CN1858845A - System and method for echo suppression of grouped speech - Google Patents
System and method for echo suppression of grouped speech Download PDFInfo
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- CN1858845A CN1858845A CNA2005101024004A CN200510102400A CN1858845A CN 1858845 A CN1858845 A CN 1858845A CN A2005101024004 A CNA2005101024004 A CN A2005101024004A CN 200510102400 A CN200510102400 A CN 200510102400A CN 1858845 A CN1858845 A CN 1858845A
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Abstract
This invention discloses a system and a method for echo suppression to grouped phones, in which, said system includes an A/D convertor, a package module of real time transmission protocol packets, a de-package module of real time transmission protocol packets, a D/A converter, an echo suppression module suppressing the systematic echos, the method includes: judging echo then suppressing it to suppress the echo generated by the grouped phone terminal system effectively to increase the phone quality in communication.
Description
Technical field
The present invention relates to communication field, relate in particular to a kind of system and method that packet voice is carried out the echo inhibition.
Background technology
Packet voice is a kind of speech processes and transmission technology.Make a start voice signal carried out encoding process after, encapsulate with the form of RTP (Real-time Transport Protocol RTP) packet; At receiving end, from the RTP packet that receives, solve vocoded information.
As shown in Figure 1, in session, the voice signal of packet voice terminal to coming from microphone, sample by analog to digital converter, voice coding, carry out RTP, UDP (UserDatagram Protocol User Datagram Protocol), IP a series of encapsulation such as (Internet Protocol Internet Protocols) then, because after finishing the RTP encapsulation, follow-up UDP, IP encapsulate the process that is inevitable, and it is irrelevant with the present invention, so this paper is not to detailed argumentation, and the packet after will encapsulating is dealt on the packet voice terminal of opposite end by physical carrier; For situation about receiving, then be the packet voice terminal by packets such as IP, UDP, RTP are unpacked, recover voice coding.Recovering the voice coding of coming out, is the digital speech information after quantizing, and after digital-to-analog conversion, forms the voice signal of simulation, amplifies again, delivers on the earphone.When the electric isolated effect of packet voice terminal was bad, the audible feedback of coming out from earphone was delivered on the sendaisle to microphone more always, and the opposite end is formed echo interference.Described echo is exactly, the voice signal that the calling party in communication is sent, reach the other side after because isolation effect is not good, sound signal feed-in receiving loop causes calling party to hear the phenomenon of own sound.This phenomenon has been disturbed the normal call of calling party.Sometimes be also referred to as echo.In this article, general designation echo.
Prior art normally adopts the hardware isolated technology that echo is suppressed, and the sending and receiving end of sound is isolated, and avoids echo.But adopt the hardware isolated technology,, then increased hardware cost greatly, and because the frequency of audio frequency is low, isolation effect also is difficult to guarantee owing to outside the packet voice terminal system, increased hardware newly.
Summary of the invention
The objective of the invention is to outside the packet voice terminal system, not increase newly under the situation of hardware, provide a kind of packet voice is carried out the system and method that echo is suppressed, echo is effectively suppressed.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides a kind of system that packet voice is carried out the echo inhibition, comprise that analog to digital converter, RTP seal dress module, RTP parse module, digital to analog converter, described RTP is sealed the dress module and will be carried out RTP from the vocoded data that the analog to digital converter conversion comes and seal dress; Described RTP parse module is separated the RTP bag and is sent to digital to analog converter after contracting out vocoded data, described system also comprises echo inhibition module, seal the signal of dress module reception and the signal that the RTP parse module sends by comparing RTP, the echo of described system is suppressed.
Described echo is suppressed module and is also comprised: echo judge module, echo control module, wherein: the echo judge module, before judgement time postpones the signal of RTP parse module output whether greater than the elapsed time postpone signal that the back RTP seals the input of dress module and loop attenuation value with, if greater than, need carry out the echo inhibition; Otherwise, do not need to carry out the echo inhibition; The echo control module when the judgement of echo judge module needs echo to suppress, is sealed the dress module to RTP and is sent it back acoustic control system signal.
Described RTP is sealed the dress module and is received described echo control signal, and echo carried out echo processing, described echo processing is to filter out the elapsed time to postpone the signal that the back RTP is sealed the input of dress module, and/or the signal that RTP parse module output before the time delay is set and elapsed time postpone the difference that the back RTP seals the signal of dress module input and postpone the signal that back RTP parse module is exported as the elapsed time.
Of the present inventionly packet voice is carried out the system that echo suppresses also comprise: the echo evaluation module, the signal that signal that receives by the comparand weighted-voltage D/A converter and analog to digital converter send obtains the loop time length of delay and the loop attenuation value of echo loop.
The present invention also provides a kind of packet voice is carried out the method that echo is suppressed, may further comprise the steps: A, echo judge module comparison RTP are sealed the signal of dress module reception and the signal that the RTP parse module sends, need to judge whether the echo inhibition, suppress if need, carry out step B, otherwise, continue to judge;
B, echo control module are sealed the dress module to RTP and are sent it back acoustic control system signal;
C, RTP are sealed the dress module and are received described echo control signal, and echo is carried out echo processing.
Being judged as described in the steps A of the present invention: before judgement time postpones the signal of RTP parse module output whether greater than the elapsed time postpone signal that the back RTP seals the input of dress module and loop attenuation value with, if greater than, need carry out the echo inhibition; Otherwise, do not need to carry out the echo inhibition.
Echo processing described in the step C of the present invention is to filter out described elapsed time to postpone the signal that the back RTP is sealed the input of dress module, and/or the signal that RTP parse module output before the described time delay is set and elapsed time postpone the difference that the back RTP seals the signal of dress module input and postpone the signal that back RTP parse module is exported as the elapsed time.
The value of the time delay described in the present invention, promptly loop time length of delay and loop attenuation value obtain by the echo assessment, and described echo assessment specifically comprises:
A1, echo evaluation module transmit control signal, and close RTP and seal dress module and RTP parse module;
A2, echo evaluation module are toward digital to analog converter input digit audio-frequency information;
A3, analog to digital converter receive digitized audio message;
The digitized audio message of A4, more described input and the digitized audio message of described reception draw loop time length of delay and loop attenuation value.
The value of the time delay described in the present invention, promptly loop time length of delay and loop attenuation value manually are provided with by man-machine interface.
When adopting the different grouping voice terminal, start the echo evaluation module, carry out the echo assessment automatically again.
The present invention controls the unlatching that described echo is suppressed module by parameter; When the input of normal audio signal is arranged, close echo and suppress module.
By technical scheme provided by the invention as can be seen, the present invention compares by the audio signal amplitude of transmitting-receiving, has suppressed the echo that the packet voice terminal system produces effectively, has improved the voice quality of communication; The present invention suppresses echo modules such as module and echo evaluation module and is integrated in the existing packet voice terminal system, greatly reduces cost; The present invention is applicable to various forms of packet voice terminals, and when adopting the different grouping voice terminal, as long as start the echo evaluation module, the loop time length of delay of reevaluate automatically loop and loop attenuation value can make the working method of system works in the best; In addition, it is strong that echo of the present invention is suppressed module independence, the opening and closing easily of echo inhibit feature.
Description of drawings
Fig. 1 is the DAB functional diagram that the echoless of background technology suppresses;
Fig. 2 is the DAB functional diagram that has echo to suppress of one embodiment of the invention;
Fig. 3 carries out the process flow diagram of the method for echo inhibition to packet voice for the present invention.
Embodiment
Core concept of the present invention provides a kind of method and system that packet voice is carried out the echo inhibition, compares by the audio signal amplitude of receiving and dispatching, and echo is effectively suppressed.
The invention provides a kind of system that packet voice is carried out the echo inhibition, be illustrated in figure 2 as the Organization Chart of system of the present invention, as shown in Figure 2, system of the present invention comprises: analog to digital converter, RTP are sealed dress module, RTP parse module, digital to analog converter, echo inhibition module, echo evaluation module.
Described analog to digital converter, the sound signal that is used for coming from microphone converts vocoded data to.
Described RTP is sealed dress module (RTP seals the dress module), the vocoded data bag is carried out RTP seal dress.
After finishing the RTP encapsulation, follow-up UDP, IP encapsulate the process that is inevitable, so, here UDP, IP package module are not discussed in detail.
In like manner, IP, UDP parse module are not discussed in detail here.
Described RTP parse module (RTP parse module) unpacks the RTP bag of receiving, extracts vocoded data.
Described digital to analog converter converts vocoded data to sound signal, and sends to earphone.
Described echo is suppressed module and is carried out the echo of the present invention inhibition, and echo inhibit feature module of the present invention comprises: echo judge module, echo control module, wherein:
Before echo judge module, judgement time postpone the signal of RTP parse module output whether greater than the elapsed time postpone signal that the back RTP seals the input of dress module and loop attenuation value and, if greater than, need carry out the echo inhibition; Otherwise, do not need to carry out the echo inhibition;
The echo control module when the judgement of echo judge module needs echo to suppress, is sealed the dress module to described RTP and is sent it back acoustic control system signal.
Described RTP is sealed the dress module and is received described control signal, and echo carried out echo processing, described echo processing is to filter out the elapsed time to postpone the signal that the back RTP is sealed the input of dress module, and/or the signal that RTP parse module output before the time delay is set and elapsed time postpone the difference that the back RTP seals the signal of dress module input and postpone the signal that back RTP parse module is exported as the elapsed time.
System of the present invention also comprises: the echo evaluation module, the signal that signal that receives by the comparand weighted-voltage D/A converter and analog to digital converter send obtains the loop time length of delay and the loop attenuation value of echo loop.The loop time length of delay and the loop attenuation value of described echo loop also can manually be provided with by man-machine interface.
Echo of the present invention is suppressed module and is made on the input port of digital to analog converter.
Echo of the present invention is suppressed module and also can be made on the output port of digital to analog converter, and reduces echo interference by balance module.
Utilize system of the present invention, the present invention also provides a kind of packet voice is carried out the method that echo is suppressed, and with reference to Fig. 3, this method operating process comprises:
Step 10, unlatching echo are suppressed module;
Influence the normal talking of audio packet voice terminal in order to reduce the echo inhibit feature, control the startup that described echo is suppressed module by some parameters that are provided with in the described echo judge module, as: Δ Ht, this parameter is used to be provided with described echo and suppresses the minimum interval that module is closed and started.Close (meaning that generally the packet voice terminal has normal sound signal input) in case echo is suppressed module, then minimum the needs just allows to start echo inhibition module through the time interval of Δ Ht.
Step 11, judge whether to carry out echo and suppress;
Described echo judge module relatively VOICE_IN (the t-Δ T) signal and the preparation of the output of RTP parse module is input to the signal that RTP seals the VOICE_OUT (t) of dress module, if VOICE_IN (t-Δ T)＞VOICE_OUT (t)+Δ D carry out step 12;
Wherein, Δ T is echogenic loop time length of delay, and Δ D is the loop attenuation value of echo loop.Described loop time length of delay Δ T and loop attenuation value Δ D can obtain by described echo evaluation module.Echo being evaluated at carries out carrying out before the regular traffic.This module transmits control signal earlier, closes RTP and seals dress module and RTP parse module, and built-in system is isolated.Then, toward the input end input digit audio-frequency information of digital to analog converter, and receive digitized audio message from the output terminal of analog to digital converter.By the digitized audio message of more described input and the digitized audio message of described reception, obtain the loop time length of delay Δ T and the loop attenuation value Δ D of echo loop.Δ T and Δ D that assessment is come out are set in the echo judge module.
The loop time length of delay Δ T of described echo loop and loop attenuation value Δ D also can carry out manual setting by man-machine interface.
When adopting the different grouping voice terminal, as long as start the echo evaluation module, reevaluate automatically loop time length of delay Δ T and loop attenuation value Δ D can make the working method of system works in the best.
Step 12, described echo control module are sealed the dress module to described RTP and are sent an echo control signal;
Step 13, echo is handled;
Described RTP is sealed the dress module and is received described control signal, and echo carried out echo processing, described echo processing is that described RTP is sealed the signal that the dress module filters out VOICE_OUT (t), and this step is also referred to as quiet processing.
As another embodiment of the present invention, described echo processing also can be adopted the digital time domain equilibrium, and the value of VOICE_IN (t-Δ T)-VOICE_OUT (t) as t voice output value constantly, rather than is directly carried out quiet processing with voice.
Step 14, when the packet voice terminal has normal audio signal when input, close described echo and suppress module.
In sum, the present invention compares by the audio signal amplitude of transmitting-receiving, has suppressed the echo that the packet voice terminal system produces effectively, has improved the voice quality of communication; The present invention suppresses echo modules such as module and echo evaluation module and is integrated in the existing packet voice terminal system, greatly reduces cost; The present invention is applicable to various forms of packet voice terminals, and when adopting the different grouping voice terminal, as long as start the echo evaluation module, the time-delay value Δ T of reevaluate automatically loop and pad value Δ D can make the working method of system works in the best; In addition, it is strong that echo of the present invention is suppressed module independence, the opening and closing easily of echo inhibit feature.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1, a kind of system that packet voice is carried out the echo inhibition, comprise that analog to digital converter, RTP seal dress module, RTP parse module, digital to analog converter, described RTP is sealed the dress module and will be carried out RTP from the vocoded data that the analog to digital converter conversion comes and seal dress; Described RTP parse module is separated the RTP bag and is sent to digital to analog converter after contracting out vocoded data, it is characterized in that: also comprise echo inhibition module, seal the signal of dress module reception and the signal that the RTP parse module sends by comparing RTP, the echo of described system is suppressed.
2, a kind of system that packet voice is carried out the echo inhibition as claimed in claim 1 is characterized in that, described echo is suppressed module and also comprised: echo judge module, echo control module, wherein:
Before echo judge module, judgement time postpone the signal of RTP parse module output whether greater than the elapsed time postpone signal that the back RTP seals the input of dress module and loop attenuation value and, if greater than, need carry out the echo inhibition; Otherwise, do not need to carry out the echo inhibition;
The echo control module when the judgement of echo judge module needs echo to suppress, is sealed the dress module to RTP and is sent it back acoustic control system signal.
3, a kind of system that packet voice is carried out the echo inhibition as claimed in claim 1 or 2, it is characterized in that, described RTP is sealed the dress module and is received described echo control signal, and echo carried out echo processing, described echo processing is to filter out the elapsed time to postpone the signal that the back RTP is sealed the input of dress module, and/or the signal that RTP parse module output before the time delay is set and elapsed time postpone the difference that the back RTP seals the signal of dress module input and postpone the signal that back RTP parse module is exported as the elapsed time.
4, a kind of system that packet voice is carried out the echo inhibition as claimed in claim 1 or 2, it is characterized in that, described system also comprises: the echo evaluation module, the signal that signal that receives by the comparand weighted-voltage D/A converter and analog to digital converter send obtains the loop time length of delay and the loop attenuation value of echo loop.
5, a kind of method that packet voice is carried out the echo inhibition is characterized in that, comprising:
A, echo judge module comparison RTP are sealed the signal of dress module reception and the signal that the RTP parse module sends, and need to judge whether the echo inhibition, if need to suppress, carry out step B, otherwise, continue judgement;
B, echo control module are sealed the dress module to RTP and are sent it back acoustic control system signal;
C, RTP are sealed the dress module and are received described echo control signal, and echo is carried out echo processing.
6, a kind of method of packet voice being carried out the echo inhibition as claimed in claim 5, it is characterized in that, described being judged as: before judgement time postpones the signal of RTP parse module output whether greater than the elapsed time postpone signal that the back RTP seals the input of dress module and loop attenuation value with, if greater than, need carry out the echo inhibition; Otherwise, do not need to carry out the echo inhibition.
7, a kind of method of packet voice being carried out the echo inhibition as claimed in claim 5, it is characterized in that, described echo processing is to filter out described elapsed time to postpone the signal that the back RTP is sealed the input of dress module, and/or the signal that RTP parse module output before the described time delay is set and elapsed time postpone the difference that the back RTP seals the signal of dress module input and postpone the signal that back RTP parse module is exported as the elapsed time.
8, a kind of method that packet voice is carried out the echo inhibition as claimed in claim 6 is characterized in that, the value of described time delay, and promptly loop time length of delay and loop attenuation value obtain by the echo assessment, and described echo assessment specifically comprises:
A1, echo evaluation module transmit control signal, and close RTP and seal dress module and RTP parse module;
A2, echo evaluation module are toward digital to analog converter input digit audio-frequency information;
A3, analog to digital converter receive digitized audio message;
The digitized audio message of A4, more described input and the digitized audio message of described reception draw loop time length of delay and loop attenuation value.
9, a kind of method that packet voice is carried out the echo inhibition as claimed in claim 6 is characterized in that, the value of described time delay, and promptly loop time length of delay and loop attenuation value manually are provided with by man-machine interface.
10, a kind of method that packet voice is carried out the echo inhibition as claimed in claim 8 is characterized in that, when adopting the different grouping voice terminal, starts the echo evaluation module, carries out the echo assessment automatically again.
11, a kind of method that packet voice is carried out the echo inhibition as claimed in claim 5 is characterized in that, controls the unlatching that described echo is suppressed module by parameter; When the input of normal audio signal is arranged, close echo and suppress module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101024004A CN100492494C (en) | 2005-12-08 | 2005-12-08 | System and method for echo suppression of grouped speech |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101024004A CN100492494C (en) | 2005-12-08 | 2005-12-08 | System and method for echo suppression of grouped speech |
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| CN1858845A true CN1858845A (en) | 2006-11-08 |
| CN100492494C CN100492494C (en) | 2009-05-27 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012116646A1 (en) * | 2011-03-01 | 2012-09-07 | 华为技术有限公司 | Method and device for voice enhancement processing |
| WO2014194615A1 (en) * | 2013-06-03 | 2014-12-11 | Tencent Technology (Shenzhen) Company Limited | Systems and methods for echo reduction |
| CN104767895A (en) * | 2014-01-06 | 2015-07-08 | 阿尔卡特朗讯 | Method and equipment for use in packet acoustic echo cancellation |
| US9414162B2 (en) | 2013-06-03 | 2016-08-09 | Tencent Technology (Shenzhen) Company Limited | Systems and methods for echo reduction |
| CN113763978A (en) * | 2021-04-25 | 2021-12-07 | 腾讯科技（深圳）有限公司 | Voice signal processing method, device, electronic equipment and storage medium |
| CN113763978B (en) * | 2021-04-25 | 2024-05-03 | 腾讯科技（深圳）有限公司 | Voice signal processing method, device, electronic equipment and storage medium |
-
2005
- 2005-12-08 CN CNB2005101024004A patent/CN100492494C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012116646A1 (en) * | 2011-03-01 | 2012-09-07 | 华为技术有限公司 | Method and device for voice enhancement processing |
| WO2014194615A1 (en) * | 2013-06-03 | 2014-12-11 | Tencent Technology (Shenzhen) Company Limited | Systems and methods for echo reduction |
| US9414162B2 (en) | 2013-06-03 | 2016-08-09 | Tencent Technology (Shenzhen) Company Limited | Systems and methods for echo reduction |
| CN104767895A (en) * | 2014-01-06 | 2015-07-08 | 阿尔卡特朗讯 | Method and equipment for use in packet acoustic echo cancellation |
| CN104767895B (en) * | 2014-01-06 | 2017-11-03 | 阿尔卡特朗讯 | A kind of method and apparatus for being used to be grouped acoustic echo elimination |
| CN113763978A (en) * | 2021-04-25 | 2021-12-07 | 腾讯科技（深圳）有限公司 | Voice signal processing method, device, electronic equipment and storage medium |
| CN113763978B (en) * | 2021-04-25 | 2024-05-03 | 腾讯科技（深圳）有限公司 | Voice signal processing method, device, electronic equipment and storage medium |
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| Publication number | Publication date |
|---|---|
| CN100492494C (en) | 2009-05-27 |
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Effective date of registration: 20170920 Address after: 071000, No. 2, unit 4, No. 250, sunshine North Avenue, new urban district, Hebei, Baoding, 502 Patentee after: Yin Haimin Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: Huawei Technologies Co., Ltd. |
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