CN108470569A - A kind of audio following device and its implementation - Google Patents
A kind of audio following device and its implementation Download PDFInfo
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- CN108470569A CN108470569A CN201810164562.8A CN201810164562A CN108470569A CN 108470569 A CN108470569 A CN 108470569A CN 201810164562 A CN201810164562 A CN 201810164562A CN 108470569 A CN108470569 A CN 108470569A
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- G—PHYSICS
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- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; 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
- G10L19/04—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 using predictive techniques
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; 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
- G10L19/04—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 using predictive techniques
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Abstract
The embodiment of the invention discloses a kind of audio following devices and its implementation, method to include：When audio following device is in mode of learning, the target output parameter of target machine is obtained, and obtains the initial output parameter of audio following device；The filter factor of sef-adapting filter constantly in adjustment digital signal processor, the output parameter of the audio following device after adjustment is identical as target output parameter, preserves the filtering parameter of corresponding sef-adapting filter；When audio following device is in operating mode, the input terminal of the audio following device after adjustment is connect with external audio signal, the output end of audio following device is connect with power amplifier, carries out audio broadcasting.The superperformance of target machine can be transplanted on new product by the embodiment of the present invention, save the design time of engineer, and traditional hardware is replaced using digital signal processor, cost-effective, simplify processing technology.
Description
Technical field
The present invention relates to audio digital signals processing technology field more particularly to a kind of audio following device and its realization sides
Method.
Background technology
In the prior art, in audio area, two audio devices is frequently encountered and measure the common counter come, such as noise
Than harmonic distortion and frequency response etc. are all identical.But in tone color, but it is very different, or even same audio dress
Set the wrong electronic component of weldering or when design circuit board there are one component slightly moved some positions, all can be
No small difference is brought in tone color.Exactly because this spy that can not embody the product with rigid index completely of audio devices
Property, the characteristic of good product is all difficult to be transplanted on new product, even if the performance of new product is still defective after having transplanted, sound
Performance after the production of frequency device is poor, and being used for user also makes troubles.
Invention content
It in view of the above technical problems, can an embodiment of the present invention provides a kind of audio following device and its implementation
It solving in audio devices production process in the prior art, the performance portability of product is poor, the technical issues of.
The first aspect of the embodiment of the present invention provides a kind of audio following device, including：
Analog-digital converter, digital signal processor, memory, microcontroller and digital analog converter, the number
Word signal processor is connect with the analog-digital converter, memory, microcontroller and digital analog converter respectively；
The analog-digital converter is used to the analog audio signal received be converted to digital audio and video signals, is transmitted to
Digital signal processor；
The digital signal processor is for after being filtered the digital audio and video signals received, being sent to digital mould
Quasi- converter；
The digital analog converter exports after the digital audio and video signals after being filtered are converted into analogue audio frequency；
The memory is used to store the primary data of audio following device；
The microcontroller stores filtering data for the pattern of audio following device to be switched over and controlled.
Preferably, for the audio following device there are two types of operational mode, described two operational modes are mode of learning and work
Operation mode.
Preferably, the digital signal processor is additionally operable to obtain the filter coefficient life being calculated under mode of learning
At sef-adapting filter, adjust the filter coefficient of sef-adapting filter, until the audio following device output parameter with
The target output parameter of target machine is identical.
Preferably, the primary data includes initial parameter and initial code, and the initial parameter is audio following device
Initial output parameter, the initial code is the initial code and allocating digital signal processor of digital signal processor
The configuration code of hardware.
Preferably, the filtering data includes key code and key parameter, and the key code is under mode of learning
Test the filtering generation that filtering is realized under test code, the calculation code for calculating filter coefficient and the normal mode of output parameter
Code, key parameter is the filter parameter calculated under mode of learning.
Second aspect of the embodiment of the present invention provides a kind of implementation method of audio following device, including：
When audio following device is in mode of learning, obtain the target output parameter of target machine, and obtain audio with
With the initial output parameter of device；
The filter factor of sef-adapting filter constantly in adjustment digital signal processor, the audio after adjustment follow
The output parameter of device is identical as target output parameter, preserves the filtering parameter of corresponding sef-adapting filter；
When audio following device is in operating mode, by the input terminal and external audio of the audio following device after adjustment
Signal connects, and the output end of audio following device is connect with power amplifier, carries out audio broadcasting.
Preferably, the target output parameter for obtaining target machine, including：
Pre-set audio following device output end and target machine input terminal connect, the output end of target machine with
The input terminal of audio following device connects；
Digital signal processor generates internal audio signal, and internal audio signal is exported to target machine；
The input terminal record of audio following device, will be by the sound of target machine by the first audio signal of target machine
The audio signal that frequency signal is generated with digital signal processor is compared and is analyzed, and the target output ginseng of target machine is extracted
It counts and preserves.
Preferably, the initial output parameter for obtaining audio following device, including：
The output end for pre-setting audio following device is connect with the input terminal of audio following device；
Digital signal processor generates internal audio signal, and internal audio signal is exported to the input of audio following device
End；
Second audio signal of the input terminal record audio signal output end output of audio following device, according to the second audio
Signal calculates the initial output parameter of audio following device.
Preferably, the target output parameter includes signal-to-noise ratio, harmonic distortion, dynamic range, the frequency sound of target machine
Answer, phase-frequency response, envelope and transmission function.
Preferably, the initial output parameter includes signal-to-noise ratio, harmonic distortion, dynamic range, the frequency of audio following device
Rate response, phase-frequency response, envelope and transmission function.
In technical solution provided in an embodiment of the present invention, when audio following device is in mode of learning, target machine is obtained
The target output parameter of device, and obtain the initial output parameter of audio following device；Constantly in adjustment digital signal processor
The output parameter of the filter factor of sef-adapting filter, the audio following device after adjustment is identical as target output parameter,
Preserve the filtering parameter of corresponding sef-adapting filter；When audio following device is in operating mode, by the audio after adjustment
The input terminal of following device is connect with external audio signal, and the output end of audio following device is connect with power amplifier, is carried out audio and is broadcast
It puts.Therefore compared with the existing technology, the embodiment of the present invention, which can be realized, is transplanted to the superperformance of target machine on new product, section
The about design time of engineer replaces traditional hardware using digital signal processor, cost-effective, simplifies processing technology,
The power consumption of audio following device reduces, energy saving.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of an embodiment of audio following device in the embodiment of the present invention；
Fig. 2 is a kind of flow signal of another embodiment of the implementation method of audio following device in the embodiment of the present invention
Figure.
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, it is clear that 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, the every other implementation that those skilled in the art are obtained without creative efforts
Example, shall fall within the protection scope of the present invention.
Referring to Fig. 1, Fig. 1 is a kind of structural representation of one embodiment of audio following device in the embodiment of the present invention
Figure.As shown in Figure 1, audio following device 1 include analog-digital converter 100, digital signal processor 200, memory 300,
Microcontroller 400 and digital analog converter 500, digital signal processor respectively with analog-digital converter, memory, micro-control
Device processed is connected with digital analog converter；
Analog-digital converter 100 is used to the analog audio signal received be converted to digital audio and video signals, is transmitted to
Digital signal processor；Digital signal processor 200 is for after being filtered the digital audio and video signals received, being sent to
Digital analog converter；Digital audio and video signals after being filtered are converted into defeated after analogue audio frequency by digital analog converter 500
Go out；Memory 300 is used to store the primary data of audio following device；Microcontroller 400 is used for the mould to audio following device
Formula is switched over and is controlled, and stores filtering data.
Specifically, analog-digital converter (Analog-to-Digital Converter, english abbreviation ADC) is connecing
The analog audio signal received is converted to digital signal, is transferred to digital signal processor (Digital Signal
Processing, abbreviation English are DSP) processing.The digital audio and video signals handled are transferred to number by digital signal processor DSP
Word analog converter (Digital to analog converter, english abbreviation DAC).Wherein, digital signal processor
DSP is further connected with flash memory Flash and single-chip microprocessor MCU.Signal generator is additionally provided in digital audio processor, for producing
The raw internal audio signal for test.
Preferably, audio following device is mode of learning and operating mode there are two types of operational mode, two kinds of operational modes.Number
Word signal processor is additionally operable to obtain the filter coefficient generation sef-adapting filter being calculated under mode of learning, and adjustment is certainly
The filter coefficient of adaptive filter, until the target output parameter phase of the output parameter and target machine of audio following device
Together.
Specifically, mode of learning is used to obtain the target output parameter of target machine, and obtains the first of audio following device
Beginning output parameter constantly adjusts the filter factor of the sef-adapting filter in digital signal processor, the audio after adjustment
The output parameter of following device is identical as target output parameter, preserves the filtering parameter of corresponding sef-adapting filter.Working mould
The input terminal of audio following device after formula is used to adjust is connect with external audio signal, the output end of audio following device and
Power amplifier connects, and carries out audio broadcasting.
Preferably, primary data includes initial parameter and initial code, and initial parameter is the initial defeated of audio following device
Go out parameter, initial code is the configuration generation of the initial code of digital signal processor and the hardware of allocating digital signal processor
Code.
When it is implemented, when primary data audio following device is straight-through, the initial output parameter of audio following device itself,
Such as signal-to-noise ratio, harmonic distortion, dynamic range, frequency response, phase-frequency response.The specific function of the store code is initialization
The configuration code of peripheral hardware on the initial code of DSP, and the hardware of configuration DSP.
Preferably, filtering data includes key code and key parameter, and the key code is the test under mode of learning
The test code of output parameter, the calculation code for calculating filter coefficient and the filter code that filtering is realized under normal mode,
Key parameter is the filter parameter calculated under mode of learning.
Specifically, filtering data includes key code and key parameter, other machines are tested when key code is mode of learning
The code of filtering is realized when the code and normal mode of operation of device parameter and calculating filter coefficient.Key parameter is different
The filter parameter calculated under the different settings of machine.
Referring to Fig. 2, Fig. 2 is a kind of another embodiment of the implementation method of audio following device in the embodiment of the present invention
Flow diagram.As shown in Fig. 2, the implementation method of the audio following device of the embodiment of the present invention, including：
Step S100, when audio following device is in mode of learning, the target output parameter of target machine is obtained, and is obtained
Take the initial output parameter of audio following device；
Step S200, the filter factor of the sef-adapting filter constantly in adjustment digital signal processor, after adjustment
Audio following device output parameter it is identical as target output parameter, preserve the filtering parameter of corresponding sef-adapting filter；
Step S300, when audio following device is in operating mode, by the input terminal of the audio following device after adjustment
It is connect with external audio signal, the output end of audio following device is connect with power amplifier, carries out audio broadcasting.
When it is implemented, initial output parameter includes signal-to-noise ratio, harmonic distortion, dynamic range, the frequency of audio following device
Rate response, phase-frequency response, envelope and transmission function.Target output parameter includes the signal-to-noise ratio of target machine, harmonic distortion, moves
State range, frequency response, phase-frequency response, envelope and transmission function.
Then, the filter that an auxiliary is added in the digital signal processor (DSP) of audio following device, for changing
Tone color.The method that Step wise approximation is taken in the design of the filter constantly adjusts the coefficient of filter, until entire audio follows
The characteristic of device is essentially the same with the characteristic of target machine.The coefficient of filter is adjusted by adaptive algorithm.For example, some frequency
High 1.5dB of the frequency response of point than machine.Specially the frequency of the frequency point will be rung when Design assistant filter
1.5dB should be dragged down.After one frequency point has been calculated, then next frequency point is calculated, the frequency for infinitely approaching target machine is then gone to ring
It answers.Frequency response calculation：The swept-frequency signal of a 0dB is generated by the signal generator inside audio following device DSP,
It is output to the input of target machine, and the output of target machine is taken back the input of audio following device.Audio following device
There are one sine wave root mean square (Root Mean Square, english abbreviation are) detection modules for meeting inside DSP, target machine pair
The RMS level recordings for each frequency point answered simultaneously preserve.Before this, the ginseng of frequency response when audio following device is straight-through
It counts inside just saved Flash.Ask poor by corresponding frequency point level value, so that it may to analyze the frequency response of target machine
With difference of audio following device when straight-through on which Frequency point.
External sound source signal being connected to the input terminal of audio following device, the output of audio following device terminates to power amplifier,
Speaker.The extension filter finally calculated under mode of learning is added in normal mode inside audio following device, and
And it preserves.In this way, input signal can be with original after the processing of the digital signal processor DSP of audio following device
Machine tone color various aspects it is almost the same.
Preferably, the target output parameter of target machine is obtained, including：
Pre-set audio following device output end and target machine input terminal connect, the output end of target machine with
The input terminal of audio following device connects；
Digital signal processor generates internal audio signal, and internal audio signal is exported to target machine；
The input terminal record of audio following device, will be by the sound of target machine by the first audio signal of target machine
The audio signal that frequency signal is generated with digital signal processor is compared and is analyzed, and the target output ginseng of target machine is extracted
It counts and preserves.
When it is implemented, internal audio signal includes pink noise and swept-frequency signal.Producing method：In audio following device
The MCU in face can send out an order to DSP so that DSP generates pink noise.The frequency component power of pink noise is mainly distributed
In middle low-frequency range.Pink noise is the signal or process of a frequency spectrum being inversely proportional with frequency with power spectral density.Frequency sweep is believed
Number frequency range be 20Hz~20kHz.The output of audio following device terminates to the input terminal of target machine, then by target
The output end of machine takes back the input terminal of audio following device.And it is generated by the signal generator inside audio following device
Audio signal is output to target machine.Meanwhile the input terminal of audio following device, the first audio signal by target machine
It records.Then, audio following device with passing through the signal of itself is compared the signal of target machine and analyze.Extraction
Go out the spies such as signal-to-noise ratio, harmonic distortion, dynamic range, frequency response, phase-frequency response, envelope and the transmission function of target machine
Property, and save.
Preferably, the target output parameter of target machine is obtained, including：
Pre-set audio following device output end and target machine input terminal connect, the output end of target machine with
The input terminal of audio following device connects；
Digital signal processor generates internal audio signal, and internal audio signal is exported to target machine；
The input terminal record of audio following device, will be by the sound of target machine by the first audio signal of target machine
The audio signal that frequency signal is generated with digital signal processor is compared and is analyzed, and the target output ginseng of target machine is extracted
It counts and preserves.
When it is implemented, the output of audio following device to be terminated to the input terminal of audio following device.And by audio
Signal generator inside following device generates internal audio signal output end to the input terminal of audio following device.Meanwhile sound
The input terminal of frequency following device gets off the second audio signal recording that output end exports, and calculates audio following device
The characteristics such as signal-to-noise ratio, harmonic distortion, dynamic range, frequency response, phase-frequency response, envelope and transmission function.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each implementation
Technical solution recorded in example is modified or equivalent replacement of some of the technical features；And these modification or
It replaces, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of audio following device, which is characterized in that including analog-digital converter, digital signal processor, memory, micro-
Controller and digital analog converter, the digital signal processor respectively with the analog-digital converter, memory, micro-control
Device processed is connected with digital analog converter；
The analog-digital converter is used to the analog audio signal received be converted to digital audio and video signals, is transmitted to number
Signal processor；
The digital signal processor turns for after being filtered the digital audio and video signals received, being sent to digital simulation
Parallel operation；
The digital analog converter exports after the digital audio and video signals after being filtered are converted into analogue audio frequency；
The memory is used to store the primary data of audio following device；
The microcontroller stores filtering data for the pattern of audio following device to be switched over and controlled.
2. audio following device according to claim 1, which is characterized in that there are two types of run mould for the audio following device
Formula, described two operational modes are mode of learning and operating mode.
3. audio following device according to claim 2, which is characterized in that the digital signal processor is additionally operable to obtain
The filter coefficient being calculated under mode of learning generates sef-adapting filter, adjusts the filter system of sef-adapting filter
Number, until the output parameter of the audio following device is identical as the target output parameter of target machine.
4. audio following device according to claim 3, which is characterized in that the primary data include initial parameter and just
Beginning code, the initial parameter are the initial output parameter of audio following device, and the initial code is digital signal processor
Initial code and allocating digital signal processor hardware configuration code.
5. audio following device according to claim 4, which is characterized in that the filtering data includes key code and pass
Bond parameter, the key code are the test code of the test output parameter under mode of learning, calculate the calculating of filter coefficient
Realize that the filter code of filtering, key parameter are the filter parameter calculated under mode of learning under code and normal mode.
6. a kind of implementation method based on audio following device described in claim 1, which is characterized in that including：
When audio following device is in mode of learning, the target output parameter of target machine is obtained, and obtains audio and follows dress
The initial output parameter set；
The filter factor of sef-adapting filter constantly in adjustment digital signal processor, the audio following device after adjustment
Output parameter it is identical as target output parameter, preserve the filtering parameter of corresponding sef-adapting filter；
When audio following device is in operating mode, by the input terminal and external audio signal of the audio following device after adjustment
Connection, the output end of audio following device are connect with power amplifier, carry out audio broadcasting.
7. the implementation method of audio following device according to claim 6, which is characterized in that the acquisition target machine
Target output parameter, including：
The input terminal of the output end and target machine that pre-set audio following device connects, the output end and audio of target machine
The input terminal of following device connects；
Digital signal processor generates internal audio signal, and internal audio signal is exported to target machine；
The input terminal record of audio following device will be believed by the first audio signal of target machine by the audio of target machine
Number with digital signal processor generate audio signal compared and analyzed, extract the target output parameter of target machine simultaneously
It preserves.
8. the implementation method of audio following device according to claim 7, which is characterized in that the acquisition audio follows dress
The initial output parameter set, including：
The output end for pre-setting audio following device is connect with the input terminal of audio following device；
Digital signal processor generates internal audio signal, and internal audio signal is exported to the input terminal of audio following device；
Second audio signal of the input terminal record audio signal output end output of audio following device, according to the second audio signal
Calculate the initial output parameter of audio following device.
9. the implementation method of audio following device according to claim 8, which is characterized in that the target output parameter packet
Include signal-to-noise ratio, harmonic distortion, dynamic range, frequency response, phase-frequency response, envelope and the transmission function of target machine.
10. the implementation method of audio following device according to claim 9, which is characterized in that the initial output parameter
Signal-to-noise ratio, harmonic distortion, dynamic range, frequency response, phase-frequency response, envelope including audio following device and transmission letter
Number.
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| CN114885249A (en) * | 2022-07-11 | 2022-08-09 | 广州晨安网络科技有限公司 | User following type directional sounding system based on digital signal processing |
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