CN103796136B - Equipment and method for ensuring output loudness and tone quality of different sound effect modes - Google Patents
Equipment and method for ensuring output loudness and tone quality of different sound effect modes Download PDFInfo
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- CN103796136B CN103796136B CN201210424656.7A CN201210424656A CN103796136B CN 103796136 B CN103796136 B CN 103796136B CN 201210424656 A CN201210424656 A CN 201210424656A CN 103796136 B CN103796136 B CN 103796136B
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10037—A/D conversion, D/A conversion, sampling, slicing and digital quantisation or adjusting parameters thereof
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10305—Improvement or modification of read or write signals signal quality assessment
- G11B20/10314—Improvement or modification of read or write signals signal quality assessment amplitude of the recorded or reproduced signal
Abstract
Provided are equipment and method for ensuring output loudness and tone quality of different sound effect modes. The equipment comprises a gain setting unit used for setting a protective limiting value of output voltage of input audio signals; a sound effect mode filter used for performing filtering on the input audio signals to realize different sound effect modes; an amplitude real-time processing mode used for receiving audio signals output by the sound effect mode filter or audio signals fed back by itself, and processing the received audio signals and enabling output voltage of the processed audio signals to be smaller than the protective limiting value; and an digital-to-analog converter used for performing digital-to-analog conversion on the processed audio signals whose output voltage is smaller than the protective limiting value, and outputting analog audio signals.
Description
Technical field
The present invention relates to Audio Signal Processing, more particularly, it is related to one kind and under max volume, audio pattern is strengthened
Frequency band carry out dynamic process of auditory perceptual to ensure that different audio patterns export equipment and the method for loudness and tonequality.
Background technology
With the development of technology, in addition to traditional audio-frequence player device, increasing mobile device (for example, handss
Machine) there is music playing function.When playing music, different audio patterns (normal, classic, popular, rural, rock and roll etc.) is
In some frequency ranges, line amplitude amplification or the realization that decays are entered to original sound signal.Generally, the allocation plan of different audio patterns
Obtained by frequency response curve measurement.
When listening to music in the case that external environment is noisy, user typically requires raising volume and just can catch.Logical
Often need to increase the amplification of power amplifier, improve output voltage to reach the purpose improving volume.However, whether raising
Sound device or earphone, the voltage exceeding rated power is likely to result in that microphone device is overheated to be burnt.On the other hand, using sound during earphone
Amount is too high to cause damage to hearing user.For protecting hearing user, avoiding microphone device to damage, it usually needs management acoustical generator
Part be operated in max volume setting when voltage effective value or sound pressure level so as to (hereinafter referred to as protect less than a specific limits value
Shield limit value).
In the case of closing for audio pattern, frequency response curve is flat.But for other patterns, frequency is rung
Curve is answered to have the difference of+6dB.The first traditional method is arranged according to the situation (when equalizer curve is flat) that audio pattern is closed
Gain under max volume, makes output be less than protection limit value.But because some audio modal balance curves are higher than flat equalizer curve,
Output voltage yet suffers from exceeding the possibility of protection limit value.Second tradition traditional method and the first traditional method set-up mode
Identical, reduce protection limit value -6dB, make output be less than this limit value.So, any audio pattern and volume when closing audio pattern
Less compared with the first traditional method, it is unable to reach equal signal to noise ratio under noise circumstance it is impossible to realize equal tonequality.The third passes
System method is identical with the first traditional method set-up mode when audio pattern is closed, and reduces protection limit when audio pattern is opened
Value -6dB, makes output be less than this limit value.When so can lead to switch audio mode switch there is saltus step in volume.In addition, above three
Plant traditional method cannot ensure using output when sound field pattern (as Echoenhance, 3D audio) less than protection limit value.Figure 1A is to figure
1C shows the frequency response curve in three of the above traditional method.
Content of the invention
Accordingly, it is desired to provide a kind of audio processing equipment and method, still open so as not to close by audio pattern, for
Output can reduce output amplitude automatically beyond the situation of protection limit value, be obtained in that due output rings in sense of hearing simultaneously
Degree, ensures the tonequality under noise circumstance.
According to an aspect of the present invention, a kind of equipment ensureing that different audio pattern exports loudness and tonequality is provided, including：
Gain arranging unit, for the protection limit value of the output voltage of the audio signal of setting input；Audio mode filter, for right
The audio signal of input is filtered to realize different audio patterns；Amplitude real-time processing module, for receiving the filter of audio pattern
Ripple device output audio signal or itself feedback audio signal, and to receive audio signal processed so that being processed after
Audio signal output voltage be less than protection limit value；Digital to analog converter, for being less than protection limit to the output voltage after processing
The audio signal of value carries out digital-to-analogue conversion, and exports simulated audio signal.
Additionally, amplitude real-time processing module may include：Amplitude detection module, for detecting the audio signal of described reception
Magnitude of voltage；Psychoacousticss amplitude processing module, for the magnitude of voltage according to the audio signal detecting, optionally connects to described
The audio signal execution signal of receipts leads directly at least one of process, harmonic wave extraction process and decay protection process, so that processing
The output voltage of audio signal afterwards is less than protection limit value.
Additionally, psychoacousticss amplitude processing module may include：Amplitude frequency-domain analysiss module, detects according to amplitude detection module
To audio signal magnitude of voltage the audio signal of described reception is analyzed with determine energy concentrate frequency band；Bandreject filtering
Device, the special frequency band of the audio signal of the described reception that decays；First band filter is it is allowed to the spy of the audio signal of described reception
Determine frequency band to pass through；Predistortion module, for producing the integral frequency harmonizing wave of the audio signal of the first band filter output；Second band
Bandpass filter group, for extracting second harmonic and the triple-frequency harmonics of the audio signal that the first band filter exports；Blender, uses
In the audio signal of audio signal and the second band filter group output of superposition band elimination filter output, and after exporting superposition
Audio signal.
Additionally, the second band filter group may include the secondary of the audio signal for extracting the first band filter output
Second band filter of harmonic wave and the 3rd band for extracting the triple-frequency harmonics of audio signal of the first band filter output
Bandpass filter.
Additionally, protecting when the magnitude of voltage that amplitude frequency-domain analysiss module determines the audio signal that amplitude detection module detects is more than
During shield limit value, amplitude frequency-domain analysiss module can be analyzed to the audio signal of audio mode filter output to determine energy quantity set
In frequency band, the bandwidth of band elimination filter, the first band filter and the second band filter group is arranged in quantity set
The bandwidth of frequency band, so that the frequency band that attenuation of band-stop filter energy is concentrated, the frequency band that the first band filter permission energy is concentrated
Pass through, the second band filter group extracts the second harmonic of frequency band and the triple-frequency harmonics that energy is concentrated, the resistance filter of blender stacked tape
The audio signal that the audio signal of ripple device output is exported with the second band filter group, and export the audio signal after superposition, from
And psychoacousticss amplitude processing module execution harmonic wave extraction process.
Additionally, after psychoacousticss amplitude processing module execution harmonic wave extraction process, amplitude detection module can detect humorous
The output voltage values of the audio signal after ripple extraction process and by the audio signal back after harmonic wave extraction process to psychoacousticss
Amplitude processing module.
Additionally, audio frequency letter after amplitude frequency-domain analysiss module determines the harmonic wave extraction process that amplitude detection module detects
Number magnitude of voltage be more than protection limit value when, amplitude frequency-domain analysiss module can to feedback harmonic wave extraction process after audio signal enter
Row analysis to determine the frequency band that energy is concentrated again, and by band elimination filter, the first band filter and the second band filter
The bandwidth of group is arranged to the bandwidth of the frequency band in quantity set, so that the frequency band that attenuation of band-stop filter energy is concentrated, the first band logical
Wave filter allows the frequency band that energy is concentrated to pass through, and the second band filter group extracts the second harmonic of frequency band and three that energy is concentrated
Subharmonic, blender is superimposed the audio signal of band elimination filter output and the audio signal of the second band filter group output, and
Audio signal after output superposition, thus psychoacousticss amplitude processing module executes harmonic wave extraction process again.
Additionally, after psychoacousticss amplitude processing module executes harmonic wave extraction process again, amplitude detection module can be examined
Survey the output voltage values of the audio signal after harmonic wave extraction process again.
Additionally, the output voltage values of audio signal after amplitude detection module detects harmonic wave extraction process again are more than
During protection limit value, amplitude detection module can detect according to before psychoacousticss amplitude processing module execution harmonic wave extraction process
The magnitude of voltage of audio signal and protection limit value determine fading gain.
Additionally, when amplitude frequency-domain analysiss module receives the fading gain of amplitude detection module determination, amplitude frequency domain divides
The gain of the first band filter and the second band filter group can be set to infinitesimal, by the increasing of band elimination filter by analysis module
Benefit is set to fading gain, and makes the audio signal Whole frequency band that audio mode filter exports pass through band elimination filter, thus the heart
Reason acoustic amplitude processing module execution decay protection is processed.
Additionally, protecting when the magnitude of voltage that amplitude frequency-domain analysiss module determines the audio signal that amplitude detection module detects is less than
During shield limit value, the gain of the first band filter and the second band filter group can be set to infinite by amplitude frequency-domain analysiss module
Little, the gain of band elimination filter is set to 0dB, and so that the audio signal Whole frequency band that audio mode filter exports is hindered by band
Wave filter, thus psychoacousticss amplitude processing module execution signal leads directly to and processes.
According to a further aspect in the invention, a kind of method ensureing that different audio patterns export loudness and tonequality, bag are provided
Include：The protection limit value of the output voltage of audio signal of (a) setting input；B () is filtered to input audio signal to realize
Different audio patterns；C () is processed to the audio signal receiving, so that the output voltage of the audio signal after processing is less than protecting
Shield limit value；D audio signal that () is less than protection limit value to the output voltage after processing carries out digital-to-analogue conversion, and exports analogue audio frequency
Signal, wherein, the audio signal after process is fed back, thus the audio signal receiving described in step (c) is filtered sound
Audio signal after the process of frequency signal or feedback.
Additionally, step (c) may include：Detect the magnitude of voltage of the audio signal of described reception；According to the audio frequency letter detecting
Number magnitude of voltage, optionally the audio signal of described reception execution signal is led directly to process, harmonic wave extraction process and decay are protected
At least one of shield process, so that the output voltage of the audio signal after processing is less than protection limit value.
Additionally, step (c) may also include：The audio signal to described reception for the magnitude of voltage according to the audio signal detecting
It is analyzed to determine the frequency band that energy is concentrated；The special frequency band of the audio signal by receiving described in attenuation of band-stop filter；
The special frequency band being allowed the audio signal of described reception by the first band filter is passed through；Produce the first band filter output
Audio signal integral frequency harmonizing wave；Extract the audio signal of the first band filter output by the second low pass filter group
Second harmonic and triple-frequency harmonics；The audio signal being superimposed band elimination filter output by blender is defeated with the second band filter group
The audio signal going out, and export the audio signal after superposition.
Additionally, the second band filter group may include the secondary of the audio signal for extracting the first band filter output
Second band filter of harmonic wave and the 3rd band for extracting the triple-frequency harmonics of audio signal of the first band filter output
Bandpass filter.
Additionally, in step (c), when the magnitude of voltage of the audio signal detecting is more than protection limit value, can be to filtering after
Audio signal be analyzed with determine energy concentrate frequency band, and by band elimination filter, the first band filter and second band
The bandwidth of bandpass filter group is arranged to the bandwidth of the frequency band in quantity set, so that the frequency band that attenuation of band-stop filter energy is concentrated,
First band filter allows the frequency band that energy is concentrated to pass through, and the second band filter group extracts the secondary of the frequency band that energy is concentrated
Harmonic wave and triple-frequency harmonics, the audio signal of superposition band elimination filter output and the audio signal of the second band filter group output,
And export the audio signal after superposition, thus execute harmonic wave extraction process.
Additionally, in step (c), the magnitude of voltage of the audio signal after harmonic wave extraction process detecting is more than protection limit
During value, the audio signal after the harmonic wave extraction process of feedback can be analyzed to determine the frequency band that energy is concentrated again, and will
The bandwidth of band elimination filter, the first band filter and the second band filter group is arranged to the bandwidth of the frequency band in quantity set,
So that attenuation of band-stop filter energy concentrate frequency band, first band filter allow energy concentrate frequency band pass through, second band
Bandpass filter group extracts the second harmonic of frequency band and the triple-frequency harmonics that energy is concentrated, and blender is superimposed the sound of band elimination filter output
Frequency signal and the audio signal of the second band filter group output, and export the audio signal after superposition, thus executing humorous again
Ripple extraction process.
Additionally, in step (c), the output voltage values of audio signal after harmonic wave extraction process again is detected are more than
During protection limit value, the gain of the first band filter and the second band filter group can be set to infinitesimal, by bandreject filtering
The gain of device is set to fading gain, and makes filtered audio signal Whole frequency band pass through band elimination filter, thus executing decay
Protection is processed, wherein, according to the magnitude of voltage of audio signal detecting before execution harmonic wave extraction process and protection limit value
To determine described fading gain.
Additionally, wherein, in step (c), when the magnitude of voltage of the audio signal detecting is less than protection limit value, can be by the
The gain of one band filter and the second band filter group is set to infinitesimal, and the gain of band elimination filter is set to 0dB,
And make filtered audio signal Whole frequency band pass through band elimination filter, process thus executing signal and leading directly to.
Brief description
By the description below in conjunction with the accompanying drawings embodiment being carried out, these and/or other aspect of the present invention and advantage will
Can be made apparent from and it is more readily appreciated that wherein：
Figure 1A to Fig. 1 C shows the frequency response curve of three of the above traditional method
Fig. 2 is the block diagram illustrating traditional equipment of execution audio mode treatment；
Fig. 3 is the frame illustrating the according to embodiments of the present invention equipment ensureing different audio patterns output loudness and tonequality
Figure；
Fig. 4 is the frame of the psychoacousticss amplitude processing module illustrating that the amplitude real-time processing module shown in Fig. 3 includes
Figure；
Fig. 5 is the flow process illustrating the according to embodiments of the present invention method ensureing different audio patterns output loudness and tonequality
Figure.
Specific embodiment
Now the embodiment of the present invention is described in detail, its example is illustrated in the accompanying drawings, wherein, identical label begins
Represent same parts eventually.Below with reference to the accompanying drawings embodiment is described to explain the present invention.
Fig. 2 is the block diagram illustrating traditional equipment of execution audio mode treatment.
As shown in Fig. 2 gain arranging unit arranges the maximum gain of the audio signal (digital audio and video signals) allowing to pass through,
Audio mode filter is filtered to the audio signal of input to realize different audio patterns, and digital to analog converter is to audio pattern
The audio signal of the different audio patterns of wave filter output carries out digital-to-analogue conversion, and exports simulated audio signal.However, in Fig. 2
There are the various defects described in background section in the equipment of the traditional execution audio mode treatment illustrating.
Fig. 3 is the frame illustrating the according to embodiments of the present invention equipment ensureing different audio patterns output loudness and tonequality
Figure.
With reference to Fig. 3 it is ensured that different audio pattern exports loudness and the equipment of tonequality includes gain arranging unit 10, audio mould
Formula wave filter 20, amplitude real-time processing module 30 and digital to analog converter 40.Gain arranging unit 10 receives digital audio and video signals, and
The protection limit value of the output voltage of audio signal of setting input.Audio mode filter 20 is filtered to the audio signal of input
Ripple is to realize different audio patterns.Amplitude real-time processing module 30 receive audio mode filter 20 output audio signal or
The audio signal of itself feedback, and the audio signal receiving is processed so that the output voltage of audio signal after being processed is little
In protection limit value.The audio signal that digital to analog converter 40 is less than protection limit value to the output voltage after processing carries out digital-to-analogue conversion,
And export simulated audio signal.As shown in figure 3, amplitude real-time processing module 30 includes psychoacousticss amplitude processing module 31 and width
Degree detection module 32.The magnitude of voltage of the audio signal that amplitude detection module 32 detection receives.Psychoacousticss amplitude processing module 31
The magnitude of voltage of the audio signal being detected according to amplitude detection module 32, optionally to audio signal (that is, the audio mould receiving
Formula wave filter 20 output audio signal or amplitude real-time processing module 30 itself feedback audio signal) execution signal lead directly to
At least one of process, harmonic wave extraction process and decay protection process, so that the output voltage of the audio signal after processing
Less than protection limit value.Referring to Fig. 4, the signal of the structure of psychoacousticss amplitude processing module 31 and its execution is led directly to process,
Harmonic wave extraction process and decay protection process and are described in detail.
Fig. 4 is to illustrate the psychoacousticss amplitude processing module 31 that the amplitude real-time processing module 30 shown in Fig. 3 includes
Block diagram.
With reference to Fig. 4, psychoacousticss amplitude processing module 31 include amplitude frequency-domain analysiss module 310, band elimination filter 320,
First band filter 330, predistortion module 340, the second band filter group 350 and blender 360.Amplitude frequency-domain analysiss mould
The magnitude of voltage of the audio signal that block 310 detects according to amplitude detection module 32 is analyzed to the audio signal receiving to determine
The frequency band that energy is concentrated.Additionally, amplitude frequency-domain analysiss module 310 is always according to the magnitude of voltage setting band resistance of the audio signal detecting
The bandwidth of wave filter 320, the first band filter 330 and the second band filter group 350 and gain.Band elimination filter 320
The special frequency band of the audio signal that decay receives, the first band filter 330 allows the special frequency band of the audio signal receiving to lead to
Cross, predistortion module 340 produces the integral frequency harmonizing wave of the audio signal of the first band filter 330 output, the second bandpass filtering
Device group 350 extracts the second harmonic of audio signal and the triple-frequency harmonics of the first band filter 330 output.Blender 360 is superimposed
The audio signal of audio signal and the second band filter group 350 output of band elimination filter 320 output, and after exporting superposition
Audio signal.As shown in figure 4, the second band filter group 350 may include the second band filter 351 and the 3rd band filter
352, wherein, the second band filter 351 extracts the second harmonic of the audio signal of predistortion module 340 output, the 3rd band logical
Wave filter 352 extracts the triple-frequency harmonics of the audio signal of predistortion module 340 output.According to embodiments of the invention, predistortion
Module 340 can be realized in many ways.For example, Erik Larsen and Ronald M.Aarts is written《Audio
Bandwidth Extension-Application of Psychoacoustics, Signal Processing and
LoudspeakerDesign》Different predistortion devices are had been discussed.
When the magnitude of voltage of the audio signal that amplitude detection module 32 detects is more than protection limit value, at psychoacousticss amplitude
Reason module 31 will execute harmonic wave extraction process.Specifically, when amplitude frequency-domain analysiss module 310 determines that amplitude detection module 32 is examined
When the magnitude of voltage of the audio signal measuring is more than protection limit value, amplitude frequency-domain analysiss module 310 is defeated to audio mode filter 20
The audio signal going out is analyzed to determine the frequency band that energy is concentrated, and by band elimination filter 320, the first band filter 330
Set with the bandwidth (that is, the bandwidth of the second band filter 351 and the 3rd band filter 352) of the second band filter group 350
It is set to the bandwidth of the frequency band of energy concentration.So, the frequency band that band elimination filter 320 damping capacity is concentrated, the first band filter
The frequency band that 330 permission energy are concentrated passes through, and the second band filter group 350 extracts the second harmonic of frequency band and three that energy is concentrated
Subharmonic, blender 360 is superimposed the audio signal of band elimination filter 320 output and the sound of the second band filter group 350 output
Frequency signal, and export the audio signal after superposition, thus executing harmonic wave extraction process.For example, if signal energy concentrates on
800-1.2kHz (bandwidth 400Hz), then the mid frequency of the first band filter 330 is 1kHz, and passband is 800-1.2kHz, band
A width of 400Hz.Now, the mid frequency 2kHz of second harmonic, then corresponding second band filter 351 passband is 1.8kHz-
2.2kHz, carries a width of 400Hz.The mid frequency 3kHz of triple-frequency harmonics, corresponding 3rd band filter 352 passband is
2.8kHz-3.2kHz, carries a width of 400Hz.Band elimination filter 320 decay 800-1.2kHz (bandwidth 400Hz).On the other hand, carry
The gain of resistance wave filter 320, the first band filter 330 and the second band filter group 350 all may be configured as 0dB.May be selected
Ground, the gain of band elimination filter 320, the first band filter 330 and the second band filter group 350 can be according to actual audition
Effect is arranged in the range of ± 6dB.
If the output voltage of the audio signal after psychoacousticss amplitude processing module 31 executes harmonic wave extraction process
Value can be held to the audio signal after harmonic wave extraction process again still greater than protection limit value, then psychoacousticss amplitude processing module 31
Row harmonic wave extraction process.Specifically, after psychoacousticss amplitude processing module 31 execution harmonic wave extraction process, amplitude detection
Module 32 can detect harmonic wave extraction process after the output voltage values of audio signal and can by after harmonic wave extraction process audio frequency believe
Number feed back to psychoacousticss amplitude processing module 31.When amplitude frequency-domain analysiss module 310 determines that amplitude detection module 32 detects
When the magnitude of voltage of the audio signal after harmonic wave extraction process is more than protection limit value, the sound to feedback for the amplitude frequency-domain analysiss module 310
Frequency signal (that is, the audio signal after harmonic wave extraction process) is analyzed to determine the frequency band that energy is concentrated again, and band is hindered
The bandwidth of wave filter 320, the first band filter 330 and the second band filter group 350 is arranged to the frequency band in quantity set
Bandwidth, band elimination filter, the mid frequency of the first band filter are arranged to the mid frequency of energy collection midband, bandpass filtering
The mid frequency of device group arranges the frequency of second harmonic to energy collection midband and triple-frequency harmonics, so that band elimination filter 320
The frequency band that damping capacity is concentrated, the first band filter 330 allows the frequency band that energy is concentrated to pass through, the second band filter group
350 extract the second harmonic of frequency band and the triple-frequency harmonics that energy is concentrated, and blender 360 is superimposed the sound of band elimination filter 320 output
Frequency signal and the audio signal of the second band filter group 350 output, and export the audio signal after superposition, thus executing again
Harmonic wave extraction process.
After psychoacousticss amplitude processing module 31 executes harmonic wave extraction process again, amplitude detection module 32 can detect
The output voltage values of the audio signal after harmonic wave extraction process again.If the audio signal after harmonic wave extraction process is defeated again
Go out magnitude of voltage still above protection limit value, then psychoacousticss amplitude processing module 31 executable decay protection is processed.Therefore, according to
Embodiments of the invention, after execution two subharmonic extraction processs, if the output voltage of audio signal is still above protection
During limit value, then psychoacousticss amplitude processing module 31 execution decay protection is processed.However, alternatively, at psychoacousticss amplitude
Reason module 31 can not execute harmonic wave extraction process again, but directly execution decay protection is processed.That is, in execution once
After harmonic wave extraction process, if the output voltage of audio signal is still above protection limit value, psychoacousticss amplitude is processed
Module 31 can perform decay protection and processes.Further, optionally, after execution repeatedly (for example, three times) harmonic wave extraction process,
If the output voltage of audio signal is still above protection limit value, psychoacousticss amplitude processing module 31 just executes decay protection
Process.
After execution two subharmonic extraction processs, after amplitude detection module 32 detects harmonic wave extraction process again
When the output voltage values of audio signal are more than protection limit value, amplitude detection module 32 is according in psychoacousticss amplitude processing module 31
The magnitude of voltage of audio signal detecting before execution harmonic wave extraction process and protection limit value determine fading gain.Thereafter, exist
After amplitude frequency-domain analysiss module 310 receives the fading gain of amplitude detection module 32 determination, amplitude frequency-domain analysiss module 310
The gain of the first band filter 330 and the second band filter group 350 is set to infinitesimal, by band elimination filter 320
Gain is set to fading gain, and makes the audio signal Whole frequency band that audio mode filter 20 exports pass through band elimination filter 330,
Thus execute decay protection processing.Here, by make the first band filter 330 and the second band filter group 350 can be
The gain of the first band filter 330 and the second band filter group 350 is set to infinitesimal for 0 by number.
According to embodiments of the invention, the magnitude of voltage of the audio signal detecting when amplitude detection module 32 is less than protection limit
During value, psychoacousticss amplitude processing module 31 will execute signal and lead directly to process.That is, working as amplitude frequency-domain analysiss module 310
When determining that the magnitude of voltage of the audio signal that amplitude detection module 32 detects is less than protection limit value, amplitude frequency-domain analysiss module 310
The gain of the first band filter 330 and the second band filter group 350 is set to infinitesimal, by the gain of band elimination filter
It is set to 0dB, and make the audio signal Whole frequency band that audio mode filter 20 exports pass through band elimination filter, thus executing signal
Straight-through process.
Fig. 5 is the flow process illustrating the according to embodiments of the present invention method ensureing different audio patterns output loudness and tonequality
Figure.
With reference to Fig. 5, in step S401, the protection limit value of the output voltage of audio signal of setting input.In step
In S402, input audio signal is filtered to realize different audio patterns.In step S403, the audio frequency letter that detection receives
Number magnitude of voltage.In step s 404, the magnitude of voltage according to the audio signal detecting, the optionally audio frequency to described reception
Signal execution signal leads directly at least one of process, harmonic wave extraction process and decay protection process, so that the audio frequency after processing
The output voltage of signal is less than protection limit value.In step S405, the output voltage after processing is less than with the audio frequency of protection limit value
Signal carries out digital-to-analogue conversion, and exports simulated audio signal.Here, in step S403, the signal of described reception can be step
Audio signal after the process in step s 404 of filtered audio signal or feedback in rapid S402.Step S404 may include
Following steps lead directly to process, harmonic wave extraction process and decay protection process to execute signal：According to the audio signal detecting
Magnitude of voltage is analyzed to the audio signal of described reception to determine the frequency band that energy is concentrated；By described in attenuation of band-stop filter
The special frequency band of the audio signal receiving；The special frequency band being allowed the audio signal of described reception by the first band filter is led to
Cross；Produce the integral frequency harmonizing wave of the audio signal of the first band filter output；Extract first by the second low pass filter group
The second harmonic of audio signal of band filter output and triple-frequency harmonics；It is superimposed the sound of band elimination filter output by blender
Frequency signal and the audio signal of the second band filter group output, and export the audio signal after superposition.
In step s 404, when the magnitude of voltage of the audio signal detecting is more than protection limit value, to filtered audio frequency
Signal is analyzed to determine the frequency band that energy is concentrated, and by band elimination filter, the first band filter and the second bandpass filtering
The bandwidth of device group is arranged to the bandwidth of the frequency band in quantity set, band elimination filter, the mid frequency setting of the first band filter
To the mid frequency of energy collection midband, the mid frequency of band filter group arrange to energy collection midband second harmonic and
The frequency of triple-frequency harmonics, so that the frequency band that attenuation of band-stop filter energy is concentrated, the first band filter permission energy concentration
Frequency band passes through, and the second band filter group extracts the second harmonic of frequency band and the triple-frequency harmonics that energy is concentrated, and is superimposed bandreject filtering
The audio signal that the audio signal of device output is exported with the second band filter group, and export the audio signal after superposition, thus
Execution harmonic wave extraction process.Hereafter, the magnitude of voltage of the audio signal after harmonic wave extraction process detecting is more than protection limit value
When, the audio signal after the harmonic wave extraction process of feedback is analyzed to determine the frequency band that energy is concentrated again, and band is hindered
The bandwidth of wave filter, the first band filter and the second band filter group is arranged to the bandwidth of the frequency band in quantity set, band resistance
Wave filter, the mid frequency of the first band filter are arranged to the mid frequency of energy collection midband, in band filter group
Frequency of heart arranges the frequency of second harmonic to energy collection midband and triple-frequency harmonics, so that attenuation of band-stop filter energy is concentrated
Frequency band, first band filter allow energy concentrate frequency band pass through, second band filter group extract energy concentrate frequency
The second harmonic of band and triple-frequency harmonics, the audio signal that blender is superimposed band elimination filter output is defeated with the second band filter group
The audio signal going out, and export the audio signal after superposition, thus executing harmonic wave extraction process again.Hereafter, when detecting again
When the output voltage values of the audio signal after subharmonic extraction process are more than protection limit value, by the first band filter and the second band
The gain of bandpass filter group is set to infinitesimal, and the gain of band elimination filter is set to fading gain, and makes filtered sound
Frequency signal Whole frequency band pass through band elimination filter, thus execute decay protection process, wherein, according to execution harmonic wave extraction process it
Before the magnitude of voltage of audio signal that detects and protection limit value determining described fading gain.
On the other hand, in step s 404, when the magnitude of voltage of the audio signal detecting is less than protection limit value, by first
The gain of band filter and the second band filter group is set to infinitesimal, and the gain of band elimination filter is set to 0dB, and
Make filtered audio signal Whole frequency band pass through band elimination filter, process thus executing signal and leading directly to.
As described above, according to embodiments of the present invention ensureing that different audio patterns export setting of loudness and tonequality by applying
Standby and method, when the output voltage of audio signal exceeds protection limit value, output amplitude will be limited within protection limit value；With
When, being processed by psychoacousticss amplitude to make output loudness suitable with during non-limited amplitude, thus ensureing under noise circumstance preferably
Listen to signal to noise ratio and tonequality.
Although some embodiments have been shown and described, it will be appreciated by those skilled in the art that without departing from this
In the case of the principle of invention and spirit, these embodiments can be modified, the scope of the present invention by claim and its
Equivalent limits.
Claims (15)
1. a kind of equipment ensureing that different audio pattern exports loudness and tonequality, including：
Gain arranging unit, for the protection limit value of the output voltage of the audio signal of setting input；
Audio mode filter, for being filtered to the audio signal inputting to realize different audio patterns；
Amplitude real-time processing module, for receiving the audio signal of audio mode filter output or the audio frequency letter of itself feedback
Number, and the audio signal receiving is processed so that the output voltage of audio signal after being processed is less than and protects limit value；
Digital to analog converter, the audio signal for the output voltage after processing is less than with protection limit value carries out digital-to-analogue conversion, and defeated
Go out simulated audio signal,
Wherein, amplitude real-time processing module includes：
Amplitude detection module, for detecting the magnitude of voltage of the audio signal of described reception；
Psychoacousticss amplitude processing module, for the magnitude of voltage according to the audio signal detecting, optionally to described reception
Audio signal execution signal lead directly to process, harmonic wave extraction process and decay protection process at least one of so that process after
Audio signal output voltage be less than protection limit value,
Wherein, psychoacousticss amplitude processing module includes：
Amplitude frequency-domain analysiss module, the magnitude of voltage of the audio signal being detected according to the amplitude detection module audio frequency to described reception
Signal is analyzed to determine the frequency band that energy is concentrated；
Band elimination filter, the special frequency band of the audio signal of the described reception that decays；
First band filter is it is allowed to the special frequency band of the audio signal of described reception passes through；
Predistortion module, for producing the integral frequency harmonizing wave of the audio signal of the first band filter output；
Second band filter group, second harmonic and three times for extracting the audio signal that the first band filter exports are humorous
Ripple；
Blender, for being superimposed the audio signal of band elimination filter output and the audio signal of the second band filter group output,
And export the audio signal after superposition.
2. equipment according to claim 1, wherein, the second band filter group is included for extracting the first band filter
Second band filter of the second harmonic of audio signal of output and the audio frequency letter for extracting the first band filter output
Number triple-frequency harmonics the 3rd band filter.
3. equipment according to claim 1, wherein, when amplitude frequency-domain analysiss module determines what amplitude detection module detected
When the magnitude of voltage of audio signal is more than protection limit value, the audio signal that amplitude frequency-domain analysiss module exports to audio mode filter
It is analyzed to determine the frequency band that energy is concentrated, by band elimination filter, the first band filter and the second band filter group
Bandwidth is arranged to the bandwidth of the frequency band in quantity set, so that the frequency band that attenuation of band-stop filter energy is concentrated, the first bandpass filtering
Device allow energy concentrate frequency band pass through, second band filter group extract energy concentrate the second harmonic of frequency band and three times humorous
Ripple, blender is superimposed the audio signal of band elimination filter output and the audio signal of the second band filter group output, and exports
Audio signal after superposition, thus psychoacousticss amplitude processing module execution harmonic wave extraction process.
4. equipment according to claim 3, wherein, psychoacousticss amplitude processing module execution harmonic wave extraction process it
Afterwards, output voltage values of audio signal after amplitude detection module detects harmonic wave extraction process by the sound after harmonic wave extraction process
Frequency signal feeds back to psychoacousticss amplitude processing module.
5. equipment according to claim 4, wherein, when amplitude frequency-domain analysiss module determines what amplitude detection module detected
When the magnitude of voltage of the audio signal after harmonic wave extraction process is more than protection limit value, amplitude frequency-domain analysiss module carries to the harmonic wave of feedback
Take the audio signal after process to be analyzed to determine the frequency band that energy is concentrated again, and band elimination filter, the first band logical are filtered
The bandwidth of ripple device and the second band filter group is arranged to the bandwidth of the frequency band in quantity set, so that attenuation of band-stop filter energy
The frequency band concentrated, the first band filter allows the frequency band that energy is concentrated to pass through, and the second band filter group is extracted energy and concentrated
The second harmonic of frequency band and triple-frequency harmonics, blender is superimposed audio signal and second band filter of band elimination filter output
The audio signal of group output, and export the audio signal after superposition, thus psychoacousticss amplitude processing module executes harmonic wave again
Extraction process.
6. equipment according to claim 5, wherein, executes harmonic wave extraction process again in psychoacousticss amplitude processing module
Afterwards, the output voltage values of the amplitude detection module detection audio signal after harmonic wave extraction process again.
7. equipment according to claim 6, wherein, sound after amplitude detection module detects harmonic wave extraction process again
When the output voltage values of frequency signal are more than protection limit value, amplitude detection module is humorous according to executing in psychoacousticss amplitude processing module
The magnitude of voltage of the audio signal detecting before ripple extraction process and protection limit value determine fading gain.
8. described equipment according to claim 7, wherein, when amplitude frequency-domain analysiss module receives amplitude detection module
During the fading gain determining, the gain of the first band filter and the second band filter group is arranged by amplitude frequency-domain analysiss module
For infinitesimal, the gain of band elimination filter is set to fading gain, and makes the audio signal that audio mode filter exports complete
Frequency band passes through band elimination filter, thus the execution decay protection of psychoacousticss amplitude processing module is processed.
9. equipment according to claim 1, wherein, when amplitude frequency-domain analysiss module determines what amplitude detection module detected
When the magnitude of voltage of audio signal is less than protection limit value, amplitude frequency-domain analysiss module is by the first band filter and the second bandpass filtering
The gain of device group is set to infinitesimal, the gain of band elimination filter is set to 0dB, and makes the sound of audio mode filter output
Frequency signal Whole frequency band passes through band elimination filter, thus psychoacousticss amplitude processing module execution signal leads directly to and processes.
10. a kind of method ensureing that different audio patterns export loudness and tonequality, including：
The protection limit value of the output voltage of audio signal of (a) setting input；
B () is filtered to input audio signal to realize different audio patterns；
C () is processed to the audio signal receiving, so that the output voltage of the audio signal after processing is less than protection limit value；
D audio signal that () is less than protection limit value to the output voltage after processing carries out digital-to-analogue conversion, and exports analogue audio frequency letter
Number,
Wherein, the audio signal after process is fed back, thus the audio signal receiving described in step (c) is filtered audio frequency
Audio signal after the process of signal or feedback,
Wherein, step (c) includes：
Detect the magnitude of voltage of the audio signal of described reception；
According to the magnitude of voltage of the audio signal detecting, optionally place is led directly to the audio signal execution signal of described reception
At least one of reason, harmonic wave extraction process and decay protection process, so that the output voltage of the audio signal after processing is less than
Protection limit value,
Wherein, step (c) also includes：
Magnitude of voltage according to the audio signal detecting is analyzed to the audio signal of described reception to determine what energy was concentrated
Frequency band；
The special frequency band of the audio signal by receiving described in attenuation of band-stop filter；
The special frequency band being allowed the audio signal of described reception by the first band filter is passed through；
Produce the integral frequency harmonizing wave of the audio signal of the first band filter output；
Extract second harmonic and the triple-frequency harmonics of the audio signal of the first band filter output by the second low pass filter group；
It is superimposed the audio signal of band elimination filter output and the audio signal of the second band filter group output by blender, and
Audio signal after output superposition.
11. methods according to claim 10, wherein, the second band filter group is included for extracting the first bandpass filtering
Second band filter of the second harmonic of audio signal of device output and the audio frequency for extracting the first band filter output
3rd band filter of the triple-frequency harmonics of signal.
12. methods according to claim 10, wherein, in step (c), when the magnitude of voltage of the audio signal detecting is big
When protecting limit value, filtered audio signal is analyzed to determine the frequency band that energy is concentrated, and by band elimination filter, the
The bandwidth of one band filter and the second band filter group is arranged to the bandwidth of the frequency band in quantity set, so that band elimination filter
The frequency band that damping capacity is concentrated, the first band filter allows the frequency band that energy is concentrated to pass through, and the second band filter group is extracted
The second harmonic of frequency band and triple-frequency harmonics that energy is concentrated, the audio signal of superposition band elimination filter output and the second bandpass filtering
The audio signal of device group output, and export the audio signal after superposition, thus executing harmonic wave extraction process.
13. methods according to claim 12, the sound wherein, in step (c), after the harmonic wave extraction process detecting
When the magnitude of voltage of frequency signal is more than protection limit value, the audio signal after the harmonic wave extraction process of feedback is analyzed with true again
The surely frequency band in quantity set, and the bandwidth of band elimination filter, the first band filter and the second band filter group is set to
The bandwidth of the frequency band that energy is concentrated, so that the frequency band that attenuation of band-stop filter energy is concentrated, the first band filter permission energy
The frequency band concentrated passes through, and the second band filter group extracts the second harmonic of frequency band and the triple-frequency harmonics that energy is concentrated, blender
The audio signal that the audio signal of superposition band elimination filter output is exported with the second band filter group, and export the sound after superposition
Frequency signal, thus execute harmonic wave extraction process again.
14. methods according to claim 13, wherein, in step (c), after harmonic wave extraction process again is detected
When the output voltage values of audio signal are more than protection limit value, the gain of the first band filter and the second band filter group is set
It is set to infinitesimal, the gain of band elimination filter is set to fading gain, and make filtered audio signal Whole frequency band pass through band
Resistance wave filter, thus execute decay protection processing, wherein, according to the audio signal detecting before execution harmonic wave extraction process
Magnitude of voltage and protection limit value determining described fading gain.
15. methods according to claim 10, wherein, in step (c), when the magnitude of voltage of the audio signal detecting is little
When protecting limit value, the gain of the first band filter and the second band filter group is set to infinitesimal, by bandreject filtering
The gain of device is set to 0dB, and makes filtered audio signal Whole frequency band pass through band elimination filter, thus executing signal to lead directly to place
Reason.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210424656.7A CN103796136B (en) | 2012-10-30 | 2012-10-30 | Equipment and method for ensuring output loudness and tone quality of different sound effect modes |
| KR1020130047357A KR20140055932A (en) | 2012-10-30 | 2013-04-29 | Apparatus and method for keeping output loudness and quality of sound among differernt equalizer modes |
| US14/067,692 US9386374B2 (en) | 2012-10-30 | 2013-10-30 | Apparatus and method for keeping output loudness and quality of sound among different equalizer modes |
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| CN105246015A (en) * | 2015-11-11 | 2016-01-13 | 上海斐讯数据通信技术有限公司 | Electronic device and method and system for detecting loudspeaker sound source thereof |
| CN106331257B (en) * | 2016-08-19 | 2019-07-02 | 青岛海信移动通信技术股份有限公司 | A kind of method of canceling noise, device and communication equipment |
| CN106569780B (en) * | 2016-11-04 | 2021-12-07 | 北京飞利信电子技术有限公司 | Real-time sound effect processing method and system for multi-channel digital audio signal |
| CN110913312B (en) * | 2018-09-17 | 2021-06-18 | 海信集团有限公司 | Echo cancellation method and device |
| CN109872710B (en) * | 2019-03-13 | 2021-01-08 | 腾讯音乐娱乐科技（深圳）有限公司 | Sound effect modulation method, device and storage medium |
| CN110264985A (en) * | 2019-06-06 | 2019-09-20 | 得理乐器(珠海)有限公司 | A kind of dynamic acoustic processing system and method |
| CN112532208B (en) * | 2019-09-18 | 2024-04-05 | 惠州迪芬尼声学科技股份有限公司 | Harmonic generator and method for generating harmonics |
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| CN101048935A (en) * | 2004-10-26 | 2007-10-03 | 杜比实验室特许公司 | Calculating and adjusting the perceived loudness and/or the perceived spectral balance of an audio signal |
| CN101512898A (en) * | 2006-08-31 | 2009-08-19 | 索尼爱立信移动通讯有限公司 | Volume control circuits for use in electronic devices and related methods and electronic devices |
| CN101855901A (en) * | 2007-08-16 | 2010-10-06 | Dts（英属维尔京群岛）有限公司 | Audio processing for compressed digital television |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101048935A (en) * | 2004-10-26 | 2007-10-03 | 杜比实验室特许公司 | Calculating and adjusting the perceived loudness and/or the perceived spectral balance of an audio signal |
| CN101512898A (en) * | 2006-08-31 | 2009-08-19 | 索尼爱立信移动通讯有限公司 | Volume control circuits for use in electronic devices and related methods and electronic devices |
| CN101855901A (en) * | 2007-08-16 | 2010-10-06 | Dts（英属维尔京群岛）有限公司 | Audio processing for compressed digital television |
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| CN103796136A (en) | 2014-05-14 |
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