CN105681966A - Denoising method and electronic device - Google Patents
Denoising method and electronic device Download PDFInfo
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- CN105681966A CN105681966A CN201410668531.8A CN201410668531A CN105681966A CN 105681966 A CN105681966 A CN 105681966A CN 201410668531 A CN201410668531 A CN 201410668531A CN 105681966 A CN105681966 A CN 105681966A
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Abstract
The invention provides a denoising method. The denoising method comprises the steps of: splitting received voice into a plurality of voice segments, presetting a set energy numerical value, judging the voice segment as general voice and normally outputting the voice segment when the energy of the voice segment is larger than the set energy numerical value, and judging the voice segment as noise and carrying out energy processing, when the energy of the voice segment is smaller than the set energy numerical value.
Description
Technical field
The present invention relates to a kind of method reducing noise, in particular to a kind of can the method for control noise resize ratio in noise reduction process process.
Background technology
The mode reducing noise has many kinds, the known technology relevant to amplitude adjustment is as disclosed in " device of forgoing of background noise " of No. M277217th, the Taiwan Patent announced on October 01st, 2005, its device comprises an amplitude acquisition channel to block low voltage signal, in its invention, low voltage signal is identified as noise signal, therefore after being completely cut off, the sound played back by the high voltage signal (being also exactly normal sound) of channel smoothly, is the sound without noise jamming. But in the low voltage signal blocked, it is also possible to the sound containing non-noise, directly completely cuts off if being regarded as noise, sound during output will be caused different from former sound and natural not, therefore for adjust amplitude there to be necessity of improvement in the way of reducing noise.
Summary of the invention
The main purpose of the present invention is to provide a kind of method reducing noise.
For reaching above-mentioned object, the method for the reduction noise of the present invention comprises: this input sound is divided into multiple acoustic segment; And obtain a beta maximum energy referential data of an acoustic current segment.
Adjust the energy of this acoustic current segment according to a current reference ratio, wherein this current reference ratio is that this current reference ratio is less than or equal to 1 and be more than or equal to 0 according to comprising this beta maximum energy referential data and a setting energy values is calculated.
According to one embodiment of the invention, wherein this beta maximum energy referential data also determines according to the beta maximum energy of n acoustic segment before this acoustic current segment, wherein n be 0～180 (depending on every section of acoustic segment comprises how many sampling spots, and system sampling rate and determine; Assuming two crests (or two troughs) needing to contain 70Hz, when sampling rate is 44100Hz, each acoustic segment has 64 sampling spots, then n=9; When sampling rate is 192000Hz, each acoustic segment has 16 sampling spots, then n=171); When n is 0, this beta maximum energy referential data is the beta maximum energy of this acoustic current segment.
According to one embodiment of the invention, wherein this current reference ratio is that before also basis comprises one, a reference ratio is calculated, wherein this front reference ratio is the energy for adjusting this front acoustic segment, this front reference ratio is less than or equal to 1 and be more than or equal to 0, this front acoustic segment be this acoustic current segment before an acoustic segment.
According to one embodiment of the invention, wherein this current reference ratio is also calculated according to comprising a limit coefficient, this limit coefficient is for being less than 1 and be greater than 0, wherein acoustic energy rise and fall limit coefficient can be inconsistent, when for example acoustic energy rises, (current reference ratio is greater than a front reference ratio) limit coefficient can between 0.01～1, and acoustic energy decline (current reference ratio is less than a front reference ratio) limit coefficient can between 0.0004～0.1, the reason having this difference is that acoustic energy does not need the change too limiting reference ratio (to have normal sound just normally to export (allowing reference ratio become 1) as early as possible when rising, therefore limit coefficient can be bigger),And acoustic energy is when declining, the last or end syllable (amplitude is less) of normal sound is easily mistaken as noise and adjusts, and in order to not allow last or end syllable excessively adjust and noise reduction, therefore for can be relatively slow in the adjustment of reference ratio, that is limit coefficient can be less.
According to one embodiment of the invention, wherein refer to an acoustic amplitudes at this energy described in this beta maximum energy referential data and setting energy values.
According to one embodiment of the invention, wherein this setting energy values is between 30dB to 90dB.
Accompanying drawing explanation
Fig. 1 is the integrated stand composition of the osophone of the present invention.
Fig. 2 is the flow chart of steps of the acoustic processing module of the present invention.
Fig. 3 is the schematic diagram that input sound is cut to multiple acoustic segment.
Fig. 4 is the chart of multiple acoustic segment ratios of one embodiment of the invention.
Fig. 5 is the chart of multiple acoustic segment ratios of another embodiment of the present invention.
Fig. 6 is the chart of multiple acoustic segment ratios of yet another embodiment of the invention.
Wherein Reference numeral is:
Sound electronic installation 10 radio reception device 11
Acoustic processing module 12 loud speaker 13
Input sound 20 acoustic segment 21
User 81
Embodiment
For can more understand the technology contents of the present invention, it is described as follows especially exemplified by preferred embodiment.
Hereinafter please refer to the integrated stand composition that Fig. 1 is the osophone of the present invention.
The sound electronic installation 10 of the present invention comprises radio reception device 11, acoustic processing module 12 and loud speaker 13. Radio reception device 11, for receiving input sound 20, after transferring to acoustic processing module 12 to process, is broadcasted to user 81 by loud speaker 13. Radio reception device 11 can be microphone etc. any can the equipment of radio reception, loud speaker 13 (also can have amplifier) can be any equipment broadcast such as earphone, but the present invention is not limited with the above-mentioned device enumerated. Acoustic processing module 12 is generally audio effect processing chip collocation pilot circuit, amplification circuit is formed; Also can be treater, internal memory collocation pilot circuit, amplify the technical solution that forms of circuit. The emphasis of acoustic processing module 12 is the amplification process of voice signal, filter out noise, change sound frequency composition and in order to reach the process that the object of the invention needs, the firmware (firmware) that can arrange in pairs or groups new with the hardware known due to acoustic processing module 12 or software, therefore the hardware framework of acoustic processing module 12 repeats no more. The present invention's so-called sound electronic installation 10 can be for example by the special machine of hardware specialization, also can be small-size computer such as PDA, mobile phone, hearing aid earphone is (such as bluetooth earphone, there is chip or the treater of processing audio), or intelligent mobile phone and Personal Computer realize the present invention with software program. The sound electronic installation 10 of the present invention can be designed as what the person that listens to barrier used, therefore at acoustic processing module 12 so that frequency conversion can be processed, and voltage-frequency or move the functions such as frequency, but be not therefore to repeat no more the process of frequency due to the emphasis of the present invention.
Then please refer to Fig. 2, it is the flow chart of steps about acoustic processing module of the present invention. Separately please also refer to Fig. 3 and Fig. 4 to understand the present invention.
It is an object of the invention to the impact of overall sound energy reduces noise energy, according to the present embodiment, energy is defined as acoustic amplitudes. Judge that the mode of noise is as setting energy values as benchmark value, it is for example 40dB, general sound can be judged as more than the sound of 40dB, and the sound lower than 40dB can be judged as noise, the sound being judged as noise can be multiplied by certain ratio to reduce its energy, reduces the impact of noise. According to better embodiment, setting energy values is between 30dB to 90dB, setting energy values even can be up to the reason of 90dB, if using the device carrying this noise-reduction method when user takes the vehicles, only setting energy values certainly will be located at 30dB, but to be heightened to process bigger noise, such as 80dB.
Step 201: input sound 20 is divided into multiple acoustic segment 21.
Each acoustic segment time span suggestion be 0.0000833～0.1 second (when sampling rate is 192000Hz, each acoustic segment has 16 sampling spots, suggestion is 0.0000833 second) between, (perform in this mobile phone according to the computer program product of the present invention) as in the experiment of osophone with certain mobile phone, the time span of acoustic segment effect between 0.0001～0.1 second is pretty good, that is within every second, about have 10～10,000 acoustic segment, for convenience of description, the present embodiment shows 15 sections of acoustic segment.
Step 202: the beta maximum energy referential data obtaining an acoustic current segment, wherein beta maximum energy referential data also determines according to the energy of n acoustic segment before this acoustic current segment, wherein n is 0～180 (time span of each acoustic segment is more little substantially, and n can be bigger).
Beta maximum energy numerical value is the maximum numerical value of amplitude in acoustic segment, such as the beta maximum energy numerical value that in Fig. 3, for example A0, A1, A5, A6, A7, A8, A9, A10 are respectively in T0, T1, T5, T6, T7, T8, T9, T10 acoustic segment. Finding out beta maximum energy numerical value in the present embodiment to be through and find out maximum " amplitude " a certain section of acoustic segment, namely therefore set energy values is a setting " amplitude " numerical value. What n represented is the quantity of reference voice section, and when n is 0, acoustic processing module 12 is using the beta maximum energy of this section of acoustic current segment as beta maximum energy referential data; When n is 3, acoustic processing module 12 is using the beta maximum energy in this section of acoustic current segment and acoustic current segment first three section of acoustic segment as beta maximum energy referential data. Sampling mode about beta maximum energy referential data can be done to explain orally more in detail in the example of specification sheets after a while.
Step 203: according to the energy of a current reference ratio adjustment acoustic current segment, wherein reference ratio is according to comprising beta maximum energy referential data at present, one setting energy values, before one, a reference ratio and a limit coefficient are calculated, and current reference ratio is less than or equal to 1 and be more than or equal to 0.
After beta maximum energy referential data is found out, by acoustic processing module 12, " beta maximum energy referential data " can be calculated a current reference ratio divided by " setting energy values ", when beta maximum energy referential data is more than or equal to setting energy values, current reference ratio is more than or equal to 1, it represents that the acoustic segment with beta maximum energy referential data is a normal sound, current reference ratio can be modified to 1 without exception, should be noted, current reference ratio can take into account a front reference ratio and limit coefficient, therefore also can revise further again; When beta maximum energy referential data is less than setting energy values, this current acoustic segment can be judged to noise and process current reference ratio by acoustic processing module 12.
Mode for process noise is that " when section acoustic segment energy " and " after revising ratio " are carried out product to become when section acoustic segment energy, but, in order to prevent acoustic processing module 12 from noise acoustic segment excess processes causing naturally sound, therefore the present invention also comprises a limit coefficient, it is the correction amplitude for limiting reference ratio, limit coefficient is for effect when the reference ratio correction of the adjustment mode of reference ratio and n for convenience of description, when Fig. 4 to Fig. 5 illustrates, limit coefficient is 0.1 according to the present embodiment without exception, but experimental result in fact, acoustic energy rise and fall limit coefficient is not consistent (as shown in Figure 6), when for example acoustic energy rises, (current reference ratio is greater than a front reference ratio) limit coefficient can between 0.01～1, and acoustic energy decline (current reference ratio is less than a front reference ratio) limit coefficient can between 0.0004～0.1, the reason having this difference is that acoustic energy does not need the change too limiting reference ratio (to have normal sound just to export (allowing reference ratio become 1) as early as possible when rising, therefore limit coefficient can be bigger),And acoustic energy is when declining, the last or end syllable (amplitude is less) of normal sound is easily mistaken as noise and adjusts, and in order to not allow last or end syllable excessively adjust and noise reduction, therefore for can be relatively slow in the adjustment of reference ratio, that is limit coefficient can be less. Substantially the limit coefficient of the situation of acoustic energy decline can be less than the limit coefficient that acoustic energy rises. The numerical value of limit coefficient follows the length of acoustic segment relevant substantially, and the acoustic segment time is more short, and limit coefficient can be more little. Limit coefficient also can be relevant with the characteristic of other sound, such as, can also limit formula revise with reference to more than one, or the acoustic segment that rate value is 0.5～1 drawn close in case excess processes etc., therefore limit coefficient not necessarily fixed value to 1.
For the step that clear the present invention is above-mentioned, and the usage of limit coefficient, below please also refer to Fig. 2～5, illustrate how R1～R15 is calculated step by step with two embodiments.
It is illustrated in figure 4 the nomograph of one embodiment of the invention, the sampling of beta maximum energy referential data can be carried out after input sound 20 is divided into multiple acoustic segment, as n=0, representing now acoustic processing module 12 only can sample when the beta maximum energy of section acoustic segment is as the beta maximum energy referential data of its acoustic segment, the acoustic current segment for example judged now is as the acoustic segment of T0, and amplitude A 0 is the beta maximum energy referential data of T0 acoustic segment. The current reference ratio (=beta maximum energy referential data/setting energy values) calculated with A0 is greater than 1, and result of determination is a normal sound, and therefore its current reference ratio R0 ' can be modified to 1. With reason, current reference ratio the R1 '～R4 ' of T1～T4 is all modified to 1.
It is 0.6 (A5 energy/setting energy values) that the current reference ratio R5 of T5 calculates, must revise according to the current reference ratio of limit coefficient and front (R4 '), R5 is less than R4 ', therefore must using limit coefficient that R4 ' deducts a unit as the R5 ' (1-0.1=0.9) after revising.
It is 0.7 that the current reference ratio R6 of T6 calculates, must revise according to the current reference ratio of limit coefficient and front (R5 '), R6 is less than R5 ', therefore must using limit coefficient that R5 ' deducts a unit as the R6 ' (0.9-0.1=0.8) after revising. T7 no longer more to write.
It is 0.8 that the current reference ratio R8 of T8 calculates, must revise according to the current reference ratio of limit coefficient and front (R7 '), R8 is greater than R7 ', therefore must using limit coefficient that R7 ' increases by a unit as the R8 ' (0.7+0.1=0.8) after revising.
It is 0.8 that the current reference ratio R9 of T9 calculates, and must revise according to the current reference ratio of limit coefficient and front (R8 '), but R9 equals R8 ', therefore must not revise.
The current reference ratio R10 of T10 calculates as being greater than 1, must revise according to the current reference ratio of limit coefficient and front (R9 '), R10 is greater than R9 ', therefore must using limit coefficient that R9 ' increases by a unit as the R10 ' (0.8+0.1=0.9) after revising.
The current reference ratio R10 of T11 calculates as being greater than 1, must revise according to the current reference ratio of limit coefficient and front (R10 '), R11 is greater than R10 ', therefore must using limit coefficient that R9 ' increases by a unit as the R11 ' (0.9+0.1=1) after revising.
The acoustic segment of T12～T15 is identical with the alteration ruler of T0～T4, therefore does not repeat them here.
In brief, the ratio that each acoustic segment calculates is as the benchmark value compared, ratio according to front section and acoustic segment instantly is compared to each other, and after limit coefficient is done to increase and decrease, the ratio finally increasing and decreasing correction is only the ratio be used as and reduce acoustic energy.
The nomograph being illustrated in figure 5 another embodiment of the present invention, understands this embodiment please also refer to Fig. 3 and Fig. 5 to help. For example as n=1, representing now acoustic processing module 12 can judge when the beta maximum energy in section acoustic segment and its acoustic segment as the beta maximum energy referential data when disconnected acoustic segment the last period, the acoustic current segment for example judged now is as the acoustic segment of T1, but amplitude A 0 is big compared with A1, therefore A0 is the beta maximum energy referential data of T1 acoustic segment, but not A1. The current reference ratio (=beta maximum energy referential data/setting energy values) calculated with A0 is greater than 1, and result of determination is a normal sound, and therefore its current reference ratio R1 ' can be modified to 1. With reason, current reference ratio the R1 '～R4 ' of T2～T4 is all modified to 1.
According to above-mentioned rule, the beta maximum energy referential data that T5 adopts should be the beta maximum energy of T4, therefore reference ratio R5 (=A4/ sets energy values) is greater than 1 at present, and current reference ratio R5 ' is modified to 1.
The beta maximum energy referential data that T6 adopts should be the beta maximum energy (A6 > A5) of T6, therefore reference ratio R6 equals 0.7 at present, must revise according to the current reference ratio of limit coefficient and front (R5 '), R6 is less than R5 ', therefore must using limit coefficient that R5 ' reduces by a unit as the R6 ' (1-0.1=0.9) after revising.
The beta maximum energy referential data that T7 adopts should be the beta maximum energy (A7 < A6) of T6, therefore reference ratio R7 equals 0.7 at present, must revise according to the current reference ratio of limit coefficient and front (R6 '), R7 is less than R6 ', therefore must using limit coefficient that R6 ' reduces by a unit as the R7 ' (0.9-0.1=0.8) after revising.
The beta maximum energy referential data that T8 adopts should be the beta maximum energy (A8 > A7) of T8, therefore reference ratio R8 equals 0.8 at present, must revise according to the current reference ratio of limit coefficient and front (R7 '), but R8 equals R7 ', therefore must not revise.
The beta maximum energy that the beta maximum energy referential data that T9 adopts is T8 or T9 all can (A9=A8), therefore reference ratio R9 equals 0.8 at present, must revise according to the current reference ratio of limit coefficient and front (R8 '), but R9 equals R8 ', therefore must not revise.
The beta maximum energy referential data that T10 adopts should be the beta maximum energy (A10 > A9) of T10, therefore reference ratio R10 equals 0.8 at present, must revise according to the current reference ratio of limit coefficient and front (R9 '), R10 is greater than R9 ', therefore must using limit coefficient that R9 ' increases by a unit as the R10 ' (0.8+0.1=0.9) after revising.
The beta maximum energy of beta maximum energy referential data T10 or T11 that T11 adopts (A11 and A10 is all > 1), therefore reference ratio R11 is greater than 1 at present, must revise according to the current reference ratio of limit coefficient and front (R10 '), R11 is greater than R10 ', therefore must using limit coefficient that R10 ' increases by a unit as the R11 ' (0.9+0.1=1) after revising.
The acoustic segment of T12～T15 is identical with the alteration ruler of T0～T5, therefore does not repeat them here.
Should be noted, sound reference ratio default value at the beginning is 1, therefore the sound assuming two embodiments is just that (A0 is less than setting energy values to noise at the beginning, R0 < 1), it is according to the current reference ratio of limit coefficient and front, can be used as revising (1-limit coefficient=R0 ') from the limit coefficient of 1 minimizing one unit.
It is illustrated in figure 6 the chart of multiple acoustic segment ratios of yet another embodiment of the invention.Being equally be used as example with during n=0, acoustic processing module 12 only can sample when the beta maximum energy of section acoustic segment is as the beta maximum energy referential data of its acoustic segment, and the limit coefficient of the present embodiment can rise according to acoustic energy or different during decline.
The change of reference ratio when T4 to T8 is acoustic energy decline, decline limit coefficient can between 0.0004～0.1, and the present embodiment limit coefficient equals 0.05.
It is 0.6 that the current reference ratio R5 of T5 calculates, must revise according to the current reference ratio of limit coefficient and front (R4 '), R5 is less than R4 ', therefore must using limit coefficient that R4 ' deducts a unit as the R5 ' (1-0.05=0.95) after revising. T6 to T8 analogizes with this.
The change of reference ratio when T9 to T11 is acoustic energy rising, rising limit coefficient can between 0.01～1, and the present embodiment limit coefficient equals 0.1.
The current reference ratio R10 of T10 calculates as being greater than 1, must revise according to the current reference ratio of limit coefficient and front (R9 '), R10 is greater than R9 ', therefore must using limit coefficient that R9 ' increases by a unit as the R10 ' (0.8+0.1=0.9) after revising. T11 analogizes with this.
If the acoustic segment quantity n sampled in order to select beta maximum energy changes, and the ratio after correction will be different, and the amplitude of its sound adjustment also can be thereupon different. For asking convenient explanation, only with 0 and 1 as an example, but according to better embodiment, when sampling rate is 44100Hz, when each acoustic segment has 64 sampling spots, n 7～10 falls, compared with what can reach expection, object of making an uproar to n. More sampling acoustic segment quantity n object is: the amplitude tendency of sound itself is curve-like, and some acoustic segment being positioned at setting energy values itself is in fact the transition of curve and is not noise, if the quantity of sampling is crossed, therefore I haven't seen you for ages causes erroneous judgement.
It is noted that this kind of noise-reduction method is not necessarily only applicable to the real-time process of osophone, it can also be applicable to the sound processing apparatus of a Non real-time processing, such as the sound this method under one section of record is removed noise. Above are only embodiment, and unrestricted in embodiment. For example this does not depart from basic framework person of the present invention, all should be the interest field that this patent is advocated, and should be as the criterion with claim book.
Claims (11)
1. reducing a method for noise, be applied to a sound electronic installation (10), this sound electronic installation (10) is for receiving an input sound (20), it is characterised in that, the method comprises:
This input sound (20) is divided into multiple acoustic segment;
Obtain a beta maximum energy referential data of an acoustic current segment; And
Adjust the energy of this acoustic current segment according to a current reference ratio, wherein this current reference ratio is that this current reference ratio is less than or equal to 1 and be more than or equal to 0 according to comprising this beta maximum energy referential data and a setting energy values is calculated.
2. the method reducing noise as claimed in claim 1, it is characterised in that, this beta maximum energy referential data also determines according to the beta maximum energy of n acoustic segment before this acoustic current segment, and wherein n is 0～180; When n is 0, this beta maximum energy referential data is the beta maximum energy of this acoustic current segment.
3. the method reducing noise as claimed in claim 2, it is characterized in that, this current reference ratio is also calculated according to a reference ratio before comprising, wherein this front reference ratio is the energy for adjusting this front acoustic segment, this front reference ratio is less than or equal to 1 and be more than or equal to 0, this front acoustic segment be this acoustic current segment before an acoustic segment.
4. the method reducing noise as claimed in claim 3, it is characterised in that, this current reference ratio is also calculated according to comprising a limit coefficient, and when this current reference ratio is greater than this front reference ratio, this limit coefficient is between 0.01～1.
5. the method reducing noise as claimed in claim 3, it is characterised in that, this current reference ratio is also calculated according to comprising a limit coefficient, and when this current reference ratio is less than this front reference ratio, this limit coefficient is between 0.0004～0.1.
6. the method reducing noise as claimed in claim 3, it is characterized in that, this current reference ratio is also calculated according to comprising a limit coefficient, wherein this limit coefficient when this current reference ratio is greater than this front reference ratio, is greater than this limit coefficient when this current reference ratio is less than this front reference ratio.
7. the method for reduction noise as described in item as arbitrary in claim 1 to 6, it is characterised in that, refer to an acoustic amplitudes at this energy described in this beta maximum energy referential data and this setting energy values.
8. the method reducing noise as claimed in claim 7, it is characterised in that, this setting energy values is between 30dB to 90dB.
9. a sound electronic installation (10), comprise a radio reception device (11), one acoustic processing module (12), one loud speaker (13), for completing the acoustic processing module (12) of claim 1 to the claim 6 described method of arbitrary item, wherein this radio reception device (11) and this loud speaker (13) are electrically connected with this acoustic processing module (12), it is characterized in that, this acoustic processing module (12) comprising:
Sound (20) will be inputted and it will be divided into multiple acoustic segment module;
Obtain a beta maximum energy referential data module of an acoustic current segment; And
Adjust the energy module of this acoustic current segment according to a current reference ratio, wherein this current reference ratio is that this current reference ratio is less than or equal to 1 and be more than or equal to 0 according to comprising this beta maximum energy referential data and a setting energy values is calculated.
10. sound electronic installation as claimed in claim 9, it is characterised in that, refer to an acoustic amplitudes at this energy described in this beta maximum energy referential data and setting energy values.
11. sound electronic installations as claimed in claim 10, it is characterised in that, this setting energy values is between 30dB to 90dB.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1391212A (en) * | 2001-06-11 | 2003-01-15 | 阿尔卡塔尔公司 | Method for detecting phonetic activity in signals and phonetic signal encoder including device thereof |
| CN1527283A (en) * | 2003-03-04 | 2004-09-08 | 无敌科技股份有限公司 | Noise eliminating method |
| US20050271222A1 (en) * | 2003-08-04 | 2005-12-08 | Freed Daniel J | Frequency shifter for use in adaptive feedback cancellers for hearing aids |
| CN102547543A (en) * | 2010-12-10 | 2012-07-04 | 杨国屏 | Method for improving accuracy of sound heard by hearing-impaired listener and hearing aid |
-
2014
- 2014-11-19 CN CN201410668531.8A patent/CN105681966B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1391212A (en) * | 2001-06-11 | 2003-01-15 | 阿尔卡塔尔公司 | Method for detecting phonetic activity in signals and phonetic signal encoder including device thereof |
| CN1527283A (en) * | 2003-03-04 | 2004-09-08 | 无敌科技股份有限公司 | Noise eliminating method |
| US20050271222A1 (en) * | 2003-08-04 | 2005-12-08 | Freed Daniel J | Frequency shifter for use in adaptive feedback cancellers for hearing aids |
| CN102547543A (en) * | 2010-12-10 | 2012-07-04 | 杨国屏 | Method for improving accuracy of sound heard by hearing-impaired listener and hearing aid |
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| CN105681966B (en) | 2018-10-19 |
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