CN108540893A - Impulse noise suppression method, system and earphone - Google Patents
Impulse noise suppression method, system and earphone Download PDFInfo
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- CN108540893A CN108540893A CN201810657251.5A CN201810657251A CN108540893A CN 108540893 A CN108540893 A CN 108540893A CN 201810657251 A CN201810657251 A CN 201810657251A CN 108540893 A CN108540893 A CN 108540893A
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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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
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
A kind of impulse noise suppression method of present invention proposition, system and earphone, are related to Audio Signal Processing field, this method includes：Current speech signal is obtained, judges whether current speech signal includes impulse noise signal；In the case where determining that current speech signal includes impulse noise signal, according to the intensity of current speech signal, the gain of speech enhan-cement is adjusted.The present invention is modified by the detection to impulse noise signal and based on the Strength co-mputation of current speech signal to current speech enhancing gain, has the function that weaken impulsive noise.Compared with prior art, this method is suitable for the online impulsive noise reduced under pattern of speech enhancement, weakens damage of the sporadic impulse noise to hearing user；This method calculation amount is small, and online calculating cycle is short, realizes simply, is easy to engineering construction.
Description
Technical field
The present invention relates to Audio Signal Processing fields, in particular to a kind of impulse noise suppression method, system and ear
Machine.
Background technology
Active noise reduction earphone is that the noise signal of current detection is generated noise cancellation signal by filter circuit, is based on the de-noising
Signal, secondary sound source generate de-noising sound wave, and de-noising sound wave and noise sound wave generate interference, in capable of effectively eliminating, low-frequency noise.
When user carries out voice communication during wearing active noise reduction earphone with the external world, ambient noise is blended in from what the external world was transmitted
In voice signal be typically located at 300Hz to 3400Hz frequency ranges, have with the active noise reduction frequency range for being in 50Hz to 1000Hz larger
Overlapping, therefore voice signal can also be partially removed, and the decrease of voice signal is caused, and reduce user and extraneous communication matter
Amount.
Since noise signal is difficult to be detached with voice signal, noise signal also just can not be independent with voice signal
Processing.For the voice signal in enhancing noise reduction process, the low-frequency noise of 300Hz or so is usually eliminated using active noise reduction techniques,
It is amplified for the voice signal for being mixed with high-frequency noises signal, while realizing noise elimination and speech enhan-cement.This side
Method the problem is that：The noise signal of voice signal and medium-high frequency is enhanced simultaneously.For more stable medium-high frequency
Noise, this enhancing effect damage hearing user smaller, and when there is impulsive noise, the noise duration is short but intensity
Greatly, the noise is further enhanced along with voice enhanced function, there is destructive injury to the hearing of user.
Invention content
In view of the above-mentioned problems, a kind of impulse noise suppression method of present invention proposition, system and earphone, to solve impulsive noise
To the damage problem of hearing user under pattern of speech enhancement.
In a first aspect, the present invention proposes a kind of impulse noise suppression method, including：
Current speech signal is obtained, judges whether the current speech signal includes impulse noise signal；
In the case where determining that current speech signal includes impulse noise signal, according to the strong of the current speech signal
Degree, adjusts the gain of speech enhan-cement.
Further, described to judge whether the current speech signal includes impulse noise signal, including：
The current speech signal is filtered, the first voice signal is obtained；
Based on first voice signal, judge whether current speech signal makes an uproar comprising the pulse using intensive analysis method
Acoustical signal.
Further, the intensive analysis method includes：
Calculate the intensity of first voice signal；
First 1 all voice signals to preceding n collection period apart from the current speech signal are calculated to be filtered
The average strength of signal afterwards；
Intensity and the average strength based on first voice signal judge whether the current speech signal wraps
Containing the impulse noise signal.
Further, the intensity based on first voice signal and the average strength judge the current language
Whether sound signal includes the impulse noise signal, including：
Intensity threshold is set；
Calculate the difference of the intensity and the average strength of first voice signal；
Based on the intensity threshold and the strength difference, judge whether the current speech signal makes an uproar comprising the pulse
Acoustical signal.
Further, in the case where determining that current speech signal includes impulse noise signal, according to the current speech
The intensity of signal adjusts the gain of speech enhan-cement, including：Based on the intensity threshold and the strength difference, reduces voice and increase
Strong yield value.
Second aspect, the present invention propose a kind of impulse noise mitigation system, including：Detection unit, judging unit and adjustment
Unit；
Detection unit is configured as obtaining the present sound signals；
Judging unit is configured as judging whether the current speech signal includes impulse noise signal；
Adjustment unit is configured as in the case where determining that current speech signal includes impulse noise signal, according to described
The intensity of current speech signal adjusts the gain of speech enhan-cement.
Further, the judging unit includes filter unit, storage unit, computing unit and judging unit；
The filter unit is configured as being filtered the current speech signal, obtains the first voice signal；
The storage unit is configured as storing first voice signal and 1 extremely before the current speech signal
All voice signals of preceding n collection period be filtered after signal；
The computing unit is configured as calculating the intensity of first voice signal and the average strength；
Judging unit is configured as working as according to described in the intensity of first voice signal and average strength judgement
Whether preceding voice signal includes the impulse noise signal.
The third aspect, the present invention propose a kind of earphone, including can realize the impulse noise mitigation system that second aspect proposes
The processor of system further includes speech-enhancement system, for enhancing voice signal, realizes voice enhanced function；
The processor is connect with the speech-enhancement system, the gain for adjusting the speech-enhancement system.
Further, further include that active noise reduction system and switching switch；
The active noise reduction system is for realizing active noise reduction function；
The switching switch between the active noise reduction function and the voice enhanced function for switching.
A kind of impulse noise suppression method of present invention proposition, system and earphone, are related to Audio Signal Processing field, this method
Including：Current speech signal is obtained, judges whether current speech signal includes impulse noise signal；Determining current speech signal
Including in the case of impulse noise signal, according to the intensity of current speech signal, the gain of speech enhan-cement is adjusted.The present invention passes through
Detection to impulse noise signal is simultaneously modified current speech enhancing gain based on the Strength co-mputation of current speech signal, reaches
To the effect for weakening impulsive noise.Compared with prior art, this method is suitable for the online pulse reduced under pattern of speech enhancement
Noise weakens damage of the sporadic impulse noise to hearing user；This method calculation amount is small, and online calculating cycle is short, realizes simply,
It is easy to engineering construction.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 shows a kind of impulse noise suppression method flow chart that embodiment 1 provides；
Fig. 2 shows speech enhancement gain change curve schematic diagrames in embodiment 1；
Fig. 3 shows a kind of impulse noise mitigation system structure diagram that embodiment 2 provides；
Fig. 4 show embodiment 2 provide a kind of impulse noise mitigation system in, judging unit structural schematic diagram；
Fig. 5 shows the structural schematic diagram for having located to implement a kind of earphone that 3 provide.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to the technology of the present invention
Scheme carries out clear, complete description.Obviously, the described embodiments are merely a part of the embodiments of the present invention, rather than complete
The embodiment in portion.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indicating or implying relative importance.Unless otherwise clearly defined and limited, term " connection ", " connected " should do broad sense
Understand, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be mechanical connection, also may be used
To be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary the company inside two elements
It is logical.For the ordinary skill in the art, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
Embodiment 1
Impulse noise suppression method flow chart as shown in Figure 1, the present embodiment 1 propose a kind of Impulsive Noise Mitigation Method,
Include the following steps：
S10：Current speech signal is obtained, judges whether current speech signal includes impulse noise signal；
S20：In the case where determining that current speech signal includes impulse noise signal, according to the current speech signal
Intensity adjusts the gain of speech enhan-cement.
It is inevitable also to enhance therewith in order to enhance the voice signal being included in ambient noise in voice enhanced function
Simultaneous ambient noise, when in ambient noise there are impulsive noise, the intensity of impulsive noise can on the basis of the original into
One step increases, and huge damage is caused to the hearing of user, therefore, it is necessary to adjust the gain of speech enhan-cement, impulse noise mitigation,
The intensity of impulsive noise is reduced, the hearing impairment to user is reduced.
Above-mentioned steps S10 includes the following steps：
S110：Current speech signal is filtered, the first voice signal is obtained；
S120：Based on the first voice signal, judge whether current speech signal includes the pulse using intensive analysis method
Noise signal.
In above-mentioned steps S110, after current speech signal is filtered by this, a part of non-pulse noise is filtered out
Interference of the noise to voice signal.
Include the following steps in above-mentioned steps S120：
S121：Calculate the intensity l of the first voice signal；
S122：First 1 all voice signals to preceding n collection period apart from current speech signal are calculated to be filtered
The average strength l of signal afterwardsm；
S123：Intensity l based on the first voice signal and average strength lmJudge whether current speech signal includes institute
State impulse noise signal.
Assuming that the intensity of the first voice signal is l, the preceding n collection period apart from current collection period to first 1 acquisition
Signal strength after the speech signal pre-processing in period is respectively ln, ln-1..., l1, then the average value l of signal strengthm=(ln 2+
ln-1 2+…+l1 2)1/2.Assuming that the sampling period is T, it is preferable that the total duration of preceding n collection period to preceding 1 collection period is
20ms, then n is 20ms/T roundings.
In step S123, include the following steps：
S1231：Intensity threshold l is setT；
S1232：Calculate the intensity l and average strength l of the first voice signalmDifference, which is denoted as the first intensity
Difference；
S1232：Based on intensity threshold lTWith the first strength difference, judge whether current speech signal makes an uproar comprising the pulse
Acoustical signal.
As △ l=l-lmMore than or equal to intensity threshold lTWhen, then illustrate to be mixed with impulsive noise letter in current speech signal
Number, when △ l are less than intensity threshold lTWhen, then illustrate there is no impulse noise signal in current speech signal.Intensity threshold lTSetting
The degree that hearing user damages can be determined according to varying strength noise, if intensity threshold lTWhat is be arranged is smaller, then to user's
Hearing protection effect is better, but the effect of speech enhan-cement can weaken；If intensity threshold lTWhat is be arranged is bigger, then to the hearing of user
Protecting effect is poorer, but the effect of speech enhan-cement can be promoted.
Speech enhancement gain change curve schematic diagram as shown in Figure 2, in step S20, including：Based on intensity threshold lT
With the first strength difference △ l, reduce the yield value of speech enhan-cement.Based on above-mentioned strength difference △ l and intensity threshold lTComparison
As a result, it is preferable that if △ l are less than or equal to lT, then speech enhancement gain g is remained unchanged, if △ l are more than or equal to lT, then voice is increased
Strong gain g is turned down.Assuming that current speech enhancing gain be g, correction amount g ', revised speech enhancement gain be g=g0 ×
G ', g ' value can be with △ l-lTValue inversely proportional relationship in a certain range.Assuming that the value range of g ' 0.01 to 1 it
Between, if △ l-lTMore than or equal to 3lT, then g '=0.01, g=0.01g0；If △ l-lTMore than or equal to lTAnd it is less than 3lT, then g ' with
△l-lTValue be inversely proportional, △ l-lTValue it is bigger, g ' is smaller.The value range of g ', g ' and △ l-lTBetween functional relation set
Surely it can be adjusted according to actual requirement.
Impulsive Noise Mitigation Method proposed by the present invention is by the detection to impulse noise signal, current speech signal filter
The Strength co-mputation of signal after wave processing, and then current speech enhancing gain is corrected, have the function that weaken impulsive noise.With it is existing
Technology is compared, and this method is suitable for the online impulsive noise reduced under pattern of speech enhancement, weakens sporadic impulse noise to user
The damage of hearing；This method calculation amount is small, and online calculating cycle is short, realizes simply, is easy to engineering construction.
Embodiment 2
Impulse noise mitigation system structure diagram as shown in Figure 3, the present invention propose that a kind of impulsive noise eliminates system,
Including detection unit 100, judging unit 200 and adjustment unit 300.
Detection unit 100 is configured as obtaining the present sound signals.
Judging unit 200 is configured as judging whether the current speech signal includes impulse noise signal.
Adjustment unit 300 is configured as in the case where determining that current speech signal includes impulse noise signal, according to institute
The intensity for stating current speech signal adjusts the gain of speech enhan-cement.
According to the data from judging unit 200, if status signal is true, illustrate that there are pulses in present sound signals
All voice signals of noise, the further pretreated signal strength of root present sound signals and several preceding collection period are pre-
The data such as signal strength that treated, adjustment current speech enhance gain；If status signal is false, then it represents that present sound signals
In be not present impulsive noise, maintain current speech enhance gain.
In one embodiment, judging unit structural schematic diagram as shown in Figure 4, judging unit 200 include：Filtering is single
Member 210, storage unit 220, computing unit 230 and judging unit 240；
Filter unit 210 is configured as being filtered the current speech signal, obtains the first voice signal.Tool
Body, filter unit 210 is filter circuit.
Storage unit 220 is configured as the first voice signal of storage and 1 to preceding n before the current speech signal
All voice signals of collection period be filtered after signal.To save memory space, in each calculating cycle, storage
Unit 220 increases the voice signal of this calculating cycle, and rejects the voice signal farthest apart from this calculating cycle, maintains storage
Voice signal total number is constant, moves in turn and updates storage the storage content of unit 220.
Computing unit 230 is configured as calculating the intensity l and average strength l of the first voice signalm.It can also be used to calculate
First strength difference and the first strength difference and intensity threshold lTThe second strength difference.
Judging unit 240 is configured as intensity l and average strength l according to the first voice signalmJudge current speech
Whether signal includes impulse noise signal.Specifically, judging unit 240 is according to the second strength difference from computing unit 230
Judge whether current speech signal includes the impulse noise signal, specifically, if the second strength difference is more than 0, judgement is worked as
Preceding voice signal includes impulse noise signal；If the second strength difference is less than 0, judge that current speech signal is made an uproar not comprising pulse
Acoustical signal.
Impulse noise mitigation system proposed by the present invention is, it can be achieved that the impulse noise suppression method proposed in embodiment 1.It should
Impulse noise mitigation system structure is simple, it is easy to accomplish.
Embodiment 3
In conjunction with shown in Fig. 5, the present invention proposes a kind of earphone, including can realize the impulse noise mitigation that embodiment 2 proposes
The processor 1 of system further includes, for enhancing voice signal, realizing voice enhanced function with speech-enhancement system 2.
In conjunction with shown in Fig. 5, in one embodiment, earphone further includes active noise reduction system 3 and switching switch 4；Actively
Noise reduction system is for realizing active noise reduction function；Switching switch between active noise reduction function and voice enhanced function for switching.
There is earphone pattern of speech enhancement and active noise reduction pattern, above two pattern can be switched over by switching on-off mode.Tool
Body, under active noise reduction pattern, full frequency band is realized using the hybrid filter including feedforward filter and feedback filter
Depth noise reduction, noise reduction are excellent.Under pattern of speech enhancement, low frequency range noise is eliminated using feedback filter, while to language
Sound signal is amplified, if occurring impulsive noise in voice signal amplification process, processor carries out speech enhancement gain
It corrects, by reducing hearing impairment of the gain reduction impulsive noise to headset user.
Obviously, it is apparent to those skilled in the art that, each step of above-mentioned design method, which can be used, leads to
Computing device realizes that they can be concentrated on a single computing device, or be distributed in multiple computing device institutes group
At network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are deposited
Storage be performed by computing device in the storage device, either they are fabricated to each integrated circuit modules or by it
In multiple modules or step be fabricated to single integrated circuit module to realize.In this way, the present invention is not limited to any specific
Hardware and software combine.
Unless specifically stated otherwise, the opposite step of the component and step that otherwise illustrate in these embodiments, digital table
It is not limit the scope of the invention up to formula and numerical value.
The technique effect and preceding method embodiment phase of the device that the embodiment of the present invention is provided, realization principle and generation
Together, to briefly describe, device embodiment part does not refer to place, can refer to corresponding contents in preceding method embodiment.
In all examples being illustrated and described herein, any occurrence should be construed as merely illustrative, without
It is as limitation, therefore, other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.
Flow chart and block diagram in attached drawing show the system, method and computer journey of multiple embodiments according to the present invention
The architecture, function and operation in the cards of sequence product.In this regard, each box in flowchart or block diagram can generation
A part for a part for one module, section or code of table, the module, section or code includes one or more uses
The executable instruction of the logic function as defined in realization.It should also be noted that in some implementations as replacements, being marked in box
The function of note can also occur in a different order than that indicated in the drawings.For example, two continuous boxes can essentially base
Originally it is performed in parallel, they can also be executed in the opposite order sometimes, this is depended on the functions involved.It is also noted that
It is the combination of each box in block diagram and or flow chart and the box in block diagram and or flow chart, can uses and execute rule
The dedicated hardware based system of fixed function or action is realized, or can use the group of specialized hardware and computer instruction
It closes to realize.
Claims (9)
1. a kind of impulse noise suppression method, which is characterized in that including：
Current speech signal is obtained, judges whether the current speech signal includes impulse noise signal；
In the case where determining that current speech signal includes impulse noise signal, according to the intensity of the current speech signal, adjust
The gain of whole speech enhan-cement.
2. impulse noise suppression method according to claim 1, which is characterized in that described to judge the current speech signal
Whether include impulse noise signal, including：
The current speech signal is filtered, the first voice signal is obtained；
Based on first voice signal, judge current speech signal whether comprising impulsive noise letter using intensive analysis method
Number.
3. impulse noise suppression method according to claim 2, which is characterized in that the intensive analysis method includes：
Calculate the intensity of first voice signal；
After first 1 all voice signals to preceding n collection period of the calculating apart from the current speech signal are filtered
The average strength of signal；
Intensity and the average strength based on first voice signal judge whether the current speech signal includes institute
State impulse noise signal.
4. impulse noise suppression method according to claim 3, which is characterized in that described to be based on first voice signal
Intensity and the average strength judge the current speech signal whether include the impulse noise signal, including：
Intensity threshold is set；
Calculate the difference of the intensity and the average strength of first voice signal；
Based on the intensity threshold and the strength difference, judge whether the current speech signal is believed comprising the impulsive noise
Number.
5. impulse noise suppression method according to claim 4, which is characterized in that determining that current speech signal includes arteries and veins
In the case of rushing noise signal, according to the intensity of the current speech signal, the gain of speech enhan-cement is adjusted, including：Based on institute
Intensity threshold and the strength difference are stated, the yield value of speech enhan-cement is reduced.
6. a kind of impulse noise mitigation system, it is characterised in that including：Detection unit, judging unit and adjustment unit；
Detection unit is configured as obtaining the present sound signals；
Judging unit is configured as judging whether the current speech signal includes impulse noise signal；
Adjustment unit is configured as in the case where determining that current speech signal includes impulse noise signal, according to described current
The intensity of voice signal adjusts the gain of speech enhan-cement.
7. impulse noise mitigation system according to claim 6, which is characterized in that the judging unit includes that filtering is single
Member, storage unit, computing unit and judging unit；
The filter unit is configured as being filtered the current speech signal, obtains the first voice signal；
The storage unit is configured as storing first voice signal and 1 extremely preceding n before the current speech signal
All voice signals of a collection period be filtered after signal；
The computing unit is configured as calculating the intensity of first voice signal and the average strength；
Judging unit is configured as judging the current language according to the intensity and the average strength of first voice signal
Whether sound signal includes the impulse noise signal.
8. a kind of earphone, including claim 1 can be realized to the processor of any one described in claim 5, feature exists
In further including speech-enhancement system, for enhancing voice signal, realize voice enhanced function；
The processor is connect with the speech-enhancement system, adjusts the gain of the speech-enhancement system.
9. earphone according to claim 8, which is characterized in that further include that active noise reduction system and switching switch；
The active noise reduction system is for realizing active noise reduction function；
The switching switch between the active noise reduction function and the voice enhanced function for switching.
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| CN109862463A (en) * | 2018-12-26 | 2019-06-07 | 广东思派康电子科技有限公司 | Earphone audio playback method, earphone and its computer readable storage medium |
| CN112804612A (en) * | 2021-03-25 | 2021-05-14 | 潍坊歌尔电子有限公司 | Earphone control method, earphone control device, earphone and computer readable storage medium |
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Application publication date: 20180914 |