CN102611977A - Universal-type hearing-aid function initial amplification curve and filter parameter collocation method - Google Patents
Universal-type hearing-aid function initial amplification curve and filter parameter collocation method Download PDFInfo
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- CN102611977A CN102611977A CN2012100337020A CN201210033702A CN102611977A CN 102611977 A CN102611977 A CN 102611977A CN 2012100337020 A CN2012100337020 A CN 2012100337020A CN 201210033702 A CN201210033702 A CN 201210033702A CN 102611977 A CN102611977 A CN 102611977A
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- 230000003321 amplification Effects 0.000 title abstract description 10
- 238000003199 nucleic acid amplification method Methods 0.000 title abstract description 10
- 230000010370 hearing loss Effects 0.000 claims abstract description 54
- 231100000888 hearing loss Toxicity 0.000 claims abstract description 54
- 208000016354 hearing loss disease Diseases 0.000 claims abstract description 54
- 206010011878 Deafness Diseases 0.000 claims abstract description 33
- 230000006870 function Effects 0.000 claims abstract description 27
- 238000007619 statistical method Methods 0.000 claims description 5
- 208000032041 Hearing impaired Diseases 0.000 claims description 3
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- 238000001514 detection method Methods 0.000 abstract description 2
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Abstract
The invention provides a universal-type hearing-aid function initial amplification curve and filter parameter collocation method, which comprises the following steps of: making statistics on pure tone conductance threshold audiogram representing mild, moderate and severe hearing losses according to a great deal of pure tone conductance hearing threshold data of hearing losses first; then, calculating to obtain a corresponding hearing compensation curve as an initial amplification curve by using common prescription formulas, such as NAL-RP (National Acoustics Laboratories-Revised Profound); and obtaining a standard frequency response of a filter by linear interpolation, and further designing parameters of an FIR (Finite Impulse Response) filter by using a window function method. The universal-type hearing-aid function initial amplification curve and filter parameter collocation method is suitable for a majority of common hearing loss patients, is easy to implement in many common hearing-related signal processors, is free of complex and time-consuming hearing detection, is simple to operate because switchover is only carried out among three filters, can be used for compensating the hearing loss and can gain better speech articulation.
Description
Technical field
The present invention relates to the hearing aid field; Initial amplified curve of particularly a kind of universal hearing-aid function and filter parameter collocation method; The present invention instructs the filter parameter configuration of emulation and practical applications through analyzing the initial amplification setting of three kinds of typical impaired hearing situation.The present invention can be widely used in containing the hearing compensation module of hearing-aid function equipment.
Background technology
Common hearing loss is mainly reflected in the raising that the patient finds out the sound sound pressure level to I.And this being lost in all maybe be different on each sound frequency.So when any hearing aid amplifies compensation, must set one according to the amplified curve of hearing loss at different frequency.If not so just increase volume, will cause " that listens sees, the does not hear " result who when the sound of listening to after electronic product commonly used amplifies, produces.
Summary of the invention
The purpose of this invention is to provide initial amplified curve of a kind of universal hearing-aid function and filter parameter collocation method, realize the common hearing loss patient of majority is compensated.
The present invention will solve is that existing hearing aid can not be set one according to the amplified curve of hearing loss at different frequency when amplifying compensation, causes when the sound of listening to after electronic product commonly used amplifies " that listens sees, does not hear " result of generation.
Invention provides initial amplified curve of a kind of universal hearing-aid function and filter parameter collocation method, may further comprise the steps at least:
The first step: the pure tone conductance threshold of audibility of three kinds of typical hearing losses of statistics: according to the pure tone conductance threshold of audibility data of a large amount of hearing losses; According to statistical method; Pure tone conductance value to each frequency in the multidata of comforming is carried out descending; Find median, listen threshold value as the representative conductance of this frequency; The pure tone conductance threshold audiogram of, moderate slight and three kinds of typical hearing losses of severe by representing of obtaining of statistical method, the common hearing impaired degree of objective sign;
Second step: prescriptive formula is calculated compensated curve: the pure tone conductance threshold of audibility of three kinds of typical hearing losses that count according to the first step, utilize prescriptive formula commonly used, and comprise NAL-RP, calculate corresponding hearing compensation curve, as initial amplified curve;
The 3rd step: linear interpolation method obtains the standard frequency response of filter: through the linear interpolation hearing compensation curve in second step, the result is as the standard amplitude-frequency response of next step filter; The detailed process of linear interpolation is following:
Suppose our known coordinate (x0, y0) with (x1, y1), then obtain with (x0, y0) with (x1, y1) definite straight line will obtain on this straight line the corresponding value y of a certain position x in [x0, x1] interval, utilize following formula to obtain:
The 4th step: FIR Filter Design parameter: according to the standard frequency response of the 3rd filter that obtain of step, according to the window function method, the FIR Filter Design parameter comprises exponent number, each rank coefficient of filter; The window function ratio juris is: the standard frequency response
of known filter, and the response
of design N rank FIR filter removes to approach
; Detailed process is following:
Obtain the unit-sample response of ideal filter according to following formula
, generally obtain thus
Be that unlimited row are long, can't use, therefore adopt finite term with approach unlimited with, and with finite term with carry out
(N-1)/2Limited time-delay, thereby by the system that the system of non-causal obtains cause and effect, reach physically realizable purpose, and the amplitude-frequency characteristic of filter is not influenced by time delay fully; The unit-sample response of the FIR filter that is therefore designed
Can be expressed as
With a window function
Product,
: general
Select Hamming window, form is following:
The described typical pure tone conductance threshold of audibility has reflected slightly, in the 8000Hz frequency range, the numerical value of typical hearing loss is unit with dB HL at 250Hz for moderate and three kinds of hearing losses of severe.
The prescriptive formula that described compensated curve uses has provided the yield value in 0 to the 8000Hz frequency range, is unit with dB.
Described slight, the moderate that goes out by a large amount of hearing loss data statisticss, the pure tone conductance threshold of audibility of severe hearing loss; Reflected slight, moderate, severe hearing loss in 0 to 8000Hz scope, the pure tone conductance threshold of audibility at typical frequencies place is than the extent of damage of normal ear.
Slight hearing loss is meant that 500Hz, 1000Hz, 2000Hz and 4000Hz pure tone conductance average threshold are in 26 ~ 40dB HL scope.
Described moderate hearing loss is meant that 500Hz, 1000Hz, 2000Hz and 4000Hz pure tone conductance average threshold are in 41 ~ 55dB HL scope.
Described severe hearing loss is meant that 500Hz, 1000Hz, 2000Hz and 4000Hz pure tone conductance average threshold are in 56 ~ 90dB HL scope.
Described prescriptive formula is characterized in that having provided linear or nonlinear gain.
Described FIR filter is made up of three digital filters, and each filter is realized a kind of hearing aid requirement; Switch through order between three digital filters, compensate different hearing losses, the FIR filter amplifies compensation targetedly to different hearing losses.
Filter parameter of the present invention relates generally to exponent number, the coefficient of FIR filter, conveniently on software or hardware device, realizes.
The present invention realizes in the relevant signal processor of a lot of hearing commonly used easily; Can be used as the amplification module in the signal processor; Input audio signal is gone into this module through over-sampling is laggard, and the sound after the output is that three kinds of typical hearing losses are compensated the digital audio signal after the amplification.
Need not to carry out the hearing detection of complicated and time consumption with the present invention, only need between three kinds of filters, switch, simple to operate, can compensate hearing loss, obtain speech articulation preferably.
Characteristics of the present invention are to need not special equipment and professional's operation.The present invention adds up the pure tone conductance threshold of audibility that obtains typical hearing loss according to common hearing loss, finds out initial amplified curve earlier.These amplified curves are being arranged, just can in the device that much needs simple hearing-aid function, realize effective amplification, like hearing-aid type mobile phone, walkman, all kinds of earplugs etc. with self-defined FIR filter.And the user only need in simple several amplification modes, to select an amplification effect the most clearly scheme get final product.
Description of drawings
Fig. 1 is a flow chart of the present invention.
Fig. 2-1 is the slight hearing loss pure tone conductance threshold audiogram of typical case.
Fig. 2-2 is the typical moderate hearing loss pure tone conductance threshold audiogram.
Fig. 2-3 is the typical severe hearing loss pure tone conductance threshold audiogram.
Fig. 3-1 is for utilizing the compensated curve figure of the slight hearing loss that prescriptive formula NAL-RP obtains.
Fig. 3-2 is for utilizing the compensated curve figure of the moderate hearing loss that prescriptive formula NAL-RP obtains.
Fig. 3-3 is for utilizing the compensated curve figure of the severe hearing loss that prescriptive formula NAL-RP obtains.
Fig. 4 obtains the standard frequency response of filter for linear interpolation method.
Fig. 5-1 is one of amplitude-frequency response chart of 100 rank FIR filters.
Fig. 5-2 be 100 rank FIR filters amplitude-frequency response chart two.
Fig. 5-3 be 100 rank FIR filters amplitude-frequency response chart three.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is further described.
Shown in Figure 1 is the flow chart of initial amplified curve of a kind of universal hearing-aid function according to the invention and filter parameter collocation method, and concrete steps comprise:
101, the pure tone conductance threshold of audibility of three kinds of typical hearing losses of statistics.
According to the pure tone conductance threshold of audibility data of a large amount of hearing losses, according to statistical method obtain representing slightly, the pure tone conductance threshold audiogram of moderate and three kinds of hearing losses of severe, the common hearing impaired degree of objective sign.
102, prescriptive formula is calculated compensated curve.
According to the pure tone conductance threshold of audibility of 101 three kinds of typical hearing losses counting, utilize prescriptive formula commonly used, like NAL-RP, calculate corresponding hearing compensation curve, as initial amplified curve.
103, linear interpolation method obtains the standard frequency response of filter.
Through the result-hearing compensation curve of linear interpolation 102, the result of interpolation is as the standard frequency response of next step filter.
104, FIR Filter Design parameter.
According to the standard frequency response of 103 filters that obtain, according to window function method FIR Filter Design parameter, like the exponent number of filter, each coefficient etc.
That Fig. 2-1 ~ Fig. 2-3 is followed successively by that statistics obtains is slight, the pure tone conductance threshold audiogram of moderate and severe hearing loss.
Three threshold audiograms are imported NAL software successively, utilize the prescriptive formula NAL-RP in this software, the real ear that obtains separately inserts gain, and promptly the hearing compensation curve is seen Fig. 3-1 ~ 3-3, and they are respectively slightly, the compensated curve of moderate and severe hearing loss.
These three compensated curves are carried out linear interpolation; Three standard frequency responses when obtaining next step Design of Filter; As shown in Figure 4; Among the figure 41 is the standard amplitude-frequency response response curve of the corresponding filter of slight hearing loss, and 42 is the standard amplitude-frequency response response curve of the corresponding filter of moderate hearing loss, and 43 is the standard amplitude-frequency response curve of the corresponding filter of severe hearing loss.
According to frequency response curve, utilize the window function method to design the FIR filter on 100 rank, its frequency response of simulator, amplitude-frequency response response curve is seen Fig. 5-1 ~ 5-3.
Above embodiment only in order to the explanation the present invention and and unrestricted technical scheme described in the invention; Therefore, although this specification has carried out detailed explanation to the present invention with reference to each above-mentioned enforcement,, those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the present invention; And all do not break away from the technical scheme and the improvement thereof of the spirit and the scope of invention, and it all should be encompassed in the middle of the claim scope of the present invention.
Claims (9)
1. initial amplified curve of universal hearing-aid function and filter parameter collocation method is characterized in that this kind method may further comprise the steps at least:
The first step: the pure tone conductance threshold of audibility of three kinds of typical hearing losses of statistics: according to the pure tone conductance threshold of audibility data of a large amount of hearing losses; According to statistical method; Pure tone conductance value to each frequency in the multidata of comforming is carried out descending; Find median, listen threshold value as the representative conductance of this frequency; The pure tone conductance threshold audiogram of, moderate slight and three kinds of typical hearing losses of severe by representing of obtaining of statistical method, the common hearing impaired degree of objective sign;
Second step: prescriptive formula is calculated compensated curve: the pure tone conductance threshold of audibility of three kinds of typical hearing losses that count according to the first step, utilize prescriptive formula commonly used, and comprise NAL-RP, calculate corresponding hearing compensation curve, as initial amplified curve;
The 3rd step: linear interpolation method obtains the standard frequency response of filter: through the linear interpolation hearing compensation curve in second step, the result is as the standard amplitude-frequency response of next step filter; The detailed process of linear interpolation is following:
Suppose our known coordinate (x0, y0) with (x1, y1), then obtain with (x0, y0) with (x1, y1) definite straight line will obtain on this straight line the corresponding value y of a certain position x in [x0, x1] interval, utilize following formula to obtain:
The 4th step: FIR Filter Design parameter: according to the standard frequency response of the 3rd filter that obtain of step, according to the window function method, the FIR Filter Design parameter comprises exponent number, each rank coefficient of filter; The window function ratio juris is: the standard frequency response
of known filter, and the response
of design N rank FIR filter removes to approach
; Detailed process is following:
Obtain the unit-sample response of ideal filter according to following formula
, generally obtain thus
Be that unlimited row are long, can't use, therefore adopt finite term with approach unlimited with, and with finite term with carry out
(N-1)/2Limited time-delay, thereby by the system that the system of non-causal obtains cause and effect, reach physically realizable purpose, and the amplitude-frequency characteristic of filter is not influenced by time delay fully; The unit-sample response of the FIR filter that is therefore designed
Can be expressed as
With a window function
Product,
: general
Select Hamming window, form is following:
。
2. initial amplified curve of universal hearing-aid function according to claim 1 and filter parameter collocation method, slight, moderate and three kinds of hearing losses of severe of it is characterized in that described typical pure tone conductance threshold of audibility reflection at 250Hz in the 8000Hz frequency range.
3. initial amplified curve of universal hearing-aid function according to claim 1 and filter parameter collocation method is characterized in that the prescriptive formula that described compensated curve uses provides the yield value in 0 to the 8000Hz frequency range, are unit with dB.
4. initial amplified curve of universal hearing-aid function according to claim 1 and filter parameter collocation method; It is characterized in that described slight, the moderate that is gone out by a large amount of hearing loss data statisticss, the pure tone conductance threshold of audibility of severe hearing loss, slight, the moderate of reflection, severe hearing loss are in 0 to 8000Hz scope.
5. initial amplified curve of universal hearing-aid function according to claim 1 and filter parameter collocation method; It is characterized in that slight hearing loss is meant 500Hz, 1000Hz, 2000Hz and 4000Hz, pure tone conductance average threshold is in 26 ~ 40dB HL scope.
6. initial amplified curve of universal hearing-aid function according to claim 1 and filter parameter collocation method; It is characterized in that described moderate hearing loss is meant 500Hz, 1000Hz, 2000Hz and 4000Hz, pure tone conductance average threshold is in 41 ~ 55dB HL scope.
7. initial amplified curve of universal hearing-aid function according to claim 1 and filter parameter collocation method; It is characterized in that described severe hearing loss is meant 500Hz, 1000Hz, 2000Hz and 4000Hz, pure tone conductance average threshold is in 56 ~ 90dB HL scope.
8. initial amplified curve of universal hearing-aid function according to claim 1 and filter parameter collocation method is characterized in that described prescriptive formula, have provided linear or nonlinear gain.
9. initial amplified curve of universal hearing-aid function according to claim 1 and filter parameter collocation method is characterized in that described FIR filter is made up of three digital filters, and each filter is realized a kind of hearing aid requirement; Switch through order between three digital filters, compensate different hearing losses, the FIR filter amplifies compensation targetedly to different hearing losses.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112487593A (en) * | 2019-08-22 | 2021-03-12 | 上海闻通信息科技有限公司 | Human ear hearing curve simulation method and device |
| CN112866856A (en) * | 2020-12-31 | 2021-05-28 | 广州由我科技股份有限公司 | Design method, system and equipment of ANC noise reduction Bluetooth headset filter |
| CN114997738A (en) * | 2022-07-18 | 2022-09-02 | 天津渤化讯创科技有限公司 | Algorithm for predicting risk of noise hearing loss and noise health risk management system |
| CN115175076A (en) * | 2022-06-30 | 2022-10-11 | 腾讯科技（深圳）有限公司 | Audio signal processing method and device, electronic equipment and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000078096A2 (en) * | 1999-06-15 | 2000-12-21 | Sarnoff Corporation | Hearing aid with an acoustical format |
| EP1853090A2 (en) * | 2006-05-04 | 2007-11-07 | Siemens Audiologische Technik GmbH | Method and device for determining the target gain curve of a hearing-aid |
| CN101868983A (en) * | 2007-11-22 | 2010-10-20 | 索内提克有限公司 | Method and system for providing hearing aids |
-
2012
- 2012-02-15 CN CN2012100337020A patent/CN102611977A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000078096A2 (en) * | 1999-06-15 | 2000-12-21 | Sarnoff Corporation | Hearing aid with an acoustical format |
| EP1853090A2 (en) * | 2006-05-04 | 2007-11-07 | Siemens Audiologische Technik GmbH | Method and device for determining the target gain curve of a hearing-aid |
| CN101868983A (en) * | 2007-11-22 | 2010-10-20 | 索内提克有限公司 | Method and system for providing hearing aids |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112487593A (en) * | 2019-08-22 | 2021-03-12 | 上海闻通信息科技有限公司 | Human ear hearing curve simulation method and device |
| CN112866856A (en) * | 2020-12-31 | 2021-05-28 | 广州由我科技股份有限公司 | Design method, system and equipment of ANC noise reduction Bluetooth headset filter |
| CN112866856B (en) * | 2020-12-31 | 2023-02-03 | 广州由我科技股份有限公司 | Design method, system and equipment of ANC noise reduction Bluetooth headset filter |
| CN115175076A (en) * | 2022-06-30 | 2022-10-11 | 腾讯科技（深圳）有限公司 | Audio signal processing method and device, electronic equipment and storage medium |
| CN114997738A (en) * | 2022-07-18 | 2022-09-02 | 天津渤化讯创科技有限公司 | Algorithm for predicting risk of noise hearing loss and noise health risk management system |
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Application publication date: 20120725 |