EP0945853A2 - 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
EP0945853A2
EP0945853A2 EP99102364A EP99102364A EP0945853A2 EP 0945853 A2 EP0945853 A2 EP 0945853A2 EP 99102364 A EP99102364 A EP 99102364A EP 99102364 A EP99102364 A EP 99102364A EP 0945853 A2 EP0945853 A2 EP 0945853A2
Authority
EP
European Patent Office
Prior art keywords
packet
segment
received
packets
lost
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
Application number
EP99102364A
Other languages
German (de)
English (en)
Other versions
EP0945853A3 (fr
EP0945853B1 (fr
Inventor
Steffen Dipl.-Ing. Schönfuss
Rolf Dr. Kapust
Klaus-Dieter Dipl.-Ing. Michael
Peter Prof. Dr.-Ing. Noll
Christian Dipl.-Ing. Günther
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Telekom AG
Original Assignee
Deutsche Telekom AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Deutsche Telekom AG filed Critical Deutsche Telekom AG
Publication of EP0945853A2 publication Critical patent/EP0945853A2/fr
Publication of EP0945853A3 publication Critical patent/EP0945853A3/fr
Application granted granted Critical
Publication of EP0945853B1 publication Critical patent/EP0945853B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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 speech packets are substituted by simply replacing the samples of the missing packet with zero amplitudes or by selecting the code words so that the zero amplitudes result after decoding.
  • Jayant NS Christensen SW Effects of Packet Losses in Waveform Coded Speech and Improvements Due to an ODD-Even Sample-Interpolation Procedure. IEEE Trans. On Communications, Vol. Com-29, No. 2 February 1981
  • Another known substitution procedure is the packet retry procedure.
  • the lost speech segments are concealed by repeated output of the samples or code words received in the immediately preceding packet.
  • the simple packet repetition as with Wasem OJ; Goodman, DJ; Dvorak CA; Page HG in The Effect of Waveform Substitution on the Quality of PCM Packet Communications "IEEE Trans. On Acoustics, Speech and Signal Processing, Vol. 36, No. 3 March 1988 has the advantage that, with the exception of the storage of the last received packet and the With all substitution methods, the detection of a packet loss, which is required, requires no computational effort to replace the lost speech segment.
  • a disadvantage of this method is that, as a rule, however, discontinuities occur both at the borders between the previous and the substituted speech signal and during the transition to the following segment In relation to zero substitution, the packet repetition achieves a maximum tolerable packet loss rate which is about 2.5 times larger.
  • a substitution method which is referred to as fundamental frequency synchronous waveform replacement. This method is based on the assumption that the speech signal statistics change only slightly in successive packets and that the signal form, particularly in the case of voiced sounds, is largely retained for the preceding and the following packet.
  • the average duration of a syllable (10 - 30 ms) can serve as a guide. For relatively short speech segments, which fall in the order of magnitude of up to 10 ms, sudden substitution of signals can largely be avoided if packet losses are substituted if the signal progression is continued in synchronization with the fundamental speech frequency, see Goodman DJ; Lockhart GB; Wasem O. J; Wong W. Waveform Substitution Techniques for Recovering Missing Speech Segments in Voice Communications package.
  • 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.
  • 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 delay-related packet losses and to increase the quality of the language.
  • the method according to the invention is also based on the above-mentioned premises, the fundamental difference from the known methods being based on the consideration of carrying out the estimation of the signal frame for each packet in advance, without there being any information at the time of the estimation as to whether the next packet is received correctly or not.
  • the speech frame of the subsequent packet that has not yet been received is estimated without access to secondary information exclusively on the basis of the packets previously received.
  • 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 in the form 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.

Landscapes

  • 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)
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
DE19814633 1998-03-26
DE19814633A DE19814633C2 (de) 1998-03-26 1998-03-26 Verfahren zur Verschleierung von Sprachsegmentverlusten bei paketorientierter Übertragung

Publications (3)

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

Family

ID=7863265

Family Applications (1)

Application Number Title Priority Date Filing Date
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

Country Status (3)

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000063881A1 (fr) * 1999-04-19 2000-10-26 At & T Corp. Procede et appareil permettant de realiser un masquage de perte de paquets ou d'effacement de trame
US8185386B2 (en) 1999-04-19 2012-05-22 At&T Intellectual Property Ii, L.P. Method and apparatus for performing packet loss or frame erasure concealment
US8731908B2 (en) 1999-04-19 2014-05-20 At&T Intellectual Property Ii, L.P. Method and apparatus for performing packet loss or frame erasure concealment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10116984A1 (de) * 2001-04-05 2002-10-10 Rainer Martin Verfahren und Vorrichtung zur Übertragung und Speicherung von Sprach- und Audiosignalen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4111131A1 (de) * 1991-04-06 1992-10-08 Inst Rundfunktechnik Gmbh Verfahren zum uebertragen digitalisierter tonsignale
EP0673017A2 (fr) * 1994-03-14 1995-09-20 AT&T Corp. Synthèse de signal d'excitation en cas d'effacement des trames ou de perte des paquets de données
DE4446558A1 (de) * 1994-12-24 1996-06-27 Philips Patentverwaltung Digitales Übertragungssystem mit verbessertem Decoder im Empfänger
WO1996027183A2 (fr) * 1995-02-28 1996-09-06 Nokia Telecommunications Oy Traitement de parametres de codage vocal dans un systeme de telecommunication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4111131A1 (de) * 1991-04-06 1992-10-08 Inst Rundfunktechnik Gmbh Verfahren zum uebertragen digitalisierter tonsignale
EP0673017A2 (fr) * 1994-03-14 1995-09-20 AT&T Corp. Synthèse de signal d'excitation en cas d'effacement des trames ou de perte des paquets de données
DE4446558A1 (de) * 1994-12-24 1996-06-27 Philips Patentverwaltung Digitales Übertragungssystem mit verbessertem Decoder im Empfänger
WO1996027183A2 (fr) * 1995-02-28 1996-09-06 Nokia Telecommunications Oy Traitement de parametres de codage vocal dans un systeme de telecommunication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SUZUKI J ET AL: "MISSING PACKET RECOVERY TECHNIQUES FOR LOW-BIT-RATE CODED SPEECH" IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS,US,IEEE INC. NEW YORK, Bd. 7, Nr. 5, 1. Juni 1989 (1989-06-01), Seiten 707-717, XP002032886 ISSN: 0733-8716 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000063881A1 (fr) * 1999-04-19 2000-10-26 At & T Corp. Procede et appareil permettant de realiser un masquage de perte de paquets ou d'effacement de trame
US8185386B2 (en) 1999-04-19 2012-05-22 At&T Intellectual Property Ii, L.P. Method and apparatus for performing packet loss or frame erasure concealment
US8423358B2 (en) 1999-04-19 2013-04-16 At&T Intellectual Property Ii, L.P. Method and apparatus for performing packet loss or frame erasure concealment
US8612241B2 (en) 1999-04-19 2013-12-17 At&T Intellectual Property Ii, L.P. Method and apparatus for performing packet loss or frame erasure concealment
US8731908B2 (en) 1999-04-19 2014-05-20 At&T Intellectual Property Ii, L.P. Method and apparatus for performing packet loss or frame erasure concealment
US9336783B2 (en) 1999-04-19 2016-05-10 At&T Intellectual Property Ii, L.P. Method and apparatus for performing packet loss or frame erasure concealment

Also Published As

Publication number Publication date
DE19814633A1 (de) 1999-09-30
ATE268933T1 (de) 2004-06-15
EP0945853A3 (fr) 2000-10-11
DE19814633C2 (de) 2001-09-13
DE59909668D1 (de) 2004-07-15
EP0945853B1 (fr) 2004-06-09

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