital signal is predetermined level, if so, the multi-path digital signal for then receiving is a left side
Channel data, if it is not, the multi-path digital signal for then receiving is right channel data；
After preset interval time, switch the channel data type of the multi-path digital signal for receiving.
3. audio-frequency processing method according to claim 2, it is characterised in that described by left channel data and right channel data
Respectively after caching Preset Time, export the step of with the synchronously single channel data signal of identification signal, specifically include：
According to the left channel data or the number of channels of right channel data that receive, the second sample rate is set；
The left channel data and right channel data that will be sequentially received are cached respectively in sequence, and to last group of channel data
Make synchronous identifying processing；
After the preset lime, according to left channel data and right channel data caching sequentially, with the second sample rate single channel
Output.
4. audio-frequency processing method according to claim 3, it is characterised in that first sample rate is set to f1, described second
Sample rate is set to f2, the number of channels is set to n, then f2=n*f1。
5. a kind of apparatus for processing audio, it is characterised in that the apparatus for processing audio includes：
Analog-to-digital conversion module, multi-path digital signal is converted into by the voice signal that microphone array is picked up；
Audio merging module, receives sequentially inputting for the left channel data in the multi-path digital signal and right channel data, will
The left channel data and right channel data are output as the single channel numeral with synchronous identification signal after caching Preset Time respectively
Signal；
Audio processing modules, being restored to the single channel data signal according to the synchronous identification signal carries out audio on each passage
Treatment.
6. apparatus for processing audio according to claim 5, it is characterised in that the audio merging module includes：
Receiving unit, the multi-path digital signal being input into through IIS is synchronously received with the first sample rate；
Judging unit, whether the frame clock for judging the multi-path digital signal is predetermined level, if so, the multi-path digital for then receiving
Signal is left channel data, if it is not, the multi-path digital signal for then receiving is right channel data；
Switch unit, after predetermined interval, switches the channel data type of the multi-path digital signal for receiving.
7. apparatus for processing audio according to claim 6, it is characterised in that the audio merging module also includes：
Setup unit, according to the left channel data or the number of channels of right channel data that receive, sets the second sample rate；
Buffer unit, the left channel data and right channel data that will be sequentially received is cached respectively in sequence, and to last
Group channel data makees synchronous identifying processing；
Output unit, after the preset lime, according to left channel data and right channel data caching sequentially, adopted with described second
Sample rate single channel is exported.
8. apparatus for processing audio according to claim 7, it is characterised in that first sample rate is set to f1, described second
Sample rate is set to f2, the number of channels is set to n, then f2=n*f1。
9. the apparatus for processing audio according to claim any one of 5-8, it is characterised in that the audio merging module is
Fpga chip or MCU chip.
10. a kind of audio frequency processing system, it is characterised in that the audio frequency processing system include analog-digital converter, audio process and
Apparatus for processing audio as claimed in claim 9, the apparatus for processing audio connects the analog-digital converter and audio process,
Receive the multi-path digital signal of multiple analog-digital converter inputs, output single channel data signal to audio process.
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