EP0609325A1 - Method of transmitting digitized stereophonic sound signals over radio channels subject to interference. - Google Patents

Method of transmitting digitized stereophonic sound signals over radio channels subject to interference.

Info

Publication number
EP0609325A1
EP0609325A1 EP92921998A EP92921998A EP0609325A1 EP 0609325 A1 EP0609325 A1 EP 0609325A1 EP 92921998 A EP92921998 A EP 92921998A EP 92921998 A EP92921998 A EP 92921998A EP 0609325 A1 EP0609325 A1 EP 0609325A1
Authority
EP
European Patent Office
Prior art keywords
decoder
strategy
computing power
sound signals
interference
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
EP92921998A
Other languages
German (de)
French (fr)
Other versions
EP0609325B1 (en
Inventor
Georg Plenge
Detlef Wiese
Gerhard Stoll
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.)
Institut fuer Rundfunktechnik GmbH
Original Assignee
Institut fuer Rundfunktechnik GmbH
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 Institut fuer Rundfunktechnik GmbH filed Critical Institut fuer Rundfunktechnik GmbH
Publication of EP0609325A1 publication Critical patent/EP0609325A1/en
Application granted granted Critical
Publication of EP0609325B1 publication Critical patent/EP0609325B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/86—Arrangements characterised by the broadcast information itself
    • H04H20/88—Stereophonic broadcast systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H04H40/36—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving

Definitions

  • the invention relates to a method according to the preamble of claim 1. Such a method is known for example from DE 36 38 922 A1.
  • the object of the invention is therefore to provide a method which essentially shifts the computing power required in the decoder into the encoder and thus enables simple, cheap decoder implementation.
  • Figure 1 is a block diagram of an encoder
  • Figure 2 is a block diagram of a decoder for performing the method according to the invention.
  • the two signals 2 ⁇ and a R of a digital stereophonic signal pair are fed to a standard conversion stage 11 and, if necessary, their bit rates are reduced (the method also works with signals that are not reduced in bit rate).
  • the resulting signals are then subjected to channel coding in a channel coding stage 12.
  • One of the two signals is advantageously delayed (see DE 36 38 922 AI).
  • the two signals are subjected to an analysis for determining the strategy in a stage 13.
  • the parameters of the stereophonic signal pairs are determined, which can be important for different concealment strategies. These include, for example:
  • the analysis stage 13 creates the optimal strategy for these disturbances for different possible signal disturbances after channel coding and decoding.
  • the disturbances can be, for example: a) Short-term signal failure in one or both signals of the signal pair either in the entire frequency range or only in partial areas b) Multiple short-term failure in accordance with paragraph a) above, either at regular intervals ("picket fence effect") or at irregular intervals c) Long-term failures d) Mixed forms.
  • the strategy recommendations for an error concealment or a change in the channel coding can be:
  • the envisaged error concealment techniques are typed.
  • the information from the analysis stage 13 is then the specification of several types, of which one type in each case is applicable to a likewise typical channel interference with a corresponding residual bit error structure.
  • This information (ZiST) will transmitted to the decoder together with the sound data via a multiplexer 14 or separately from the sound data.
  • the incoming total signal is separated into its components, if necessary by means of a demultiplexer 21.
  • the signal components a ' L and a' R are channel-decoded in a decoding and residual error detection stage 22 and examined for possible residual errors.
  • the function block "strategy selection" 23 instructs the use of concealment to be carried out in concealment stages 24.
  • the invention is not restricted to a two-channel stereophonic coding, but can also be used for multiple, arbitrary stereophonic coding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

In order to transmit digitized stereophonic sound signals over channels, in particular radio channels, subject to interference, the invention proposes that transmission errors are detected at the decoder end and, if necessary, corrected or screened out. Most of the computer calculations necessary for the correction or screening out of the errors are carried out at the encoder end. The result of the computer calculations is transmitted in coded form as supplementary information to the decoder, which uses the transmitted result in the correction or screening out of errors.

Description

Verfahren zum Übertragen digitalisierter, stereofoner Tonsignale über störbehaftete Rundfunkkanäle Process for the transmission of digitized, stereophonic sound signals over radio channels with interference
BESCHREIBUNGDESCRIPTION
Die Erfindung bezieht sich auf ein Verfahren gemäß dem Oberbegriff des Patentanspruch 1. Ein derartiges Verfahren ist beispielsweise aus der DE 36 38 922 A 1 bekannt.The invention relates to a method according to the preamble of claim 1. Such a method is known for example from DE 36 38 922 A1.
Bei digitalen sterofonen Tonsignalübertragungen muß in dem Decoder eine relativ hohe Rechenleistung vorgesehen werden, um Verschleierungsstrategien möglichst optimal anwenden zu können. Beispiele für derartige Verschleierungsstrategien sind in der DE-OS 36 38 922 beschrieben. Da die Installation einer hohen Rechenleistung den Decoder erheblich verteuert, besteht insbesondere bei möglichst einfach und billig auszuführenden Geräten der Unterhaltungselektronik der Wunsch, den Decoder von derartigen Rechenleistungen möglichst zu entlasten.In the case of digital stereophonic audio signal transmissions, a relatively high computing power must be provided in the decoder in order to be able to use concealment strategies as optimally as possible. Examples of such concealment strategies are described in DE-OS 36 38 922. Since the installation of high computing power makes the decoder considerably more expensive, there is a desire in particular to relieve the decoder of such computing power as easily and cheaply as possible from entertainment electronics devices.
Die Aufgabe der Erfindung besteht somit darin, ein Verfahren anzugeben, welches die im Decoder erforderliche Rechenleistung im wesentlichen in den Encoder verlagert und damit eine einfache, billige Decoderrealisierung ermöglicht.The object of the invention is therefore to provide a method which essentially shifts the computing power required in the decoder into the encoder and thus enables simple, cheap decoder implementation.
Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen des erfindungsgemäßen Verfahrens ergeben sich aus den Unteransprüchen.This object is achieved by the characterizing features of claim 1. Advantageous refinements and developments of the method according to the invention result from the subclaims.
Die Erfindung wird anhand der Zeichnung näher erläutert. Es zeigt:The invention is explained in more detail with reference to the drawing. It shows:
Figur 1 ein Blockschaltbild eines Encoders undFigure 1 is a block diagram of an encoder and
Figur 2 ein Blockschaltbild eines Decoders zur Durchführung des erfindungsgemäßen Verfahrens.Figure 2 is a block diagram of a decoder for performing the method according to the invention.
Bei dem in Figur 1 dargestellten Encoder werden die beiden Signale 2^ und aR eines digitalen stereofonen Signalpaares einer Normwandlungsstufe 11 zugeführt und ggf. in ihren Bitraten reduziert (das Verfahren arbeitet auch mit Signalen, die nicht bitratenreduziert sind). Die resultierenden Signale werden anschließend in einer Kanalcodierungsstufe 12 einer Kanalcodierung unterzogen. Eines der beiden Signale wird vorteilhaft (sh. DE 36 38 922 AI) verzögert. Die beiden Signale werden parallel dazu in einer Stufe 13 einer Analyse zur Strategieermittlung unterzogen. In dieser Analysestufe 13 werden die Parameter der stereofonen Signalpaare ermittelt, die für verschiedene Verschleierungsstrategien wichtig sein können. Dazu zählen z.B.:In the encoder shown in FIG. 1, the two signals 2 ^ and a R of a digital stereophonic signal pair are fed to a standard conversion stage 11 and, if necessary, their bit rates are reduced (the method also works with signals that are not reduced in bit rate). The resulting signals are then subjected to channel coding in a channel coding stage 12. One of the two signals is advantageously delayed (see DE 36 38 922 AI). In parallel, the two signals are subjected to an analysis for determining the strategy in a stage 13. In this analysis stage 13, the parameters of the stereophonic signal pairs are determined, which can be important for different concealment strategies. These include, for example:
FrequenzgangFrequency response
ImpulshaltigkeitImpulsiveness
Korrelationsgrad zwischen aL und aR Degree of correlation between a L and a R
Pegelverhältnisse etc.Level ratios etc.
Die Analysestufe 13 erstellt für verschiedene mögliche Signalstörungen nach einer Kanalcodierung und -decodierung die für diese Störungen jeweils optimale Strategie. Die Störungen können z.B. sein: a) Kurzzeitiger Signalausfall in einem oder beiden Signalen des Signalpaares entweder im gesamten Frequenzbereich oder nur in Teilbereichen b) mehrfacher kurzzeitiger Ausfall gemäß vorstehender Ziffer a) entweder in regelmäßigen Abständen ("Lattenzauneffekt") oder in unregelmäßigen Abständen c) langzeitige Ausfälle d) Mischformen.The analysis stage 13 creates the optimal strategy for these disturbances for different possible signal disturbances after channel coding and decoding. The disturbances can be, for example: a) Short-term signal failure in one or both signals of the signal pair either in the entire frequency range or only in partial areas b) Multiple short-term failure in accordance with paragraph a) above, either at regular intervals ("picket fence effect") or at irregular intervals c) Long-term failures d) Mixed forms.
Die Strategieempfehlungen für eine Fehlerverschleierung oder einen Wechsel in der Kanalcodierung können sein:The strategy recommendations for an error concealment or a change in the channel coding can be:
e) Signalwiederholung mit Angabe der günstigsten Zeitpunkte für Beginn und Ende des einzufügenden Signalabschnittes; f) Ersatz eines über längere Zeit ausgefallenen Signalabschnittes durch ein anderes Signal des stereofonen Signals (Links/Rechtsersatz bei 2- Kanalstereofonie) mit Angabe der günstigsten Zeitpunkte für Beginn und Ende des Signalaustausches; g) Teilweiser Signalersatz (nur in bestimmten Frequenzbereichen des Gesamtsignals) nach vorstehender Ziffer a) oder b); h) Wechsel von Fehlererkennung und Fehlerkorrektur zu reiner Fehlererkennung und Fehlerverschleierung bei der Kanaldecodierung.e) signal repetition specifying the best times for the beginning and end of the signal section to be inserted; f) replacement of a signal section that has been out of use for a longer period of time with another signal of the stereophonic signal (left / right substitution in the case of 2-channel stereo) with indication of the most favorable times for the beginning and end of the signal exchange; g) Partial signal replacement (only in certain frequency ranges of the overall signal) according to item a) or b) above; h) Change from error detection and error correction to pure error detection and error concealment during channel decoding.
Die in Aussicht genommenen Fehlerverschleierungstechniken werden typisiert. Die Information aus der Analysestufe 13 ist dann die Angabe mehrerer Typen, von denen jeweils ein Typ für eine ebenfalls typische Kanalstörung mit entsprechender Bitfehlerreststruktur zutreffend ist. Diese Information (ZiST) wird zusammen mit den Tondaten über einen Multiplexer 14 oder getrennt von den Tondaten dem Decoder übermittelt.The envisaged error concealment techniques are typed. The information from the analysis stage 13 is then the specification of several types, of which one type in each case is applicable to a likewise typical channel interference with a corresponding residual bit error structure. This information (ZiST) will transmitted to the decoder together with the sound data via a multiplexer 14 or separately from the sound data.
Bei dem in Figur 2 dargestellten Decoder wird das eintreffende Gesamtsignal ggf. mittels eines DemuMplexers 21 in seine Bestandteile getrennt. Die Signalanteile a'L und a'R werden in einer Decodier- und Restfehlererkennungs- stufe 22 kanaldecodiert und auf mögliche Restfehler untersucht. Aus den Informationen "Bitfehlerreststruktur" (Ausgang von 22) und "Strategie¬ empfehlungen" (Ausgang Demultiplexer 21) erfolgt im Funktionsbaustein "Strategieauswahl" 23 die Anweisung über die Anwendung der in den Verschleierungsstufen 24 vorzunehmenden Verschleierung (Concealment).In the decoder shown in FIG. 2, the incoming total signal is separated into its components, if necessary by means of a demultiplexer 21. The signal components a ' L and a' R are channel-decoded in a decoding and residual error detection stage 22 and examined for possible residual errors. From the information "bit error residual structure" (output from 22) and "strategy recommendations" (output from demultiplexer 21), the function block "strategy selection" 23 instructs the use of concealment to be carried out in concealment stages 24.
Die Erfindung ist nicht auf eine zweikanalige Stereofoniecodierung beschränkt, sondern kann auch für mehrmalige, beliebige Stereofoniecodierung angewandt werden. The invention is not restricted to a two-channel stereophonic coding, but can also be used for multiple, arbitrary stereophonic coding.

Claims

VERFAHREN ZUM ÜBERTRAGEN DIGITALISIERTER, STEREOFONER TONSIGNALE ÜBER STÖRBEHAFTETE RUNDFUNKKANÄLEPATENTANSPRÜCHE METHOD FOR TRANSMITTING DIGITIZED STEREOFONER SOUND SIGNALS THROUGH INTERFERING BROADCAST CHANNEL PATENT CLAIMS
1. Verfahren zum Übertragen digitalisierter, stereofoner Tonsignale über störbehaftete Kanäle, insbesondere Rundfunkkanäle, bei dem decoderseitig Übertragungsfehler detektiert und gegebenenfalls korrigiert oder verschleiert werden, dadurch gekennzeichnet, daß die für die Fehlerkorrektur bzw. Fehlerverschleierung notwendige Rechenleistung weitgehend encoderseitig erbracht wird und daß das Ergebnis dieser Rechenleistung in codierter Form als eine zusätzliche Information dem Decoder übermittelt wird, welcher das übermittelte Ergebnis der Rechenleistung für die Fehlerkorrektur bzw. Fehlerverschleierung verwendet.1. A method for transmitting digitized, stereophonic audio signals via interference-prone channels, in particular radio channels, in which transmission errors are detected on the decoder side and, if necessary, corrected or obscured, characterized in that the computing power required for error correction or error concealment is largely provided on the encoder side and that the result of this Computing power is transmitted in coded form as additional information to the decoder, which uses the transmitted result of the computing power for error correction or concealment.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Rechenleistung in der Auswahl der für den Einzelfall anzuwendenden Fehlerkorrektur- bzw. Fehlerverschleierungsstrategie liegt, wobei Kriterien für anzuwendende Strategien die Struktur des momentanen Tonsignals sowie Häufigkeit, Zeitdauer und Struktur möglicher Signalausfälle sind, und daß der Decoder aufgrund der von ihm festgestellten Signalausfälle die vom Encoder momentan empfohlene Strategie anwendet.2. The method according to claim 1, characterized in that the computing power lies in the selection of the error correction or error concealment strategy to be used for the individual case, the criteria for the strategies to be used being the structure of the current one Tone signal as well as frequency, duration and structure of possible signal failures, and that the decoder uses the strategy currently recommended by the encoder due to the signal failures it has detected.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die anzuwendenden Strategien typisiert werden, die Strategietypen im Decoder gespeichert sind und daß der Encoder lediglich Informationen über die Auswahl des anzuwendenden Strategietyps übermittelt, welche in dem Decoder zur Adressierung des betreffenden, gespeicherten Strategietyps verwendet werden. 3. The method according to claim 1 or 2, characterized in that the strategies to be used are typed, the strategy types are stored in the decoder and that the encoder only transmits information about the selection of the strategy type to be used, which in the decoder for addressing the relevant, stored strategy type be used.
EP92921998A 1991-10-23 1992-10-20 Method of transmitting digitized stereophonic sound signals over radio channels subject to interference Expired - Lifetime EP0609325B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4135005 1991-10-23
DE4135005A DE4135005A1 (en) 1991-10-23 1991-10-23 METHOD FOR TRANSMITTING DIGITIZED, STEREOFONER SOUND SIGNALS OVER BROADCASTING CHANNELS
PCT/EP1992/002402 WO1993008657A1 (en) 1991-10-23 1992-10-20 Method of transmitting digitized stereophonic sound signals over radio channels subject to interference

Publications (2)

Publication Number Publication Date
EP0609325A1 true EP0609325A1 (en) 1994-08-10
EP0609325B1 EP0609325B1 (en) 1997-03-19

Family

ID=6443266

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92921998A Expired - Lifetime EP0609325B1 (en) 1991-10-23 1992-10-20 Method of transmitting digitized stereophonic sound signals over radio channels subject to interference

Country Status (8)

Country Link
EP (1) EP0609325B1 (en)
AT (1) ATE150604T1 (en)
AU (1) AU2772692A (en)
CA (1) CA2122010A1 (en)
DE (2) DE4135005A1 (en)
DK (1) DK0609325T3 (en)
ES (1) ES2099285T3 (en)
WO (1) WO1993008657A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4335305A1 (en) * 1993-10-16 1995-04-20 Philips Patentverwaltung Method and circuit arrangement for transmitting voice signals
DE19925843B4 (en) * 1999-06-01 2005-01-27 Andreas Hilse A method and apparatus for generating an acoustic signal volume and an acoustic signal volume

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3344204A1 (en) * 1983-12-07 1985-06-20 Philips Kommunikations Industrie AG, 8500 Nürnberg Multiplex method for transmitting high-quality digitised stereo sound signals
DE3638922A1 (en) * 1986-11-14 1988-05-26 Inst Rundfunktechnik Gmbh Method for transmitting digitised stereophonic audio signals
JP3018366B2 (en) * 1989-02-08 2000-03-13 ソニー株式会社 Video signal processing circuit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9308657A1 *

Also Published As

Publication number Publication date
DE59208252D1 (en) 1997-04-24
EP0609325B1 (en) 1997-03-19
AU2772692A (en) 1993-05-21
CA2122010A1 (en) 1993-04-29
ATE150604T1 (en) 1997-04-15
DE4135005A1 (en) 1993-04-29
DK0609325T3 (en) 1997-06-09
WO1993008657A1 (en) 1993-04-29
ES2099285T3 (en) 1997-05-16

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