CN100388824C - Decoding method for adaptive multi-rate speech coding in non-consecutive transmitting mode - Google Patents
Decoding method for adaptive multi-rate speech coding in non-consecutive transmitting mode Download PDFInfo
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Abstract
The present invention relates to a decoding method for self-adaptive multi-speed speech coding in a non-consecutive transmitting mode. A threshold valve T is calculated according to SNR output by a demodulator on the receiving end, and the amplitude of soft judge data mode bit IM_D (n) output by the demodulator is limited to be IM_D (n) '; the negative polarity of a decoded frame type recognizing mode IM is polarized to be IM'; one part or the whole of IM_D (n) ' with N bits after amplitude limiting and one part of the whole of the data of the mode IM' corresponding to the frame are calculated to calculate correlation degree R; when the R is negative or equal to T, the frame type output by the demodulator is the same as decoded frame; or else, the frame type output by the demodulator is independent with the frame corresponding to the used mode IM. The frame type of self-adaptive multi-speed voice coding in a continuous transmission mode can be effectively recognized from interfered data in a GSM system by using the decoding method of the present invention.
Description
Technical field
The present invention relates to the communication technology, be specifically related to a kind of in gsm system the interpretation method to the adaptive multi-rate speech coding under the discontinuous transmission standard.
Background technology
Global system for mobile communications (Global system for Mobile communication, be designated hereinafter simply as " GSM ") after it develops into PHASE II, a kind of new voice encoding and decoding mode is provided, be adaptive multi-rate speech coding (Adaptive Muti-Rate speech codec, hereinafter to be referred as " AMR "), the type of service of this speech coding, can dynamically change speech encoding rate and channel coding rate according to wireless environment, the AMR encoder is according to channel type such as full rate or half-rate channel, select in real time a kind of in the various code rate, thereby the optimum combination that reaches speech coding and chnnel coding is to satisfy instantaneous wireless channel conditions and local capacity requirement.AMR provides 8 kinds of code rate selection from 4.75kbits/s to 12.2kbits/s.For general speech frame, there is convolutional encoding to realize FEC (forward error correction).And when discontinuous transmission standard (discontinuous transmission is hereinafter to be referred as DTX), some special frame does not have FEC, how these frames are deciphered, do not have associated description in the agreement, therefore, just can't in DTX, realize decoding yet AMR.
According to gsm protocol, do not have FEC among the AMR but need the special frame of identification to have 9 kinds: full rate SID_UPDATE, full rate SID_FIRST frame, full rate ON_SET frame, half rate SID_UPDATE frame, half rate SID_UPDATE_INH frame, half rate SID_FIRST_P1, half rate SID_FIRST_P2 frame, half rate SID_FIRST_INH frame, half rate ONSET frame.When sending these DTX frames of above-mentioned 9 kinds of full rates, half rate, it is as shown in the table to comprise an IM (recognition mode).
| Frame type | Recognition mode (IM) |
| Full rate SID_UPDATE | 0,1,0,0,1,1,1,1,0 is repeated to 212 bits |
| Full rate SID_FIRST frame | 0,1,0,0,1,1,1,1,0 is repeated to 212 bits |
| Full rate ON_SET frame | Ic1 is repeated to 228bit |
| Half rate SID_UPDATE frame | 1,0,1,1,0,0,0,0,1 is repeated to 212 bits |
| Half rate SID_UPDATE_INH frame | 0,1,0,0,1,1,1,1,0 is repeated to 212bit |
| Half rate SID_FIRST_P1 | 0,1,0,0,1,1,1,1,0 is repeated to 212 bits |
| Half rate SID_FIRST_P2 frame | Ic is repeated to 114 bits |
| Half rate SID_FIRST_INH frame | 1,0,1,1,0,0,0,0,1 is repeated to 212 bits |
| Half rate ONSET frame | Ic1 is repeated to 114bit |
Because the cause of coding is actual in decoding, for SID_UPDATE_INH, SID_FIRST_INH, its recognition mode has become 1,1,1,0,0,1,0,1,1,0,0,0,1,1,0,1,0,0 and 0,0,0,1,1,0,1,0,0,1,1,1,0,0,1,0,1,1; Ic in the table and ic1 are meant one of 4 kinds of following 16bit patterns, are expressed as respectively with the recognition mode of 16 systems with 4 kinds 16: 0x530f, 0x3eb8,0x8863,0xe5d4, for example 0x530f represents that recognition mode is 0,1,0,1,0,0,1,1,0,0,0,0,1,1,1,1, the frame that ic and ic1 represent in the his-and-hers watches need carry out 4 couplings and look for maximum.No matter adopt which kind of pattern, the technical problem that is faced is the same, all needs from being identified original data format the data of noise jamming.Prior art does not provide the solution to the identification or the decoding of these frame types.
Summary of the invention
The type how the technical problem to be solved in the present invention is to go out from the data decoding of receiving terminal demodulator output the frame of the actual transmission of transmit leg is any of following frame type: full rate SID_UPDATE, full rate SID_FIRST frame, full rate ON_SET frame, half rate SID_UPDATE frame, half rate SID_UPDATE_INH frame, half rate SID_FIRST_P1, half rate SID_FIRST_P2 frame, half rate SID_FIRST_INH frame, half rate ONSET frame.In other words, the purpose of this invention is to provide a kind of interpretation method to the adaptive multi-rate speech coding under the discontinuous transmission standard.
The above-mentioned technical problem of the present invention solves like this, constructs a kind of interpretation method to the adaptive multi-rate speech coding under the discontinuous transmission standard, may further comprise the steps:
A1) according to the signal to noise ratio snr of receiving terminal demodulator output, calculate threshold T;
A2) soft-decision data mode bit IM_D (n) amplitude limit of demodulator being exported according to described signal to noise ratio snr is IM_D (n) ';
A3) negative polarity among the recognition mode IM of frame type to be decoded is turned to IM ';
A4) part or all of the data of part or all and the IM ' of the IM_D that contains N bit (n) ' behind the amplitude limit carried out related operation, calculate degree of correlation R;
A5) if R＞=T determines that then the frame type of demodulator output has identical type with frame to be decoded; Otherwise the recognition mode IM ' with another negative polarity processing gets back to steps A 4), have nothing to do up to the frame frame type corresponding that whole recognition modes all calculated and degree of correlation R exports less than the then definite demodulator of threshold T with used pattern IM.
Wherein, the recognition mode IM negative polarity of frame type to be decoded being turned to IM ', is each bit of forming IM to be carried out bit " 0 " become the conversion that " 1 ", " 1 " become " 1 ", obtains negative polarity recognition mode IM '.
Wherein, the signal to noise ratio snr calculating threshold T according to the output of receiving terminal demodulator may further comprise the steps:
1) the reliability p of calculating SNR correspondence
p＝10
SNR/20/17
2) the reliability p that calculates is carried out amplitude limit, promptly surpass at 0.25 o'clock and get 0.25;
3) the figure place N according to reliability p and IM_D (n) calculates thresholding T=N*p*127.
Wherein, soft-decision data mode bit IM_D (n) amplitude limit of demodulator being exported according to described signal to noise ratio snr is IM_D (n) ', may further comprise the steps:
1) peak that the permission amplitude is set is shaken Δ=p*128;
2) if IM_D (n)＞128+ Δ is adjusted IM_D (n) '=128+ Δ;
3) if IM_D (n)＜128-Δ is adjusted IM_D (n) '=128-Δ, wherein p is the reliability of SNR correspondence.
Wherein, described related operation is multiplying.
In said method, the corresponding relation with signal to noise ratio snr and threshold T calculates and is stored in the table in advance, searches this table by SNR at every turn and obtains threshold T.
In said method, described type identification pattern comprises following nine kinds:
1) recognition mode of full rate SID_UPDATE frame is 0,1,0,0,1,1,1,1, and 0 is repeated to 212 bits;
2) recognition mode of full rate SID_FIRST frame is 0,1,0,0,1,1,1,1, and 0 is repeated to 212 bits;
3) full rate ON_SET frame has four kinds of recognition modes, is repeated to 228 bits by 0x530f, 0x3eb8,0x8863 or 0xe5d4 respectively and forms;
4) recognition mode of half rate SID_UPDATE frame is 1,0,1,1,0,0,0,0, and 1 is repeated to 212 bits;
5) recognition mode of half rate SID_UPDATE_INH frame is 0,1,0,0,1,1,1,1, and 0 is repeated to 212 bits;
6) recognition mode of half rate SID_FIRST_P1 frame is 0,1,0,0,1,1,1,1, and 0 is repeated to 212 bits;
7) half rate SID_FIRST_P2 frame has four kinds of recognition modes, is repeated to 114 bits by 0x530f, 0x3eb8,0x8863 or 0xe5d4 respectively and forms;
8) recognition mode of half rate SID_FIRST_INH frame is 1,0,1,1,0,0,0,0, and 1 is repeated to 212 bits;
9) half rate ONSET frame has four kinds of recognition modes, is repeated to 114 bits by 0x530f, 0x3eb8,0x8863 or 0xe5d4 respectively and forms.
Implement provided by the invention in gsm system the method for decoding AMR DTX frame, can be implemented among the GSM, effectively from the type of the DTX frame that identified used AMR the data of noise pollution.
Embodiment
Be the identification of explanation the inventive method or the object of decoding, the special frames and the recognition mode that the present invention are needed decipher/discern are described as follows:
1) full rate SID_UPDATE frame, recognition mode are 0,1,0,0,1,1,1,1, and 0 is repeated to 212 bits;
2) full rate SID_FIRST frame, recognition mode are 0,1,0,0,1,1,1,1, and 0 is repeated to 212 bits;
3) full rate ON_SET frame, one of four kinds of patterns are repeated to 228 bits by 0x530f or 0x3eb8 or 0x8863 or 0xe5d4 and form;
4) half rate SID_UPDATE frame, recognition mode are 1,0,1,1,0,0,0,0, and 1 is repeated to 212 bits;
5) half rate SID_UPDATE_INH frame, recognition mode are 0,1,0,0,1,1,1,1, and 0 is repeated to 212 bits;
6) half rate SID_FIRST_P1 frame, recognition mode are 0,1,0,0,1,1,1,1, and 0 is repeated to 212 bits;
7) half rate SID_FIRST_P2 frame, one of four kinds of patterns repeat complete 114 bits by 0x530f or 0x3eb8 or 0x8863 or 0xe5d4 and form;
8) half rate SID_FIRST_INH frame, recognition mode are 1,0,1,1,0,0,0,0, and 1 is repeated to 212 bits;
9) half rate ONSET frame, one of four kinds of patterns are repeated to 114 bits by 0x530f or 0x3eb8 or 0x8863 or 0xe5d4 and form.
It should be noted that the frame that recognition mode is identical, its placement location difference, supposition has here been extracted data from the tram.
Below each step of the frame of the above-mentioned type of discontinuous transmission being discerned or deciphered according to the inventive method is described in detail as follows:
Step 1:, calculate threshold T according to the signal to noise ratio snr of receiving terminal demodulator output.
Decision threshold of the present invention is related with noise, in other words, the present invention is according to different noises, determine different thresholdings, promptly under the related prerequisite with noise of thresholding, at the receiving terminal of above-mentioned 9 kinds of special frames, demodulator can be exported a signal to noise ratio snr of representing with decibels, the inventive method determines that the method for thresholding is exactly the signal to noise ratio snr that obtains according to demodulation, calculates the threshold T under this signal to noise ratio.Its process is as follows:
1) reliability (reliability was about 0.25 when this reliability was thought SNR13dB) of calculating SNR correspondence:
p＝10
SNR/20/17
2) the reliability p that calculates is carried out amplitude limit, promptly p got 0.25 above 0.25 o'clock;
3) calculate thresholding T according to reliability p:
T=N*p*127, the total bit number of N for calculating
In specific implementation, the calculating of thresholding also can be calculated the relation between SNR and the thresholding in advance, is arranged to a table, when needing, as long as remove to look into this table with the SNR of demodulation output as index, just can directly obtain corresponding thresholding T at every turn.Can reduce the time overhead that calculates invention like this.
Step 2: calculate the degree of correlation
Demodulator is exported the soft-decision data of relevant frame, is generally a string 8bit signed integer, and polarity is negative polarity, and-128 expressions send symbols near " 1 ", and 127 expressions send symbols near " 0 ", and 0 is expressed as " 1 " and " 0 " etc. generally; The details of calculating the degree of correlation is as follows:
2-1) soft-decision data pattern IMD (n) is carried out amplitude limit, promptly soft-decision data mode bit IM_D (n) amplitude limit of demodulator being exported according to described signal to noise ratio snr is IM_D (n) '; The peak of concrete hypothesis permission amplitude is dithered as: Δ=p*127
If IM_D (n)＞128+ Δ IM_D (n) '=128+ Δ
If IM_D (n)＜128-Δ IM_D (n) '=128-Δ
Otherwise constant, i.e. IM_D (n) '=IM_D (n).
2-2) the recognition mode IM negative polarity with frame type to be decoded turns to IM ', and " 1 " that is about among the recognition mode IM of frame type to be decoded becomes " 1 ", and " 0 " becomes " 1 ";
2-3) data of part or all the recognition mode IM ' corresponding with this frame of the IM_D that contains N bit (n) ' behind the amplitude limit part or all (＜=N) multiplied each other, make related operation, calculate degree of correlation R=IM_D (n) ' * IM ';
Step 3: carry out the judgement of DTX frame type according to the thresholding and the degree of correlation
Compare judgement according to the relatedness computation that obtains previously R and the calculating as a result or the thresholding T that obtains that tables look-up, decision method is as follows: if R＞=T, then judgement for data and the pattern matching of comparison, thereby can determine that this frame type is and the frame of this pattern correspondence; Otherwise judgement is for non-, and promptly this frame type is the frame of used pattern IM correspondence unlikely.
Handling process based on the general decoding of the inventive method below is described
1) IM that will prepare identification in advance carries out the negative polarity processing, and recognition mode comprises:
0,1,0,0,1,1,1,1,0; 1,0,1,1,0,0,0,0,1; 1,1,1,0,0,1,0,1,1,0,0,0,1,1,0,1,0,0; 0,0,0,1,1,0,1,0,0,1,1,1,0,0,1,0,1,1; And 16 0x530f of representing of system, 0x3eb8,0x8863,0xe5d4.
2) table look-up according to signal to noise ratio snr, obtain threshold T;
3) according to signal to noise ratio snr, the soft-decision data mode bit IM_D (n) from demodulator output is carried out amplitude limit, amplitude limit is IM_D (n) ';
4) calculate degree of correlation R=IM_D (n) ' * IM ';
5) if R 〉=T judges that the frame type of current I M correspondence is the frame type of dateout, finish translator; Otherwise use another IM ' to get back to step 4), all calculated, illustrate under the current threshold value situation and can't decipher or discern this moment up to whole IM '.
Below be that full rate SID_UPDATE is an example with the Frame that sends, the decode procedure example of above-mentioned handling process to a specific coding is described.The Frame of being supposed is full rate SID_UPDATE, and its corresponding recognition mode IM is 0,1,0,0,1,1,1,1, and 0 is repeated to 212 bits; Suppose and in advance whole 9 kinds of recognition mode IM are carried out the negative polarity processing and store; Suppose that the partial data of receiving is 9 bit mode IM_D (9), each bit mode is the binary number of 8 of tape symbol positions, below represents that decimally IM_D (9) is: 39-28 49 26-46-43-42-31 36;
The signal to noise ratio snr of supposing demodulator output is 10dB, calculates p=0.186 according to formula, and N=9 (assumed calculation 9 bits) calculates thresholding T=213 (round numbers);
It is as follows that mode bit IM_D (9) is carried out amplitude limit:
39-＞32 49-＞32 46-＞32 43-＞32 42-＞32 36-＞32, all the other are constant;
Obtain IM_D (9) ' 32-28 32 26-32-32-32-31 32 after spacing
Recognition mode IM negative polarity is turned to IM '=1 ,-1,1,1 ,-1 ,-1 ,-1 ,-1,1
Calculate degree of correlation R
＝IM_D(9)’*IM(9)’
＝32*1-28*(-1)+32*1+26*1-32*(-1)-32*(-1)-32*(-1)-31*(-1)+32*1
＝277
Because, be the judgement of full rate SID_UPDATE frame so R＞T makes the frame type of receiving.
Claims (7)
1. the interpretation method to the adaptive multi-rate speech coding under the discontinuous transmission standard is characterized in that, may further comprise the steps:
A1) according to the signal to noise ratio snr of receiving terminal demodulator output, calculate threshold T;
A2) according to described signal to noise ratio snr, soft-decision data mode bit IM_D (n) amplitude limit that demodulator is exported is IM_D (n) ';
A3) negative polarity among the type identification pattern IM of frame to be decoded is turned to IM ';
A4) part or all of the data of part or all and the IM ' of the IM_D that contains N bit (n) ' behind the amplitude limit carried out related operation, calculate degree of correlation R;
A5) if degree of correlation R more than or equal to threshold T, the frame type of then determining demodulator output has identical type with frame to be decoded, otherwise the recognition mode IM ' with another negative polarity processing gets back to steps A 4), have nothing to do up to the frame frame type corresponding that whole recognition modes all calculated and degree of correlation R exports less than the then definite demodulator of threshold T with used pattern IM.
2. according to the described method of claim 1, it is characterized in that, the recognition mode IM negative polarity of frame type to be decoded is turned to the step of IM ', is each bit of forming IM to be carried out bit " 0 " become the conversion that " 1 ", " 1 " become " 1 ", obtains negative polarity recognition mode IM '.
3. according to the described method of claim 1, it is characterized in that the step of calculating threshold T according to the signal to noise ratio snr of receiving terminal demodulator output may further comprise the steps:
1) the reliability p of calculating SNR correspondence
p＝10
SNR/20/17
2) the reliability p that calculates is carried out amplitude limit, promptly surpass at 0.25 o'clock and get 0.25;
3) the figure place N according to reliability p and IM_D (n) calculates thresholding
T＝N*p*127。
4. according to the described method of claim 1, it is characterized in that soft-decision data mode bit IM_D (n) amplitude limit of demodulator being exported according to described signal to noise ratio snr is the step of IM_D (n) ', may further comprise the steps:
1) peak that the permission amplitude is set is shaken Δ=p*128;
2) if IM_D (n)＞128+ Δ is adjusted IM_D (n) '=128+ Δ;
3) if IM_D (n)＜128-Δ is adjusted IM_D (n) '=128-Δ, wherein p is the reliability of SNR correspondence.
5. according to the described method of claim 1, it is characterized in that described related operation is multiplying.
6. according to the described method of claim 3, it is characterized in that the corresponding relation with signal to noise ratio snr and threshold T calculates and is stored in the table in advance, searches this table by SNR at every turn and obtains threshold T.
7. according to any one described method among the claim 1-6, it is characterized in that described type identification pattern comprises following nine kinds:
1) recognition mode of full rate SID_UPDATE frame is 0,1,0,0,1,1,1,1, and 0 is repeated to 212 bits;
2) recognition mode of full rate SID_FIRST frame is 0,1,0,0,1,1,1,1, and 0 is repeated to 212 bits;
3) full rate ON_SET frame has four kinds of recognition modes, is repeated to 228 bits by 0x530f, 0x3eb8,0x8863 or 0xe5d4 respectively and forms;
4) recognition mode of half rate SID_UPDATE frame is 1,0,1,1,0,0,0,0, and 1 is repeated to 212 bits;
5) recognition mode of half rate SID_UPDATE_INH frame is 0,1,0,0,1,1,1,1, and 0 is repeated to 212 bits;
6) recognition mode of half rate SID_FIRST_P1 frame is 0,1,0,0,1,1,1,1, and 0 is repeated to 212 bits;
7) half rate SID_FIRST_P2 frame has four kinds of recognition modes, is repeated to 114 bits by 0x530f, 0x3eb8,0x8863 or 0xe5d4 respectively and forms;
8) recognition mode of half rate SID_FIRST_INH frame is 1,0,1,1,0,0,0,0, and 1 is repeated to 212 bits;
9) half rate ONSET frame has four kinds of recognition modes, is repeated to 114 bits by 0x530f, 0x3eb8,0x8863 or 0xe5d4 respectively and forms.
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| CN101394225B (en) * | 2007-09-17 | 2013-06-05 | 华为技术有限公司 | Method and device for speech transmission |
| CN101609682B (en) * | 2008-06-16 | 2012-08-08 | 向为 | Encoder and method for self adapting to discontinuous transmission of multi-rate wideband |
| CN101609683B (en) * | 2008-06-16 | 2012-08-08 | 向为 | Encoder and method for self adapting to discontinuous transmission of multi-rate narrowband |
| WO2012162870A1 (en) * | 2011-05-27 | 2012-12-06 | 富士通株式会社 | Apparatus and method for joint decoding, method, apparatus and receiver for necessity judgment |
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| CN1398126A (en) * | 2001-07-18 | 2003-02-19 | 华为技术有限公司 | Method for implementing multi-language coding-decoding in universal mobile communication system |
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