CN101087319A - A method and device for sending and receiving background noise and silence compression system - Google Patents
A method and device for sending and receiving background noise and silence compression system Download PDFInfo
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Abstract
The invention discloses a method and device which can send and receive noise and loudspeaker mute compression system. Based on noise property of background noise, the background noise is divided into different types to build corresponding relationship between noise property and background noise, set different background noise corresponding with different SID expression; sending end ensures the type of current background noise based on noise property of current background noise and corresponding relationship between noise property and background noise; sending end constructs SID frame based on the SID frame structure of current background noise, and sends SID frame constructed. The invention adopts SID frames with different structures to express background noise of different noise property, so, the property of background noise can be expressed precisely, the comfortable background noise combined by decoder and background noise in coder can be matched well, and voice quality combined is improved.
Description
Technical field
The present invention relates to the communication technology, particularly relate to a kind of method and apparatus and silence compression system that sends and receive background noise.
Background technology
In various voice communications, the transmission of voice signal is not continuous, such as, people's sounding is not continuous, therefore the voice signal that is transmitted can be divided into audible signal and no acoustical signal.Various audio signals such as audible signal refers to speak, sounding, no acoustical signal refer to comprise the diversity of settings noise at the signal of sounding gap generation, such as white noise, background brouhaha and quiet etc.
Concerning communicating pair, audible signal is a useful signal, is the carrier of Content of Communication, is that background noise is a unwanted signal and there is not acoustical signal, does not comprise the main information of communication.When communication, what people paid close attention to is useful audible signal, considers the pressure of bandwidth, does not therefore wish to transmit useless background noise, so just can effectively reduce transmission bandwidth.If do not pass background noise but only pass audible signal, will cause the discontinuous of background noise, can make the people who listens to feel very uncomfortable, this sensation can be more obvious under the stronger situation of background noise, makes the voice indigestion sometimes.Therefore, at present, common processing mode is: adopt the silence compression technology in codec, background noise is compressed the back transmission, thereby when saving transmission bandwidth, guarantee coding quality preferably.
Fig. 1 is the system configuration schematic diagram of existing techniques in realizing silence compression.Fig. 2 is the flow chart of prior art transmission and received speech signal.Referring to Fig. 1 and Fig. 2, prior art adopts the process of silence compression technical transmission background noise may further comprise the steps when transmission and received speech signal:
Step 201: at transmitting terminal, for the signal of any frame, speech detector (VAD) is analyzed and is detected this signal, detecting this signal is audible signal or background noise, if audible signal, then execution in step 202, if background noise, then execution in step 203.
Step 202: current signal as speech frame, after by speech coder this speech frame being encoded, is sent to receiving terminal, execution in step 204.
Step 203: as non-speech frame, (DTX) encodes to this non-speech frame by the non-voice encoder with current signal, produces quiet description (SID) frame of describing background noise, and the SID frame that is produced is sent to receiving terminal.
Step 204: at receiving terminal, by Voice decoder the speech frame that receives is decoded, obtaining audible signal is voice signal, and is decoded according to the characteristic parameter that carries in the SID frame that receives by non-voice decoder (CNG), synthetic background noise.
After this, at receiving terminal, then can utilize decoded voice signal and background noise reconstructed speech signal.
At present, when receiving terminal was decoded to non-speech frame, the composition principle of comfortable background noise was identical with the phonetic synthesis principle.The composition principle of voice is: voice s (n) can regard the output that a pumping signal e (n) composite filter v of excitation (n) is produced as, and promptly s (n)=e (n) * v (n) like this, also can use this model when synthesizing background noise.So the characteristic parameter and the vocoder frames of the description background noise that is transmitted in the SID frame are basic identical, comprise composite filter parameter and excitation parameters when signal is synthetic.Because the SID frame delineation is the background noise characteristic, the pumping signal of background noise can be thought simple noise random sequence, and these sequences all can simply produce with the random noise generation module at the encoding and decoding end, control the amplitude of these sequences then with energy parameter, just can produce final pumping signal, therefore when synthetic comfortable background noise, excitation parameters wherein can simply represent with energy parameter, and do not need to further describe with other some characteristic parameters.
When non-speech frame being decoded according to above-mentioned receiving terminal, the composition principle of comfortable background noise, in above-mentioned step 203, when non-speech frame being encoded generation SID frame, the characteristic parameter that carries in this SID frame comprises composite filter parameter and excitation parameters, and wherein, excitation parameters is the energy parameter of current background noise frame, composite filter parameter in the SID frame is identical with voice signal, is line spectral frequencies LSF quantization parameter.Such as, be example with speech coder G.729B, the Bit Allocation in Discrete in its SID frame is as shown in table 1.
| Characteristic parameter is described | Bit number |
| LSF quantitative prediction device index | 1 |
| One-level LSF quantization vector | 5 |
| Secondary LSF quantization vector | 4 |
| Gain (energy) | 5 |
The SID frame Bit Allocation in Discrete of table 1 in G.729B
But, referring to Fig. 1 and Fig. 2, in the prior art, such as speech coder G.729B, in transmission during background noise, employing be single SID frame delineation mode.That is to say, in voice communication system, no matter the current background noise is any characteristic, each encoder only adopts a kind of description and quantization method to represent the characteristic of current background noise, like this, no matter whether the characteristic of background noise is steady, and the structure of describing the SID frame of this background noise all is changeless, the characteristic parameter in the SID frame and identical to the bit number of its quantification.
Yet in the voice communication of reality, what encoder was faced is various occasions, and the background noise characteristic of every kind of occasion is all different.In some comparatively quiet occasions, such as in office, background noise is just comparatively simple, is generally simple white noise and quiet, and its noise characteristic is comparatively steady; And in some more noisy occasions, such as in the street corner, background noise is just comparatively complicated, and as brouhahas such as car sound and voice, its noise characteristic is very not steady.Therefore, prior art the time is not distinguished the characteristic of background noise at coding, and the mode to the characteristic of all background noises all adopts a kind of SID frame to describe then lacks specific aim, can't give expression to the characteristic of diversity of settings noise exactly.Accordingly, when decoding end is synthesized comfortable background noise, the comfortable background noise that is synthesized just can not well mate with the background noise characteristic of coding side, therefore can cause the voice quality of being synthesized relatively poor, what cause people's ear feels very uncomfortable, thereby greatly reduces the QoS of voice communication.
In addition, in the prior art, when transmitting terminal is described the characteristic of background noise, composite filter parameter and excitation parameters have only been considered, that is to say that entrained characteristic parameter has only various quantization parameters and the energy parameter of line spectral frequencies LSF in the SID frame, and do not have other characteristic parameter.Yet, for some complicated background noises comparatively, its noise characteristic is comparatively complicated, there are a lot of specific noise characteristics, only in the SID frame, use various quantization parameters and the energy parameter of line spectral frequencies LSF, often can't express all characteristics of background noise fully, accordingly, when decoding end is synthesized comfortable background noise, the comfortable background noise that is synthesized also just can not mate with the background noise characteristic of coding side fully, therefore can further cause the voice quality of being synthesized poor, what cause people's ear feels very uncomfortable, thereby has further reduced the QoS of voice communication.
Summary of the invention
In view of this, first purpose of the present invention is to provide a kind of method that sends background noise, second purpose of the present invention is to provide a kind of method that receives background noise, the 3rd purpose of the present invention is to provide a kind of device that sends background noise, the 4th purpose of the present invention is to provide a kind of device that receives background noise, the 5th purpose of the present invention is to provide a kind of system that sends and receive background noise, the 6th purpose of the present invention is to provide a kind of silence compression system, so that give expression to the characteristic of different background noise exactly by different SID frames.
In order to achieve the above object, technical scheme of the present invention is achieved in that
A kind of method that sends background noise, according to the noise characteristic of each background noise, each background noise is divided into different classifications, set up the corresponding relation of noise characteristic and background noise classification, and the corresponding different SID frame structure of different background noise classifications is set, this method also comprises:
A, transmitting terminal receive the current background noise, according to the corresponding relation of the noise characteristic of current background noise and noise characteristic of being set up and background noise classification, determine the background noise classification that the current background noise is affiliated;
B, transmitting terminal according to the SID frame structure of definite background noise classification correspondence, structure SID frame, and send the SID frame that is constructed.
Described noise characteristic is: the correlation size between ambient noise signal; Or background noise has or not periodic characteristic.
Described different SID frame structure comprises: between the different SID frames, have identical characteristic parameter, and the quantified precision difference of one or more characteristic parameters;
Or, between the different SID frames, have diverse characteristic parameter;
Or, between the different SID frames, have identical characteristic parameter and different characteristic parameters.
When described different SID frame structure is that described different SID frame structure further comprises: the quantified precision of one or more same characteristic features parameters is identical when having identical characteristic parameter with different characteristic parameter between the different SID frames; Or, the quantified precision difference of one or more same characteristic features parameters.
When comprising in the described different SID frame structure that when taking on a different character parameter between the different SID frames, described different SID frame structure further comprises: comprise newly-installed characteristic parameter in the different characteristic parameters.
In step B, the step of described structure SID frame comprises: transmitting terminal according to the SID frame structure of definite background noise classification correspondence, from the current background noise, extract the characteristic of correspondence parameter, and according to the quantified precision of each characteristic parameter in the SID frame structure of definite background noise classification correspondence, the characteristic parameter that is extracted is quantized, utilize the bit number structure SID frame after quantizing then.
This method further comprises: transmitting terminal adopts uniformly-spaced mode or unequal interval mode to send a plurality of SID frames with different frame structure.
This method further comprises: the corresponding different noise generation rule of different background noise class is set; After receiving terminal receives the SID frame, determine the background noise classification of this SID frame correspondence, and according to the noise generation rule of definite background noise classification correspondence, produce the current background noise.
A kind of method that receives background noise, this method comprises: according to the noise characteristic of each background noise, each background noise is divided into different classifications, and the corresponding different noise generation rule of different background noise class is set; After receiving terminal receives the SID frame, determine the background noise classification of this SID frame correspondence, and, produce the current background noise according to the noise generation rule of determined background noise classification correspondence.
A kind of device that sends background noise, this device comprises: noise classification unit and a plurality of noise code unit, wherein, preserve the different classes of pairing different SID frame structures of background noise in the different noise code unit, and,
The noise classification unit, be used to receive the current background noise, and according to the corresponding relation of the noise characteristic of current background noise and noise characteristic of being preserved and background noise classification, determine the background noise classification that the current background noise is affiliated, according to the corresponding relation of the background noise classification under the determined current background noise and background noise classification of being preserved and noise code unit, the current background noise is sent to corresponding noise code unit;
Any one noise code unit is used for when receiving the current background noise, according to the SID frame structure of being preserved, and the SID frame of structure description current background noise, and send the SID frame of being constructed.
A kind of device that receives background noise, this device comprises: a plurality of noise decoding units, wherein, preserve the different noise generation rules of different background noise class correspondence in the different noise decoding units,
Any one noise decoding unit is used for when receiving the SID frame, according to noise generation rule of being preserved and received SID frame, produces the current background noise.
A kind of system that sends and receive background noise, this system comprises: noise classification unit, a plurality of noise code unit and a plurality of noise decoding unit, wherein, different noise code are preserved the different classes of pairing different SID frame structures of background noise in the unit, preserve the different noise generation rules of different background noise class correspondence in the different noise decoding units, and
The noise classification unit, be used to receive the current background noise, and according to the corresponding relation of the noise characteristic of current background noise and noise characteristic of being preserved and background noise classification, determine the background noise classification that the current background noise is affiliated, according to the corresponding relation of determined background noise classification and background noise classification of being preserved and noise code unit, the current background noise is sent to corresponding noise code unit;
Any one noise code unit is used for when receiving the current background noise, according to the SID frame structure of being preserved, and the SID frame of structure description current background noise, and send the SID frame of being constructed;
Any one noise decoding unit is used for when receiving the SID frame, according to noise generation rule of being preserved and received SID frame, produces the current background noise.
A kind of silence compression system, this system comprises: transmitting terminal and receiving terminal, wherein,
Transmitting terminal comprises, speech detector, speech coder and non-voice encoder comprise noise classification unit and a plurality of noise code unit in the non-voice encoder, and,
Speech detector, detecting this signal frame when receiving signal frame is speech frame or background noise, after detecting to speech frame, this speech frame is sent to speech coder encodes, by the speech frame behind the speech coder transmission coding, when detecting, current background noise is sent to noise classification unit in the non-voice encoder to background noise; The noise classification unit is according to the corresponding relation of the noise characteristic of current background noise and noise characteristic of being preserved and background noise classification, determine the background noise classification that the current background noise is affiliated, according to the corresponding relation of determined background noise classification and background noise classification of being preserved and noise code unit, the current background noise is sent to corresponding noise code unit; The noise code unit when receiving the current background noise, according to the SID frame structure of being preserved, the SID frame of structure description current background noise, and send the SID frame constructed;
Receiving terminal comprises, Voice decoder and non-voice decoder comprise a plurality of noise decoding units in the non-voice decoder, and,
Voice decoder is used to receive speech frame, and this speech frame is decoded;
Any one noise decoding unit is used for when receiving the SID frame, according to noise generation rule of being preserved and received SID frame, produces the current background noise.
This shows, in the present invention, distinguished the characteristic of background noise,, adopt the SID frame of different structure to describe respectively, therefore, can give expression to the characteristic of diversity of settings noise exactly promptly in the different noise characteristics of transmitting terminal according to the different background noise.Accordingly, when decoding end was synthesized comfortable background noise, the comfortable background noise that is synthesized just can well mate with the background noise characteristic of coding side, made that the voice quality of being synthesized is higher, the sensation of people's ear is also very comfortable, thereby has improved the QoS of voice communication greatly.
In addition, in the present invention, not only in the SID frame, use various quantization parameters and the energy parameter of line spectral frequencies LSF, but also can be at the specific noise characteristic of some background noises, be provided with the noise characteristic that new characteristic parameter represents that these are specific, therefore, can express all characteristics of background noise fully, accordingly, when decoding end is synthesized comfortable background noise, the comfortable background noise that is synthesized then can mate fully with the background noise characteristic of coding side, has therefore further improved the voice quality of being synthesized, thereby has further improved the QoS of voice communication.
Description of drawings
Fig. 1 is the system configuration schematic diagram of existing techniques in realizing silence compression.
Fig. 2 is the flow chart of prior art transmission and received speech signal.
Fig. 3 is the structural representation of silence compression system in the present invention.
Fig. 4 is the flow chart that sends and receive background noise in embodiments of the present invention.
Embodiment
In order to make the SID frame describe out the characteristic of background noise accurately, thereby make synthetic audio quality better, the encoder that then must break through transmitting terminal in the prior art is the diversity of settings noise for all non-speech frame, all adopts a kind of restriction of SID frame.That is to say, in an encoder, when the background noise characteristic is described, can be according to the different qualities of background noise, such as being simple white noise or quiet, still comparatively complicated street corner brouhaha etc., and adopt the SID frame of multiple structure that the background noise that these have different qualities is described respectively.
Therefore, the present invention proposes a kind of method that sends background noise, its core concept is: according to the noise characteristic of each background noise, each background noise is divided into different classifications in advance, and the corresponding different SID frame structure of different classes of background noise is set; Transmitting terminal is detecting current signal frame when being background noise, determines the classification under the current background noise; Transmitting terminal is constructed the SID frame according to the SID frame structure of classification correspondence under the current background noise, and sends the SID frame that is constructed.
Corresponding, the invention allows for a kind of method that receives background noise, its core concept is: according to the noise characteristic of each background noise, each background noise is divided into different classifications, and the corresponding different noise generation rule of different background noise class is set; After receiving terminal receives the SID frame, determine the background noise classification of this SID frame correspondence, and, produce the current background noise according to the noise generation rule of determined background noise classification correspondence.
Corresponding, the invention allows for a kind of silence compression system.Fig. 3 is the structural representation of silence compression system in the present invention.Referring to Fig. 3, silence compression system proposed by the invention comprises transmitting terminal and receiving terminal.Wherein, transmitting terminal comprises, speech detector (VAD), speech coder and non-voice encoder (DTX); Receiving terminal comprises, Voice decoder and non-voice decoder (CNG).Wherein, the non-voice encoder (DTX) of transmitting terminal is the device of realizing sending background noise among the present invention, and its inside comprises noise classification unit and a plurality of noise code unit; And, at the non-voice decoder (CNG) of receiving terminal, being the device of realizing receiving background noise among the present invention, its inside comprises a plurality of noise decoding units.
Referring to Fig. 3, in silence compression system of the present invention, speech detector links to each other with noise classification unit in the non-voice encoder with speech coder respectively, and the noise classification unit in the non-voice encoder links to each other with each noise code unit respectively; And speech coder links to each other with Voice decoder by communication channel, and the noise code unit of corresponding same background noise class links to each other with the noise decoding unit.
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with drawings and the specific embodiments.
Fig. 4 is the flow chart that sends and receive background noise in embodiments of the present invention.Referring to Fig. 3 and Fig. 4, in the present invention, realize that the process that sends and receive background noise may further comprise the steps:
Step 401: according to the noise characteristic of each background noise, each background noise is divided into different classifications in advance, and sets up the corresponding relation of each noise characteristic and background noise classification, the corresponding relation of being set up is kept in the noise classification unit.
Here, when the dividing background noise class, the noise characteristic of each background noise of institute's basis can be the size of correlation between each ambient noise signal, and the size of correlation can utilize correlation function to obtain between each ambient noise signal.Such as, correlation between signal is divided into the first kind greater than all background noises of 0.5, correlation between signal is divided into second class less than all background noises of 0.5.Like this, the corresponding relation of being set up can for, correlation is greater than 0.5 corresponding first kind background noise in the noise characteristic, correlation is less than 0.5 the correspondence second class background noise.
Perhaps, when the dividing background noise class, the noise characteristic of each background noise of institute's basis can also be to have or not periodic characteristic in each background noise.Such as, will there be all background noises of periodic characteristic to be divided into the first kind in the signal, be not divided into second class with having in the signal between all background noises of periodic characteristic.Like this, the corresponding relation of being set up can for, signal has the corresponding first kind background noise of periodic characteristic in the noise characteristic, signal does not have the correspondence second class background noise of periodic characteristic in the noise characteristic.
In this step, the classification of the background noise of being divided can comprise two classes or multiclass more.
Step 402: in advance according to the noise characteristic of all kinds of background noises, the corresponding different SID frame structure of different background noise classifications is set, set different SID frame structures are kept at respectively in the different noise code unit.
Here, described different SID frame structure can be following multiple mode:
Between mode A, the different SID frame, have identical characteristic parameter, but the quantified precision difference of one or more characteristic parameters.
Here, in the pairing SID frame of each classification background noise, though adopt identical background noise characteristic parameter, one or more quantified precision difference in these same background noise characteristic parameters, therefore, SID frame structure difference.
Between mode B, the different SID frame, have diverse characteristic parameter, therefore, SID frame structure difference.
Between mode C, the different SID frame, have identical characteristic parameter and different characteristic parameters, therefore, SID frame structure difference.
In mode C, between different SID frames, the quantified precision of one or more same characteristic features parameters can be identical or different.
In the present invention, in order intactly to give expression to the characteristic of background noise, also can new characteristic parameter be set for some specific noise characteristics of background noise, therefore, in aforesaid way B and mode C, the different characteristic parameter that is had between the different SID frames not only can be existing different characteristic parameter, also can be to comprise unexistent, newly-installed characteristic parameter in other SID frames in the SID frame.
Step 403: set in advance the corresponding different noise generation rule of different background noise class, set different noise generation rules are kept at respectively in the different noise decoding units.
Here, because in above-mentioned steps 402, be provided with different SID frame structures at different background noise classifications, therefore, in this step, the corresponding different noise generation rule of different background noise class is set, thereby makes in subsequent process, can decode background noise exactly at the SID frame structure of different background noise.
Step 404: when needs send voice signal, at transmitting terminal, signal for any frame, speech detector (VAD) is analyzed and is detected this signal, detecting this signal is audible signal or background noise, if audible signal, then execution in step 405, if background noise, then execution in step 408.
Step 405: speech detector as speech frame, is transferred to speech coder with current signal.
Step 406: speech coder is encoded to the speech frame that receives, and the speech frame after will encoding by communication channel sends to the Voice decoder of receiving terminal.
Step 407: at receiving terminal, Voice decoder is decoded to the speech frame that receives, and obtains original audible signal, finishes current flow process.
Step 408: as non-speech frame, promptly background noise is transferred to the non-voice encoder to speech detector with current signal.
Step 409: the noise classification unit in the non-voice encoder receives the current background noise, according to the corresponding relation of noise characteristic and each noise characteristic of being preserved and the background noise classification of current background noise, determine the background noise classification under the current background noise.
Here, such as, in step 401, the noise characteristic of institute's basis is the correlation size between signal, so, in this step, the noise characteristic of noise classification unit institute basis is a correlation size between the signal of current background noise.Wherein, the noise classification unit can utilize correlation function to obtain correlation size between the signal of current background noise.
Step 410: the noise classification unit is sent to corresponding noise code unit according to determined background noise classification and background noise classification of preserving in advance and the corresponding relation between the noise code unit with the current background noise.
Here, such as, classification under the determined current background noise is 1 class, and there are corresponding relation in noise code unit 1 and 1 class background noise, promptly should be responsible for 1 class background noise is encoded by noise code unit 1, then in this step, the current background noise is sent to noise code unit 1.
Step 411: this corresponding noise code unit receives the current background noise, according to the SID frame structure of preserving in advance, the SID frame of structure description current background noise.
Here, the process of the SID frame of described structure description current background noise comprises: this corresponding noise code unit is according to the SID frame structure of classification correspondence under the current background noise, it is the SID frame structure of preserving in self, from the current background noise, extract the characteristic of correspondence parameter, and in the SID frame structure according to classification correspondence under the current background noise, be in the SID frame structure of self preserving, the quantified precision of each characteristic parameter, the characteristic parameter that is extracted is quantized, utilize the bit number structure SID frame after quantizing then.
Step 412: this corresponding noise code unit is sent to the SID frame that is constructed, describe the current background noise the corresponding noise decoding unit of receiving terminal by communication channel.
Here, the noise decoding unit of described corresponding noise decoding unit for being responsible for the SID frame of classification correspondence under the current background noise is decoded.
Step 413: at receiving terminal, this correspondence noise decoding unit is decoded to received SID frame according to the noise generation rule of being preserved, and produces the current background noise.
After this, at receiving terminal, then can utilize decoded voice signal and background noise reconstructed speech signal.
Need to prove that in the present invention, described voice signal not only comprises the voice signal the when people converses, but also comprise other various forms of audio signals.That is to say that the technical scheme of background noise is transmitted in the present invention, not only can be when the people converses use during the transporting speech signal, but also can when other audio signals of transmission, use.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1, a kind of method that sends background noise, it is characterized in that, noise characteristic according to each background noise, each background noise is divided into different classifications, set up the corresponding relation of noise characteristic and background noise classification, and the corresponding different quiet description SID frame structure of different background noise classifications is set, this method also comprises:
A, transmitting terminal receive the current background noise, according to the corresponding relation of the noise characteristic of current background noise and noise characteristic of being set up and background noise classification, determine the background noise classification that the current background noise is affiliated;
B, transmitting terminal according to the SID frame structure of definite background noise classification correspondence, structure SID frame, and send the SID frame that is constructed.
2, method according to claim 1 is characterized in that, described noise characteristic is: the correlation size between ambient noise signal; Or background noise has or not periodic characteristic.
3, method according to claim 1 is characterized in that, described different SID frame structure comprises: between the different SID frames, have identical characteristic parameter, and the quantified precision difference of one or more characteristic parameters;
Or, between the different SID frames, have diverse characteristic parameter;
Or, between the different SID frames, have identical characteristic parameter and different characteristic parameters.
4, method according to claim 3, it is characterized in that, when described different SID frame structure is that described different SID frame structure further comprises: the quantified precision of one or more same characteristic features parameters is identical when having identical characteristic parameter with different characteristic parameter between the different SID frames; Or, the quantified precision difference of one or more same characteristic features parameters.
5, according to claim 3 or 4 described methods, it is characterized in that, when comprising in the described different SID frame structure that when taking on a different character parameter between the different SID frames, described different SID frame structure further comprises: comprise newly-installed characteristic parameter in the different characteristic parameters.
6, method according to claim 1, it is characterized in that, in step B, the step of described structure SID frame comprises: transmitting terminal according to the SID frame structure of definite background noise classification correspondence, from the current background noise, extract the characteristic of correspondence parameter, and according to the quantified precision of each characteristic parameter in the SID frame structure of definite background noise classification correspondence, the characteristic parameter that is extracted is quantized, utilize the bit number structure SID frame after quantizing then.
7, method according to claim 1 is characterized in that, this method further comprises: transmitting terminal adopts uniformly-spaced mode or unequal interval mode to send a plurality of SID frames with different frame structure.
8, method according to claim 1 is characterized in that, this method further comprises: the corresponding different noise generation rule of different background noise class is set; After receiving terminal receives the SID frame, determine the background noise classification of this SID frame correspondence, and according to the noise generation rule of definite background noise classification correspondence, produce the current background noise.
9, a kind of method that receives background noise is characterized in that, this method comprises: according to the noise characteristic of each background noise, each background noise is divided into different classifications, and the corresponding different noise generation rule of different background noise class is set; After receiving terminal receives the SID frame, determine the background noise classification of this SID frame correspondence, and, produce the current background noise according to the noise generation rule of determined background noise classification correspondence.
10, a kind of device that sends background noise is characterized in that, this device comprises: noise classification unit and a plurality of noise code unit, wherein, preserve the different classes of pairing different SID frame structures of background noise in the different noise code unit, and,
The noise classification unit, be used to receive the current background noise, and according to the corresponding relation of the noise characteristic of current background noise and noise characteristic of being preserved and background noise classification, determine the background noise classification that the current background noise is affiliated, according to the corresponding relation of the background noise classification under the determined current background noise and background noise classification of being preserved and noise code unit, the current background noise is sent to corresponding noise code unit;
Any one noise code unit is used for when receiving the current background noise, according to the SID frame structure of being preserved, and the SID frame of structure description current background noise, and send the SID frame of being constructed.
11, a kind of device that receives background noise is characterized in that, this device comprises: a plurality of noise decoding units, wherein, preserve the different noise generation rules of different background noise class correspondence in the different noise decoding units,
Any one noise decoding unit is used for when receiving the SID frame, according to noise generation rule of being preserved and received SID frame, produces the current background noise.
12, a kind of system that sends and receive background noise, it is characterized in that, this system comprises: noise classification unit, a plurality of noise code unit and a plurality of noise decoding unit, wherein, different noise code are preserved the different classes of pairing different SID frame structures of background noise in the unit, preserve the different noise generation rules of different background noise class correspondence in the different noise decoding units, and
The noise classification unit, be used to receive the current background noise, and according to the corresponding relation of the noise characteristic of current background noise and noise characteristic of being preserved and background noise classification, determine the background noise classification that the current background noise is affiliated, according to the corresponding relation of determined background noise classification and background noise classification of being preserved and noise code unit, the current background noise is sent to corresponding noise code unit;
Any one noise code unit is used for when receiving the current background noise, according to the SID frame structure of being preserved, and the SID frame of structure description current background noise, and send the SID frame of being constructed;
Any one noise decoding unit is used for when receiving the SID frame, according to noise generation rule of being preserved and received SID frame, produces the current background noise.
13, a kind of silence compression system is characterized in that, this system comprises: transmitting terminal and receiving terminal, wherein,
Transmitting terminal comprises, speech detector, speech coder and non-voice encoder comprise noise classification unit and a plurality of noise code unit in the non-voice encoder, and,
Speech detector, detecting this signal frame when receiving signal frame is speech frame or background noise, after detecting to speech frame, this speech frame is sent to speech coder encodes, by the speech frame behind the speech coder transmission coding, when detecting, current background noise is sent to noise classification unit in the non-voice encoder to background noise; The noise classification unit is according to the corresponding relation of the noise characteristic of current background noise and noise characteristic of being preserved and background noise classification, determine the background noise classification that the current background noise is affiliated, according to the corresponding relation of determined background noise classification and background noise classification of being preserved and noise code unit, the current background noise is sent to corresponding noise code unit; The noise code unit when receiving the current background noise, according to the SID frame structure of being preserved, the SID frame of structure description current background noise, and send the SID frame constructed;
Receiving terminal comprises, Voice decoder and non-voice decoder comprise a plurality of noise decoding units in the non-voice decoder, and,
Voice decoder is used to receive speech frame, and this speech frame is decoded;
Any one noise decoding unit is used for when receiving the SID frame, according to noise generation rule of being preserved and received SID frame, produces the current background noise.
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| CN 200610083533 CN101087319B (en) | 2006-06-05 | 2006-06-05 | A method and device for sending and receiving background noise and silence compression system |
| PCT/CN2007/070063 WO2007140724A1 (en) | 2006-06-05 | 2007-05-29 | A method and apparatus for transmitting and receiving background noise and a silence compressing system |
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| CN 200610083533 CN101087319B (en) | 2006-06-05 | 2006-06-05 | A method and device for sending and receiving background noise and silence compression system |
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| WO2007140724A1 (en) | 2007-12-13 |
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