CN1398126A - Method for implementing multi-language coding-decoding in universal mobile communication system - Google Patents
Method for implementing multi-language coding-decoding in universal mobile communication system Download PDFInfo
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- CN1398126A CN1398126A CN01123007A CN01123007A CN1398126A CN 1398126 A CN1398126 A CN 1398126A CN 01123007 A CN01123007 A CN 01123007A CN 01123007 A CN01123007 A CN 01123007A CN 1398126 A CN1398126 A CN 1398126A
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Abstract
This invention discloses a method of realizing multi-phoneme code/decode in mobile telecommunication system containing first selecting a rate mode according to coding type to call unified AMR phoneme code/decode module to output phonetic code bit according to the definite rate if it is not mure, or to select each comfortable noise generating and discontinuous transmitting modules to output mute code bit if it is mute. Decode is the inversion of code by adding an error frame compensation and a mute process progress only and output a unified 13 bit linear PCM data. On the bases of ensuring phonetic quality, 7 phonetic code/decode defined by all UMTS system narrowband phonetic service realized uniformly based on a phonetic code/decode algorithm.
Description
Technical field
The present invention relates to a kind of encoding and decoding speech technology, relate more specifically to the unified method that realizes multiple encoding and decoding speech in the Universal Mobile Telecommunications System (UMTS).
Background technology
Audio coder ﹠ decoder (codec) TC (Transcoder) is the basis that the UMTS system realizes the voice bearer business.It is essential not only to go up at subscriber equipment (UE), and the voice bearer equipment in the present stage core net also is the functional entity that must use.The 3GPP normal structure is the UMTS system 7 kinds of encoding and decoding speechs of having realized the narrowband speech service definition: gsm system enhanced full rate encoding and decoding (GSM EFR), tdma system enhanced full rate encoding and decoding (TDMA EFR), PDC system enhanced full rate encoding and decoding (PDC EFR), half rate AMR encoding and decoding speech (HR AMR), full rate AMR encoding and decoding speech (FR AMR), the AMR of UMTS system encoding and decoding speech (UMTS AMR), the AMR of UMTS system encoding and decoding speech standard 2 (UMTS AMR 2) (seeing 3GPP TS 26.103).Wherein, GSM EFR, TDMA EFR, PDC EFR, HR AMR, FR AMR are the voice coding/decoding algorithms of traditional 2G system, and UMTS AMR and UMTS AMR 2 are the audio coder ﹠ decoder (codec)s for UMTS system redetermination.Voice bearer equipment on the UMTS core net is in order to realize under the TFO pattern and the intercommunication of other mobile communcations systems (the UMTS system of GSM, IS54, IS136, PDC, R99 etc.) that its audio coder ﹠ decoder (codec) must be supported above-mentioned all 7 kinds of encoding and decoding speech agreements.The UE of UMTS is in order to realize the non-cascade system of codec (Transcoder Free Operation-is called for short TFO) mode communication and at a plurality of systems internetwork roaming, also to need to support as far as possible multiple encoding and decoding speech agreement.
In order to achieve the above object, common way realizes all 7 kinds of voice coding/decoding algorithms exactly respectively in audio coder ﹠ decoder (codec).Yet, because voice coding/decoding algorithms is very complicated, the cost of this implementation method very expensive (exploitation or buying voluntarily).And the storage space of high-speed semiconductor device (as DSP) that is generally used for realizing encoding and decoding speech is very limited, and particularly UE is subjected to effects limit such as cost, power consumption, volume, and its memory space is nervous especially.In order to realize that 7 kinds of needed program spaces of voice coding/decoding algorithms and data space are all considerable and to be difficult to bear.
Summary of the invention
The objective of the invention is to be to overcome the defective of above-mentioned existence, guaranteeing under the constant prerequisite of voice quality, based on the unified 7 kinds of encoding and decoding speechs realizing all UMTS system narrowband speech service definition of a kind of voice coding/decoding algorithms, with economy, the realizability of the remarkable UMTS of improvement system voice codec and solve the big problem of memory space that takies.
Method of the present invention realizes by the following technical solutions, realizes the method for multiple encoding and decoding speech in Universal Mobile Telecommunications System, and this method comprises the steps:
During coding at first according to the current type of coding of command determination that is provided with;
Select rate mode according to type of coding;
Call unified AMR speech coding module then, carry out encoding operation;
Wherein, if determine it is quiet through silence detection, then call separately comfort noise coding (SID) and discontinuous transmission (DTX) module according to the respective coding type;
If right and wrong are quiet, then according to the speed output speech coding bit of determining;
Whether decoding is the inverse process of coding, at first judges its bad frame indication (BFI) sign from the frame that receives, check to judge whether to do wrong frame compensation according to bad frame indication (BFI) sign by wrong frame;
If judge it is wrong frame, then carry out wrong frame compensation and off beat and handle;
If judge it is normal, then judge whether it is quiet according to comfort noise coding (SID) sign, if quiet, then the corresponding code/decode type of basis calls separately discontinuous transmission and comfort noise decoder module;
If right and wrong are quiet, then speed is set according to corresponding code/decode type, carry out the AMR decode operation, unified at last output 13bit linear PCM data.
Described definite speed and according to corresponding code/decode type speed is set and is: GSMEFR selects AMR_12.20, TDMA_EFR selects AMR_7.40, PDC_EFR selects AMR_6.70, and HR AMR, FR AMR, UMTS AMR and UMTS AMR 2 then basis rate controlled order separately determine speed.
The present invention is based on the unification of AMR encoding and decoding speech and realized professional all the 7 kinds of voice coding/decoding algorithms stipulated of UMTS system narrowband speech, significantly reduced the realization cost of UMTS audio coder ﹠ decoder (codec), solve the problem of memory space, obviously improved system's implementation efficiency.
Description of drawings
Further specify method of the present invention below in conjunction with drawings and Examples.
Fig. 1 is the coding schematic flow sheet that the inventive method is used;
Fig. 2 is the decoding process schematic diagram that the inventive method is used;
Fig. 3 is the size of code statistical form trrellis diagram of traditional implementation method;
Fig. 4 is the size of code statistical form trrellis diagram of implementation method of the present invention;
Fig. 5 is the memory space comparison sheet trrellis diagram of distinct methods.
Embodiment
The method of multiple encoding and decoding speech that realizes in Universal Mobile Telecommunications System of the present invention realizes by the following technical solutions, in above-mentioned 7 kinds of voice coding/decoding algorithms, the algorithm core of HR AMR, FR AMR, UMTS AMR and UMTS AMR 2 all is based on the adaptive multi-rate algorithm, its principle all is identical with structure, for no other reason than that the applied environment difference, the rate controlled scope of algorithm is difference to some extent.And offer some clarification on UMTS AMR 2 in the agreement fully can compatible HRAMR, FR AMR, UMTS AMR.Therefore, can use unified HRAMR, FR AMR, the UMTS AMR of realizing of UMTS AMR 2 agreements.
The AMR algorithm is the voice coding/decoding algorithms of many speed, and one has 8 kinds of patterns (AMR_12.20, AMR_10.20, AMR_7.95, AMR_7.40, AMR_6.70, AMR_5.90, AMR_5.15, AMR_4.75), respectively corresponding 8 kinds of speed (12.20 kbit/s (GSM EFR), 0.20 kbit/s, 7.95 kbit/s, 7.40 kbit/s (TDMA-EFR), 6.70 kbit/s (PDC-EFR), 5.90 kbit/s, 5.15 kbit/s, 4.75 kbit/s).
In addition, AMR also supports Voice Activity Detection and discontinuous transmission function (DTX), a periodic transmission comfort noise during quiet (by the carrying of SID frame), and other times do not transmit any data.Therefore, except above-mentioned 8 kinds of rate modes, also have AMR_SID (1.80 kbit/s) and two kinds of patterns of AMR_NODATA (0 kbit/s).
GSM EFR, TDMA EFR and PDC EFR are the voice coding/decoding algorithms of fixed rate, and its speed is respectively 12.20 kbit/s, 7.40 kbit/s, 6.70 kbit/s.Because the algorithm principle of AMR, GSMEFR, TDMA EFR and PDC EFR all is to adopt " excitation of arithmetic code book " method (ACELP), and when designing the AMR decoding algorithm, has considered compatible demand, so AMR_12.20 pattern and GSM EFR are compatible; AMR_7.40 pattern and TDMA EFR are compatible; AMR_6.70 pattern and PDC EFR are compatible.But their the quiet frame (SID frame) under silence detection and discontinuous transmission pattern but is incompatible: the size of AMR_SID frame is that 35bit and every 160ms upgrade once, and the quiet frame of GSM EFR to be 244bit and every 480ms upgrade once, the quiet frame of TDMAEFR is 38bit and can upgrades 1 continuously.In addition, the DTX of different phonetic encoding and decoding control also is different, and for example TDMA-EFR and PDC-EFR only support up discontinuous transmission (DTX) in original system, do not support descending DTX; And the level and smooth mechanism of the DTX of AMR and other encoding and decoding is also different.Because the discontinuous transmission pattern can effectively increase the wireless channel capacity, saves UE power, save transfer resource, is the default configuration item of UMTS equipment therefore.When coding/decoding negotiation, except the encoding and decoding speed of appointment, default setting SID pattern and NO DATA pattern.Therefore incompatible AMR and GSM EFR, TDMA EFR and the PDC EFR of in fact having caused of above-mentioned SID frame can't unify to realize.
Method of the present invention, on the basis of the core algorithm of AMR encoding and decoding speech, the discontinuous transmission (DTX) of integrated GSM EFR, TDMA EFR and PDC EFR agreement and comfort noise produce function, control by code/decode type and pattern, 7 kinds of encoding and decoding speechs of unified realization, concrete encoding and decoding flow process is described below:
Fig. 1 is the coding schematic flow sheet that the inventive method is used.As shown in Figure 1,13bit linear PCM data flow is at the command determination current type of coding of step S101 according to setting, in follow-up step, set speed according to the type of coding that step S101 selects:, then be set at the speed of AMR_12.20kbps at step S102-1 if select the GSM-EFR encoding and decoding; If select TDMA-EFR, then be set at the speed of AMR_7.40kbps at step S102-2; If select PDC-EFR, then be set at the speed of AMR_6.70 at step S102-3; If select HR AMR, FR AMR, UMTS AMR, UMTS AMR 2, then order is provided with the speed of appointment according to rate controlled to step S102-7 at step S102-4.At step S103: the speed of setting according to step S102, carry out AMR speech coding function, then judge in the cataloged procedure of step S103 at step S104, judge that according to calculating parameter export non-quiet frame still is quiet frame, quiet if judge between right and wrong, then at step S105 output compress speech code stream; If judge it is quiet, then judge the present encoding type at step S106: if judge is GSM-EFR, then carry out the parameter of the quiet frame of algorithm computation of GSM-EFR at step S107-1, and in the method output quiet data of step S108-1 according to the discontinuous transmission of GSM-EFR; If TDMA-EFR, then carry out the parameter of the quiet frame of algorithm computation of TDMA-EFR, in the method output quiet data of step S108-2 according to the discontinuous transmission of TDMA-EFR at step S107-2; If PDC-EFR, then carry out the parameter of the quiet frame of algorithm computation of PDC-EFR, in the method output quiet data of step 108-3 according to the discontinuous transmission of PDC-EFR at step S107-3; If HR is AMR, FR AMR, UMTS AMR, UMTS AMR 2, then in the seek unity of action parameter of the quiet frame of algorithm computation of UMTS AMR 2 of step S107-4, in the method output quiet data of step 108-4 according to the discontinuous transmission of UMTS AMR 2.
Decoding is the inverse process of coding, only increases a wrong frame compensation and off beat and handles.Fig. 2 is the decoding process schematic diagram that the inventive method is used.As shown in Figure 1, at step S201: from the frame that receives, judge its bad frame indication (Bad Frame Indication-is called for short BFI) sign, check whether be wrong frame; If it is normal that step S201 judges, then program enters step S203, is wrong frame if step S201 judges, then carries out wrong frame compensation and off beat processing at step S202, judges its SID sign at step S203 from the frame that receives; If judge it is quiet, then judge current code/decode type at step S204 at step S203; Code/decode type according to step S204 judges calls different quiet handling procedures: if GSM-EFR then exports quiet data at step S205-1 and step S206-1 according to discontinuous transmission and the SID parameter of GSM-EFR; If TDMA-EFR then exports quiet data at step S205-2 and step S206-2 according to discontinuous transmission and the parameter of TDMA-EFR; If PDC-EFR then exports quiet data at step S205-3 and step S206-3 according to discontinuous transmission and the SID parameter of PDC-EFR; If HR is AMR, FRAMR, UMTS AMR, UMTS AMR 2, then in step S205-4 and step S206-4 discontinuous transmission and SID parameter output quiet data according to UMTSAMR 2; If step S203 is judged as non-quiet, then judge current code/decode type at step S207; The code/decode type of judging according to step S207 is provided with speed: if GSM-EFR, then be arranged to the speed of AMR_12.20 at step S208-1; If TDMA-EFR, then be arranged to the speed of AMR_7.40 at step S208-2; If PDC-EFR, then be arranged to the speed of AMR_6.70 at step S208-3; If HRAMR, FR AMR, UMTS AMR, UMTS AMR 2, then step S208-4 according to rate controlled order be arranged to the speed of appointment; At step S209:, carry out AMR tone decoding function at step S209 according to the speed that S208 is provided with; At step S210: the linear PCM data of output 13bit, so far, the whole process of encoding and decoding programs has been described.
The comfort noise that the present invention only needs to add GSM EFR, TDMA EFR and PDC EFR on the basis of AMR algorithm generates (SID) and discontinuous transmission (DTX) module and speed appointment and control module, the realization workload that increases is very little, the arthmetic statement program of ANSI C language of using AMR, GSM EFR, TDMA EFR, PDC EFR algorithm protocol respectively is as the standard of workload, Fig. 3 has described the size of code of the required exploitation of traditional implementation method, and Fig. 4 has described the size of code of the required exploitation of implementation method of the present invention.The total of two figure above the contrast, the size of code that the present invention need realize only reaches 48% of traditional implementation method, realizes that cost (development time and expense) reduces greatly.
On memory space, effect of the present invention is fairly obvious.Fig. 5 has provided traditional implementation method and has realized the needed memory span of all encoding and decoding speechs respectively with reference to the application example on TMS320C54X DSP.This shows that the method that the present invention realizes has been saved 2.8 times in the program space than conventional method; Saved 2.6 times on the table space, effect is fairly obvious.According to traditional implementation method, realize the space that 1 road UMTS encoding and decoding speech is handled needs 92K * 16bit, surpass the on-chip memory capacity of most of fixed DSPs; And implementation method of the present invention only needs the space of 35.4K * 16bit, can realize on general fixed DSP.Therefore hardware implementation cost also reduces greatly.
Claims (3)
1, realize the method for multiple encoding and decoding speech in Universal Mobile Telecommunications System, it is characterized in that: described method comprises the steps:
During coding at first according to the current type of coding of command determination that is provided with;
Select rate mode according to type of coding;
Call unified AMR speech coding module then, carry out encoding operation;
Wherein, if determine it is quiet through silence detection, then call separately comfort noise coding (SID) and discontinuous transmission (DTX) module according to the respective coding type;
If right and wrong are quiet, then according to the speed output speech coding bit of determining;
Whether decoding is the inverse process of coding, at first judges its bad frame indication (BFI) sign from the frame that receives, check to judge whether to do wrong frame compensation according to bad frame indication (BFI) sign by wrong frame;
If judge it is wrong frame, then carry out wrong frame compensation and off beat and handle;
If judge it is normal, then judge whether it is quiet according to comfort noise coding (SID) sign, if quiet, then the corresponding code/decode type of basis calls separately discontinuous transmission and comfort noise decoder module;
If right and wrong are quiet, then speed is set according to corresponding code/decode type, carry out the AMR decode operation, unified at last output 13bit linear PCM data.
2, method according to claim 1, it is characterized in that: described multiple be seven kinds, these seven kinds of encoding and decoding speechs are: gsm system enhanced full rate encoding and decoding (GSM EFR), tdma system enhanced full rate encoding and decoding (TDMA EFR), PDC system enhanced full rate encoding and decoding (PDC EFR), half rate AMR encoding and decoding speech (HR AMR), full rate AMR encoding and decoding speech (FR AMR), the AMR of UMTS system encoding and decoding speech (UMTS AMR), the AMR of UMTS system encoding and decoding speech standard 2 (UMTS AMR 2).
3, method according to claim 1, it is characterized in that: described definite speed and according to corresponding code/decode type speed is set and is: GSM EFR selects AMR_12.20, TDMA_EFR selects AMR_7.40, PDC_EFR selects AMR_6.70, and HR AMR, FR AMR, UMTS AMR and UMTS AMR 2 then basis rate controlled order separately determine speed.
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