CN103179295A - Mobile terminal capable of removing echo and echo removing method thereof - Google Patents
Mobile terminal capable of removing echo and echo removing method thereof Download PDFInfo
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- CN103179295A CN103179295A CN 201110442057 CN201110442057A CN103179295A CN 103179295 A CN103179295 A CN 103179295A CN 201110442057 CN201110442057 CN 201110442057 CN 201110442057 A CN201110442057 A CN 201110442057A CN 103179295 A CN103179295 A CN 103179295A
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Abstract
The invention discloses a mobile terminal capable of removing echo and an echo removing method thereof. The mobile terminal capable of removing the echo comprises a loudspeaker, a microphone, an inverter, an audio processing unit and a signal superposition module. The loudspeaker makes a sound on the basis of a first audio signal generated by the audio processing unit, the inverter inverts the first audio signal, and the signal superposition module is used for receiving a second audio signal acquired by the microphone, performing superposition on the first audio signal inverted by the inverter and the second audio signal and sending the first audio signal and the second audio signal to the audio processing unit. The mobile terminal capable of removing the echo removes the echo through subtraction audio signals of sound played by the loudspeaker from the acquired audio signals. The mobile terminal capable of removing the echo adjusts audio signals acquired by the microphone and subtracted from the audio signals of the sound played by the loudspeaker through an amplitude adjusting module, thereby being capable of removing the echo thoroughly.
Description
Technical field
The present invention relates to a kind of filter sound mobile terminal and filter sound method thereof, particularly relate to a kind of mobile terminal of filtering echo and the method for filtering echo thereof.
Background technology
Present most of mobile device all possesses call function, and mobile call is seen everywhere in people's life process.The equipment that possesses call function often has the hand-free call function, and this function is to play the other side's voice by loud speaker, and gathers the voice of oneself by microphone.Wherein the volume of loud speaker is often larger, when being convenient to like this user and communication apparatus and keeping certain distance, still can be good voice messaging is passed.
Yet because the mobile device volume is often very little, the distance of loud speaker and microphone is generally very near, considers simultaneously attractive in appearance and factor convenient operation, and the distance between loud speaker and microphone may be less than certain safe distance.When this will cause conversing, the other side's voice send from loud speaker, and sealed in microphone, so the other side's voice transfer back to again on the other side's equipment, cause the other side to hear oneself to speak the phenomenon of sound, and the loud speaker of this moment and the voice signal of microphone also can produce self-excitation phenomena, at short notice generation be uttered long and high-pitched sounds, affect normal talking, even user's health caused harmful effect.
Summary of the invention
The technical problem to be solved in the present invention is in order to be easy to the defective of echogenicity phenomenon in the mobile terminal that overcomes prior art, a kind of mobile terminal of filtering echo and the method for filtering echo thereof are provided, by deducting the audio signal that described loud speaker plays sound in the audio signal of microphone collection, thus filtering echo.
The present invention solves above-mentioned technical problem by following technical proposals:
The invention provides a kind of mobile terminal of filtering echo, comprise a loud speaker and a microphone, be characterized in that described mobile terminal also comprises an inverter, an audio treatment unit and a signal laminating module; The one first audio signal sounding that wherein said loud speaker generates based on described audio treatment unit, described inverter is anti-phase with described the first audio signal, and described signal laminating module is used for receiving one second audio signal of described microphone collection and will superposeing and be sent to described audio treatment unit through inverter anti-phase the first audio signal and described the second audio signal.
Preferably, described mobile terminal also comprises an amplitude adjustment module, and described amplitude adjustment module be used for to be regulated the amplitude of the first audio signal after anti-phase through described inverter or without the amplitude of anti-phase described the first audio signal.
Preferably, described amplitude adjustment module comprises for increasing an amplifier of amplitude with for an attenuator that reduces amplitude.
The present invention also provides a kind of echo filtering method of mobile terminal, is characterized in using mobile terminal as above, and comprises the following steps: S
101, described audio treatment unit generates the first audio signal, described loud speaker is based on described the first audio signal sounding; S
102, described microphone collects the second audio signal, described inverter is anti-phase with described the first audio signal; S
103, described signal laminating module superposes described the second audio signal and described the first audio signal after anti-phase and be sent to described audio treatment unit.
Preferably, also comprise an amplitude adjustment module in described mobile terminal, described amplitude adjustment module be used for to be regulated the amplitude of the first audio signal after anti-phase through described inverter or without the amplitude of anti-phase described the first audio signal, step S
102For described microphone collects the second audio signal; And
Described inverter with described the first audio signal anti-phase and described amplitude adjustment module regulate the first audio signal after anti-phase, perhaps, the amplitude of described the first audio signal of described amplitude adjustment module adjusting and described inverter will be anti-phase through the first audio signal that amplitude is regulated.
Positive progressive effect of the present invention is:
The mobile terminal of filtering echo of the present invention, by deducting the audio signal that described loud speaker plays sound in the audio signal of microphone collection, thereby filtering echo.
Also regulate by the amplitude adjustment module audio signal that the microphone that deducts in the audio signal that described loud speaker plays sound gathers in the present invention in addition, thus can be further filtering echo up hill and dale.
Description of drawings
Fig. 1 is the structure chart of the first embodiment of the mobile terminal of filtering echo of the present invention.
Fig. 2 is the flow chart of echo filtering of the first embodiment of the mobile terminal of filtering echo of the present invention.
Fig. 3 is the structure chart of the second embodiment of the mobile terminal of filtering echo of the present invention.
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.
The first embodiment:
As shown in Figure 1, the mobile terminal of the filtering echo of the present embodiment comprises a loud speaker 1, a microphone 2, an inverter 3, an amplitude adjustment module 4, an audio treatment unit 5 and a signal laminating module 6.
Wherein said loud speaker 1 is sounded based on an output audio signal AS1 of described audio treatment unit 5 outputs, and described microphone 2 gathers the sound of mobile terminal external environment condition and generates one and gathers audio signal AS2.
Described inverter 3 is used for described output audio signal AS1 is anti-phase, and the described amplitude adjustment module 4 of the present embodiment is used for after described output audio signal AS1 is anti-phase, regulates the amplitude of the described output audio signal AS1 after anti-phase.
In addition described amplitude adjustment module 4 can also described output audio signal AS1 carry out anti-phase before, the amplitude of regulating described output audio signal AS1, after this described output audio signal AS1 through range-adjustings of 3 pairs of described inverters carry out anti-phase.Amplitude adjustment module 4 described in middle the present embodiment comprises an amplifier 41 and an attenuator 42, thereby can realize increasing and regulating or amplitude reduces to regulate carry out amplitude through the described output audio signal AS1 of described amplitude adjustment module 4.
Described signal laminating module 6 is used for and will will superpose and be sent to described audio treatment unit 5 through described output audio signal AS1 and described collection audio signal AS2 anti-phase and that amplitude is regulated.Because described microphone 2 can collect the sound that described loud speaker 1 sends, thereby echogenicity, so comprise the described output audio signal AS1 of part in the described collection audio signal AS2 that described microphone 2 gathers, therefore, by the described output audio signal AS1 in described collection audio signal AS2 stack is offset described collection audio signal AS2 through anti-phase described output audio signal AS1, thereby realized the elimination of echo.
Comprise in addition the described output audio signal AS1 of part in described collection audio signal AS2 due to described microphone 2 collections, so described output audio signal AS1 after anti-phase by described amplitude adjustment module 4 adjustings, thereby make the described output audio signal AS1 that comprises in described collection audio signal AS2 to be offset fully, thereby can fully suppress echo.Degree those skilled in the art of the adjusting of 4 couples of described output audio signal AS1 of wherein said amplitude adjustment module can correspondingly regulate according to setting position of microphone in mobile terminal design and loud speaker etc.
The operation principle of the present embodiment comprises the following steps as shown in Figure 2:
Step 104, described signal laminating module 6 are with described the second audio signal AS2 and described the first audio signal AS1 stack after anti-phase is concurrent is sent to described audio treatment unit 5.
The mobile terminal of the filtering echo of the present embodiment regulates by the amplitude adjustment module audio signal that the microphone that deducts in the audio signal that described loud speaker plays sound gathers, thus can be further filtering echo up hill and dale.
The second embodiment:
The mobile terminal difference of the mobile terminal of the present embodiment filtering echo and the filtering echo of the first embodiment is:
As shown in Figure 3, (TI company chip, described chip is a pair of channel operation amplifier, thereby realizes inverter 3 in the first embodiment and the function of amplitude adjustment module 4 to adopt a TLV2362 chip U1 in the present embodiment.
access input 1IN+ and the 2IN+ of described TLV2362 chip in wherein said loud speaker 1 by end INPUT_P and end INPUT_N, wherein said end INPUT_P and end INPUT_N access respectively the signal of positive pole of loud speaker 1 and the signal of negative pole, described signal laminating module 6 receives the signal of described TLV2362 output 1OUT and 2OUT by end OUTPUT_N and end OUTPUT_P, this moment, described end OUTPUT_N was corresponding to described end INPUT_P, described end OUTPUT_P is corresponding to described end INPUT_N, because the TLV2362 chip is the binary channels operational amplifier, so operation principle according to operational amplifier, the audio signal that described signal laminating module 6 receives and the output audio signal AS1 of described loud speaker 1 are anti-phase.
As shown in Figure 3, end VCC provide power supply for the TLV2362 chip, end CONTROL is used for controlling the Enable Pin of described TLV3262 chip operation, when system works, described end CONTROL makes described TLV3262 chip in running order, otherwise makes described TLV3262 chip be in the state of shutting down.
The input 1IN-of wherein said TLV2362 chip and 2IN-are connected with respectively resistance R 2 and resistance R 3, and output 1OUT and the 2OUT of described TLV2362 chip pass through resistance R! Be connected to respectively 1IN-and the 2IN-of the input of described TLV2362 chip.Because the TLV2362 chip is the binary channels operational amplifier, so operation principle according to operational amplifier, regulate the resistance ratio of described R1 and R2 and R1 and R3, can regulate the amplitude of the input signal of the input 1IN+ of described TLV2362 chip and 2IN+, thereby the adjusting of realization to the amplitude of the output audio signal AS1 of loud speaker 1, and export described signal laminating module 6 to by output 1OUT and 2OUT.Wherein the user's resistance ratio that can regulate as required described R1 and R2 and R1 and R3 changes the amplitude of the signal that exports described signal laminating module 6 to.
As shown in Figure 3 described in addition, remaining resistance and electric capacity are used for making the present embodiment TLV2362 chip U1 normal operation, and can adaptively be connected with the parts such as loud speaker 1, so those skilled in the art can and require to change structure and the annexation of circuit described in the present embodiment according to the needs of actual design.
In addition, all chips that the present embodiment is related or parts all can be realized at existing hardware foundation, not give unnecessary details therefore at this, its specific implementation process is not done.
The operation principle of the present embodiment is as follows:
Described audio treatment unit 5 generates the first audio signal AS1, the sine wave signal of 1KHz and 0dB for example, described loud speaker 1 is based on described the first audio signal AS1 sounding, and exports input 1IN+ and the 2IN+ of described TLV2362 chip U1 to by end INPUT_P and end INPUT_N.
Then, described microphone 2 collects the second audio signal AS2.And described TLV2362 chip U1 is anti-phase with described the first audio signal AS1, and the amplitude of simultaneously described TLV2362 chip U1 also being regulated the first audio signal AS1.Wherein the user can adjust the output to by regulating described R1 and R2 and R1 and R3 the amplitude of the audio signal of described signal laminating module 6.
At last, the first audio signal AS1 of regulating through anti-phase and amplitude of the output 1OUT of described TLV2362 chip U1 and 2OUT output and will described the second audio signal AS2 by end OUTPUT_N and end OUTPUT_P and described the first audio signal AS1 after anti-phase concurrent described audio treatment unit 5 that is sent to that superposes by described signal laminating module 6.
Although more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, protection scope of the present invention is limited by appended claims.Those skilled in the art can make various changes or modifications to these execution modes under the prerequisite that does not deviate from principle of the present invention and essence, but these changes and modification all fall into protection scope of the present invention.
Claims (5)
1. the mobile terminal of a filtering echo, comprise a loud speaker and a microphone, it is characterized in that, described mobile terminal also comprises: an inverter, an audio treatment unit and a signal laminating module;
The one first audio signal sounding that wherein said loud speaker generates based on described audio treatment unit, described inverter is anti-phase with described the first audio signal, and described signal laminating module is used for receiving one second audio signal of described microphone collection and will superposeing and be sent to described audio treatment unit through inverter anti-phase the first audio signal and described the second audio signal.
2. mobile terminal as claimed in claim 1, it is characterized in that, described mobile terminal also comprises an amplitude adjustment module, and described amplitude adjustment module be used for to be regulated the amplitude of the first audio signal after anti-phase through described inverter or without the amplitude of anti-phase described the first audio signal.
3. mobile terminal as claimed in claim 2, is characterized in that, described amplitude adjustment module comprises for increasing an amplifier of amplitude with for an attenuator that reduces amplitude.
4. the echo filtering method of a mobile terminal, is characterized in that, uses mobile terminal as claimed in claim 1, and comprise the following steps:
S101, described audio treatment unit generate the first audio signal, and described loud speaker is based on described the first audio signal sounding;
S102, described microphone collect the second audio signal, and described inverter is anti-phase with described the first audio signal;
S103, described signal laminating module superpose described the second audio signal and described the first audio signal after anti-phase and be sent to described audio treatment unit.
5. echo filtering method as claimed in claim 4, it is characterized in that, also comprise an amplitude adjustment module in described mobile terminal, described amplitude adjustment module be used for to regulate the amplitude of the first audio signal after anti-phase through described inverter or without the amplitude of anti-phase described the first audio signal, step S102 is that described microphone collects the second audio signal; And
Described inverter with described the first audio signal anti-phase and described amplitude adjustment module regulate the first audio signal after anti-phase, perhaps, the amplitude of described the first audio signal of described amplitude adjustment module adjusting and described inverter will be anti-phase through the first audio signal that amplitude is regulated.
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| CN 201110442057 CN103179295A (en) | 2011-12-26 | 2011-12-26 | Mobile terminal capable of removing echo and echo removing method thereof |
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| CN 201110442057 CN103179295A (en) | 2011-12-26 | 2011-12-26 | Mobile terminal capable of removing echo and echo removing method thereof |
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| CN103179295A true CN103179295A (en) | 2013-06-26 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103402038A (en) * | 2013-07-23 | 2013-11-20 | 广东欧珀移动通信有限公司 | Method and device for eliminating echo of receiver from opposite side in handfree state of mobile phone |
| CN105263081A (en) * | 2015-11-16 | 2016-01-20 | 北京祥雍智杰科技有限公司 | Feedback-suppressed earplug device |
| CN105516859A (en) * | 2015-11-27 | 2016-04-20 | 深圳Tcl数字技术有限公司 | Method and system for eliminating echo |
| CN106569774A (en) * | 2016-11-11 | 2017-04-19 | 青岛海信移动通信技术股份有限公司 | Method of eliminating noise, and terminal |
| CN108028982A (en) * | 2015-09-23 | 2018-05-11 | 三星电子株式会社 | Electronic equipment and its audio-frequency processing method |
-
2011
- 2011-12-26 CN CN 201110442057 patent/CN103179295A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103402038A (en) * | 2013-07-23 | 2013-11-20 | 广东欧珀移动通信有限公司 | Method and device for eliminating echo of receiver from opposite side in handfree state of mobile phone |
| CN103402038B (en) * | 2013-07-23 | 2016-05-04 | 广东欧珀移动通信有限公司 | Under Mobile phone hand-free state, eliminate method and the device of the echo of the other side's receiver |
| CN108028982A (en) * | 2015-09-23 | 2018-05-11 | 三星电子株式会社 | Electronic equipment and its audio-frequency processing method |
| CN105263081A (en) * | 2015-11-16 | 2016-01-20 | 北京祥雍智杰科技有限公司 | Feedback-suppressed earplug device |
| CN105263081B (en) * | 2015-11-16 | 2018-05-01 | 北京祥雍智杰科技有限公司 | It is a kind of that there is the earplug arrangement for suppressing feedback function |
| CN105516859A (en) * | 2015-11-27 | 2016-04-20 | 深圳Tcl数字技术有限公司 | Method and system for eliminating echo |
| CN105516859B (en) * | 2015-11-27 | 2019-04-16 | 深圳Tcl数字技术有限公司 | Eliminate the method and system of echo |
| US10360923B2 (en) | 2015-11-27 | 2019-07-23 | Shenzhen Tcl Digital Technology Ltd. | Method and system for eliminating an echo |
| CN106569774A (en) * | 2016-11-11 | 2017-04-19 | 青岛海信移动通信技术股份有限公司 | Method of eliminating noise, and terminal |
| CN106569774B (en) * | 2016-11-11 | 2020-07-10 | 青岛海信移动通信技术股份有限公司 | Method and terminal for removing noise |
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Application publication date: 20130626 |