CN104539819A - Method for restraining mobile communication terminal wind noise - Google Patents

Abstract

The invention discloses a method for restraining a mobile communication terminal wind noise. The method for restraining the mobile communication terminal wind noise is characterized in that a wind noise is injected into an echo suppressor of a mobile communication terminal, and the wind noise is eliminated through the echo suppressor. According to the method for restraining the mobile communication terminal wind noise, a method of transforming the wind noise into an echo is adopted, a good noise suppression effect is achieved through using the echo suppressor with mature technology and good noise suppression effect for eliminating the wind noise, and a good method of decreasing the wind noise is provided for mobile communication terminal products.

Description

A kind of method suppressing mobile communication terminal wind noise

Technical field

The present invention relates to field of mobile communication, particularly a kind of method suppressing mobile communication terminal wind noise.

Background technology

In recent years, along with a large amount of of communications industry mobile communication terminal product popularize, mobile intelligent terminal is a large amount of universal especially in recent years, and human society has entered and then without communication cannot improve and live the adversely effected age.The top priority of these mobile communication terminals is conversed exactly, the environment for use of household fixed telephone is fairly simple, fixing, but for this portable equipment of mobile communication terminal, its operational environment is Protean, as long as the mankind can be movable local, is all the environment of mobile terminal product needed work substantially.Therefore, mobile terminal is difficult to only work in quieter, comfortable environment, and major part is all noisy, in chaotic environment, or even at strong wind, carries out work greatly in the rain.Therefore, in order to ensure speech quality, needing mobile phone when designing, considering the design of voice de-noising.

Summary of the invention

For the deficiencies in the prior art, the invention provides a kind of a kind of method suppressing mobile communication terminal wind noise that can play good noise suppression effect.

For achieving the above object, the invention provides a kind of method suppressing mobile communication terminal wind noise, it is characterized in that: by being injected in the echo suppressor of mobile communication terminal by wind noise, eliminating wind noise by echo suppressor.

Further, the method for described suppression mobile communication terminal wind noise, by arranging a wind noise detecting unit, sample wind noise collecting unit in mobile communication terminal; Described wind noise detecting unit, sample wind noise collecting unit are connected with the sef-adapting filter in echo suppressor; When wind noise detecting unit detects wind noise, open sample wind noise collecting unit, carry out the acquisition process work of wind noise, and then wind noise sample signal is injected in sef-adapting filter, eliminate wind noise by sef-adapting filter.

Further, when wind noise detecting unit detects that wind noise exists time, first judge whether voice call is in up communication process, if be in up call, do not open the recording of wind noise, when be in listen speech phase time, sample wind noise collecting unit records wind noise data now, by wind noise Data Update to last state, and in the process of more new data, judge whether the time upgrading buffering area arrives, if the time arrives, then stop recording, and by wind noise data copy in sef-adapting filter, carry out the injection of wind noise; Otherwise sample wind noise collecting unit continues to record wind noise data, upgrades and records buffering area.

Adopt technique scheme, a kind of method suppressing mobile communication terminal wind noise of the present invention, adopt mode wind noise being transformed into echo, utilize technology maturation, the method of wind noise eliminated by the echo suppressor that noise suppression effect is good, good noise suppression effect can be played, for mobile communication terminal product provides a kind of method of excellent reduction wind noise.

Accompanying drawing explanation

Fig. 1 is generation principle and the echo suppressor schematic diagram of the echo of mobile communication terminal in prior art;

Fig. 2 is that the echo cancellor of the echo suppressor of mobile communication terminal in prior art suppresses principle;

Fig. 3 is the Method And Principle schematic diagram of suppression mobile communication terminal wind noise of the present invention;

Fig. 4 is the method flow schematic diagram of suppression mobile communication terminal wind noise of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

Refer to Fig. 1, Fig. 1 is generation principle and the echo suppressor schematic diagram of the echo of mobile communication terminal in prior art, in mobile communication terminal product, the production process of echo is as follows: at local near-end, after the voice of far-end caller send over, played back in the form of a sound wave by the loud speaker of local near-end, sound wave is through the propagation in room and reflect to form repeated voice, this voice signal is gathered by local microphone and sends back far-end again, causes calling out the echo hearing oneself sound.Here, speech data by air transmission to near-end Mike, it is only a kind of circulation way of echo, for mobile communication terminal earphone, the voice that loud speaker sends can also by other propagated such as Mobile communication terminal casings on the mobile communication terminal Mike of near-end, therefore, structurally, be very strict to the design of mobile communication terminal microphone and loud speaker.To reduce this echo as far as possible, close this echo travel path.When the echo transmission time is greater than 50ms time, people just can hear and oneself sound produce uncomfortable sensation.Therefore echo must be contained.Be in Fig. 1, echo suppressor be exactly suppression for this sound and design.

Refer to Fig. 2, Fig. 2 is that the echo cancellor of the echo suppressor of mobile communication terminal in prior art suppresses principle; The general principle of echo suppressor is carry out System Discrimination with LRM (Louderspeaker-Room-Microphone) the acoustic feedback passage of a sef-adapting filter to the unknown, analog echo path, by the adjustment of adaptive filter algorithm, its impulse response is approached mutually with actual echo path, thus obtain echo prediction signal, again by prediction signal from microphones to voice signal deduct, can echo cancelltion be realized.In fig. 2: the echo cancelltion prediction signal that echo suppressor produces is r ' (k), and actual echo signal is r (k), and predictive error signal is e (k); By the process that formula sound returns counteracting be then:

e(k)＝r(k)-r′(k) (1)；

$r^{\′}\left(k\right)=\underset{n=0}{\overset{N-1}{\mathrm{\Σ}}}\hat{h}\left(k\right)\·x(k-n)---\left(2\right);$

As shown in Figure 2, the core of Acoustic echo cancellation is a self adaptation ripple device; The major issue that sef-adapting filter will be considered in using optimizes and revises the criterion of filter parameter, and this criterion not only will provide significant tolerance to performance of filter.And attainable algorithm must be derived.Be fast convergence rate to the requirement of adaptive filter algorithm, computation complexity is low, good stability.Offset error is little.

Refer to Fig. 3, Fig. 3 is the Method And Principle schematic diagram of suppression mobile communication terminal wind noise of the present invention, as shown in Figure 3, first the inventive method gathers wind noise signal, then this wind to be made an uproar the entrance of data copy to sef-adapting filter, because sef-adapting filter itself is used to process wind noise, therefore, sef-adapting filter can be regarded echo processing, eventually pass through the calculating of sef-adapting filter, produce wind noise prediction signal, when real mixing has the voice signal of wind noise through echo suppressor, subtraction process will be done with wind noise suppressor prediction signal, thus deduct the wind noise signal be entrained in voice signal, reach the object suppressing wind noise.As described in Figure 2, by increasing wind noise detecting unit WND (Wind NoiseDetection), whether exist for detecting wind noise, sample wind noise collecting unit is opened in time there is wind noise, before the suppression carrying out wind noise, first carry out the acquisition process work of wind noise, and then wind noise sample signal is injected (namely memory data copy) to sef-adapting filter.

Refer to Fig. 4, the method flow schematic diagram of Fig. 4 suppression mobile communication terminal of the present invention wind noise; As shown in Figure 4, in time detecting that wind noise exists, first can judge whether voice call is in up communication process, if be in up call, not open the recording of wind noise, because now there is normal speech data, if gathered, normal speech data also can be regarded echo data process, if talker says same content, now due to the effect of echo suppressor what repeat, the normal voice of people can be filtered out, cannot remote processor be sent to.Therefore, the collection of wind noise sample is the normal voice data can not recording people, under normal circumstances, people are in the process of speech, between word and word, all gap is there is between sentence and sentence, therefore the wind noise signal will recorded not containing speech data is not a difficult thing, when people be in listen speech phase time, sample wind noise collecting unit records wind noise data now, be actually and upgrade wind noise data to last state, and to judge in the process of more new data whether the time upgrading buffering area arrives, if the time arrives, then stop recording, by the gateway unit of wind noise data copy to EC, carry out the injection of wind noise.Otherwise sample wind noise collecting unit continues to record wind noise data, upgrades and records buffering area.It should be noted that, Fig. 4 is only the flow process of a data processing, and in practice, this unit can repeat, to ensure to carry out data processing fast.The wind noise sample that final guarantee is injected is closest to last state.

Described above is only preferred embodiments of the present invention; certainly interest field of the present invention can not be limited with this; therefore; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art can make various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the present invention.

Claims (3)

1. suppressing a method for mobile communication terminal wind noise, it is characterized in that: by being injected in the echo suppressor of mobile communication terminal by wind noise, eliminating wind noise by echo suppressor.

2. a kind of method suppressing mobile communication terminal wind noise according to claim 1, it is characterized in that: the method for described suppression mobile communication terminal wind noise, by arranging a wind noise detecting unit, sample wind noise collecting unit in mobile communication terminal; Described wind noise detecting unit, sample wind noise collecting unit are connected with the sef-adapting filter in echo suppressor; When wind noise detecting unit detects wind noise, open sample wind noise collecting unit, carry out the acquisition process work of wind noise, and then wind noise sample signal is injected in sef-adapting filter, eliminate wind noise by sef-adapting filter.

3. a kind of method suppressing mobile communication terminal wind noise according to claim 2, it is characterized in that: when wind noise detecting unit detects that wind noise exists time, first judge whether voice call is in up communication process, if be in up call, do not open the recording of wind noise, when be in listen speech phase time, sample wind noise collecting unit records wind noise data now, by wind noise Data Update to last state, and in the process of more new data, judge whether the time upgrading buffering area arrives, if the time arrives, then stop recording, and by wind noise data copy in sef-adapting filter, carry out the injection of wind noise, otherwise sample wind noise collecting unit continues to record wind noise data, upgrades and records buffering area.