EP0609300A1 - Process for transmitting or storing over disturbed channels a digitalized, encoded audio signal composed of a series of information blocks. - Google Patents

Process for transmitting or storing over disturbed channels a digitalized, encoded audio signal composed of a series of information blocks.

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Publication number
EP0609300A1
EP0609300A1 EP92921545A EP92921545A EP0609300A1 EP 0609300 A1 EP0609300 A1 EP 0609300A1 EP 92921545 A EP92921545 A EP 92921545A EP 92921545 A EP92921545 A EP 92921545A EP 0609300 A1 EP0609300 A1 EP 0609300A1
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EP
European Patent Office
Prior art keywords
information
units
encoded
error protection
audio signal
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Granted
Application number
EP92921545A
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German (de)
French (fr)
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EP0609300B1 (en
Inventor
Detlef Wiese
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Institut fuer Rundfunktechnik GmbH
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Institut fuer Rundfunktechnik GmbH
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Publication of EP0609300A1 publication Critical patent/EP0609300A1/en
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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
    • H04H20/95—Arrangements characterised by the broadcast information itself characterised by a specific format, e.g. an encoded audio stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/02—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information
    • H04H60/07—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation

Definitions

  • the invention relates to a ner driving according to the preamble of claim 1.
  • a ner driving is known from the earlier patent application P 41 11 131.1.
  • bit-saving source codes are usually used before the channel coding, which are based on a reduction in redundancy and irrelevance.
  • the digitally sampled audio signal is processed using a filter bank
  • sampled values 25 subband samples and / or converted to spectral samples using a frequency domain transform.
  • additional and control information such as, for example, scale factors, scale factor selection information and bit allocation information
  • Binary digits within an information block produce a different subjective interference effect on the listener.
  • the disruption of a bit assignment in the radio channel can briefly lead to a complete failure on the playback side and thus to a muting of the audio signal of a certain duration.
  • This control information must therefore be protected considerably more than the encoded samples.
  • the listener can only perceive a bit error of a small binary position of the encoded sample with difficulty and sometimes even not at all.
  • the object of the invention is to provide, in a method of the type mentioned at the outset, a channel coding which is optimized with regard to minimal subjective interference, minimum data rate and maximum error protection.
  • the invention is based on the consideration of using the different meaning of the information units within each information block for a continuously graduated, variable error protection in such a way that certain interference patterns result from transmission disturbances, which can be determined by suitable ones
  • Fig. 1 is a schematic representation of a in the invention
  • Method used information block which consists of a sequence of nine information units with different error protection
  • Fig. 2 is a schematic representation similar to that in Fig. 1 for a alternative embodiment
  • FIG. 3 shows a schematic representation of the two channels of a stereophonic audio signal which is channel-coded according to the inventive method according to FIG. 2 after channel decoding.
  • a sub-band method is used as the source coding method, in which the frequency band of the digitized audio signal is split into a plurality of sub-bands. Each subband is assigned to one of six subband groups. The bit allocation and thus data reduction of the sample values of each subband is carried out according to psychoacoustic aspects (monitoring threshold calculation). The peak value of the amount of these samples is determined in each sub-band for a certain number of consecutive samples and is quantified as a so-called "scale factor" and recorded together with the data-reduced ones
  • Such a data-reduced, channel-coded audio signal 1 is shown schematically in the figure and consists of a large number of successive information blocks 10.
  • the information blocks 10 are preferably of the same length and each comprise a sequence of nine information units 11 to 19 in the example shown.
  • the nine information units 11 to 19 contain the following information in accordance with the source coding scheme under consideration: Unit 11 bit allocation information
  • Unit 12 scale factor selection information
  • the individual information units 11 to 19 are assigned a varying bit error protection 21 to 29 during the channel coding.
  • the bit allocation information 11 and the scale factor selection information 12 require a high level of error protection 21 and 22, respectively, since bit errors within these information units can lead to a complete destruction of the audio signal at the output of the source decoder. Since disrupted scale factors 13 subjectively are extremely disruptive, they also require a relatively high level of error protection 23.
  • Subband groups No. 1 to No. 6, which are shown as information units 14 to 19, are treated differently with regard to their error protection 24 to 29.
  • the subband samples of the subbands of the lower frequency range are in the information unit 14, those of the highest frequency range to be transmitted are in the information unit 19.
  • FIG. 2 An application of this better error detection is shown in FIG. 2 using a two-channel, stereophonic audio signal. In each of the two channels No. 1 and No. 2, three successive information blocks 110, 120, 130 and 210, 220, 230 are illustrated. Each of these blocks, as shown for block 10 in FIG. 1, consists of nine information units.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Error Detection And Correction (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

PCT No. PCT/EP92/02401 Sec. 371 Date Apr. 20, 1994 Sec. 102(e) Date Apr. 20, 1994 PCT Filed Oct. 20, 1992 PCT Pub. No. WO93/08656 PCT Pub. Date Apr. 29, 1993.Digitalized encoded audio signals for transmission over disturbed channels are composed of a series of information blocks made of information units containing various types of information, such as control information, scale factor information and information on encoded scanning values derived from partial-band and/or transformation coding at the source. The units of information concerning the encoded scanning values are allocated to a predetermined spectral structure. Before its transmission or storage, the encoded audio signal is subjected to a channel encoding dependent on the desired error protection. When errors are recognized, they are corrected, and when the errors cannot be corrected, they are concealed. For the channel encoding of the units of information concerning the encoded scanning values, a variable bit error protection is provided depending on the allocation of the individual information unit to a determined spectral structure, i.e., units of information concerning the encoded scanning values of lower frequency audio signal fractions are given a higher bit error protection than units of information concerning the encoded scanning values of higher frequency audio signal fractions. The variable error protection to be selected for the individual information units is further determined depending on the admissible duration and frequency, according to subjective criteria, of the applied error concealment.

Description

Verfahren zum übertragen oder Speichern eines aus einer Folge von Informationsblöcken bestehenden digitalisierten, encodierten Tonsignals über störbehaftete Kanäle Method for transmitting or storing a digitized, encoded audio signal consisting of a sequence of information blocks via interference-prone channels
BESCHREIBUNGDESCRIPTION
Die Erfindung bezieht sich auf ein Nerfahren gemäß dem Oberbegriff des Patentanspruchs 1. Ein derartiges Nerfahren ist aus der älteren Patentanmeldung P 41 11 131.1 bekannt.The invention relates to a ner driving according to the preamble of claim 1. Such a ner driving is known from the earlier patent application P 41 11 131.1.
Zum Übertragen digital codierter Tonsignale über Rundfunkkanäle oder andere störbehaftete Kanäle wird ein relativ hoher Bit-Fehlerschutz sendeseitig angestrebt, um auch einen Empfang unter schlechten Übertragungsbedingungen, beispielsweise durch Abschattungen bei mobilem Empfang, zu gewährleisten. Dies erfordert eine entsprechend hohe Redundanz der zu übertragendenIn order to transmit digitally coded audio signals via radio channels or other interference-prone channels, a relatively high bit error protection is sought on the transmission side in order to also ensure reception under poor transmission conditions, for example by shadowing in the case of mobile reception. This requires a correspondingly high level of redundancy for the data to be transmitted
20 Binärstellen des digital codierten Signals, was mit hohen Datenraten verbunden ist. Zur Verringerung der Datenrate werden meist vor der Kanalcodierung bitsparende Quellencodierungen eingesetzt, welche auf einer Redundanz- und Irrelevanz-Verringerung beruhen. Bei solchen bitsparenden Quellcodierungen wird das digital abgetastete Tonsignal unter Verwendung einer Filterbank in20 binary digits of the digitally encoded signal, which is associated with high data rates. To reduce the data rate, bit-saving source codes are usually used before the channel coding, which are based on a reduction in redundancy and irrelevance. With such bit-saving source encodings, the digitally sampled audio signal is processed using a filter bank
25 Teilband-Abtastwerte und/oder unter Verwendung einer Transformation in den Frequenzbereich in spektrale Abtastwerte umgesetzt. Zusätzlich zu den Abtastwerten werden Zusatz- und Steuerinformationen, wie beispielsweise Skalenfaktoren, Skalenfaktor-Selektierungsinformationen und Bitzuweisungs¬25 subband samples and / or converted to spectral samples using a frequency domain transform. In addition to the sampled values, additional and control information, such as, for example, scale factors, scale factor selection information and bit allocation information
•30 informationen übertragen, d.h. , es müssen aufeinanderfolgende Informationseinheiten unterschiedlichen Inhaltes übertragen werden, wobei eine Folge solcher Informationseinheiten zu einem Informationsblock (auch "Informationsrahmen" genannt) zusammengefaßt ist. Bit-Fehler einzelnen • 30 information is transmitted, ie successive information units of different content must be transmitted, a sequence of such information units being combined to form an information block (also called an “information frame”). Bit error individual
35 - Z35 - Z
Binärstellen innerhalb eines Informationsblockes erzeugen eine unterschiedlich subjektive Störwirkung beim Hörer. So kann beispielsweise die Störung einer Bit- Zuweisung im Rundfunkkanal kurzzeitig zu einem völligen Ausfall auf der Wiedergabeseite und damit zu einer Stummschaltung des Tonsignals von einer bestimmten Dauer fuhren. Diese Steuerinformationen müssen deshalb erheblich stärker geschützt werden als die encodierten Abtastwerte. Für den Fehlerschutz der encodierten Abtastwerte gilt, daß ein Bitfehler einer geringwertigen Binärstelle des encodierten Abtastwertes vom Hörer nur schwer und manchmal sogar überhaupt nicht wahrgenommen werden kann.Binary digits within an information block produce a different subjective interference effect on the listener. For example, the disruption of a bit assignment in the radio channel can briefly lead to a complete failure on the playback side and thus to a muting of the audio signal of a certain duration. This control information must therefore be protected considerably more than the encoded samples. For the error protection of the encoded samples, the listener can only perceive a bit error of a small binary position of the encoded sample with difficulty and sometimes even not at all.
Aus der DE 38 05 169 C2 ist es bekannt, einen variablen Bitfehlerschutz vorzusehen, welcher an die variierende Bedeutung der einzelnen Binärstellen jedes Informationsblockes angepaßt wird. Im Falle von zunehmend schlechter werdenden Übertragungsbedingungen sind zunächst die weniger wichtigen Binärstellen des Informationsblockes gestört, da diese Binärstellen einen geringeren Fehlerschutz erhalten als die höherwertigen Binärstellen. Mit zunehmend schlechter werdenden Übertragungsbedingungen werden immer wichtigere Binärstellen gestört, wobei die subjektive Störwirkung mit "wahrnehmbar", "leicht störend" bis hin zu "unangenehm störend" beschrieben werden kann. Dabei wird davon ausgegangen, daß nur eine Fehlerkorrektur der empfangenen, encodierten Tonsignaldaten möglich ist, nicht dagegen eine Fehlerverschleierung, so daß relativ große subjektive Störwirkungen auftreten können.From DE 38 05 169 C2 it is known to provide variable bit error protection which is adapted to the varying meaning of the individual binary positions of each information block. In the event of increasingly poor transmission conditions, the less important binary digits of the information block are initially disturbed, since these binary digits receive less error protection than the higher-order binary digits. With increasingly poor transmission conditions, more and more important binary digits are disturbed, whereby the subjective interference effect can be described as "perceptible", "slightly disturbing" up to "unpleasantly disturbing". It is assumed that only an error correction of the received, encoded audio signal data is possible, but not an error concealment, so that relatively large subjective interference effects can occur.
Aus der älteren Patentanmeldung P 41 11 131.1 ist es bekannt, gestörte Teilbänder oder Spektralwerte gezielt zu verschleiern und dadurch die subjektive Störwirkung herabzusetzen. Die Aufgabe der Erfindung besteht darin, bei einem Verfahren der eingangs erwähnten Art eine Kanalcodierung anzugeben, welche hinsichtlich minimaler subjektiver Störwirkung, minimaler Datenrate und maximalem Fehlerschutz optimiert ist.From the earlier patent application P 41 11 131.1 it is known to specifically disguise disturbed sub-bands or spectral values and thereby to reduce the subjective interference effect. The object of the invention is to provide, in a method of the type mentioned at the outset, a channel coding which is optimized with regard to minimal subjective interference, minimum data rate and maximum error protection.
Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst.This object is achieved by the characterizing features of claim 1.
Vorteilhafte Weiterbildungen des erfindungsgemäßen Verfahrens ergeben sich aus den Unteransprüchen.Advantageous developments of the method according to the invention result from the subclaims.
Die Erfindung beruht auf der Überlegung, die unterschiedliche Bedeutung der Informationseinheiten innerhalb jedes Informationsblockes derart für einen kontinuierlich abgestuften, variablen Fehlerschutz auszunutzen, daß sich bei Übertragungsstörungen bestimmte Störmuster ergeben, die sich durch geeigneteThe invention is based on the consideration of using the different meaning of the information units within each information block for a continuously graduated, variable error protection in such a way that certain interference patterns result from transmission disturbances, which can be determined by suitable ones
Techniken gut verschleiern lassen. Durch die Zulassung dieser Fehlermuster kann die Datenrate für die Übertragung reduziert werden, da weniger Daten als beim Stand der Technik für einen ausreichenden Fehlerschutz benötigt werden.Have techniques well veiled. By permitting these error patterns, the data rate for transmission can be reduced since less data than in the prior art are required for adequate error protection.
Die Erfindung wird anhand der Zeichnungen näher erläutert. Es zeigt:The invention is explained in more detail with reference to the drawings. It shows:
Fig. 1 eine schematische Darstellung eines bei dem erfindungsgemäßenFig. 1 is a schematic representation of a in the invention
Verfahren benutzten Informationsblockes, welcher aus einer Folge von neun Informationseinheiten mit unterschiedlichem Fehlerschutz besteht;Method used information block, which consists of a sequence of nine information units with different error protection;
Fig. 2 eine schematische Darstellung ähnlich wie in Fig. 1 für ein alternatives Ausführungsbeispiels, undFig. 2 is a schematic representation similar to that in Fig. 1 for a alternative embodiment, and
Fig. 3 eine schematische Darstellung der beiden Kanäle eines nach dem erfindungsgemäßen Verfahren gemäß Fig. 2 kanalcodierten, stereophonen Tonsignals nach erfolgter Kanaldecodierung.FIG. 3 shows a schematic representation of the two channels of a stereophonic audio signal which is channel-coded according to the inventive method according to FIG. 2 after channel decoding.
Im Folgenden wird angenommen, daß als Quellcodierungsverfahren ein Teilbandverfahren benutzt wird, bei dem das Frequenzband des digitalisierten Tonsignals in eine Vielzahl von Teilbändern aufgespalten wird. Jedes Teilband wird einer von sechs Teilbandgruppen zugeordnet. Die Bitzuweisung und damit Datenreduktion der Abtastwerte jedes Teilbandes erfolgt entsprechend psychoakustischen Gesichtspunkten (Mithörschwellenberechnung). Dabei wird in jedem Teilband für eine bestimmte Anzahl aufeinanderfolgender Abtastwerte der Spitzenwert des Betrages dieser Abtastwerte bestimmt und als sogenannter "Skalenfaktor" quantϊsiert festgehalten sowie zusammen mit den datenreduziertenIn the following it is assumed that a sub-band method is used as the source coding method, in which the frequency band of the digitized audio signal is split into a plurality of sub-bands. Each subband is assigned to one of six subband groups. The bit allocation and thus data reduction of the sample values of each subband is carried out according to psychoacoustic aspects (monitoring threshold calculation). The peak value of the amount of these samples is determined in each sub-band for a certain number of consecutive samples and is quantified as a so-called "scale factor" and recorded together with the data-reduced ones
Abtastwerten sowie der Bitzuweisungsϊnformation einer Kanalcodierung unterzogen. Zusätzlich zu den Skalenfaktoren kann eine Selektierungsinformation für die unbedingt notwendigen Skalenfaktoren übertragen werden, um die Anzahl der zu übertragenden Skalenfaktoren und damit die Datenmenge weiter zu reduzieren. In der Figur ist ein derartiges, datenreduziertes, kanalcodiertes Tonsignal 1 schematisch dargestellt, welches aus einer Vielzahl von aufeinanderfolgenden Informationsblöcken 10 besteht. Die Informationsblöcke 10 sind vorzugsweise gleich lang und umfassen im gezeigten Beispielsfalle jeweils eine Folge von neun Informationseinheiten 11 bis 19. Die neun Informationseinheiten 11 bis 19 enthalten entsprechend dem betrachteten Quellcodierungsschema folgende Information: Einheit 11 BitzuweisungsinformationSamples and the bit allocation information subjected to channel coding. In addition to the scale factors, selection information for the absolutely necessary scale factors can be transmitted in order to further reduce the number of scale factors to be transmitted and thus the amount of data. Such a data-reduced, channel-coded audio signal 1 is shown schematically in the figure and consists of a large number of successive information blocks 10. The information blocks 10 are preferably of the same length and each comprise a sequence of nine information units 11 to 19 in the example shown. The nine information units 11 to 19 contain the following information in accordance with the source coding scheme under consideration: Unit 11 bit allocation information
Einheit 12 Skalenfaktor-SelektierungsinformationUnit 12 scale factor selection information
Einheit 13 SkalenfaktorenUnit 13 scale factors
Einheit 14 Teilbandgruppe Nr. 1Unit 14 sub-band group No. 1
Einheit 15 Teilbandgruppe Nr. 2Unit 15 sub-band group No. 2
Einheit 16 Teilbandgruppe Nr. 3Unit 16 sub-band group No. 3
Einheit 17 Teilbandgruppe Nr. 4Unit 17 sub-band group No. 4
Einheit 18 Teilbandgruppe Nr. 5Unit 18 sub-band group No. 5
Einheit 19 Teilbandgruppe Nr. 6.Unit 19 sub-band group No. 6.
Erfindungsgemäß wird den einzelnen Informationseinheiten 11 bis 19 ein variierender Bitfehlerschutz 21 bis 29 bei der Kanalcodierung zugewiesen. Die Bitzuweisungsinformation 11 und die Skalenfaktor-Selektierungsinformation 12 benötigen einen hohen Fehlerschutz 21 bzw. 22, da Bitfehler innerhalb dieser Informationseinheiten zu einer völligen Zerstörung des Tonsignals am Ausgang des Quellen-Decoders führen können. Da gestörte Skalenfaktoren 13 subjektiv äußerst störend wirken, benötigen sie ebenfalls einen relativ hohen Fehlerschutz 23. Die Teilbandgruppen Nr. 1 bis Nr. 6, die als Informationseinheiten 14 bis 19 dargestellt sind, werden hinsichtlich ihres Fehlerschutzes 24 bis 29 unterschiedlich behandelt. Dabei befinden sich die Teilband-Abtastwerte der Teilbänder des unteren Frequenzbereichs in der Informationseinheit 14, die des höchsten zu übertragenen Frequenzbereichs in der Informationseinheit 19. Den Teilbandgruppen Nr. 1 bis Nr. 6, dargestellt durch die Informationseinheiten 11 bis 19, werden die datenreduzierten Teilbandabtastwerte nach ihrer spektralen Zugehörigkeit zugewiesen. Die Teilbandgruppen erhalten dabei einen von tiefen zu hohen Frequenzen abfallenden, unterschiedlichen Fehlerschutz 24 bis 29. Um Fehler in den Einheiten 14 bis 19 besser erkennen zu können, ist bei dem Ausfuhrungsbeispiel nach Fig. 2 zwischen die Informationseinheiten 13 und 14 eine zusätzliche Informationseinheit 40 eingefügt, welche einen zusätzlichen Fehlerschutz 50 für die Einheiten 14 bis 19 im Hinblick auf bessere Fehlererkennung aufweist. Eine Anwendung dieser besseren Fehlererkennung ist in Fig. 2 anhand eines zweikanaligen, stereophonen Tonsignals gezeigt. In jedem der beiden Kanäle Nr. 1 und Nr. 2 sind drei aufeinanderfolgende Informationsblöcke 110, 120, 130 bzw. 210, 220, 230 veranschaulicht. Jeder dieser Blöcke besteht, wie in Fig. 1 für den Block 10 gezeigt ist, aus neun Informationseinheiten. In den Blöcken 110, 130, 220 und 230 sind, wie durch Querschraffur kenntlich gemacht ist, jeweils eine bzw. zwei Informationseinheiten mit Teilband-Gruppeninformation gestört. Diese Störungen lassen sich mit Hilfe des zusätzlichen Fehlerschutzes 50 gemäß Fig. 2 erkennen. Als Beispiel für eine Fehlerverschleϊerung ist in Fig. 3 vorgesehen, daß die jeweils gestörte(n) Einheiten) durch Informationseinheiten entwederAccording to the invention, the individual information units 11 to 19 are assigned a varying bit error protection 21 to 29 during the channel coding. The bit allocation information 11 and the scale factor selection information 12 require a high level of error protection 21 and 22, respectively, since bit errors within these information units can lead to a complete destruction of the audio signal at the output of the source decoder. Since disrupted scale factors 13 subjectively are extremely disruptive, they also require a relatively high level of error protection 23. Subband groups No. 1 to No. 6, which are shown as information units 14 to 19, are treated differently with regard to their error protection 24 to 29. The subband samples of the subbands of the lower frequency range are in the information unit 14, those of the highest frequency range to be transmitted are in the information unit 19. The subband groups No. 1 to No. 6, represented by the information units 11 to 19, are the data-reduced subband samples assigned according to their spectral affiliation. The subband groups receive different error protection 24 to 29, which drops from low to high frequencies. In order to be able to better recognize errors in the units 14 to 19, in the exemplary embodiment according to FIG. 2 an additional information unit 40 is inserted between the information units 13 and 14, which has an additional error protection 50 for the units 14 to 19 with regard to better error detection . An application of this better error detection is shown in FIG. 2 using a two-channel, stereophonic audio signal. In each of the two channels No. 1 and No. 2, three successive information blocks 110, 120, 130 and 210, 220, 230 are illustrated. Each of these blocks, as shown for block 10 in FIG. 1, consists of nine information units. In blocks 110, 130, 220 and 230, as indicated by cross hatching, one or two information units with subband group information are disturbed. These faults can be identified with the aid of the additional fault protection 50 according to FIG. 2. As an example of an error concealment, it is provided in FIG. 3 that the respectively disrupted unit (s) is replaced by information units either
a) im Nachbarkanal ersetzt werden, welche dort zur gleichen Zeit und in derselben Teilbandgruppe vorliegen, odera) are replaced in the adjacent channel, which are there at the same time and in the same subband group, or
b) in demselben Kanal ersetzt werden, welche dort im vorhergehenden Informationsblock in derselben Teilbandgruppe vorliegen. Diese Ersatz¬ bzw. Verschleierungsmöglichkeiten sind in Fig. 3 durch entsprechende Pfeile angedeutet. b) are replaced in the same channel, which are present there in the previous information block in the same subband group. These replacement or concealment options are indicated in FIG. 3 by corresponding arrows.

Claims

VERFAHREN ZUM ÜBERTRAGEN ODER SPEICHERN EINES AUS EINER FOLGE VON INFORMATIONSBLOCKEN BESTEHENDEN DIGITALISIERTEN, ENCODIERTEN TONSIGNALS ÜBER STÖRBEHAFTETE KANÄLEPATENTANSPRÜCHE METHOD FOR TRANSMITTING OR STORING A DIGITALIZED, ENCODED TONE SIGNALS CONSTRUCTED FROM A BLOCK OF INFORMATION BLOCKS BY INTERFERING CHANNEL PATENT CLAIMS
1. Verfahren zum Übertragen oder Speichern eines aus einer Folge von1. Method of transferring or storing one from a sequence of
Informationsblöcken bestehenden digitalisierten encodierten Tonsignals über störbehaftete Kanäle, wobei die einzelnen Informationsblöcke ausInformation blocks existing digitized encoded audio signal via interference channels, the individual information blocks from
Informationseinheiten unterschiedlichen Informationsinhaltes, wie Steuerungsinformationen, Skalenfaktorinformationen sowie Informationen über die aus einer Teilband- und/oder Transformations-Quellencodierung abgeleiteten, encodierten Abtastwerte bestehen, von denen die Einheiten für die Informationen bezüglich der encodierten Abtastwerte einer bestimmten spektralen Struktur zugeordnet sind, und bei dem das encodierte Tonsignal einer entsprechend dem gewünschten Fehlerschutz bemessenen Kanalcodierung unterzogen wird, wobei im Falle einerInformation units of different information content, such as control information, scale factor information and information about the encoded samples derived from a subband and / or transformation source coding, of which the units for the information relating to the encoded samples are assigned to a specific spectral structure, and in which encoded audio signal is subjected to a channel coding dimensioned according to the desired error protection, in the case of a
Fehlererkennung eine Fehlerkorrektur und bei nicht korrigierbarenError detection is an error correction and in the case of non-correctable ones
Fehlern eine Fehlerverschleierung erfolgt, dadurch gekennzeichnet, daß für die Kanalcodierung der Einheiten der Informationen bezüglich der encodierten Abtastwerte ein variabler Bit-Fehlerschutz in Abhängigkeit von der unterschiedlichen Zuordnung der einzelnen Informationseinheiten zu einer bestimmten spektralen Struktur vorgesehen wird, dahingehend, daß Einheiten für Informationen bezüglich der encodierten Abtastwerte von tieferfrequenten Tonsignalanteilen einen höheren Bit-Fehlerschutz erhalten als Einheiten für Informationen bezüglich der encodierten Abtastwerte von höherfirequenten Tonsignalanteilen, und daß der für die einzelnen Informationseinheiten zu wählende variable Fehlerschutz femer in Abhängigkeit von der nach subjektiven Kriterien zulässigen Dauer und Häufigkeit einer angewendeten Fehlerverschleierung bestimmt wird.Errors are concealed, characterized in that variable bit error protection is dependent on the channel coding of the units of the information with regard to the encoded samples of the different assignment of the individual information units to a specific spectral structure is provided, in that units for information relating to the encoded samples of lower frequency audio signal components receive a higher bit error protection than units for information relating to the encoded samples of higher fire frequency audio signal components, and that for the individual information units to be selected variable error protection is also determined as a function of the duration and frequency of error concealment that is permitted according to subjective criteria.
Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß in den einzelnen Einheiten für die Informationen bezüglich der encodierten Abtastwerte ein kontinuierlich abgestufter Bit-Fehlerschutz für die Kanalcodierung vorgesehen wird.Method according to Claim 1, characterized in that a continuously graded bit error protection for the channel coding is provided in the individual units for the information relating to the encoded samples.
Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß der kontinuierlich abgestufte Bit-Fehlerschutz in den einzelnen -üiformationseinheiten an den Grenzen jeder Einheit dem Bit-Fehlerschutz der jeweils benachbarten Informationseinheit angepaßt wird.Method according to Claim 2, characterized in that the continuously graded bit error protection in the individual information units is adapted to the bit error protection of the respectively adjacent information unit at the boundaries of each unit.
Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß für die Folge der Informationseinheiten bezüglich der encodierten Abtastwerte wenigstens in einer Einheit Informationen bezüglich eines zusätzlichen Fehlerschutzes hinsichtlich erweiterter Fehlererkennung enthalten sind. Method according to one of Claims 1 to 3, characterized in that, for the sequence of the information units with regard to the encoded samples, at least one unit contains information relating to additional error protection with regard to extended error detection.
EP92921545A 1991-10-24 1992-10-20 Process for transmitting or storing over disturbed channels a digitalized, encoded audio signal composed of a series of information blocks Expired - Lifetime EP0609300B1 (en)

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DE4135070 1991-10-24
DE4135070A DE4135070C1 (en) 1991-10-24 1991-10-24
PCT/EP1992/002401 WO1993008656A1 (en) 1991-10-24 1992-10-20 Process for transmitting or storing over disturbed channels a digitalized, encoded audio signal composed of a series of information blocks

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WO1993008656A1 (en) 1993-04-29
DK0609300T3 (en) 1996-11-25
ES2090697T3 (en) 1996-10-16
EP0609300B1 (en) 1996-09-11
CA2122011A1 (en) 1993-04-29
CA2122011C (en) 1999-06-08
ATE142828T1 (en) 1996-09-15
US5440584A (en) 1995-08-08
DE4135070C1 (en) 1993-05-19
AU2769192A (en) 1993-05-21
DE59207139D1 (en) 1996-10-17

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