CN105489212A - Downlink active noise reduction device and method, and mobile terminal - Google Patents
Downlink active noise reduction device and method, and mobile terminal Download PDFInfo
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- CN105489212A CN105489212A CN201410473431.XA CN201410473431A CN105489212A CN 105489212 A CN105489212 A CN 105489212A CN 201410473431 A CN201410473431 A CN 201410473431A CN 105489212 A CN105489212 A CN 105489212A
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
- G10K11/17823—Reference signals, e.g. ambient acoustic environment
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1783—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
- G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17857—Geometric disposition, e.g. placement of microphones
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17879—General system configurations using both a reference signal and an error signal
- G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Telephone Function (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a downlink active noise reduction device and method and a mobile terminal. The device includes: a first sound wave collector used for collecting an environmental noise signal, obtaining a reference signal, and outputting the reference signal to a self-adaptive controller; a self-adaptive controller used for calculating a secondary signal used for implementing sound wave counteraction based on the received reference signal and forwardly or reversely adjusting the amplitude and phase of the secondary signal based on a received error signal; a secondary sound field transmitter used for sending out the secondary signal adjusted by the self-adaptive controller in a sound wave form; and a second sound wave collector used for collecting the environment noise signal and the secondary signal, superposing the two signals, obtaining an error signal and outputting the error signal to the self-adaptive controller. Through the downlink active noise reduction device, active noise reduction is applied to a mobile phone, thereby improving a local call receiving effect, and the downlink active noise reduction device has good market prospects.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of descending active noise reducing device, method and mobile terminal.
Background technology
In the communications field, often can run into the environment of strong noise, the impact of noise on voice communication is fatal.Because under high-noise environment, there will be voice by masking by noise, cause signal to noise ratio (S/N ratio) degradation, thus cause the audibility of voice and sharpness to decline.
Active noise reduction techniques the earliest as a kind of new technology for military communication.Before active noise reduction occurs, can only be the mode taking passive noise reduction, namely with whole earmuff, left-right ear be encased, with the sound insulation characteristics crossing earmuff, and in earmuff, increase sound-absorbing sponge, be reduced to the noise of intelligent's ear.But this method can only reduce high frequency, little to the Noise reduction of low frequency.Active noise reduction techniques has occurred that the active noise reduction of each series is worn after occurring.
Principle of noise reduction comprises two kinds the earliest: one is feed forward noise reduction, and one is feedback noise reduction.Ground unrest size near people's ear is gathered at the microphone of earmuff inside particular by device, the inverse noise of a kind of phase 180 degree is produced by circuit, loudspeaker carry out acoustic interference with ground unrest after releasing and superpose, thus effectively reduce ambient noise signal size.Its benefit is: while the speech quality improved, protect people's ear, and avoiding people's ear length time is exposed to the hearing impairment caused in high-noise environment.Active noise reduction obtains significant progress as a kind of new technology, turns to civil area gradually by military.
The noise reduction technology that current mobile phone exists, mainly concentrates on the speech quality how improving mobile phone sending direction, the diamylose gram noise reduction technology namely on ordinary meaning.How poor in noise circumstance this technology be placed on place (as public places such as office, restaurant, street) emphasis point, improves the signal to noise ratio (S/N ratio) of up speech, thus make the other end audition of call more clear.
But we also have a kind of phenomenon when knowing mobile phone communication, and the sound of the other side that namely can not hear clearly in a noisy environment, even if Headphone volume is adjusted to maximum by you, adjust various angle, it is fuzzyyer that you still listen.We know not by the electric signal size of raising receiver simply, improve volume, which increase the risk burning out receiver.Mobile phone on market all consistance have ignored noise and affects the sense of hearing of local call person, does not obtain concern.So far market there is not the mobile phone with descending active noise reduction to emerge.
Summary of the invention
The invention provides a kind of descending active noise reducing device, method and mobile terminal, can not filtering local call noise in order to solve in prior art intelligent mobile terminal, affect the problem of speech quality.
According to one aspect of the present invention, a kind of descending active noise reducing device is provided, comprises:
First sound wave collector, for gathering ambient noise signal, obtains reference signal, and exports described reference signal to adaptive controller;
Adaptive controller, for based on the reference signal received, calculates the secondary signal implementing sound wave counteracting, and based on the error signal received, adjusts amplitude and the phase place of secondary signal forward or backwards;
Secondary sound field transmitter, sends with sound wave form for the secondary signal after being adjusted by adaptive controller;
Second sound wave collector, for gathering the secondary signal that ambient noise signal and secondary sound field transmitter send, superposing the two, exporting adaptive controller to after obtaining error signal.
Alternatively, in device of the present invention, whether described first sound wave collector, also reaching the threshold value of setting, if so, then exporting the reference signal obtained to adaptive controller for detecting ambient noise present; Otherwise, judge current without the need to noise reduction process, terminate.
Alternatively, in device of the present invention, described adaptive controller, specifically for adopting preset XLMS adaptive algorithm, calculates amplitude and the phase place of secondary signal and adjustment secondary signal.
Alternatively, in device of the present invention, described adaptive controller, specifically comprises:
A/D converting unit, exports DSP after carrying out analog to digital conversion for the reference signal that received by adaptive controller and error signal;
DSP, for based on the reference signal received, calculates the secondary signal implementing sound wave counteracting, and based on error signal, adjusts amplitude and the phase place of secondary signal forward or backwards;
D/A converting unit, exports power amplifier unit to after the secondary signal after adjustment is carried out digital-to-analog conversion;
Power amplifier unit, exports secondary sound field transmitter to after secondary signal is carried out power amplification process.
Alternatively, in device of the present invention, described second sound wave collector is laid with the principle being infinitely close to secondary sound field transmitter; The type of device of described first sound wave collector, the second sound wave collector is microphone.
According to another aspect of the present invention, a kind of mobile terminal is provided, in described mobile terminal, is integrated with descending active noise reducing device of the present invention.
According to another aspect of the invention, a kind of descending active denoising method is provided, comprises:
Step 1, gathers ambient noise signal, obtains reference signal;
Step 2, based on described reference signal, calculates the secondary signal implementing sound wave counteracting;
Step 3, utilizes the current error signal obtained, and adjusts secondary signal amplitude and phase place forward or backwards;
Step 4, sends in the form of a sound wave by the secondary signal after adjustment;
Step 5, the secondary signal gathering ambient noise signal and send with sound wave form, obtains error signal after the two being superposed, and this error signal is supplied to step 3.
Alternatively, in the method for the invention, also comprise before described step 1: detect the threshold value whether ambient noise present reaches setting, if so, then continue to perform step 1; Otherwise, judge current without the need to noise reduction process, terminate.
Beneficial effect of the present invention is as follows:
Descending active noise reducing device of the present invention is by laying two sound collecting devices, achieve the extraction of noise signal and error signal, and achieved the real-time correction utilizing error signal to secondary signal by adaptive controller, thus reach in " dead zone " of local;
Be integrated with the mobile terminal of active noise reducing device, active noise reduction be applied on mobile terminal, improve local call reception, there are good market outlook.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural drawing of a kind of descending active noise reducing device provided by the invention;
Fig. 2 is the structural drawing of adaptive controller in the present invention;
Fig. 3 is the laying schematic diagram in the present invention, mobile terminal being laid sound collecting device;
Fig. 4 is the process flow diagram of a kind of descending active denoising method provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Can not filtering local call noise in order to solve in prior art intelligent mobile terminal, affect the problem of speech quality, the invention provides a kind of descending active noise reducing device, method and mobile terminal, described device is by arranging two sound collecting devices, a pickup outside noise signal is as reference signal, the error signal of the two is asked for for one by pick-up noise signal and secondary signal, to pass through error signal, control secondary sound source size, thus reach in " dead zone " of local, make noise signal reduce to minimum, this measure improves the intelligibility of downlink voice.Just by several specific embodiment, detailed implementation process of the present invention is set forth below.
Embodiment one
The embodiment of the present invention provides a kind of descending active noise reducing device, and as shown in Figure 1, described device specifically comprises:
First sound wave collector 110, for gathering ambient noise signal, obtains reference signal, and exports described reference signal to adaptive controller 120;
Adaptive controller 120, for based on the reference signal received, calculates the secondary signal implementing sound wave counteracting, and based on the error signal received, adjusts amplitude and the phase place of secondary signal forward or backwards;
Wherein, the secondary signal of offsetting in order to implement sound wave calculated ideally refers to the signal after Reference Signal phase overturn 180 degree, but because processing of circuit and sonic transmissions all exist time delay, so also need to revise the phase information of signal after upset according to Delay, the signal obtained after correction is the secondary signal calculated.
Further, the amplitude of adaptive controller 120 forward or oppositely adjustment secondary signal and phase place, decided by error signal, and final purpose is to after secondary signal adjustment, make the error of secondary signal and noise signal level off to zero, ideally equal zero.
Secondary sound field transmitter 130, sends with sound wave form for the secondary signal after being adjusted by adaptive controller 120;
Second sound wave collector 140, for gathering the secondary signal that ambient noise signal and secondary sound field transmitter 130 send, superposing the two, exporting adaptive controller 120 after obtaining error signal to.
Based on said structure framework and enforcement principle, provide several concrete and preferred implementation under the above constitution below, in order to refinement and the function optimizing descending active noise reducing device of the present invention, be specifically related to following content:
In the embodiment of the present invention, in order to reduce the energy loss that noise reduction brings, avoid waste, preferably, the first sound wave collector 110, when collecting neighbourhood noise, detects the threshold value whether ambient noise present reaches setting, if so, then the reference signal obtained is exported to adaptive controller 120; Otherwise, judge current without the need to noise reduction process, terminate.That is, when only having ground unrest larger, just open active noise reduction process, not all situations all carries out noise reduction process.
Further, in the embodiment of the present invention, the second sound wave collector 140 is laid with the principle being infinitely close to secondary sound field transmitter 130, better to receive the secondary signal that secondary sound field transmitter 130 sends;
Further, in the embodiment of the present invention, the type of device of the first sound wave collector 110, second sound wave collector 140 can be, but not limited to as microphone.
Further, in the embodiment of the present invention, adaptive controller 120, the XLMS adaptive algorithm that concrete employing is preset, calculates amplitude and the phase place of secondary signal and adjustment secondary signal.Certainly; it should be noted that; adopt XLMS adaptive algorithm to be a kind of example explanation, and not exclusive restriction adopts this algorithm realization, the algorithm that can realize the correlation function of adaptive controller 120 that those skilled in the art easily expect is all within protection thought range of the present invention.
Further, give the concrete structure composition of adaptive controller 120 in the embodiment of the present invention, with explanation adaptive controller 120 clearer from structure function aspect, as shown in Figure 2, adaptive controller 120 specifically comprises:
A/D converting unit 121, exports DSP122 after carrying out analog to digital conversion for the reference signal that received by adaptive controller 120 and error signal;
DSP122, for based on the reference signal received, calculates the secondary signal implementing sound wave counteracting, and based on error signal, adjusts amplitude and the phase place of secondary signal forward or backwards;
D/A converting unit 123, exports power amplifier unit 124 to after the secondary signal after adjustment is carried out digital-to-analog conversion;
Power amplifier unit 124, exports secondary sound field transmitter 130 to after secondary signal is carried out power amplification process.
In sum, descending active noise reducing device described in the embodiment of the present invention, by laying two sound collecting devices, achieves the extraction of noise signal and error signal, and achieved the real-time correction utilizing error signal to secondary signal by adaptive controller, thus reach in " dead zone " of local.
Embodiment two
The embodiment of the present invention provides a kind of mobile terminal, and this mobile terminal is integrated with the descending active noise reducing device described in embodiment one.Owing to being described in detail the structure of descending active noise reducing device in embodiment one, so the present embodiment does not repeat the structure after integrated again.
In order to descending active noise reducing device is better and mobile terminal merge, in the present embodiment, give the installation position of integrated rear first sound wave collector, the second sound wave collector and secondary sound field transmitter.Particularly, as shown in Figure 3, the first sound wave collector is arranged on the back side of mobile terminal; Secondary sound field transmitter is the receiver of mobile terminal; Second sound wave collector is arranged on the receiver position near mobile terminal.
Wherein, the laying principle of the first sound wave collector is: be laid in mobile terminal quilt cover not easily by the hand-held position of blocking of user.
Provide the present invention's preferred embodiment below, and combine the description to embodiment, provide ins and outs of the present invention further, can illustrate that mobile terminal realizes the process of descending active noise reduction better.
In the present embodiment:
The signal that P (t)--noise source sends;
X (t)--reference signal;
Y (t)--secondary signal;
E (t)--error signal.
In the present embodiment, the concrete control procedure that mobile terminal realizes descending active noise reduction is as follows:
(1) noise source sends acoustic signals P (t);
(2) the microphone MIC1 (the first sound wave collector) be positioned near the noise source of the receiver back side picks up reference signal x (t) (i.e. the noise signal of MIC1 collection), as the input of adaptive controller;
(3) adaptive controller calculates secondary signal y (t) under the effect of preset XLMS adaptive algorithm, exports receiver to, is sent in the form of a sound wave implement sound wave counteracting by receiver;
(4) noise source and receiver form primary sound field and secondary sound field respectively, the error microphone MIC2 (the second sound wave collector) be positioned near receiver receives the acoustic pressure of primary sound field and secondary sound field simultaneously, and both superpose and form error signal e (t);
(5) error signal e (t) input feedback is in adaptive controller, adaptive controller utilizes preset XLMS adaptive algorithm, according to the Controlling object function adjustment adaptive controller weight coefficient preset, thus adjust amplitude and the phase place of the current secondary signal calculated fast forward or backwards, and export the secondary signal after adjustment to receiver, sent in the form of a sound wave by receiver and implement sound wave counteracting.Repeat said process, until system is stable, form local " dead zone ".
In order to provide more ins and outs, the concrete structure (as shown in Figure 2) below in conjunction with adaptive controller carries out noise reduction process explanation.
Adaptive algorithm program is loaded in the DSP of adaptive controller.The MIC1 being positioned at the receiver back side gathers ambient background noise, as with reference to signal x (t), is entered in DSP by the sampling of A/D converting unit.
The DSP being mounted with adaptive algorithm exports secondary signal y (t) to receiver, is sent in the form of a sound wave implement sound wave counteracting by receiver.
Be positioned at the MIC2 near receiver, accept the acoustic pressure of primary sound field and secondary sound field as error microphone MIC2 simultaneously, both superpose and form error signal e (t), and error signal input feedback is in DSP.
DSP utilizes built-in adaptive algorithm, according to the Controlling object function adjustment controller weight coefficient preset, thus change secondary signal amplitude and phase place fast, y (t) is exported to receiver by D/A converting unit and power amplifier unit, until system is stable, form local stability active noise reduction.
And directly through D/A converting unit and power amplifier unit to receiver is exported for the call voice signal that mobile terminal receives.
In sum, mobile terminal described in the known embodiment of the present invention, by descending active noise reducing device, is applied to active noise reduction on mobile phone, improves local call reception, have good market outlook.
Embodiment three
The embodiment of the present invention provides a kind of descending active denoising method, as shown in Figure 4, comprising:
Step S401, gathers ambient noise signal, obtains reference signal;
Preferably, also comprise before this step: detect the threshold value whether ambient noise present reaches setting, if so, then continue to perform step S401; Otherwise, judge current without the need to noise reduction process, terminate.
Step S402, based on described reference signal, calculates the secondary signal implementing sound wave counteracting;
Step S403, utilizes the current error signal obtained, and adjusts secondary signal amplitude and phase place forward or backwards;
Step S404, sends in the form of a sound wave by the secondary signal after adjustment.
Step S405, the secondary signal gathering ambient noise signal and send with sound wave form, obtains error signal after the two being superposed, and this error signal is supplied to step S403.
Method described in the present embodiment, achieves the extraction of noise signal and error signal, and utilizes error signal to revise in real time secondary signal, thus reaches in " dead zone " of local.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. a descending active noise reducing device, is characterized in that, comprising:
First sound wave collector, for gathering ambient noise signal, obtains reference signal, and exports described reference signal to adaptive controller;
Adaptive controller, for based on the reference signal received, calculates the secondary signal implementing sound wave counteracting, and based on the error signal received, adjusts amplitude and the phase place of secondary signal forward or backwards;
Secondary sound field transmitter, sends with sound wave form for the secondary signal after being adjusted by adaptive controller;
Second sound wave collector, for gathering the secondary signal that ambient noise signal and secondary sound field transmitter send, superposing the two, exporting adaptive controller to after obtaining error signal.
2. device as claimed in claim 1, it is characterized in that, whether described first sound wave collector, also reaching the threshold value of setting, if so, then exporting the reference signal obtained to adaptive controller for detecting ambient noise present; Otherwise, judge current without the need to noise reduction process, terminate.
3. device as claimed in claim 1, is characterized in that, described adaptive controller, specifically for adopting preset XLMS adaptive algorithm, calculates amplitude and the phase place of secondary signal and adjustment secondary signal.
4. the device as described in claims 1 to 3 any one, is characterized in that, described adaptive controller, specifically comprises:
A/D converting unit, exports DSP after carrying out analog to digital conversion for the reference signal that received by adaptive controller and error signal;
DSP, for based on the reference signal received, calculates the secondary signal implementing sound wave counteracting, and based on error signal, adjusts amplitude and the phase place of secondary signal forward or backwards;
D/A converting unit, exports power amplifier unit to after the secondary signal after adjustment is carried out digital-to-analog conversion;
Power amplifier unit, exports secondary sound field transmitter to after secondary signal is carried out power amplification process.
5. device as claimed in claim 1, is characterized in that,
Described second sound wave collector is laid with the principle being infinitely close to secondary sound field transmitter;
The type of device of described first sound wave collector, the second sound wave collector is microphone.
6. a mobile terminal, is characterized in that, is integrated with the descending active noise reducing device described in claim 1 to 5 any one in described mobile terminal.
7. mobile terminal as claimed in claim 6, is characterized in that, in described descending active noise reducing device:
First sound wave collector is arranged on the back side of mobile terminal;
Secondary sound field transmitter is the receiver of mobile terminal;
Second sound wave collector is arranged on the receiver position near mobile terminal.
8. mobile terminal as claimed in claim 7, it is characterized in that, described first sound wave collector is laid in the mobile terminal back side not easily by the hand-held position of blocking of user.
9. a descending active denoising method, is characterized in that, comprising:
Step 1, gathers ambient noise signal, obtains reference signal;
Step 2, based on described reference signal, calculates the secondary signal implementing sound wave counteracting;
Step 3, utilizes the current error signal obtained, and adjusts secondary signal amplitude and phase place forward or backwards;
Step 4, sends in the form of a sound wave by the secondary signal after adjustment;
Step 5, the secondary signal gathering ambient noise signal and send with sound wave form, obtains error signal after the two being superposed, and this error signal is supplied to step 3.
10. method as claimed in claim 9, is characterized in that, also comprise before described step 1: detect the threshold value whether ambient noise present reaches setting, if so, then continues to perform step 1; Otherwise, judge current without the need to noise reduction process, terminate.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410473431.XA CN105489212A (en) | 2014-09-17 | 2014-09-17 | Downlink active noise reduction device and method, and mobile terminal |
| PCT/CN2014/091049 WO2016041247A1 (en) | 2014-09-17 | 2014-11-13 | Downlink active noise reduction apparatus and method, and mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410473431.XA CN105489212A (en) | 2014-09-17 | 2014-09-17 | Downlink active noise reduction device and method, and mobile terminal |
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| CN105489212A true CN105489212A (en) | 2016-04-13 |
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| CN201410473431.XA Withdrawn CN105489212A (en) | 2014-09-17 | 2014-09-17 | Downlink active noise reduction device and method, and mobile terminal |
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| WO (1) | WO2016041247A1 (en) |
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| CN107360318A (en) * | 2017-06-30 | 2017-11-17 | 维沃移动通信有限公司 | Voice de-noising method, device, mobile terminal and computer-readable recording medium |
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| CN111063333A (en) * | 2019-12-19 | 2020-04-24 | 湖南国声声学科技股份有限公司 | Adaptive noise reduction method, adaptive noise reduction system, adaptive noise reduction device, and computer-readable storage medium |
| CN111161700A (en) * | 2019-12-24 | 2020-05-15 | 上海电机学院 | Main channel time delay estimation method in space noise reduction system |
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