EP0945853B1 - Procédé pour réduire les effets de la perte de segments de parole dans une transmission par paquets - Google Patents

Procédé pour réduire les effets de la perte de segments de parole dans une transmission par paquets Download PDF

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Publication number
EP0945853B1
EP0945853B1 EP99102364A EP99102364A EP0945853B1 EP 0945853 B1 EP0945853 B1 EP 0945853B1 EP 99102364 A EP99102364 A EP 99102364A EP 99102364 A EP99102364 A EP 99102364A EP 0945853 B1 EP0945853 B1 EP 0945853B1
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EP
European Patent Office
Prior art keywords
packet
segment
received
estimated
packets
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EP99102364A
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German (de)
English (en)
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EP0945853A2 (fr
EP0945853A3 (fr
Inventor
Steffen Dipl.-Ing. Schönfuss
Rolf Dr. Kapust
Klaus-Dieter Dipl.-Ing. Michael
Peter Prof. Dr.-Ing. Noll
Christian Dipl.-Ing. Günther
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Deutsche Telekom AG
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Deutsche Telekom AG
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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

Definitions

  • the invention relates to a method for concealing Voice segment loss in packet-oriented transmission.
  • To maintain the bit integrity of the data stream and the quality of the voice transmission must take measures to Substitution of lost cells can be made.
  • a repeated request not received or received incorrectly Data such as B. in file transfer is at Real-time services such as telephony are not possible because information subsequently sent does not last indefinitely can be saved and output.
  • lost ones are lost Language packets substituted by the samples of the missing packet simply replaced by zero amplitudes or selects the code words so that after decoding the Result in zero amplitudes.
  • a substitution process is also known, which referred to as fundamental frequency synchronous waveform replacement becomes.
  • This procedure is based on adoption assumed that the speech signal statistics in temporal successive packages changes only slightly and the Waveform, especially with voiced sounds, for previous and next package as far as possible preserved.
  • the middle can be used as a guide Serve the duration of a syllable (10 - 30 ms).
  • Speech segments that fall in the order of magnitude up to 10 ms, can substitute packet loss abrupt signal changes largely avoided be when the waveform is in sync with Basic speech frequency continues, see Goodman D. J .; Lockhart G. B .; Wasem O. J; Wong W. "Waveform Substitution Techniques for Recovering Missing Speech Segments in one package Voice communications. IEEE Trans. On Acoustics, Speech and Signal Processing, Vol. ASSP-34, No. 6, Dec. 1986th In contrast to the simple repetition of the whole previous language segments are estimated Waveform by repeating the last T Samples if T is the basic speech period of the previous signal.
  • DE 44 46 558 is a digital one Transmission system with improved decoder in the receiver described.
  • the invention relates to a digital Transmission system, in particular with a mobile radio system at least one transmitter for sending code words that come from can be derived from a digital signal. If the disturbance is a Codeword recognized, the latest five samples a prediction filter not by feeding the faulty signal, but by very similar ones Samples from previous signals replaced.
  • DE 41 11 131 describes a method for Transmission of digitized sound signals known. to The disrupted signal section becomes error concealment muted or by someone disturbed, Signal section preceding signal section in the same channel or through a simultaneous undisturbed Signal section of an adjacent channel replaced.
  • the object of the invention is a part of Substitution process, but not the actual one Replacement, preventive before a loss becomes known perform and then gain time, in particular reduce packet losses due to delay and to increase the quality of the language.
  • Procedure for concealing language segment losses in packet-oriented transmission are always based on the fact that lost, incorrect or late transmitted segments or packages should be replaced so that the noticeable error is minimal.
  • the substitution takes place optionally by known methods, such as for example zero substitution, block repetition, the fundamental frequency synchronous waveform continuation or a language model-based one described in more detail below Waveform substitution.
  • the possibility of recognizing a Segment or packet loss is always provided.
  • the method according to the invention is also based on the o. a. Premises, the fundamental difference to the known method based on the consideration that Estimate the signal frame for each packet in advance to perform without already at the time of the estimate there is information about whether the next packet is received correctly or not.
  • the estimate of the Language frame of the following not yet received Parcel is done without access to secondary information exclusively on the basis of the previously received packages.
  • the method according to the invention is carried out by means of a Simulation of an ATM speech decoder implemented.
  • the functioning of the ATM decoder is on the one hand from the Information about the loss or correct receipt of the current language pack and on the other hand from the temporal Sequence of successively received or lost Language packs dependent.
  • the one for controlling the program necessary information is given to the ATM decoder a binary file and provided by the control unit evaluated. Due to the different switch positions parts of the decoder are activated or deactivated.
  • Packet reception mode In packet reception mode, the starting point is the error-free reception of the ATM cells.
  • the switching means SM1 is closed in this operating mode.
  • the received packet is decoded in the standard decoder.
  • the type of decoding is independent of the method according to the invention.
  • the output memory is used during further processing read out with the sampling frequency and the data are output.
  • the switching device SM8 is briefly status variables closed. The parameters are accepted from Encoder to the decoder. This process is only for the Case that a backward controlled coding method is used.

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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)
  • Data Exchanges In Wide-Area Networks (AREA)

Claims (6)

  1. Procédé de dissimulation de pertes de segments vocaux en transmission par paquets dans lequel des segments ou paquets égarés, erronés ou reçus en retard sont remplacés, l'évaluation de segments ou paquets égarés, erronés ou reçus en retard se faisant, au choix, selon des méthodes de substitution connues, telles que substitution zéro, répétition de blocs et maintien de forme de signal synchrone en fréquence porteuse, et la possibilité d'identification d'une perte de segment ou de paquet étant garantie, caractérisé en ce qu'il est procédé immédiatement après la réception d'un paquet (k) à une évaluation du cadre de signal du paquet suivant, non encore reçu (k + 1), sur la base du signal MIC précédemment reçu et décodé, et qu'en cas de présomption ou de constatation d'absence, de défectuosité ou de retard d'au moins un paquet (k + 1), les segments concernés ou l'ensemble du paquet (k + 1) sera immédiatement remplacé par le cadre de signal évalué sur la base du signal vocal précédemment reçu.
  2. Procédé selon la revendication 1, caractérisé en ce que l'évaluation du cadre de signal du paquet suivant, non encore reçu (k + 1), se fait selon les étapes suivantes :
    Insertion du dernier segment dans un tampon de segments pour mémorisation du dernier cadre vocal M,
    Evaluation des valeurs de balayage L du segment vocal suivant avec addition d'un surplus de longueur HOV valeurs de balayage,
    Séparation et mémorisation temporaire du surplus,
    Mémorisation du segment évalué.
  3. Procédé selon les revendications 1 et 2, caractérisé en ce que, en mode d'exploitation perte de paquet, le défaut est dissimulé à l'aide du segment précédemment évalué, la position du compteur E, indiquant le nombre des paquets successifs égarés, étant majorée d'un cran lorsque le nombre des paquets successifs égarés est inférieur à un seuil maximum déterminé E2 et en ce que
    a) pour le cas où le nombre des paquets successifs égarés est de E1≤E≤E2, E1 représentant un seuil, le segment substitué est extrait progressivement
    b) pour le cas où le nombre des paquets successifs égarés est de E=E2, un signal de bruit est généré.
  4. Procédé selon les revendications 1 et 2, caractérisé en ce que, en mode réception de paquet, le paquet reçu est décodé et en ce que
    a) pour le cas où le paquet précédent a été égaré, déclaré erroné ou n'a pas encore été reçu, le signal décodé repris est superposé par le surplus du paquet précédemment substitué, selon l'équation
    Figure 00200001
    la position du compteur E, indiquant le nombre des paquets successifs égarés, étant abaissée d'un cran lorsque le nombre des paquets successifs égarés est supérieur à 0 et en ce que
    b) pour le cas où le nombre des paquets successifs égarés est de E>E1, E1 représentant un seuil, le niveau de la transmission reprise est adapté par insertion progressive du signal décodé
  5. Procédé selon les revendications 1, 2 et 4, caractérisé en ce que, en mode réception de paquet, le paquet reçu est décodé et en ce que, si les paquets successivement reçus sont transmis sans erreur, les paquets reçus sans erreur sont émis.
  6. Procédé selon les revendications 1 et 2, caractérisé en ce que, en cas d'application d'un procédé de codage arrière, le destinataire procède à un codage du segment évalué selon les étapes suivantes :
    Initialisation des variables de statut de l'encodeur du côté du destinataire avec les variables de statut du décodeur après le décodage du dernier paquet reçu,
    Codage du segment de remplacement pour l'évaluation des variables de statut du décodeur ou de l'encodeur du côté de l'émetteur après une perte de paquet,
    Mémorisation des variables de statut évaluées, Initialisation du décodeur avec les variables de statut évaluées avant le décodage du paquet reçu après une perte de paquet, afin de réduire la divergence entre les variables de statut au niveau de l'encodeur du côté de l'émetteur et au niveau du décodeur du côté du destinataire.
EP99102364A 1998-03-26 1999-02-06 Procédé pour réduire les effets de la perte de segments de parole dans une transmission par paquets Expired - Lifetime EP0945853B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19814633A DE19814633C2 (de) 1998-03-26 1998-03-26 Verfahren zur Verschleierung von Sprachsegmentverlusten bei paketorientierter Übertragung
DE19814633 1998-03-26

Publications (3)

Publication Number Publication Date
EP0945853A2 EP0945853A2 (fr) 1999-09-29
EP0945853A3 EP0945853A3 (fr) 2000-10-11
EP0945853B1 true EP0945853B1 (fr) 2004-06-09

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EP99102364A Expired - Lifetime EP0945853B1 (fr) 1998-03-26 1999-02-06 Procédé pour réduire les effets de la perte de segments de parole dans une transmission par paquets

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EP (1) EP0945853B1 (fr)
AT (1) ATE268933T1 (fr)
DE (2) DE19814633C2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7117156B1 (en) 1999-04-19 2006-10-03 At&T Corp. Method and apparatus for performing packet loss or frame erasure concealment
KR100745387B1 (ko) * 1999-04-19 2007-08-03 에이티 앤드 티 코포레이션 패킷 손실 또는 프레임 삭제 은폐를 실행하는 방법 및 장치
US7047190B1 (en) 1999-04-19 2006-05-16 At&Tcorp. Method and apparatus for performing packet loss or frame erasure concealment
DE10116984A1 (de) * 2001-04-05 2002-10-10 Rainer Martin Verfahren und Vorrichtung zur Übertragung und Speicherung von Sprach- und Audiosignalen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4111131C2 (de) * 1991-04-06 2001-08-23 Inst Rundfunktechnik Gmbh Verfahren zum Übertragen digitalisierter Tonsignale
US5615298A (en) * 1994-03-14 1997-03-25 Lucent Technologies Inc. Excitation signal synthesis during frame erasure or packet loss
DE4446558A1 (de) * 1994-12-24 1996-06-27 Philips Patentverwaltung Digitales Übertragungssystem mit verbessertem Decoder im Empfänger
FI950917A (fi) * 1995-02-28 1996-08-29 Nokia Telecommunications Oy Puhekoodausparametrien käsittely tietoliikennejärjestelmässä

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Publication number Publication date
DE59909668D1 (de) 2004-07-15
DE19814633A1 (de) 1999-09-30
DE19814633C2 (de) 2001-09-13
EP0945853A2 (fr) 1999-09-29
EP0945853A3 (fr) 2000-10-11
ATE268933T1 (de) 2004-06-15

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