CN1094280C - Method for detecting squelch of IP telephone - Google Patents
Method for detecting squelch of IP telephone Download PDFInfo
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- CN1094280C CN1094280C CN 98118363 CN98118363A CN1094280C CN 1094280 C CN1094280 C CN 1094280C CN 98118363 CN98118363 CN 98118363 CN 98118363 A CN98118363 A CN 98118363A CN 1094280 C CN1094280 C CN 1094280C
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Abstract
The present invention relates to a method for detecting mute sound of network telephones. The present invention comprises the following steps: when the voice data of the current frame is gathered, the vibration amplitude value is calculated, and short-time average energy is obtained; when the short-time average energy exceeds the critical value of speech energy, which shows that the speech is detected; the short-time average energy of the current frame passes through a low-pass filter to obtain and detect the long-time average energy of the current frame; when the long-time average energy of consecutive number of frames is below the critical value of mute sound energy, the mute sound is detected; then, the voice data of the current frame is regathered, and the number of converting times of plus signs and minus signs of adjacent data is calculated; when once the zero cross rate exceeds the critical value, which is judged to detect noise.
Description
Technical field
The present invention relates to the mute detection method in a kind of networking telephone.
Said mute detection method is meant in the networking telephone by each test section in the silence detection module, correct separation voice and background noise, with the redundant voice data of filtering, thereby can in limited network bandwidth, obtain best communication effect, in addition, when detecting when not transmitting speech data, promptly can transmit quiet frame (frame) data, these quiet frame data can be saved transmitting bandwidth than speech data, simultaneously, when recipient one receives quiet frame data, also can the playback background noise, and can keep speaking synchronously, secondly, semiduplex theory listen be provided with in the pattern one the conversion module, during speech data on receiving network, can convert answer mode automatically to, when this locality detects voice, then convert pattern in a minute automatically to, and be provided with button, make things convenient for the user can both speak at any time.
Background technology
The general networking phone belongs to instant communicating system, but be subjected to the restriction of the network bandwidth, must under the prerequisite of not destroying speech quality, reduce transfer of data as far as possible, in addition, if the user has used semiduplex sound blaster, just can not speak simultaneously and answer, and can only say/listen that pattern realizes talk indirectly by conversion, in view of above two large problems, people begin to use for reference the quietness technology in the voice-sound identification field, come filtering redundant voice data with this, and the automatic conversion of pattern is said/is listened in the realization half-duplex.
But quietness technology still has following shortcoming just as a kind of supplementary means:
1. it is quiet simply to adopt the short-time average energy detection to have or not, poor to the adaptive capacity of environment;
2. simple filtering quiet data and do not do any processing may cause the asynchronism of talk;
3. pattern is changed/is listened in half-duplex automatically, has ignored interviewer's initiative.
Therefore, for improving the shortcoming in the above-mentioned conventional techniques, the invention provides the mute detection method in a kind of networking telephone.
Summary of the invention
Purpose of the present invention is to provide the mute detection method in a kind of networking telephone, mainly is each test section of passing through on the networking telephone in the silence detection module, correctly separates voice and background noise, with the redundant voice data of filtering.
For realizing described purpose, the invention provides the mute detection method in a kind of networking telephone, this method is undertaken by the silence detection module, each test section in this silence detection module includes speech detection, silence detection and noise measuring etc., the step of described mute detection method is as follows, at first, when the voice data collected when former frame, by asking its amplitude and obtaining short-time average energy, when in case short-time average energy surpasses the critical value of speech energy, i.e. representative detects voice, secondly, the short-time average energy that to work as former frame passes through low pass filter again, average energy and detecting when obtaining this frame long, when average energy all is lower than the critical value of quiet energy when consecutive numbers frame long, promptly detect quiet, afterwards, regather voice data when former frame, calculate adjacent data its just, the number of transitions of minus symbol, (being zero-crossing rate) is in case when zero-crossing rate surpasses critical value, promptly judge to detect noise, therefore isolate voice and background noise by these three kinds of detections, thereby can in limited network bandwidth, obtain best communication effect.
Mute detection method in the networking telephone provided by the present invention, wherein, when sender's silence detection system detects the sender and does not transmit speech data, can transmit quiet frame data simultaneously, these quiet frame data can be saved transmitting bandwidth than speech data, simultaneously, when the recipient receives quiet frame data, therefore the recipient also can transmit local background noise to the sender,, the retardance that both sides can not transmit because of network, and nonsynchronous sensation of talk is arranged.
Mute detection method in the networking telephone provided by the present invention, wherein, semiduplex theory listen have in the pattern one the conversion module, during speech data on receiving network, can convert answer mode automatically to, when this locality detects voice, then convert pattern in a minute automatically to, and be provided with function key, make things convenient for the user can both speak at any time.
Description of drawings
For further being familiar with and understanding purpose of the present invention, shape constructing apparatus feature and effect thereof, more in conjunction with the accompanying drawings, be described in detail as follows for embodiment:
Fig. 1 is a hardware configuration schematic diagram of the present invention.
Fig. 2 is the hardware configuration calcspar of full duplex quietness technology of the present invention.
Fig. 3 is the hardware configuration calcspar of half-duplex quietness technology of the present invention.
Fig. 4 is the hardware structure diagram of the quiet module of full duplex recording end of the present invention.
Fig. 5 is full duplex recording flow chart of data processing figure of the present invention.
Fig. 6 is the hardware structure diagram of the quiet module of half-duplex recording end of the present invention.
Fig. 7 is half-duplex recording flow chart of data processing figure of the present invention.
Fig. 8 is a speech detection flow chart of the present invention.
Fig. 9 is a silence detection flow chart of the present invention.
Figure 10 is a noise measuring flow chart of the present invention.
Figure 11 is the hardware structure diagram of the quiet module of full duplex playback end of the present invention.
Figure 12 is full duplex playback flow chart of data processing figure of the present invention.
Figure 13 is the hardware structure diagram of the quiet module of half-duplex playback end of the present invention.
Figure 14 is half-duplex playback flow chart of data processing figure of the present invention.
Figure 15 A-15B is the present invention's end general flow chart of recording.
Figure 16 is a playback end general flow chart of the present invention.
Embodiment
With reference to shown in Figure 1, the present invention is a kind of " mute detection method in the networking telephone ", it includes a PC 11, sound blaster 12, microphone 13, loud speaker 14, modem or network card 15 etc., wherein, microphone 13 is that the voice signal that will be recorded changes into the signal of telecommunication and inputs in the sound blaster 12, loud speaker 14 becomes voice signal to broadcast away the electrical signal conversion that sound blaster 12 is exported again, with reference to Fig. 2, shown in Figure 3, the regular phone call mode includes full-duplex mode (as shown in Figure 2) and semiduplex mode (as shown in Figure 3), so-called full-duplex mode is meant that both call sides can be said simultaneously and listens, be meant in network phone system as for semiduplex mode, sound blaster is in semiduplex working method, at current time, can only carry out a wherein recording or a tone playing state, and can not record simultaneously or playback, and silence detection technology of the present invention is applicable to full-duplex mode and semiduplex mode.
With reference to Fig. 2, shown in Figure 3, it is the networking telephone transmitted and received voice at full-duplex mode or semiduplex mode a work calcspar, this full-duplex mode and semiduplex mode when transmitting voice, all be earlier via microphone 13 with the voice that are recorded to transfer to respectively mixer 21, mould/number conversion 22, recording application program interface (recording API) 23, the quiet module 24 of recording end, modem or network card 15 again by network with voice transfer to the recipient; And full-duplex mode and semiduplex mode are when receiving voice, all be to receive speech data by network earlier, again with this speech data via modem or network card 15, the quiet module 25 of playback end, receive application program interface (receiving API) 26, D/A switch 27, mixer 21, broadcast away by loud speaker 14 again; Wherein, silence detection technology of the present invention is to be applied in recording quiet module 24 of end and the quiet module 25 of playback end, as for, in semiduplex mode, still include a conversion module 28 in its silence detection technology, to realize saying/listening the automatic of pattern and pressure conversion.
With reference to Fig. 4, shown in Figure 5, be the hardware structure diagram and the flow chart of the quiet module 24 of full duplex recording end, at first, detect the voice data that recording application program interface 23 is sampled earlier, be speech data if detect, then start encoder 31, with encoded speech data, and pressing data selector switch 32 sends coded data to modem or network card 15, otherwise, if detect when being not speech data, promptly close encoder 31, and pressing data selector switch 32 be sent to modem or network card 15 with quiet frame 33 data.
With reference to Fig. 6, shown in Figure 7, be the hardware structure diagram and the flow chart of the quiet module 24 of half-duplex recording end, at first, detect the voice data that recording application program interface 23 is sampled earlier, be speech data if detect, then start encoder 31,, and send modem or network card 15 to encoded speech data, otherwise, if detect when being not speech data, promptly close encoder 31, and testing result is inputed to conversion module 28 to start the conversion of saying/listen pattern.
Hold in the quiet module 24 in above-mentioned full duplex and semiduplex recording, it has a silence detection module 34, and the present invention promptly finds out the beginning and the termination of voice from background noise by this silence detection module 34, and the silence detection module includes speech detection, silence detection and noise measuring etc.; With reference to shown in Figure 8, this speech detection is as the start-up portion (beginning of sentence or paragraph) that detects voice, it is to adopt short-time average energy to detect, at first collect voice data N when former frame, this voice data N is asked its amplitude and also passes through filtering in short-term, and obtain the short-time average energy Se ' of this frame, when in case short-time average energy Se ' surpasses the critical value of speech energy Se, i.e. expression detects voice, and all be regarded as speech data from the voice data N that this frame begins, until detect quiet till.4
This speech detection is undertaken by following formula:
At first, calculate the speech energy Se of present frame
N is every frame voice number
Secondly, calculate the zero-crossing rate Sz of present frame
Wherein: sgn[Xin (i)]=1, Xin (i)＞=0
sgn[Xin(I)]＝-1 ， Xin(I)＜0
Then, above-mentioned speech energy obtains short-time average energy Se through behind the filter in short-term,
Se＝0.5Se′+0.5Se
Therefore, when (Se '＞Et) and (during Szmin＜Sz＜Szmax), representing currently has voice signal, and current state is set to state in a minute, and program enters silence detection; Wherein, Et is the speech energy critical value, and Szmin and Szmax are respectively the zero-crossing rate lower limit and the upper limit.
With reference to shown in Figure 9, among the present invention, this silence detection is as quiet (interval between sentence or the paragraph) of detecting the talk gap, because the quiet little and longer duration of energy, average energy detects when therefore adopting length, it is that the short-time average energy Se ' when former frame is passed through low pass filter, and average energy Se ' and detecting when obtaining this frame long, have only when average energy Ss ' all is lower than the critical Est of quiet energy when consecutive numbers frame long, just expression detects quiet, therefore, all be regarded as background noise from the voice data N of this frame, till detecting voice, then calculate by the dead time of normal talking as for the continuous detecting frame number.
This silence detection is undertaken by following formula:
At first, calculate the speech energy Se of present frame
N is every frame voice number
Secondly, above-mentioned speech energy obtains average energy Ss ' when long when long behind the filter
Ss′＝0.9Ss′+0.1Ss
Then, when (Ss＜Est) is CONUT++ (progression of presentation technology device adds 1) then;
When (Ss＞Est) is CONUT=0 then
I.e. expression detects quiet, and wherein Est is quiet threshold amount of energy, therefore, when CONUT=M, be about to current state and be set to the state of answering, and M is the frame number that quiet need reach.
As for, above-mentioned speech energy critical value and quiet threshold amount of energy are to be obtained by following formula, at first, when the user is silent and quiet, record the mean value Ens of microphone intake earlier, when the user reads aloud one section sentence in a minute, record the mean value Ent of microphone intake, so:
Speech energy critical value Et=Ens+0.5 (Ent-Ens)
Quiet threshold amount of energy Est=Ens+0.2 (Ent-Ens)
Now, during as if each voice data N=320, then pass through theory analysis and experimental result for an embodiment, can obtain speech energy critical value Et=250000, quiet threshold amount of energy Est=100000, and the critical value of zero-crossing rate, its lower limit Szmin=6, upper limit Szmax=36.
Please refer to shown in Figure 10, among the present invention, introduced the zero-crossing rate detection in noise measuring, it is the voice data of collecting earlier when former frame, calculate adjacent data its just, the number of transitions of minus symbol (being zero-crossing rate), when zero-crossing rate is higher than critical value, judge promptly to detect noise that this frame voice data now is considered as background noise equally, now for example explanation how to calculate adjacent data its just, the minus symbol number of transitions, for example: this speech data is: 20,50,100,40,10 ,-30 ,-50,-10,10,60,90,50 because, its whole data just, the conversion of minus symbol has only secondary, so its zero-crossing rate is " 2 ", and the zero-crossing rate critical value is to be obtained by statistical property.
Therefore, isolate voice and background noise, just can in limited network bandwidth, obtain best communication effect through above-mentioned these three kinds of detections.
Shown in Figure 15 A-15B, be recording end general flow chart, it combines the quiet module of recording end full duplex, the quiet module of half-duplex and silence detection module.At first use speech detection method to determine the start-up portion of voice, use mute detection method to determine the dwell section of voice then, use the noise that is mingled with in the noise measuring method filtering voice at last, so just obtained " pure " speech data.Under full-duplex mode, speech data is encoded by the network transmission, transmit the synchronism that quiet frame data are coordinated talk in addition.Under semiduplex mode, speech data is encoded by the network transmission, serve as the conversion that pattern was said/listened to sign to have or not speech data simultaneously.
Among the present invention, in the above-mentioned quiet module 24 of full duplex recording end, when detecting the sender and not transmitting speech data, then transmit quiet frame 33 data simultaneously, these quiet frame 33 data can be saved transmitting bandwidth than speech data, therefore when the recipient receives quiet frame data, promptly represent the sender not transmit speech data, the recipient can transmit local background noise to the sender, the retardance that makes both sides can not transmit because of network, and nonsynchronous sensation of talk is arranged; Therefore, shown in Figure 11,12, be the hardware structure diagram and the flow chart of the quiet module 25 of full duplex playback end, at first, this network faces surveys the data that module 35 is responsible Monitoring Data machine or network card 15 receptions, is to be coded data when monitoring, that is during speech data, promptly start decoder 36, and pressing data selector switch 32, decoded speech data is sent to reception application program interface 26; Otherwise if do not monitor coded data, promptly the sender does not transmit speech data, then closes decoder 36, and pressing data selector switch 32, background noise 37 is sent to receive in the application program interface 26.
Shown in Figure 13,14, be the hardware structure diagram and the flow chart of the quiet module 25 of half-duplex playback end, at first, this network monitor module 35 is data of being responsible for Monitoring Data machine or network card 15 receptions, when monitoring coded data, when being speech data, then start decoder 36, and decoded speech data is sent to reception application program interface 26; Otherwise, if do not monitor coded data, promptly do not transmit speech data, then close decoder 36, testing result is inputed to conversion module 28, to trigger the conversion of the pattern of listen/saying.
With reference to shown in Figure 16, be playback end general flow chart, it combines quiet module of playback end full duplex and the quiet module of half-duplex.Quiet module monitors whether receive vocoded data constantly, and under full-duplex mode, by the sound blaster playback, the playback background noise is coordinated the synchronism of talk in addition with vocoded data decoding back; Under semiduplex mode, by the sound blaster playback, serve as that the conversion of pattern is listened/said to sign to have or not vocoded data simultaneously with vocoded data decoding back.
Among the present invention, above-mentioned conversion module 28 is operated under the semiduplex mode, mainly be automatically or force conversion to say/listen pattern, when conversion module 28 starts, if when the quiet module 24 of recording end, when silence detection module 34 detects speech data, keep the pattern of speaking at once, otherwise, then convert answer mode automatically to; And, when network monitor module 35 monitors speech data, keep answer mode at once if when the quiet module 25 of playback end, otherwise, then convert pattern in a minute automatically to, in addition, under answer mode, when pushing a function key 29 as if the user, conversion module 28 forces to convert to the pattern of speaking immediately.
In sum, comprehensive multiple detection can correctly separate voice and background noise, to reduce transfer of data, simultaneously, quiet data is done special processing, to coordinate the synchronism of talk, in addition, make half-duplex say/listen that pattern can change freely, can both speak at any time to make things convenient for the user, so the present invention is a desirable silence detection technology in fact.
The above; only be possible embodiments more of the present invention; but be not in order to limiting protection scope of the present invention, all according to the described content of claims, feature with and spirit and the equivalence of carrying out other variations is implemented, all should be included in protection scope of the present invention.
Claims (11)
1. the mute detection method in the networking telephone is used in the full duplex of the networking telephone and half-duplex call pattern correctly separating voice and background noise by each silence detection, and with the redundant voice data of filtering, described detection method is carried out as follows:
(1) detects the start-up portion of voice, when the voice data collected when former frame, by asking its amplitude and obtain short-time average energy, in case when short-time average energy surpasses the speech energy critical value, i.e. representative detects voice;
(2) detect the quiet of talk gap, to work as the short-time average energy that former frame calculates and pass through low pass filter, average energy and detecting when obtaining this frame long when average energy all is lower than quiet threshold amount of energy when consecutive numbers frame long, promptly detects quiet;
(3) detect the noise in talk gap, collect the voice data when former frame, calculate the number of transitions of its positive and negative symbol of adjacent data, i.e. the number of times of zero-crossing rate is in case when zero-crossing rate surpasses critical value, promptly judge to detect noise.
2. the mute detection method in the networking telephone as claimed in claim 1, wherein, this networking telephone when transmitting voice, earlier via microphone with the voice that are recorded to transfer to respectively mixer, mould/number conversion, recording API promptly record application program interface, the quiet module of recording end, modem or network card again by network with voice transfer to the recipient;
And wherein the quiet module of recording end at first detects the voice data of recording application program interface sampling, according to whether being voice data, determine to start encoder and carry out encoded speech data, still close encoder and the pressing data selector switch is sent to modem with quiet frame data.
3. the mute detection method in the networking telephone as claimed in claim 1, wherein, this networking telephone is when receiving voice, receive speech data by network earlier, again with this speech data via modem or network card, the quiet module of playback end, to receive API be application program interface, D/A switch, mixer, broadcast away by loud speaker again;
And wherein the quiet module of recording end at first network monitor module Monitoring Data machine whether be coded data, according to whether being that coded data starts decoder or closes decoder, if start decoder, then the pressing data selector switch is sent to the application program interface with the decoded speech data, if close decoder, then testing result input conversion module is triggered and listen/say mode switch.
4. the mute detection method in the networking telephone as claimed in claim 1, wherein, this speech detection is to adopt short-time average energy to detect, at first collect voice data N when former frame, this voice data N is asked its amplitude and also passes through filtering in short-term, and obtain the short-time average energy Se ' of this frame, when in case short-time average energy Se ' surpasses speech energy critical value Et, i.e. expression detects voice, and all be regarded as speech data from the voice data N that this frame begins, until detect quiet till.
5. the mute detection method in the networking telephone as claimed in claim 4, wherein, this speech energy critical value is to be obtained by following formula, at first, when the user is silent and quiet, record the mean value Ens of microphone intake earlier, when the user reads aloud one section sentence in a minute, record the mean value Ent of microphone intake, be thereby obtain the speech energy critical value
Et＝Ens+0.5(Ent-Ens)。
6. the mute detection method in the networking telephone as claimed in claim 1, wherein, this silence detection is that average energy detects when adopting length, at first, collect voice data N when former frame, with this voice data N ask its amplitude and and obtain the short-time average energy Se ' of this frame, at this moment, by low pass filter, and average energy Ss ' and detecting when obtaining this frame long is when having only when consecutive numbers frame long average energy Ss ' all to be lower than quiet threshold amount of energy Est with short-time average energy Se ', just expression detects quiet, therefore, all be regarded as background noise from the voice data N of this frame, till detecting voice.
7. the mute detection method in the networking telephone as claimed in claim 6, wherein, this quiet threshold amount of energy is to be obtained by following formula, at first, when the user is silent and quiet, record the mean value Ens of microphone intake earlier, when the user reads aloud one section sentence in a minute, record the mean value Ent of microphone intake, thereby obtain quiet threshold amount of energy
Est＝Ens+0.2(Ent-Ens)。
8. the mute detection method in the networking telephone as claimed in claim 2, wherein, in the quiet module of this full duplex recording end, when detecting the sender and not transmitting speech data, transmit quiet frame data simultaneously, these quiet frame data can be saved transmitting bandwidth than speech data, so when the recipient receives quiet frame data, promptly represent the sender not transmit speech data, the recipient can transmit local background noise to the sender, the retardance that makes both sides can not transmit because of network, and nonsynchronous sensation of talk is arranged.
9. the mute detection method in the networking telephone as claimed in claim 1, wherein, this networking telephone is in semiduplex mode, and it has a conversion module, makes half-duplex say/listen that pattern can change freely, can both speak at any time to make things convenient for the user.
10. the mute detection method in the networking telephone as claimed in claim 9, wherein, when the conversion module starts, if when the quiet module of recording end, when silence detection module one detects speech data, promptly keep the pattern of speaking, otherwise, then convert answer mode automatically to, and, when the network monitor module monitors speech data, promptly keep answer mode if when the quiet module of playback end, otherwise, then convert pattern in a minute automatically to.
11. the mute detection method in the networking telephone as claimed in claim 10, wherein, this conversion module also is provided with a function key, and when under answer mode, during as if user's pressing function key, the conversion module promptly forces to convert to the pattern of speaking.
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| CN 98118363 CN1094280C (en) | 1998-08-17 | 1998-08-17 | Method for detecting squelch of IP telephone |
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| CN 98118363 CN1094280C (en) | 1998-08-17 | 1998-08-17 | Method for detecting squelch of IP telephone |
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| CN1094280C true CN1094280C (en) | 2002-11-13 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1310448C (en) * | 2003-09-10 | 2007-04-11 | 中兴通讯股份有限公司 | A quieting method for time division multiplexing equipment |
| WO2010115359A1 (en) * | 2009-04-10 | 2010-10-14 | Byd Company Limited | Method and device for eliminating background noise |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2002093552A1 (en) * | 2001-05-11 | 2002-11-21 | Koninklijke Philips Electronics N.V. | Estimating signal power in compressed audio |
| CN1979639B (en) * | 2005-12-03 | 2011-07-27 | 鸿富锦精密工业（深圳）有限公司 | Silencing treatment device and method |
| CN101764882A (en) * | 2009-12-31 | 2010-06-30 | 深圳市戴文科技有限公司 | PTT conversation device and method for realizing PTT conversation |
| CN102568473A (en) * | 2011-12-30 | 2012-07-11 | 深圳市车音网科技有限公司 | Method and device for recording voice signals |
| CN104702756A (en) * | 2015-02-10 | 2015-06-10 | 小米科技有限责任公司 | Detecting method and detecting device for soundless call |
| CN106486136A (en) * | 2016-11-18 | 2017-03-08 | 腾讯科技（深圳）有限公司 | A kind of sound identification method, device and voice interactive method |
| CN106710606B (en) * | 2016-12-29 | 2019-11-08 | 百度在线网络技术（北京）有限公司 | Method of speech processing and device based on artificial intelligence |
| EP3818528A1 (en) * | 2018-07-03 | 2021-05-12 | Soclip! | Beat decomposition to facilitate automatic video editing |
| CN110570881B (en) * | 2019-08-05 | 2022-07-22 | 深圳震有科技股份有限公司 | Method, apparatus, device and medium for switching back to voice mode in facsimile transparent transmission mode |
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1998
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1310448C (en) * | 2003-09-10 | 2007-04-11 | 中兴通讯股份有限公司 | A quieting method for time division multiplexing equipment |
| WO2010115359A1 (en) * | 2009-04-10 | 2010-10-14 | Byd Company Limited | Method and device for eliminating background noise |
| CN101859568B (en) * | 2009-04-10 | 2012-05-30 | 比亚迪股份有限公司 | Method and device for eliminating voice background noise |
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