EP1245024B1 - Verfahren zur fehlerverschleierung von digitalen audiodaten durch spektrale entzerrung - Google Patents

Verfahren zur fehlerverschleierung von digitalen audiodaten durch spektrale entzerrung Download PDF

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Publication number
EP1245024B1
EP1245024B1 EP00981164A EP00981164A EP1245024B1 EP 1245024 B1 EP1245024 B1 EP 1245024B1 EP 00981164 A EP00981164 A EP 00981164A EP 00981164 A EP00981164 A EP 00981164A EP 1245024 B1 EP1245024 B1 EP 1245024B1
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EP
European Patent Office
Prior art keywords
error
audio data
digital audio
values
data
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.)
Expired - Lifetime
Application number
EP00981164A
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German (de)
English (en)
French (fr)
Other versions
EP1245024A1 (de
Inventor
Claus Kupferschmidt
Volker SCHADE-BÜNSOW
Torsten Mlasko
Marc Klein Middelink
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1245024A1 publication Critical patent/EP1245024A1/de
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/20—Aspects of broadcast communication characterised by the type of broadcast system digital audio broadcasting [DAB]

Definitions

  • the invention is based on a method for decoding digital audio data according to the genre of the independent claim.
  • DAB Digital Audio Broadcasting
  • a source decoding an error detection and correction, dequantization and filtering of the data.
  • US-A-5,450,081 describes error concealment in the time domain on the analog and digital audio signal.
  • EP-0 718 982 A generally describes error concealment, in which frame-by-frame equalization of the audio data is carried out.
  • error concealment in the frequency domain is carried out by spectrally shaping the frequency coefficients by multiplying equalizer factors.
  • Patent Abstracts of Japan JP-5328290 describes error concealment by means of interpolation when a counter is reached or exceeded.
  • Wiese D . "Optimization of Error Detection and Concealment for ISO / MPEG / AUDIO CODECs Layer-I and -II" 93 rd AES Convention, No. 3368, 1992, pages 1-18, DAB and various error concealment techniques are described. For example, the replacement of disturbed scale factors by previously correctly received scale factors is mentioned. Another method mentioned describes the filtering of high frequencies, since the interference is particularly localized there.
  • the inventive method for decoding digital audio data with the Features of the independent claim has the advantage that in A spectral dependence of an error number, which is determined by means of the checksum Formation of the audio signals is carried out during dequantization. hereby errors that occur are advantageously compensated for by the number of errors is estimated how that Audio spectrum needs to be changed to reflect the impact minimize this error. So it finds one Error concealment instead.
  • the method according to the invention has a low level Additional effort and can be found in any audio decoder be implemented.
  • that the mistakes being veiled individually leads to a sliding quality loss is achieved, as is otherwise the case with digital data is not possible. That is for a listener pleasant, although he still notice a loss in quality becomes.
  • the values either from a Memory can be loaded and / or by means of a processor be calculated.
  • knowledge is used with which the stored equalizer values originally were determined, and the equalizer values can on the other hand by a calculation on the respective Adapt situation, whereby an adaptive behavior achieves becomes. This optimally adjusts the error correction, so that the user of a radio receiver with the The method according to the invention does not suddenly abort the Quality of audio signals noticed.
  • the measure for the Quality of digital audio data with threshold values is compared. This can depend on whether the measure is above predetermined threshold values or not corresponding equalizer values can be set. This enables easy adaptation to a particular Error situation. Especially if the measure is a very indicates a low number of errors or that there are no errors The method according to the invention is not used since none Error correction is necessary. If the measure shows such Number of errors that is above the largest threshold, i.e. that the error correction no longer offers a remedy, then a muting is activated. This will give the user an optimized depending on the number of errors Error correction offered.
  • FIG. 1 shows a block diagram of the inventive method and Figure 2 an MPEG-1 Layer II frame.
  • DAB Digital Broadcasting
  • DRM Digital Radio Mondial
  • Another error detection that is in the source decoding is implemented and works by means of a checksum, forms a second stage to identify and correct errors correct.
  • a checksum forms a second stage to identify and correct errors correct.
  • if an error is detected previously saved data current faulty data replace. So there is an error concealment, however, since temporally successive audio data is a close one Have correlation with each other, it's a good one Estimate to replace data that is currently in error.
  • the Audio signals divided into frequency ranges. For each Frequency range becomes the frequency value with the largest Signal power used as reference value, with DAB as Called scale factor. The remaining signal values in this Frequency range are standardized to this reference value. The distance from the smallest signal power to greatest signal power significantly reduced. The Reference values are then used with the standardized audio data Transfer recipient.
  • DAB Digital Audio Broadcasting
  • CRC Cyclic Redundancy Check
  • the determined number of errors in the Reference values compared with threshold values. Over or under the threshold value for the current number of errors is determined what action is being taken.
  • Figure 1 is a block diagram of the invention Decoding shown. The procedure shown is running on a processor that is the audio decoder.
  • the encoded audio data 1 are in a block 2, a Demultiplexing and error detection for Subjected to reference values.
  • DAB are data from different radio programs in a data stream summarized in a multiplex. Then in the receiver Data belonging to the set radio program using a demultiplexing method from the data stream filtered out to decode this data so that it can be displayed.
  • Block 2 transfers a block via a first output 13 Data about the detected errors, namely the number of detected errors. Based on this, a block is made in block 13 equalizer values from a memory that is sent to the Audio decoder is connected. For that are in the Store different sets of equalizer values, that are linked to a respective number of errors. Based the number of errors then becomes the corresponding set of Equalizer values selected and loaded.
  • the equalizer values can also be set using a given equation can be calculated. Furthermore, a Set of equalizer values loaded from memory to then, based on these equalizer values, new sets of Calculate equalizer values.
  • Block 2 transfers a block via a second output 3 the digital audio data, in block 3 a Dequantization of this digital audio data using of the selected equalizer coefficients is carried out.
  • the block 13 is therefore via an output with a second Input of block 3 connected to the equalizer values to the Hand over block 3.
  • the dequantized data are then sent from block 3 to the Pass block 4, which filters the dequantized data. At the The output of block 4 is then the decoded audio data ready for further processing.
  • the whole process is carried out on a processor that runs the Performs audio decoding in a radio receiver, implemented.
  • FIG. 2 an MPEG1 Layer II frame is shown. This Frame structure is used in the transmission of DAB.
  • the MPEG-1 Layer II frame begins with a frame header 6, followed by a field 7 for frame error detection.
  • a checksum in English as Cyclic Redundancy Check designated, used. Is a defective frames have been identified using the checksum, then the last correctly received frame will be the as replace the defective frame, or there will be a Mute for this frame.
  • the checksum is like this here designed so that not all possible errors are recognized. This saves considerable transmission bandwidth, albeit with it not all errors are recognized. Characteristic of the Checksum is the test of a bit sum, where a Consideration of the content of the audio data, as with the the method according to the invention is not the case.
  • a reference value selection is made in the next field 9 met. It is quite possible that reference values for multiple groups of consecutive Sampling values apply, the reference values being the same or have at least very similar signal power values. This has already been set out above. Therefore, it is not necessary several reference values for each frequency range transferred when a reference value multiple groups represents. This field 9 now describes which Reference values for which groups of samples for Denormalization are to be used.
  • the reference values themselves are then stored in field 10.
  • field 11 are the actual audio data with the Reference values are denormalized.
  • field 12 there is additional data that accompanies the program Include information and especially the checksum for the Reference values of the following framework.
  • a counter as a measure of Transmission quality incremented per error of a frame and is decremented per error-free frame. Will this Counters compared with threshold values can thus be estimated whether there are only short-term disturbances or these occur more often. So it becomes a memory function implemented that the history of temporal Error frequency taken into account. Occurs at short notice Fault, the counter becomes only a small one Defect status determined and on error concealment measures can be dispensed with. The process shows advantageously an inertia due to isolated Error does not take action to conceal errors.
  • two counters can also be used reset after an optimal reception.
  • Reference values can also be grouped together being when an error is detected in a reference value the whole group with stored reference values is replaced. This leads to a saving of effort.

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)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Circuits Of Receivers In General (AREA)
EP00981164A 1999-12-08 2000-11-07 Verfahren zur fehlerverschleierung von digitalen audiodaten durch spektrale entzerrung Expired - Lifetime EP1245024B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19959037A DE19959037B4 (de) 1999-12-08 1999-12-08 Verfahren zur Dekodierung von digitalen Audiodaten
DE19959037 1999-12-08
PCT/DE2000/003895 WO2001043120A1 (de) 1999-12-08 2000-11-07 Verfahren zur fehlerverschleierung von digitalen audiodaten durch spektrale entzerrung

Publications (2)

Publication Number Publication Date
EP1245024A1 EP1245024A1 (de) 2002-10-02
EP1245024B1 true EP1245024B1 (de) 2004-06-30

Family

ID=7931773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00981164A Expired - Lifetime EP1245024B1 (de) 1999-12-08 2000-11-07 Verfahren zur fehlerverschleierung von digitalen audiodaten durch spektrale entzerrung

Country Status (6)

Country Link
US (1) US6703948B1 (enExample)
EP (1) EP1245024B1 (enExample)
JP (2) JP5031963B2 (enExample)
DE (2) DE19959037B4 (enExample)
TW (1) TW516274B (enExample)
WO (1) WO2001043120A1 (enExample)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3306053B2 (ja) 1999-05-24 2002-07-24 雅春 市川 発動機の弁装置
DE19959037B4 (de) * 1999-12-08 2004-04-29 Robert Bosch Gmbh Verfahren zur Dekodierung von digitalen Audiodaten
DE10034783A1 (de) * 2000-07-18 2002-02-07 Bosch Gmbh Robert Verfahren zur Fehlerverschleierung von Übertragungsfehlern in digitalen Audiodaten
US20060235883A1 (en) * 2005-04-18 2006-10-19 Krebs Mark S Multimedia system for mobile client platforms
JP2008141373A (ja) * 2006-11-30 2008-06-19 Matsushita Electric Ind Co Ltd 復号化装置、移動体受信装置、メディア再生装置
DE102007006995A1 (de) * 2007-02-14 2008-08-21 Robert Bosch Gmbh Korrektureinrichtung für audiovisuelle Daten
US20100195490A1 (en) * 2007-07-09 2010-08-05 Tatsuya Nakazawa Audio packet receiver, audio packet receiving method and program
CA2945791A1 (en) * 2014-04-17 2015-10-22 Audimax, Llc Systems, methods and devices for electronic communications having decreased information loss
US11215646B2 (en) 2019-04-22 2022-01-04 Panduit Corp. Absence of voltage detection device

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US4943964A (en) * 1987-08-12 1990-07-24 Hitachi, Ltd. PCM signal reproducing device
JPH0828758B2 (ja) * 1989-06-20 1996-03-21 富士通株式会社 回線監視方式
US5148487A (en) * 1990-02-26 1992-09-15 Matsushita Electric Industrial Co., Ltd. Audio subband encoded signal decoder
JP2906646B2 (ja) * 1990-11-09 1999-06-21 松下電器産業株式会社 音声帯域分割符号化装置
JP2623375B2 (ja) * 1991-03-07 1997-06-25 松下電器産業株式会社 データ受信装置
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DE4202140A1 (de) * 1992-01-27 1993-07-29 Thomson Brandt Gmbh Verfahren zur uebertragung digitaler audio-signale
JPH05328290A (ja) * 1992-05-18 1993-12-10 Canon Inc データ再生処理回路
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JPH06224880A (ja) * 1993-01-25 1994-08-12 Canon Inc 無線データ通信装置
JPH0744197A (ja) * 1993-08-02 1995-02-14 Matsushita Electric Ind Co Ltd 音声復号装置
DE4409960A1 (de) * 1994-03-23 1995-09-28 Inst Rundfunktechnik Gmbh Verfahren zur Verminderung der subjektiven Störempfindung bei störungsbehaftetem Empfang bei Verwendung von digital übertragenen Tonsignalen
KR970011728B1 (ko) * 1994-12-21 1997-07-14 김광호 음향신호의 에러은닉방법 및 그 장치
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DE19959037B4 (de) * 1999-12-08 2004-04-29 Robert Bosch Gmbh Verfahren zur Dekodierung von digitalen Audiodaten

Also Published As

Publication number Publication date
EP1245024A1 (de) 2002-10-02
DE19959037A1 (de) 2001-06-28
JP2012113318A (ja) 2012-06-14
WO2001043120A1 (de) 2001-06-14
TW516274B (en) 2003-01-01
DE19959037B4 (de) 2004-04-29
WO2001043120A8 (de) 2001-09-13
JP5031963B2 (ja) 2012-09-26
JP2003516559A (ja) 2003-05-13
US6703948B1 (en) 2004-03-09
DE50006984D1 (de) 2004-08-05

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