EP2277172A1 - Dissimulation d'erreur de transmission dans un signal audionumerique dans une structure de decodage hierarchique - Google Patents
Dissimulation d'erreur de transmission dans un signal audionumerique dans une structure de decodage hierarchiqueInfo
- Publication number
- EP2277172A1 EP2277172A1 EP09730641A EP09730641A EP2277172A1 EP 2277172 A1 EP2277172 A1 EP 2277172A1 EP 09730641 A EP09730641 A EP 09730641A EP 09730641 A EP09730641 A EP 09730641A EP 2277172 A1 EP2277172 A1 EP 2277172A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- frame
- signal
- samples
- erased
- missing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 49
- 230000007704 transition Effects 0.000 claims abstract description 30
- 230000005284 excitation Effects 0.000 claims description 39
- 230000015572 biosynthetic process Effects 0.000 claims description 22
- 238000003786 synthesis reaction Methods 0.000 claims description 22
- 230000015654 memory Effects 0.000 claims description 20
- 238000002360 preparation method Methods 0.000 claims description 7
- 230000003595 spectral effect Effects 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 3
- 230000006870 function Effects 0.000 description 6
- 239000000523 sample Substances 0.000 description 6
- 238000006257 total synthesis reaction Methods 0.000 description 6
- 238000004422 calculation algorithm Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000013213 extrapolation Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
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- 230000000717 retained effect Effects 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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- 230000002194 synthesizing effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/005—Correction of errors induced by the transmission channel, if related to the coding algorithm
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
- G10L19/0212—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders using orthogonal transformation
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/16—Vocoder architecture
- G10L19/18—Vocoders using multiple modes
- G10L19/24—Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
Definitions
- the present invention relates to the processing of digital signals in the telecommunications field. These signals may be, for example, speech and music signals.
- the present invention intervenes in a coding / decoding system adapted for the transmission / reception of such signals. More particularly, the present invention relates to a reception processing for improving the quality of the decoded signals in the presence of data block losses.
- CELP coding for "Code Excited Linear Prediction"
- the current frame to be decoded is then declared erased ("bad frame" in English). These procedures make it possible to extrapolate to the decoder the samples of the missing signal from the signals and data from the previous frames.
- Such techniques have been implemented mainly in the case of parametric and predictive coders (techniques for recovery / concealment of erased frames). They make it possible to strongly limit the subjective degradation of the signal perceived at the decoder in the presence of erased frames. These algorithms rely on the technique used for the encoder and decoder, and are in fact an extension of the decoder.
- the purpose of the hiding devices of erased frames is to extrapolate the parameters of the erased frame from the last (or more) previous frames considered valid.
- Some parameters manipulated or coded by predictive coders have a strong inter-frame correlation (in the case of Linear Predictive Coding (LPC) parameters which represent the spectral envelope, and LTP parameters (for Long Term Prediction). English) long-term prediction that represents the periodicity of the signal (for voiced sounds, for example) . This correlation makes it much more advantageous to reuse the parameters of the last valid frame to synthesize the erased frame than use erroneous or random parameters.
- LPC Linear Predictive Cod
- an excitation signal can be randomly generated (by drawing a codeword of the past excitation, by a slight damping of the gain of the past excitation, by random selection in the past excitement, or still using transmitted codes that may be totally wrong).
- FIG. 1a illustrates the hierarchical coding of CELP frames CO to C5 and the transforms M1 to M5 applied to these frames.
- the decoder in the presence of errors on the bitstream, the decoder operates as follows.
- FEC frame Erasure Concealment
- a valid frame includes information on the previous frame to improve the concealment of erased frames and resynchronization between erased frames and valid frames.
- the decoder receives in the bit stream of the frame 5 information on the nature of the previous frame (for example classification indication, information on the spectral envelope).
- Classification information means information on voicing, non-voicing, the presence of attacks, etc.
- the decoder synthesizes the previous erroneous frame (frame 4) by using a technique for concealing erased frames that benefits from the information received with the frame 5, before synthesizing the CELP signal C5.
- this transition step can be provided by a linear prediction synthesis filtering step using to generate the second set of missing samples the transition point filter memories stored in the first step of concealment.
- the memories of the synthesis filter at the transition point are stored in the first concealment step.
- the excitation is determined according to the information received. The synthesis is performed from the transition point using on the one hand the excitation obtained, on the other hand the memories of the stored synthesis filter.
- the first set of samples is all the missing samples of the erased frame and the second set of samples is a part of the missing samples of the erased frame.
- the information present in a valid frame is for example information on the classification of the signal and / or on the spectral envelope of the signal.
- the signal classification information makes it possible, for example, for the step of concealing the second set of missing samples to adapt respective gains of a harmonic part of the excitation signal and of a random part of the excitation signal. for the signal corresponding to the erased frame.
- a step of preparing the step of concealing the second set of missing samples is implemented in the first time interval.
- the step of preparing the step of concealing the second set of missing samples is performed in a time interval different from that corresponding to the decoding of the valid frame. This therefore makes it possible to distribute the calculation load of the concealment step of the second set of samples and thus to reduce the peak of complexity in the time interval corresponding to the reception of the first valid frame. As shown above, it is indeed in this time interval corresponding to the valid frame that is the peak complexity or worse case of complexity of the decoding.
- the distribution of the complexity thus carried out makes it possible to review downward the sizing of the processor of a transmission error concealment device which is dimensioned according to the worst case of complexity.
- the preparation step comprises a step of generating a harmonic portion of the excitation signal and a step of generating a random portion of the excitation signal for the signal corresponding to the erased frame.
- the present invention also relates to a transmission error concealment device in a digital signal divided into a plurality of successive frames associated with different time intervals in which, on reception, the signal may comprise erased frames and frames. valid, valid frames with information (inf.) relating to the loss of frame concealment.
- the device is such that it intervenes during a hierarchical decoding using a core decoding and a transform decoding using low delay windows introducing a time delay less than one frame with respect to the decoding heart, and that it comprises: a concealment module able to generate, in a first time interval, a first set of missing samples for at least the last frame erased before a valid frame and able to generate, in a second time slot, a second set of missing samples for the erased frame taking into account information of said valid frame, and a transition module able to make a transition between the first set of missing samples and the second set of missing samples to obtain at least part of the missing frame.
- This device implements the steps of the concealment method as described above.
- the invention also relates to a digital signal decoder comprising a transmission error concealment device according to the invention.
- the invention relates to a computer program intended to be stored in a memory of a transmission error concealment device.
- This computer program is such that it includes code instructions for implementing the steps of the error concealment method according to the invention, when executed by a processor of said transmission error concealment device.
- It relates to a storage medium, readable by a computer or by a processor, integrated or not into the device, storing a computer program as described above.
- FIG. 2 illustrates the concealment method according to the invention in a first embodiment
- FIG. 3 illustrates the concealment method according to the invention in a second embodiment
- FIGS. 4a and 4b illustrate the synchronization of the reconstruction using the concealment method according to the invention
- FIG. 5 illustrates an exemplary hierarchical coder that can be used in the context of the invention
- FIG. 6 illustrates a hierarchical decoder according to the invention
- - Figure 7 illustrates a concealment device according to the invention.
- the transmission error concealment method according to a first embodiment of the invention is now described.
- the frame N received at the decoder is erased.
- a valid N-I frame received at the decoder is processed by a demultiplexing module DEMUX, normally decoded at 21 by a DE-NO decoding module.
- the decoded signal is then stored in a memory buffer MEM during a step 22. At least part of this memorized decoded signal is sent to the sound card 30 at the output of the decoder of the frame NI, the decoded signal remaining in the memory buffer is retained to be sent to the sound card after decoding the next frame.
- this extrapolated signal memorized, together with the decoded signal of the NI frame remaining stored, is sent to the sound card 30 at the output of the decoder of the frame N.
- the extrapolated signal remaining in the buffer memory is retained to be sent to the sound card after decoding the next frame.
- a step of concealing a second set of missing samples for the erased N frame is performed at 25 by the DE-MISS error concealment module. This step uses information present in the valid frame N + 1 that is obtained during a step
- the information present in a valid frame includes information on the previous frame of the bit stream. These include signal classification information (voiced, unvoiced, transient signal) or information on the spectral envelope of the signal.
- harmonic excitation is meant the excitation calculated from the pitch value (number of samples in a period corresponding to the inverse of the fundamental frequency) of the signal of the preceding frame, the harmonic part of the excitation signal. is thus obtained by copying the excitation passed to the moments corresponding to the delay of the pitch.
- random excitation is meant the excitation signal obtained from a random signal generator or by random draw of a code word of the past excitation or in a dictionary.
- a larger gain is calculated for the harmonic part of the excitation and in the case where the classification of the signal indicates an unvoiced frame, a larger gain is calculated for the random part of the excitation.
- the part of the harmonic excitation is completely erroneous. In this case, several frames may be necessary before the decoder regains normal excitation and therefore an acceptable quality. Thus, a new artificial version of the harmonic excitation can be used to allow the decoder to find normal operation more quickly.
- the information on the spectral envelope can be a stability information of the LPC linear prediction filter.
- this information indicates that the filter is stable between the previous frame and the current (valid) frame
- the step of concealing a second set of missing samples uses the linear prediction filter of the valid frame. Otherwise, the filter from the past is used.
- a transition step 29 by a TRANS transition module is performed.
- This module takes into account the first set of samples generated at step 23 not yet played on the sound card and the second set of samples generated in step 25 to obtain a smooth transition between the first set and the second set.
- this transition step is a step of crossfading or addition-overlap which consists in gradually decreasing the weight of the extrapolated signal in the first set and gradually increasing the weight of the signal extrapolated in the second set to get the missing samples from the erased frame.
- this fade-in step corresponds to the multiplication of all the samples of the extrapolated signal stored at the frame N with a weighting function decreasing progressively from 1 to 0, and the addition of this weighted signal with the samples of the signal extrapolated to the N + 1 frame multiplied with the complementary weighting function of the weighting function of the memorized signal.
- complementary weighting function is meant the function obtained by subtracting one by the preceding weighting function.
- this fade-in step is performed on only a part (at least one sample) of the stored signal.
- this transition step is provided by the linear prediction synthesis filtering.
- the memories of the synthesis filter at the transition point are stored in the first concealment step.
- the excitation is determined according to the information received.
- the synthesis is performed from the transition point using on the one hand the excitation obtained, on the other hand the memories of the stored synthesis filter.
- the valid frame is therefore demultiplexed at 26, decoded normally at 27 and the decoded signal is stored at 28 in the memory buffer MEM.
- the signal from the transition module TRANS is sent together with the decoded signal of the N + 1 frame to the sound card 30 at the output of the decoder of the N + 1 frame.
- the signal received by the sound card 30 is intended to be restored by speaker type reproduction means 31.
- the first set of samples and the second set of samples are the set of samples of the missing frame.
- a signal corresponding to the erased frame is generated, the crossfade is then performed on the part of the two signals corresponding to the second half of the erased frame (one half-frame) to obtain the samples of the frame missing.
- the concealment step in the time interval corresponding to the erased frame, the concealment step generates all the samples of the missing frame (these samples will be necessary if the next frame is also erased), while in the time interval corresponding to the decoding of the valid frame, the concealment step generates only a second portion of the samples, for example, the second half of the samples of the missing frame.
- the overlap addition step is performed to ensure a transition on this second half of the samples of the missing frame.
- the number of samples generated for the missing frame in the time interval corresponding to the valid frame is smaller than in the case of the first embodiment described above.
- the decoding complexity in this time interval is therefore reduced.
- FIG. 3 a second embodiment of the method according to the invention is illustrated in the case where the frame N received at the decoder is erased.
- a preparation step E1 referenced 32 is performed.
- This preparation step is for example a step of obtaining the harmonic part of the excitation using the value of the LTP delay of the previous frame, and of obtaining the random part of the excitation in a CELP decoding structure.
- This preparation step uses parameters of the previous frame stored in memory MEM. It is not useful for this step to use the classification information or the spectral envelope information of the erased frame.
- the concealment step 23 of the first set of samples as described with reference to FIG. 2 is also performed.
- the extrapolated signal derived therefrom is stored at 24 in the memory MEM. At least a part of this extrapolated signal memorized, together with the decoded signal remaining stored in the frame NI, is sent to the sound card 30 at the output of the decoder of the frame N.
- the extrapolated signal remaining in The buffer is kept for sending to the sound card after decoding the next frame.
- the step E2 referenced 33 of concealment including the extrapolation of the second set of missing samples corresponding to the erased N frame, is performed in the time interval corresponding to the N + 1 frame received at the decoder.
- This step comprises taking into account the information contained in the valid frame N + 1 and which concern the frame N.
- the concealment step corresponds to the calculation of the gains associated with the two parts of the excitation, and possibly to the correction of the phase of the harmonic excitation. Based on the classification information received in the first valid frame, the respective gains of the two portions of the excitation are matched. Thus, for example based on the classification information of the last valid frame received before the erased frames and the classification information received, the concealment step adapts the choice of the excitations and the associated gains to best represent the class of the frame. In this, the quality of the signal generated during the concealment step is improved by benefiting from the information received.
- step E2 favors the harmonic excitation obtained at the preparation step E1 rather than the random excitation and vice versa for a signal frame unvoiced.
- step E2 will generate missing samples according to the precise classification of the transient (voiced to unvoiced or voiceless to voiced).
- a step 29 addition-overlap or cross-fade as described with reference to Figure 2 is then performed between the first set of samples generated in step 23 and the second set of samples generated in step 33 .
- N + 1 is processed by the DEMUX demultiplexing module, is decoded at 27 and stored at 28 as previously described with reference to FIG. extrapolated obtained by the cross-fading step 29 and the decoded signal of the N + 1 frame are jointly sent to the sound card 30 at the output of the decoder of the N + 1 frame.
- FIGS. 4a and 4b illustrate the implementation of this method and the synchronization between the CELP type decoding and the transform decoding which uses low delay windows represented here in the form of windows as described in the patent application FR 0760258.
- FIG. 4a illustrates the hierarchical coding of CELP frames CO to C5 and the low-delay transforms M1 to M5 applied to these frames.
- the output frame 4 of the decoder is constructed using a portion of extrapolated samples for C3 (FEC-C3) and a portion of the first set of extrapolated samples for C4 (FEC 1 -C4).
- a step of concealing a second set of samples for the frame C4 is performed. This step uses the information on the C4 frame that is present in the valid frame C5. This second set of samples is reference FEC2-C4. A transition step between the first set of samples FEC1-C4 and the second set of samples FEC2-C4 is performed by overlapping or cross faded addition to obtain the missing samples FEC-C4 of the second half of the erased frame C4.
- the output frame 05 of the decoder is constructed using a portion of samples from the cross-fading step (FEC-C4) and a portion of the decoded samples for the valid frame C5.
- the core decoding is a CELP type decoding.
- This decoding heart can be of any other type. For example, it can be replaced by an ADPCM decoder
- a decoder according to the invention is described.
- This includes a demultiplexing module 60 able to process the incoming bit stream T.
- a first ACELP decoding stage 61 is performed.
- the signal thus decoded is oversampled by the module 62 at the frequency of the signal. It is then processed by an MDCT transform module 63.
- the transform used here is a weak delay transform as described in the "Low-Overlap" document presented in "Real-Time Implementation of the MPEG-4 Low-Delay Advanced Audio Coding".
- Algorithm (AAC-LD) is Motorola's DSP56300 "J. Hilpert et al published in the 108 th AES convention in February 2000 or as described in the patent application FR 07 60258.
- the time offset between the first decoding stage ACELP and that of the transform is therefore half a frame.
- the decoder includes a transmission error concealment device 70 which receives from the demultiplexing module erased frame information bf.
- This device comprises a concealment module 71 which according to the invention receives when decoding a valid frame, information inf. relating to the concealment of frame loss.
- the output signal of the heart of the hierarchical decoder is either the signal from the ACELP decoder 61 or the signal from the concealment module 70.
- the continuity between the two signals is ensured by the fact that they share the synthesis memories of the filter LPC linear prediction.
- the transmission error concealment device 70 according to the invention is, for example, as illustrated in FIG. 7.
- This device in the sense of the invention, typically comprises a ⁇ P processor cooperating with a memory block BM including a memory storage and / or work, as well as a aforementioned MEM memory buffer as a means for storing the decoded frames and sent with a time shift.
- This device receives as input successive frames of the digital signal Se and delivers the synthesized signal Ss comprising the samples of an erased frame.
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- Engineering & Computer Science (AREA)
- Computational Linguistics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0852043A FR2929466A1 (fr) | 2008-03-28 | 2008-03-28 | Dissimulation d'erreur de transmission dans un signal numerique dans une structure de decodage hierarchique |
PCT/FR2009/050489 WO2009125114A1 (fr) | 2008-03-28 | 2009-03-20 | Dissimulation d'erreur de transmission dans un signal audionumerique dans une structure de decodage hierarchique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2277172A1 true EP2277172A1 (fr) | 2011-01-26 |
EP2277172B1 EP2277172B1 (fr) | 2012-05-16 |
Family
ID=39639207
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09730641A Active EP2277172B1 (fr) | 2008-03-28 | 2009-03-20 | Dissimulation d'erreur de transmission dans un signal audionumerique dans une structure de decodage hierarchique |
Country Status (10)
Country | Link |
---|---|
US (1) | US8391373B2 (fr) |
EP (1) | EP2277172B1 (fr) |
JP (1) | JP5247878B2 (fr) |
KR (1) | KR101513184B1 (fr) |
CN (1) | CN101981615B (fr) |
BR (1) | BRPI0910327B1 (fr) |
ES (1) | ES2387943T3 (fr) |
FR (1) | FR2929466A1 (fr) |
RU (1) | RU2496156C2 (fr) |
WO (1) | WO2009125114A1 (fr) |
Families Citing this family (28)
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US20120265542A1 (en) * | 2009-10-16 | 2012-10-18 | France Telecom | Optimized parametric stereo decoding |
GB0920729D0 (en) * | 2009-11-26 | 2010-01-13 | Icera Inc | Signal fading |
DK2559028T3 (en) * | 2010-04-14 | 2015-11-09 | Voiceage Corp | FLEXIBLE AND SCALABLE COMBINED INNOVATIONSKODEBOG FOR USE IN CELPKODER encoder and decoder |
SG185519A1 (en) | 2011-02-14 | 2012-12-28 | Fraunhofer Ges Forschung | Information signal representation using lapped transform |
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ES2529025T3 (es) | 2011-02-14 | 2015-02-16 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Aparato y método para procesar una señal de audio decodificada en un dominio espectral |
MX2013009304A (es) | 2011-02-14 | 2013-10-03 | Fraunhofer Ges Forschung | Aparato y metodo para codificar una porcion de una señal de audio utilizando deteccion de un transiente y resultado de calidad. |
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KR101788484B1 (ko) | 2013-06-21 | 2017-10-19 | 프라운호퍼 게젤샤프트 쭈르 푀르데룽 데어 안겐반텐 포르슝 에. 베. | Tcx ltp를 이용하여 붕괴되거나 붕괴되지 않은 수신된 프레임들의 재구성을 갖는 오디오 디코딩 |
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EP3000110B1 (fr) * | 2014-07-28 | 2016-12-07 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Sélection d'un premier algorithme d'encodage ou d'un deuxième algorithme d'encodage au moyen d'une réduction des harmoniques |
BR112018068060A2 (pt) | 2016-03-07 | 2019-01-08 | Fraunhofer Ges Forschung | unidade de ocultação de erros, codificador de áudio e método relacionado e programa de computador usando características de uma representação decodificada de um quadro de áudio adequadamente decodificado |
EP3427257B1 (fr) * | 2016-03-07 | 2021-05-05 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Unité de dissimulation d'erreur, décodeur audio, et procédé et programme informatique associés permettant d'atténuer une trame audio dissimulée en fonction de différents facteurs d'amortissement pour différentes bandes de fréquence |
US10763885B2 (en) | 2018-11-06 | 2020-09-01 | Stmicroelectronics S.R.L. | Method of error concealment, and associated device |
WO2020164753A1 (fr) | 2019-02-13 | 2020-08-20 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Décodeur et procédé de décodage sélectionnant un mode de dissimulation d'erreur, et encodeur et procédé d'encodage |
CN111404638B (zh) * | 2019-12-16 | 2022-10-04 | 王振江 | 一种数字信号传输方法 |
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IL120788A (en) * | 1997-05-06 | 2000-07-16 | Audiocodes Ltd | Systems and methods for encoding and decoding speech for lossy transmission networks |
JP2001339368A (ja) * | 2000-03-22 | 2001-12-07 | Toshiba Corp | 誤り補償回路及び誤り補償機能を備えた復号装置 |
JP4458635B2 (ja) * | 2000-07-19 | 2010-04-28 | クラリオン株式会社 | フレーム補正装置 |
FR2813722B1 (fr) * | 2000-09-05 | 2003-01-24 | France Telecom | Procede et dispositif de dissimulation d'erreurs et systeme de transmission comportant un tel dispositif |
BRPI0212000B1 (pt) * | 2001-08-23 | 2017-12-12 | Polycom, Inc. | "system and method for processing video data" |
JP2003223194A (ja) * | 2002-01-31 | 2003-08-08 | Toshiba Corp | 移動無線端末装置および誤り補償回路 |
CA2388439A1 (fr) * | 2002-05-31 | 2003-11-30 | Voiceage Corporation | Methode et dispositif de dissimulation d'effacement de cadres dans des codecs de la parole a prevision lineaire |
FR2852172A1 (fr) * | 2003-03-04 | 2004-09-10 | France Telecom | Procede et dispositif de reconstruction spectrale d'un signal audio |
EP1604352A4 (fr) * | 2003-03-15 | 2007-12-19 | Mindspeed Tech Inc | Modele de suppression de bruit simple |
SE527669C2 (sv) * | 2003-12-19 | 2006-05-09 | Ericsson Telefon Ab L M | Förbättrad felmaskering i frekvensdomänen |
JP5420175B2 (ja) * | 2005-01-31 | 2014-02-19 | スカイプ | 通信システムにおける隠蔽フレームの生成方法 |
US7359409B2 (en) * | 2005-02-02 | 2008-04-15 | Texas Instruments Incorporated | Packet loss concealment for voice over packet networks |
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JP2011515712A (ja) | 2011-05-19 |
BRPI0910327A2 (pt) | 2015-10-06 |
BRPI0910327B1 (pt) | 2020-10-20 |
EP2277172B1 (fr) | 2012-05-16 |
WO2009125114A1 (fr) | 2009-10-15 |
RU2496156C2 (ru) | 2013-10-20 |
CN101981615B (zh) | 2012-08-29 |
US20110007827A1 (en) | 2011-01-13 |
KR20100134709A (ko) | 2010-12-23 |
FR2929466A1 (fr) | 2009-10-02 |
JP5247878B2 (ja) | 2013-07-24 |
US8391373B2 (en) | 2013-03-05 |
KR101513184B1 (ko) | 2015-04-17 |
ES2387943T3 (es) | 2012-10-04 |
RU2010144057A (ru) | 2012-05-10 |
CN101981615A (zh) | 2011-02-23 |
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