CN107920320A - Hearing aid and its automatic frequency-division filter gain control method - Google Patents
Hearing aid and its automatic frequency-division filter gain control method Download PDFInfo
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- CN107920320A CN107920320A CN201610887232.2A CN201610887232A CN107920320A CN 107920320 A CN107920320 A CN 107920320A CN 201610887232 A CN201610887232 A CN 201610887232A CN 107920320 A CN107920320 A CN 107920320A
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- frequency
- bandpass filter
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- gain
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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
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/03—Synergistic effects of band splitting and sub-band processing
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Neurosurgery (AREA)
- Otolaryngology (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
The present invention provides a kind of hearing aid, including：One audio input end, an input digital signal is converted to for receiving an input audio signal, and by the input audio signal；One audio frequency processing circuit, for producing an output digit signals to the input electrical signals one automatic frequency-division filter gain control method of execution；And an audio output, for the output digit signals to be converted to an exports audio signal and are played out, wherein the automatic frequency-division filter gain control method includes：Take the hearing attenuation curve of a user；Calculate the sound attenuation curve multiple adaptation frequency gains accordingly；A segmentation bandpass filter is applied mechanically an input audio signal, and the wherein segmentation bandpass filter includes multiple bandpass filters for different frequency bands；Calculate the corresponding adaptation frequency relation matrix of the segmentation bandpass filter institute；According to the plurality of adaptation frequency gain and the adaptation frequency relation matrix, a gain of each bandpass filter is calculated.
Description
Technical field
The present invention relates to a kind of hearing aid, more particularly to a kind of hearing aid and its automatic frequency-division filter gain control method.
Background technology
Wide dynamic range compression (WDRC) technology is used in the scope of hearing aid extensively.Found by long-time research,
User's demand can be met by starting time about 5ms, but recovery time changes as environment is different.Fig. 1 is to carry out
Wide dynamic range compression with change input audio signal hearing compensation curve schematic diagram.Curve 110 (dotted portion) refers to
The transformation curve of undressed input audio signal, i.e. input audio signal are equal to exports audio signal.120 (solid line of curve
Part) refer to transformation curve of the input audio signal by wide dynamic range compression processing, and can be according to input audio signal
It is strong and weak and be divided into four regions 131~134.The intensity of audio signal usually available dB SPL (sound pressure level,
Acoustic pressure degree) represent.Region 131 refers to High Linear (high linear) area's (being greater than 90dB SPL), namely listens barrier people
The saturation sound pressure level of scholar is not required to amplify as normal person.Region 132 refer to compress (compression) area (such as between 55~
90dB SPL), the dynamic range in domain is listened for adjusting user.Region 133 refers to that low linear (lowlinear) area (such as is situated between
In 40~55db SPL), it is used to help hearing-impaired people and amplifies faint speech sound.Region 134 refers to expand
(expansion) area's (being, for example, less than 40dB SPL), the intensity of audio signal in the region is quite weak, input audio signal
It may be the noise also smaller than voice sound signal, it is too many to be not required to amplification.In addition, the output terminal in hearing aid also has a sound
Limiter is measured, for limiting the max volume of exports audio signal, such as is limited within 110dB SPL.
In general, hearing-impaired people in hearing aids, can be directed to the sound attenuation curve of hearing-impaired people to respective
Different frequency carries out gain compensation.Because each frequency of input audio signal has different gains, if input audio signal is drawn
It is divided into that the quantity of different frequency bands (band) is excessive, then the scope of each frequency band is relatively small, such as Fourier transform can be passed through
Input audio signal is changed to frequency domain (frequency domain) from time domain (time domain), can be directed at this time indivedual
Frequency adjust corresponding gain, but opposite, the calculation amount of Fourier transform is very big, will also result in the audio in hearing aid
The sizable burden of process circuit.
Therefore, it is necessary to a kind of hearing aid and its automatic frequency-division filter gain control method to solve the above problems.
The content of the invention
The present invention provides a kind of hearing aid, including：One audio input end, for receiving an input audio signal, and should
Input audio signal is converted to an input digital signal；One audio frequency processing circuit, for performing one certainly to the input electrical signals
Frequency-division filter gain control method is moved to produce an output digit signals；And an audio output, for by output numeral
Signal is converted to an exports audio signal and plays out, and wherein the automatic frequency-division filter gain control method includes：Taking one makes
The hearing attenuation curve of user；Calculate the sound attenuation curve multiple adaptation frequency gains accordingly；To an input audio letter
A segmentation bandpass filter number is applied mechanically, the wherein segmentation bandpass filter includes multiple bandpass filters for different frequency bands；
Calculate the corresponding adaptation frequency relation matrix of the segmentation bandpass filter institute；According to the plurality of adaptation frequency gain and the adaptation
Frequency relation matrix, calculates a gain of each bandpass filter.
The present invention also provides a kind of automatic frequency-division filter gain control method, for hearing aid, the wherein hearing aid includes
One audio input end, an audio frequency processing circuit, an audio output, and receive an input audio letter using the audio input end
Number, and the input audio signal is converted into an input digital signal；Using the audio frequency processing circuit to the input electrical signals
An automatic frequency-division filter gain control method is performed to produce an output digit signals；It is and using the audio output that this is defeated
Go out digital signal to be converted to an exports audio signal and play out, wherein the automatic frequency-division filter gain control method includes：
Take the hearing attenuation curve of a user；Calculate the sound attenuation curve multiple adaptation frequency gains accordingly；Inputted to one
Audio signal applies mechanically a segmentation bandpass filter, and the wherein segmentation bandpass filter includes filtering for multiple band logicals of different frequency bands
Ripple device；Calculate the corresponding adaptation frequency relation matrix of the segmentation bandpass filter institute；According to it is the plurality of adaptation frequency gain and
The adaptation frequency relation matrix, calculates a gain of each bandpass filter.
Brief description of the drawings
Fig. 1 is to carry out wide dynamic range compression to change the schematic diagram of the hearing compensation curve of input audio signal.
Fig. 2 is the block diagram according to the hearing aid in one embodiment of the invention.
Fig. 3 A and Fig. 3 B are the schematic diagrames of the distribution of different bandpass filters.
Fig. 4 A and Fig. 4 B are the schematic diagrames according to the distribution of the different bandpass filters in one embodiment of the invention.
Fig. 5 is the flow chart according to the automatic frequency-division filter gain control method in one embodiment of the invention.
Fig. 6 is according to the sound attenuation curve and the schematic diagram of adaptation curve in one embodiment of the invention.
Description of reference numerals：
110th, 120~curve 131-134~region
200~hearing aid, 210~audio input end
211~microphone, 212~analog-digital converter
220~audio frequency processing circuit, 230~audio output
231~receiver, 232~digital analog converter
10~input audio signal 11~input electrical signals
12~input, 14~output digit signals of digital signal
15~output electric property, 16~exports audio signal of signal
311-314,411-414~curve 510-550~square
Embodiment
To enable the features described above of the present invention and advantage to become apparent, special embodiment below, and coordinate institute's attached drawing to make
Describe in detail as follows.
Fig. 2 is the block diagram according to the hearing aid in one embodiment of the invention.In one embodiment, hearing aid 200 includes
One audio input end 210, an audio frequency processing circuit 220, an audio output 230.Audio input end 210 includes a microphone
211 and an analog-digital converter (analog-to-digital converter, ADC) 212.Microphone 211 is used to receive an input
Audio signal 10 (being, for example, a simulated audio signal), and the input audio signal 10 is converted to an input electrical signals by this
11, which is converted to an input digital signal 12 as audio frequency processing circuit 220 by digital analog converter 112
Input.
Audio frequency processing circuit 220 to the input digital signal 12 carry out an automatic frequency-division filter gain control method and/or
Wide dynamic range compression is handled to produce an output digit signals 14.The details of wherein automatic frequency-division filter gain control method will
After being specified in.It is to be understood that it is bent to include a predetermined wide dynamic range compressing and converting in above-mentioned wide dynamic range compression processing
Line, it is the difference for the hearing characteristics of each user, carries out the audiometry of the various amounts of listening and frequency in advance, and then obtain
A other wide dynamic range compressing and converting curve.In addition, when the intensity of sound of input audio signal produces change, audio frequency process
Circuit 220 can also be adjusted correspondingly the recovery time of hearing aid 200, and then allow hearing-impaired people to have more preferably user's body
Test.In certain embodiments, audio frequency processing circuit 220 can be a microcontroller (microcontroller), a processor,
One digital signal processor (DSP) or application-oriented integrated circuit (ASIC), but the present invention is not limited thereto.
Still further, audio frequency processing circuit 220 can refer to the input audio and believe when carrying out wide dynamic range compression
Number 10 relevant recovery time factors are to adjust the delay of exports audio signal 16 (i.e. recovery time).Audio output 230
Such as include a receiver (receiver) 231 (or loudspeaker) and a digital analog converter 232.Digital analog converter 232 is used for sound
Output digit signals 14 are converted to output electric property signal 15 caused by frequency process circuit 220.Receiver 231 then can be by output electricity
Property signal 15 be converted to exports audio signal 16 (be, for example, a simulated audio signal) and play out for user listen to it is defeated
Go out audio signal 16.For convenience of description, in embodiment below, omitting will turn between audio signal and electrical signals
Change, and illustrated using only input audio signal and exports audio signal.
Fig. 3 A and Fig. 3 B are the schematic diagrames of the distribution of different bandpass filters.For example, domain bandpass filtering when in use
During device, different frequency ranges can be directed to corresponding bandpass filter is set, the bandpass filter as being used for low-frequency band in Fig. 3 A
310 and the bandpass filter 311 for high frequency band, and for the bandpass filter 312 of low-frequency band in Fig. 3 B and for high frequency
Shown in the bandpass filter 313 of band.However, the intermediate frequency of each frequency band must maintain identical gain.However, in high frequency
When having gain, the discontinuity in its boundary area between different frequency bands is more serious.
Fig. 4 A and Fig. 4 B are the schematic diagrames according to the distribution of the different bandpass filters in one embodiment of the invention.It is real one
Applying in example, the present invention combines the larger bandpass filter of filtered bands, can there is different gains in different frequencies, and
It is more continuous in the change of the juncture area of different frequency bands, as being used for the bandpass filter 410 of low-frequency band in Fig. 4 A and for height
The bandpass filter 411 of frequency band, and the bandpass filtering for the bandpass filter 412 of low-frequency band in Fig. 4 B and for high frequency band
Shown in device 413.It is noted that it is by taking two frequency bands as an example, in implementation described later in figs. 4 a and 4b for convenience of description
In example, illustrated by taking four frequency bands as an example.Compared to the bandpass filter in Fig. 3 A and Fig. 3 B, in figs. 4 a and 4b
Slope of the bandpass filter in frequency band both sides is more gentle.
Fig. 5 is the flow chart according to the automatic frequency-division filter gain control method in one embodiment of the invention.In square
510, take the hearing attenuation curve of user.For example, the present invention be directed to the hearing inspection of user (i.e. hearing-impaired people)
Survey is measured using four class frequency f1~f4 of adaptation, such as f1=500Hz, f2=1000Hz, f3=2000Hz, f4=
4000Hz, the sound attenuation curve of hearing-impaired people is confirmed with this.
In square 520, an adaptation frequency gain processing is carried out.For example, can be taken for different hearing loss curves
With a variety of adaptation methods (half gain method, 1/3 gain method, POGOII methods, Berger methods, NAL-R methods etc.), with
This obtains the yield value G relative to test frequency500、G1000、G2000、G4000.The ratio of sound attenuation curve and adaptation curve
Fig. 6 is relatively referred to, wherein sound attenuation curve is curve 610, and adaptation curve is curve 620.It is noted that hearing declines
Subtracting curve and adaptation curve can be varied from the difference of the hearing-impaired people used.In one embodiment, it is of the invention
In be to use NAL-R methods to calculate yield value of the hearing loss curve in different test frequencies, but the present invention is not limited thereto.
In square 530, a segmentation bandpass filter is applied mechanically.For example, traditional finite impulse can be used to ring for the present invention
Answer (finite impulse response, FIR) bandpass filter bc (k).This finite impulse response (FIR) bandpass filter bc (k)
The suitable form w (k) of k-th of coefficient collocation.Segmentation bandpass filter is the bandpass filter for including different frequency bands, such as
The bandpass filter Bc (k) of each frequency band=bc (k) .w (k), wherein first band B1 are 0~1000Hz, and second band B2 is
1000~2000Hz, the 3rd frequency band B3 are 2000~4000Hz, and the 4th frequency band B4 is 4000~6000Hz.
In square 540, calculate bandpass filter Bc (k) and be adapted to frequency relation matrix accordingly.For example, it is of the invention
A string ripple signal of adaptation frequency is designed using a sampling frequency fs, string ripple signal can represent as follows：
String ripple signal is by the bandpass filter of each frequency band, and calculates its and is adapted to frequency relation matrix, such as above-mentioned
Step employs the bandpass filter and 4 adaptation frequency gains of 4 frequency bands, therefore is adapted to frequency relation matrix in this embodiment
For a 4x4 matrixes.For example, adaptation frequency relation matrix can represent as follows：
In simple terms, it is actually each although the bandpass filter Bc (k) of each frequency band is to calculate and obtain by form w (k)
Can there be junctional area in a bandpass filter both sides with other bandpass filters, therefore need to calculate it and influence each other, i.e., above-mentioned is suitable
With frequency relation matrix.
In square 550, the gain of each bandpass filter Bc (k) is calculated.For example, conversion adaptation frequency gain can be under
Column matrix represents：
In simple terms, be segmented bandpass filter be is represented with Bc (k), be adapted to frequency relation matrix be withRepresent, adaptation
Frequency gain be withRepresent, the gain needed for each bandpass filter isAnd the relational expression of above-mentioned parameter is：
At this time, the gain needed for each bandpass filter Bc (k) can be represented by the formula：
Adaptation frequency gain is calculated respectively in square 520 and 540And adaptation frequency relation matrixIt is therefore each
Gain needed for bandpass filter Bc (k)Can be according to known adaptation frequency gainAnd adaptation frequency relation matrixCalculate
And obtain, such as frequency relation matrix will be adapted toInverse matrix be multiplied by adaptation frequency gainTo obtain each bandpass filter Bc (k)
Required gain
Though the present invention is disclosed above with preferred embodiment, so it is not intended to limit the scope of the present invention, any affiliated skill
Have usually intellectual in art field, without departing from the spirit and scope of the present invention, when can do it is a little change and retouch, because
The scope of protection of the present invention is defined by those of the claims for this.
Claims (10)
1. a kind of hearing aid, including：
One audio input end, input numeral letter is converted to for receiving an input audio signal, and by the input audio signal
Number；
One audio frequency processing circuit, for producing one to the input electrical signals one automatic frequency-division filter gain control method of execution
Output digit signals；
One audio output, wherein should be certainly for the output digit signals to be converted to an exports audio signal and are played out
Dynamic frequency-division filter gain control method includes：
Take the hearing attenuation curve of a user；
Calculate the sound attenuation curve multiple adaptation frequency gains accordingly；
A segmentation bandpass filter is applied mechanically an input audio signal, and wherein the segmentation bandpass filter includes being used for different frequency bands
Multiple bandpass filters；
Calculate the corresponding adaptation frequency relation matrix of the segmentation bandpass filter institute；
According to the plurality of adaptation frequency gain and the adaptation frequency relation matrix, a gain of each bandpass filter is calculated.
2. hearing aid according to claim 1, it is characterised in that it is the plurality of adaptation frequency gain be respectively corresponding to 500Hz,
1000Hz, 2000Hz and 4000Hz.
3. hearing aid according to claim 1, it is characterised in that the segmentation bandpass filter is a finite impulse response (FIR) band
Bandpass filter.
4. hearing aid according to claim 1, it is characterised in that the audio frequency processing circuit is to utilize to have a predetermined sampling
The string ripple signal of frequency calculates the segmentation bandpass filter by the plurality of bandpass filter of the segmentation bandpass filter with this
The corresponding adaptation frequency relation matrix of institute.
5. hearing aid according to claim 1, it is characterised in that the audio frequency processing circuit is by the adaptation frequency relation square
One inverse matrix of battle array is multiplied by the adaptation frequency gain to obtain the gain needed for each bandpass filter.
6. a kind of automatic frequency-division filter gain control method, for hearing aid, the wherein hearing aid includes an audio input end, one
Audio frequency processing circuit, an audio output, and
An input audio signal is received using the audio input end, and the input audio signal is converted into input numeral letter
Number；
One automatic frequency-division filter gain control method is performed to the input electrical signals using the audio frequency processing circuit to produce one
Output digit signals；
The output digit signals are converted into an exports audio signal using the audio output and are played out, its feature exists
In the automatic frequency-division filter gain control method includes：
Take the hearing attenuation curve of a user；
Calculate the sound attenuation curve multiple adaptation frequency gains accordingly；
A segmentation bandpass filter is applied mechanically an input audio signal, and wherein the segmentation bandpass filter includes being used for different frequency bands
Multiple bandpass filters；
Calculate the corresponding adaptation frequency relation matrix of the segmentation bandpass filter institute；
According to the plurality of adaptation frequency gain and the adaptation frequency relation matrix, a gain of each bandpass filter is calculated.
7. automatic frequency-division filter gain control method according to claim 6, it is characterised in that the plurality of adaptation frequency increases
Benefit is respectively corresponding to 500Hz, 1000Hz, 2000Hz and 4000Hz.
8. automatic frequency-division filter gain control method according to claim 6, it is characterised in that the segmentation bandpass filter
For a finite impulse response (FIR) bandpass filter.
9. automatic frequency-division filter gain control method according to claim 6, it is characterised in that further include：
The plurality of bandpass filter using the string ripple signal with a predetermined sampling frequency by the segmentation bandpass filter, with
This calculates the corresponding adaptation frequency relation matrix of segmentation bandpass filter institute.
10. automatic frequency-division filter gain control method according to claim 6, it is characterised in that further include：
One inverse matrix of the adaptation frequency relation matrix is multiplied by the adaptation frequency gain to obtain needed for each bandpass filter
The gain.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610887232.2A CN107920320A (en) | 2016-10-11 | 2016-10-11 | Hearing aid and its automatic frequency-division filter gain control method |
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| CN201610887232.2A CN107920320A (en) | 2016-10-11 | 2016-10-11 | Hearing aid and its automatic frequency-division filter gain control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111131989A (en) * | 2018-10-30 | 2020-05-08 | 升展科技股份有限公司 | Audio correction system and method of use |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1391780A (en) * | 1999-11-22 | 2003-01-15 | 布瑞汉姆·扬大学 | Hearing aid device incorporating signal processing techniques |
| CN103222283A (en) * | 2010-11-19 | 2013-07-24 | Jacoti有限公司 | Personal communication device with hearing support and method for providing the same |
-
2016
- 2016-10-11 CN CN201610887232.2A patent/CN107920320A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1391780A (en) * | 1999-11-22 | 2003-01-15 | 布瑞汉姆·扬大学 | Hearing aid device incorporating signal processing techniques |
| CN103222283A (en) * | 2010-11-19 | 2013-07-24 | Jacoti有限公司 | Personal communication device with hearing support and method for providing the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111131989A (en) * | 2018-10-30 | 2020-05-08 | 升展科技股份有限公司 | Audio correction system and method of use |
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