CN108366331A - Apparatus for processing audio and audio-frequency processing method - Google Patents
Apparatus for processing audio and audio-frequency processing method Download PDFInfo
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- CN108366331A CN108366331A CN201710059978.9A CN201710059978A CN108366331A CN 108366331 A CN108366331 A CN 108366331A CN 201710059978 A CN201710059978 A CN 201710059978A CN 108366331 A CN108366331 A CN 108366331A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
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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
- G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
Abstract
A kind of apparatus for processing audio of the application offer and audio-frequency processing method, wherein apparatus for processing audio includes reversed noise filter, output circuit and equalizer.Reversed noise filter eliminates signal to handle digital signal, to generate noise.Output circuit eliminates signal and equating signal generation mixed frequency signal to mix noise, and generates sound output signal based on mixed frequency signal, and wherein digital signal is associated with sound output signal.Equalizer adjusts at least parameter in equalizer to receive input signal according to equating signal and digital signal, to handle the input signal as equating signal.
Description
Technical field
This disclosure relates to a kind of apparatus for processing audio, and the apparatus for processing audio more particularly to test earphone state with
Method.
Background technology
In order to provide higher sound quality, it is commonly incorporated into active noise on earphone and eliminates mechanism to reduce environmental noise
Influence.In some technologies, active noise is eliminated mechanism and is realized by feedback formula circuit.It is defeated from loud speaker in these technologies
After going out sound audio signals, this sound audio signals can be received by internal microphone and is fed back in device sound mixing.To avoid original sound
Frequency is influenced by the sound audio signals that feedback is returned, and needs that eqalizing cricuit offer compensation is added.
In general, feedback return music signal can by external factor (such as：Earphone position, user's ear shape
Shape) change.However, in existing technology, eqalizing cricuit is only capable of providing fixed transfer function mostly to compensate.Such one
Come, when the music signal that feedback is returned changes, eqalizing cricuit can not provide corresponding sound effect.
Invention content
To solve the above problems, in some embodiments, apparatus for processing audio includes reversed noise filter, output circuit
And eqalizing cricuit circuit.Reversed noise filter eliminates signal to handle digital signal, to generate noise.Output circuit to
It mixes noise and eliminates signal and equating signal generation mixed frequency signal, and sound output signal is generated based on mixed frequency signal, wherein
Digital signal is associated with sound output signal.Eqalizing cricuit circuit to receive an input signal, and to according to equating signal with
And at least parameter in digital signal adjustment eqalizing cricuit circuit, to handle input signal into equating signal.
In some embodiments, the audio-frequency processing method of the disclosure includes following operation：Processing digital signal is made an uproar with generating
Sound eliminates signal；Mixing noise eliminates signal and equating signal to generate mixed frequency signal, and exports sound based on mixed frequency signal
Output signal, wherein digital signal are associated with the sound output signal；And according to equating signal and digital signal adjust to
A few parameter, to handle input signal into equating signal.
In conclusion the apparatus for processing audio that the disclosure provides can detect earphone position from method or different ears construct,
To dynamically adjust the parameter of eqalizing cricuit, to keep the sound effect of final output.
Description of the drawings
For above and other purpose, feature, advantage and the embodiment of the disclosure can be clearer and more comprehensible, book is illustrated
It is described as follows：
Fig. 1 is a kind of schematic diagram of apparatus for processing audio shown by some embodiments of the present disclosure；
Fig. 2A is the method as performed by control circuit in Fig. 1 according to some embodiments of the present disclosure
Flow chart；
Fig. 2 B are the functional block diagram of the method for executing Fig. 2A shown by some embodiments of the present disclosure；
Fig. 3 is a kind of schematic diagram of apparatus for processing audio shown by some embodiments of the present disclosure；And
Fig. 4 is a kind of flow chart of audio-frequency processing method shown by some embodiments of the present disclosure.
Reference sign：
100、300：Apparatus for processing audio 110：Analog-to-digital converter
120：Reversed noise filter 130：Output circuit
140：Eqalizing cricuit circuit 150：Acoustic-electric conversion equipment
V(t)：Make an uproar audio signal SO (t)：Sound output signal
Y(n)：Digital signal E (t)：Electronic signal
Sinv(z)、D(z)：Transfer function H (z), S (z)：Transfer function
NC(n)：Noise eliminates signal 132：Computing circuit
134：Digital to analog converter 136：Electro-acoustic conversion device
141：Eqalizing cricuit 142：Adaptive filter
143：Reversed noise filter 144：Computing circuit
142A：Filter circuit 142B：Control circuit
M(n)：Music signal U (n)：Mixed frequency signal
a(n)：Equating signal F1 (n), F2 (n)：Filtering signal
EO(n)：Deng change output signal S210~S240：Operation
200、400：Method 210A, 220A：Unit
S410~S430：Operate 230A, 240A：Unit
Specific implementation mode
It is hereafter for the embodiment cooperation Figure of description embodiment that elaborates, but provided not limiting this
Open covered range, and the description of structure operation is non-to limit the sequence of its execution, it is any to be reconfigured by element
Structure, the produced device with impartial technique effect, is all the range that the disclosure is covered.In addition, attached drawing is only with explanation
Purpose, and map not according to full size.To make to be easy to understand, in following the description similar elements will be with identical symbology for
It is bright.
About " first " used herein, " second " ... etc., not especially censure the meaning of order or cis-position, also
The non-element described with same technique term just for the sake of difference limiting the disclosure or operation.In addition, about
" coupling " or " connection " used herein, can refer to two or multiple element mutually directly make entity or in electrical contact, or
It mutually puts into effect indirectly body or in electrical contact, is also referred to as two or multiple element mutual operation or action.
Fig. 1 is a kind of schematic diagram of apparatus for processing audio 100 shown by some embodiments of the present disclosure.Yu Yi
In a little embodiments, apparatus for processing audio 100 can be placed on earphone.In some embodiments, apparatus for processing audio 100 has master
The dynamic mechanism for eliminating noise, to reduce the interference of environmental noise.
In some embodiments, apparatus for processing audio 100 includes analog-to-digital converter 110, reversed noise filter
120, output circuit 130, eqalizing cricuit circuit 140 and acoustic-electric conversion equipment 150.
In some embodiments, acoustic-electric conversion equipment 150 is set in the shell of earphone, and to receive sound output letter
Number SO (t) and the audio signal V (t) that makes an uproar.Acoustic-electric conversion equipment 150 converts the sound audio signals that receive to electronic signal E
(t).In some embodiments, acoustic-electric conversion equipment 150 can be realized by microphone, but the disclosure is not limited thereto.
Analog-to-digital converter 110 is to conversion electron signal E (t) to digital signal Y (n).Reversed noise filter
120 are coupled to analog-to-digital converter 110, to receive digital signal Y (n).
Reversed noise filter 120 eliminates signal NC (n) to handle digital signal Y (n), to generate noise.In some
In embodiment, noise eliminates signal NC (n) to reduce the influence of environmental noise (such as the audio signal V (t) that makes an uproar).In some realities
It applies in example, reversed noise filter 120 can be an adaptive filter.
Output circuit 130 includes computing circuit 132, digital to analog converter 134 and electro-acoustic conversion device 136.Fortune
Calculate circuit 132 receive noise eliminate signal NC (n), and to mix noise eliminate signal NC (n) and equating signal a (n) with
Generate mixed frequency signal U (n).In some embodiments, computing circuit 132 can be realized by circuits such as adder and/or synthesizers.Number
Word to analog converter 134 is coupled to computing circuit 132, and to conversion mixes signal U (n).Electro-acoustic conversion device 136 couples
It is sound to digital to analog converter 134, and to export mixed frequency signal U (n) through 134 transformed signal of analog converter
Sound output signal SO (t).In some embodiments, electro-acoustic conversion device 136 can be realized by loud speaker.
In some embodiments, eqalizing cricuit circuit 140 to signal components of the input signal M (n) in each frequency range into
Row adjustment, to generate different sound effects.In some embodiments, eqalizing cricuit circuit 140 to according to equating signal a (n),
An at least parameter in mixed frequency signal U (n) and digital signal Y (n) adjustment eqalizing cricuits circuit 140, to determine equating signal a
(n)。
In the example in fig 1, eqalizing cricuit circuit 140 include eqalizing cricuit 141, it is adaptability (adaptive) filter 142, anti-
To noise filter 143 and computing circuit 144.Eqalizing cricuit 141 is believed to handle input signal M (n) with the changes such as generation output
Number EO (n).In some embodiments, input signal M (n) can interrogate the sound audio signals that source provides by music.
Adaptive filter 142 to according to mixed frequency signal U (n), digital signal Y (n) and wait than signal a (n) processing
Deng change output signal EO (n).In some embodiments, adaptive filter 142 includes filter circuit 142A and control electricity
Road 142B.Filter circuit 142A changes output signal EO (n) to provide transfer function Sinv (z) to handle etc., to generate filter
Wave signal F1 (n).Control circuit 142B is to the foundation error signal e when the power of equating signal a (n) is more than predetermined value THD
(n) a (not shown) adjustment at least weight coefficient (w as be described hereinafterk), to update transfer function Sinv (z) above-mentioned.Herein
The paragraph that will be described later is operated in detail with reference to Fig. 2A together to illustrate.In each embodiment, adapting to device filter 142 can be by various number
The realization of word circuit, such as comprising finite impulse response filter etc., but the disclosure is not limited thereto.
In some embodiments, reversed noise filter 143 changes output signal EO (n) to handle etc., to generate filtering
Signal F2 (n).Computing circuit 144 is coupled to eqalizing cricuit circuit 140 and reversed noise filter 143, to accept filter respectively
Signal F1 (n) and filtering signal F2 (n).In some embodiments, computing circuit 144 from filtering signal F1 (n) subtracting
Filtering signal F2 (n), to generate equating signal a (n) above-mentioned.
In some embodiments, under conditions of without eqalizing cricuit circuit 140, input signal M (n) is directly inputted into
Computing circuit 132 and generate mixed frequency signal U (n).With this condition, it using Z transformational analyses apparatus for processing audio 100, can obtain
Following formula (1)：
Wherein, the Z that M (z) is input signal M (n) converts (Z-transform), and the Z that Y (z) is digital signal Y (n) turns
It changes, H (z) is the transfer function of reversed noise filter 120, and V (z) is the corresponding digital signal V (n) of audio signal V (t) of making an uproar
Z is converted, and S (z) is electro-acoustic conversion device 136 to the equivalent transfer function between acoustic-electric conversion equipment 150.According to above formula (1),
Can be derived from input signal M (n) to the transfer function between analog-to-digital converter 110 be S (z)/[1-S (z) H (z)].
Therefore, in the embodiment with eqalizing cricuit circuit 140, the transfer function E (z) of eqalizing cricuit circuit 140 can be indicated
For following formula (2)：
Wherein, D (z) is the transfer function of eqalizing cricuit 141, and also as input signal M (n) is output to the target after human ear
Transfer function.In some embodiments, transfer function D (z) and transfer function H (z) is that preset can understand numerical value, and turn
Moving function S (z) can change because of the position of earphone or different ear shapes.In some embodiments, the eqalizing cricuit electricity in Fig. 1
Road 140 can be designed according to above formula (2).
In some technologies, apparatus for processing audio adjusts input letter only with the eqalizing cricuit with fixed transfer function
Number M (n).In these technologies, eqalizing cricuit is not adjusted according to the variation dynamic of transfer function S (z), and makes the tune of eqalizing cricuit
Result of broadcast after whole reduces.It can be according to mixed frequency signal U (n) by the way that adaptive filter 142 is arranged compared to above-mentioned technology
And/or equating signal A (n) estimates transfer function S (z), and then dynamically adjust adaptation according to the transfer function S (z) estimated
The parameter of property filter 142.Thus, which apparatus for processing audio 100 can come according to the position of earphone or different ears construction
Dynamically adjust the sound effect of final output.
Fig. 2A is the side as performed by control circuit 142B in Fig. 1 according to some embodiments of the present disclosure
The flow chart of method 200.
In some embodiments, control circuit 142B can be by any hardware of execution method 200, software or combinations of the above
It realizes.In some embodiments, above-mentioned hardware includes processor, microcontroller, special application integrated circuit or various types
Digital signal processing circuit.
As shown in Figure 2 A, in operating in S210, via the adaptive filter processing mixing letter with transfer function W (z)
Number U (n), to estimate transfer function S (z).In some embodiments, adaptive filter can be realized by FIR filter, and be shifted
Function W (z) can indicate W (z)=w0+w1 z-1+w2 z-2+…+wL-1z-L+1。
In operating in S220, will be subtracted with the output of the adaptive filter of transfer function W (z) digital signal Y (n) with
Generate error signal e (n).
In operating in S230, adaptability algorithm is executed, with when the power of equating signal a (n) is more than a predetermined value THD
Update at least weight coefficient w in transfer function W (z)k。
For example, referring to Fig. 1 following formula (3) can be obtained to utilizing Z transformational analyses apparatus for processing audio 100：
Wherein, the Z that A (z) is equating signal a (n) is converted.Know as available from the above equation, when the power of equating signal a (n) is more than
Make an uproar audio signal V (t) power when, it can be seen that following formula (4)：
With this condition, the ratio of Y (z) and U (z) is S (z).In other words, when the power of equating signal a (n) is more than noise
When the power of the corresponding digital signal V (n) of frequency signal V (t), transfer function W (z) can converge to transfer function S (z).Conversely, working as
When the power of equating signal a (n) is the power of digital signal V (n) corresponding less than the audio signal V (t) that makes an uproar, transfer function W (z)
It is only capable of converging to 1/H (z).
Accordingly, it is based on above-mentioned relation, can be by the way that predetermined value THD be arranged, whether the power to judge equating signal a (n) is sufficient
The enough power for being more than the corresponding digital signal V (n) of audio signal V (t) of making an uproar.In some embodiments, the adaptation in operation 230
Property algorithm is represented by following formula：
if a[n]2＞ THD:wk=wk+ μ e (n) × U (n-k), k=0~L-1；
else:wk=wk
Wherein, error signal e (n) is to be generated based on mixed frequency signal U (n) and digital signal Y (n), for example, error signal
E (n) is the difference between the output and digital signal Y (n) of the adaptive filter with transfer function W (z), wkIt is above-mentioned turn
Move multiple weight coefficients in function W (z), a [n]2It is expressed as the power of equating signal a (n), and μ is step spacing (step-
size)。
With continued reference to Fig. 2A, in operating in S240, fast Fourier transform, fortune reciprocal are sequentially executed to transfer function W (z)
Calculation and reverse fast Fourier transform, to adjust the transfer function Sinv (z) of filter circuit 142A, wherein transfer function
Sinv (z) is associated with the inverse for transfer function S (z).For example, in an embodiment, transfer function Sinv (z) can substantially be set
It is set to the inverse of transfer function S (z).
By operating multiple operations in S240,1/S (z) (the i.e. transfer function Sinv in previously described formula (2) can be estimated
(z)).For equivalent, equalizer 140 can perform the operation of formula (2) to handle input signal M (n), with according to transfer function
S (z) dynamically adjusts sound output effect.
Fig. 2 B are the function block of the method 200 for executing Fig. 2A shown by some embodiments of the present disclosure
Figure.In some embodiments, adaptive filter 142 can be implemented by multiple functional units of Fig. 2 B.
For example, unit 210A can be used for executing multiple operation S210, S220 and S230 of earlier figures 2A.Unit 220A can
The operation (being expressed as FFT) of fast Fourier transform in multiple operation S240 for executing earlier figures 2A.Unit 230A can be used
Derivative action (being expressed as (1/*)) in the multiple operation S250 for executing earlier figures 2A.Unit 240A can be used for executing aforementioned
Reverse fast Fourier transform operation (being expressed as IFFT) in multiple operation S250 of Fig. 2A.The functional block diagram of Fig. 2 B is only
Example, the disclosure are not limited thereto.
Fig. 3 is a kind of schematic diagram of apparatus for processing audio 300 shown by some embodiments of the present disclosure.It is easy
Similar component in understanding, Fig. 1 and Fig. 3 will be designated as same reference numerals.
Compared to Fig. 1, the control circuit 142B in apparatus for processing audio 300 believes according only to equating signal a (n) and number
An at least weight coefficient w in number Y (n) adjustment transfer function W (z)k.For example, the control circuit 142B compared to Fig. 1, this example
In control circuit 142B be arranged in operating S210 with via with transfer function W (z) adaptive filter processing etc. changes
Signal a (n), to estimate transfer function S (z).In this example, error signal e (n) is based on equating signal a (n) and number letter
Number Y (n) is generated.For example, error signal e (n) is output and the digital signal Y of the adaptive filtering with transfer function W (z)
(n) difference between.In other words, in this example, the unit 210A in Fig. 2 B above-mentioned can not received under mixed frequency signal U (n)
Estimate transfer function S (z).
For example, according to previous formula (3), when the power of equating signal a (n) is more than the number made an uproar corresponding to audio signal V (t)
When the power of signal V (n), it can be seen that following formula (4)：
Therefore, under the conditions of this, Y (z)/A (z)=S (z)/[1-S (z) H (z)].Thus, transfer function W (z) meetings
S (z)/[1-S (z) H (z)] is converged to, and transfer function Sinv (z) can converge to 1/S (z)-H (z).Therefore, work as transfer function
When 1/S (z) is sufficiently more than transfer function H (z), transfer function Sinv (z) may approximately equal to 1/S (z).Alternatively, working as transfer function 1/S
(z) when being less than transfer function H (z), by analysis it can be seen that the error amount only about 6dB of transfer function Sinv (z).Accordingly, not
Under the conditions of various, the control circuit 142B in this is still enough to estimate out transfer function Sinv (z).
In above-mentioned each embodiment, apparatus for processing audio 100 can be by each with each circuit in apparatus for processing audio 300
The digital signal processing circuit of type is realized.Alternatively, multiple operations in the various embodiments described above can be arranged by state machine, and pass through
It is realized by hardware, software, or its combination.It is various implement it is more in above-mentioned apparatus for processing audio 100 and apparatus for processing audio 300
The embodiment of a element and its function is all the range that the disclosure is covered.
Fig. 4 is a kind of flow chart of audio-frequency processing method 400 shown by some embodiments of the present disclosure.In behaviour
Make S410, processing digital signal Y (n), signal NC (n) is eliminated to generate noise.
For example, as shown in Figure 1, reversed noise filter 120 eliminates letter to handle digital signal Y (n) to generate noise
Number NC (n), wherein digital signal Y (n) are to be generated via 110 conversion electron signal E (t) of analog-to-digital converter.
In operation S420, mixing noise eliminates signal NC (n), equating signal a (n) and generates mixed frequency signal U (n), and is based on
Mixed frequency signal U (n) exports sound output signal SO (t).For example, as it was earlier mentioned, operation S420 can be by the output circuit of Fig. 1
130 execute.
In operation S430, an at least parameter is adjusted according to equating signal a (n) and digital signal Y (n), with changes such as decisions
Signal a (n).For example, as it was earlier mentioned, method 200 can be executed by the control circuit 142B of Fig. 1 or Fig. 3, with adjustment at least one
Weight parameter wk, wherein weight parameter wkIt is associated with the transfer function Sinv (z) of filter circuit 142A.Thus, which grade is believed
Number a (n) can be dynamically changed according to the position or different ear constructions of earphone, to keep the sound effect of final output.
Multiple steps of the above method 400 are merely illustrative, and the sequence for being not limited to above-mentioned example executes.Without prejudice to this public affairs
Under the mode of operation and range of each embodiment for opening content, various operations under method 400 when can suitably increase, replace,
It omits or is executed with different order.
In conclusion the apparatus for processing audio that the disclosure provides can detect earphone position from method or different ears construct,
To dynamically adjust the parameter of balanced device, to keep the sound effect of final output.
Although the disclosure is disclosed as above with embodiment, so itself and the non-limiting disclosure, any those skilled in the art,
It is not departing from spirit and scope of the present disclosure, when that can make various variations and retouching, therefore the protection domain of the disclosure is after regarding
Subject to attached as defined in claim.
Claims (10)
1. a kind of apparatus for processing audio, including：
One first reversed noise filter eliminates signal to handle a digital signal to generate a noise；
One output circuit eliminates signal and first signal one mixed frequency signal of generation to mix the noise, and mixed based on this
Frequency signal generates a sound output signal, and the wherein digital signal is associated with the sound output signal；And
First device circuit, to receive an input signal, and to be somebody's turn to do according to the equating signal and digital signal adjustment
An at least parameter in eqalizing cricuit circuit, to handle the input signal into suchization signal.
2. apparatus for processing audio as described in claim 1, the wherein output circuit include：
One computing circuit eliminates signal with the equating signal to generate the mixed frequency signal to mix the noise；
One digital to analog converter, to convert the mixed frequency signal；And
One electro-acoustic conversion device, to export the sound output signal according to the transformed mixed frequency signal.
3. apparatus for processing audio as claimed in claim 2, also includes：
One acoustic-electric conversion equipment generates an electronic signal to be based on make an uproar audio signal and the sound output signal；And
One analog-to-digital converter, to convert the electronic signal to the digital signal.
4. being deposited between apparatus for processing audio as claimed in claim 3, the wherein electro-acoustic conversion device and the acoustic-electric conversion equipment
In one first transfer function, which includes an adaptive filter, which has one second transfer
Function, an at least parameter are to be associated with an at least weight coefficient for second transfer function, and second transfer function is associated with
In the inverse for first transfer function.
5. apparatus for processing audio as described in claim 1, wherein the eqalizing cricuit circuit include an adaptive filter, and this is extremely
A few parameter is an at least weight coefficient for the adaptive filter.
6. apparatus for processing audio as described in claim 1, wherein the eqalizing cricuit circuit include：
First device, to handle the input signal to generate first output signal；
One adaptive filter, to be exported according to the mixed frequency signal, the equating signal and Digital Signal Processing suchization
Signal, to generate one first filtering signal；
One second reversed noise filter, to handle suchization output signal, to generate one second filtering signal；And
One computing circuit, to subtract second filtering signal from first filtering signal, to generate suchization signal.
7. apparatus for processing audio as claimed in claim 6, the wherein adaptive filter include：
One filter circuit handles suchization output signal, to generate first filtering signal to provide a transfer function；With
And
One control circuit, to adjust this at least according to an error signal when a power of the equating signal is more than a predetermined value
One parameter, to update the transfer function,
Wherein the error signal is to be generated based on the mixed frequency signal and the digital signal, and an at least parameter is to be associated with this
An at least weight coefficient for transfer function.
8. apparatus for processing audio as described in claim 1, wherein the eqalizing cricuit circuit include：
First device, to handle the input signal to generate first output signal；
One adaptive filter, to according to the equating signal and the Digital Signal Processing suchization output signal, to generate
One first filtering signal；
One second reversed noise filter, to handle suchization output signal, to generate one second filtering signal；And
One computing circuit, to subtract second filtering signal from first filtering signal, to generate the equating signal.
9. apparatus for processing audio as claimed in claim 8, the wherein adaptive filter include：
One filter circuit handles suchization output signal, to generate first filtering signal to provide a transfer function；With
And
One control circuit, to adjust this at least according to an error signal when a power of the equating signal is more than a predetermined value
One parameter, to update the transfer function,
Wherein the error signal is to be generated based on the equating signal and the digital signal, and an at least parameter is to be associated with this
An at least weight coefficient for transfer function.
10. a kind of audio-frequency processing method, including：
It handles a digital signal and eliminates signal to generate a noise；
It mixes the noise and eliminates signal and first signal to generate a mixed frequency signal, and a sound is exported based on the mixed frequency signal
Sound output signal, the wherein digital signal are associated with the sound output signal；And
An at least parameter is adjusted according to the equating signal and the digital signal, to handle an input signal into the equating signal.
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