EP1303856B1 - Verfahren zur fehlerverschleierung von übertragungsfehlern in digitalen audiodaten - Google Patents
Verfahren zur fehlerverschleierung von übertragungsfehlern in digitalen audiodaten Download PDFInfo
- Publication number
- EP1303856B1 EP1303856B1 EP01953895A EP01953895A EP1303856B1 EP 1303856 B1 EP1303856 B1 EP 1303856B1 EP 01953895 A EP01953895 A EP 01953895A EP 01953895 A EP01953895 A EP 01953895A EP 1303856 B1 EP1303856 B1 EP 1303856B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- channel
- error
- digital audio
- audio data
- errors
- 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
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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 Reception quality from the previously set audio channel for the initialization of the Error concealment is used with the currently set audio channel.
- the previously set audio channel provides data on the transmission conditions required for Time is available and thus an estimate of which reception quality at the current audio channel set is expected to be expected.
- the channel error protection level of the currently and previously set audio channel the starting values can be adjusted. Has the currently set audio channel higher channel error protection than the previously set, then there is less Error concealment necessary than was previously required.
- the start values are either from the current Number of transmission errors of the set digital Audio channel or from a transmission error number of one previously set digital audio channel. In the The number of transmission errors, the bit error rate and / or flow the number of scale factor errors and / or the number of Checksum error on. By comparing the Channel error protection levels of the first and second audio channels the start values are adjusted accordingly.
- the Channel error protection level indicates how much data the User data can be added to the receiving end Recognize transmission errors or to correct.
- the radio receiver is a digital receiver in which Is able to receive both DAB and FM. Then the Error concealment if initially an FM audio channel was selected and then a DAB channel, through a Sniffer function prepared. That in short The radio receiver checks the time periods Number of transmission errors with equivalent digital Audio channels to in case of deterioration Switch the reception quality of the FM channel automatically. This also applies in the opposite case, if at a poor reception situation with DAB to an equivalent FM audio channel is switched. Here then during of a frame the reception quality of equivalent FM channels determined. Such equivalent channels are called Accompanying information with or are in the Broadcast receiver already saved.
- the reception quality can vary from the reception field strength (Signal field strength), the synchronization attempts, the Baseband energy and other parameters can be determined.
- This reception quality is specified with a Quality measure compared, which is determined empirically. is the reception quality better than the quality measure, then lies the reception quality is acceptable below the quality measure, then at an existing one digital audio channel switched to this, provided the digital audio channel has a number of transmission errors, which enables good reception (no muting).
- the FM channel can be a digital carrier (RDS), which is used to determine the number of transmission errors can be used.
- Method step 18 If it was found in method step 16 that no digital audio channel had been set and therefore none Number of transmission errors for the initialization of the Error concealment, then in Method step 18 the currently calculated Number of transmission errors resulting from the bit error rate, which results from the channel decoding, the Number of checksum errors caused by a CRC (Cyclic Redundancy Check) is calculated and the Number of scale factors errors calculated. With that the Initialization with start values in method step 20 started, then in process step 21 again Error concealment with currently calculated Continuing transmission error numbers.
- CRC Cyclic Redundancy Check
Description
Es zeigt
Claims (6)
- Verfahren zur Fehlerverschleierung von Übertragungsfehlern in digitalen Audiodaten, wobei ein erster Audiokanal gewählt wird (12), wobei die in diesem ersten Audiokanal übertragenen digitalen Audiodaten empfangen werden (13), wobei an den empfangenen digitalen Audiodaten eine Kanaldecodierung (14) durchgeführt wird, wobei dann die digitalen Audiodaten einer Quellendecodierung unterzogen werden, wobei eine Fehlerverschleierung mit Startwerten initialisiert wird (15), wobei die Fehlerverschleierung durch eine erste Empfangsqualität des ersters Audiokanals an die digitalen Audiodaten angepasst wird und wobei nach der Kanaldecodierung (14) die Fehlerverschleierung (21) von den Übertragungsfehlern in den digitalen Audiodaten durchgeführt wird, dadurch gekennzeichnet, dass die Startwerte aus einer zweiten Empfangsqualität von den digitalen Audiodaten berechnet werden, die in einem zweiten Audiokanal übertragen werden, der vor dem ersten Audiokanal ausgewählt worden war.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass zusätzlich die Kanalfehlerschutzniveaus des ersten und des zweiten Audiokanals verglichen werden und dass in Abhängigkeit von dem Vergleich die Startwerte angepasst werden.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die erste und die zweite Empfangsqualität der digitalen Audiodaten aus der Bitfehlerrate und/oder der Awzahl der Skalenfaktorfehler und/oder der Anzahl der Prüfsummenfehler bestimmt werden.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Fehlerverschleierung durch eine Entzerrung realisiert wird.
- Verfahren nach einem der Ansprüche 1, 2, 3 oder 4, dadurch gekennzeichnet, dass die Zeitdauer der Abspeicherung der zweiten Empfangsqualität der digitalen Audiodaten mit einem Schwellwert verglichen wird und dass, wenn die Zeitdauer den Schwellwert übertrifft, die zweite Empfangsqualität gelöscht wird und nur die erste Empfangsqualität für die Initialisierung der Fehlerverschleierung verwendet wird.
- Verwendung eines Rundfunkempfängers zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Rundfunkempfänger Mittel zur Durchführung des Verfahrens, einen Hochfrequenzempfänger (2) und Mittel zur akustischen Wiedergabe (9, 10) aufweist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10034783 | 2000-07-18 | ||
DE10034783A DE10034783A1 (de) | 2000-07-18 | 2000-07-18 | Verfahren zur Fehlerverschleierung von Übertragungsfehlern in digitalen Audiodaten |
PCT/DE2001/002557 WO2002007149A1 (de) | 2000-07-18 | 2001-07-13 | Verfahren zur fehlerverschleierung von übertragungsfehlern in digitalen audiodaten |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1303856A1 EP1303856A1 (de) | 2003-04-23 |
EP1303856B1 true EP1303856B1 (de) | 2004-10-06 |
Family
ID=7649242
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01953895A Expired - Lifetime EP1303856B1 (de) | 2000-07-18 | 2001-07-13 | Verfahren zur fehlerverschleierung von übertragungsfehlern in digitalen audiodaten |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1303856B1 (de) |
JP (1) | JP4813747B2 (de) |
CA (1) | CA2415424C (de) |
DE (2) | DE10034783A1 (de) |
ES (1) | ES2228914T3 (de) |
WO (1) | WO2002007149A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE527866C2 (sv) * | 2003-12-19 | 2006-06-27 | Ericsson Telefon Ab L M | Kanalsignalmaskering i multikanalsaudiosystem |
US7835916B2 (en) | 2003-12-19 | 2010-11-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Channel signal concealment in multi-channel audio systems |
EP3340498B1 (de) | 2016-12-22 | 2022-07-13 | Nxp B.V. | Empfangspfadqualitätsinformationen |
EP3340497A1 (de) * | 2016-12-22 | 2018-06-27 | Nxp B.V. | Fehlerverdeckung mit redundanten datenströme |
WO2021200151A1 (ja) * | 2020-03-30 | 2021-10-07 | ソニーグループ株式会社 | 送信装置、送信方法、受信装置、及び受信方法 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2507972B2 (ja) * | 1993-08-20 | 1996-06-19 | 日本電気株式会社 | 回線品質監視装置 |
JPH08242215A (ja) * | 1995-03-06 | 1996-09-17 | Mitsubishi Electric Corp | ディジタル音声放送受信機 |
JP3345557B2 (ja) * | 1996-10-14 | 2002-11-18 | アルパイン株式会社 | デジタルオーディオ放送受信装置及び受信方法 |
DE19959037B4 (de) * | 1999-12-08 | 2004-04-29 | Robert Bosch Gmbh | Verfahren zur Dekodierung von digitalen Audiodaten |
-
2000
- 2000-07-18 DE DE10034783A patent/DE10034783A1/de not_active Ceased
-
2001
- 2001-07-13 WO PCT/DE2001/002557 patent/WO2002007149A1/de active IP Right Grant
- 2001-07-13 ES ES01953895T patent/ES2228914T3/es not_active Expired - Lifetime
- 2001-07-13 JP JP2002512969A patent/JP4813747B2/ja not_active Expired - Fee Related
- 2001-07-13 CA CA002415424A patent/CA2415424C/en not_active Expired - Fee Related
- 2001-07-13 DE DE50104018T patent/DE50104018D1/de not_active Expired - Lifetime
- 2001-07-13 EP EP01953895A patent/EP1303856B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE50104018D1 (de) | 2004-11-11 |
ES2228914T3 (es) | 2005-04-16 |
EP1303856A1 (de) | 2003-04-23 |
JP4813747B2 (ja) | 2011-11-09 |
CA2415424C (en) | 2007-10-02 |
JP2004504744A (ja) | 2004-02-12 |
WO2002007149A1 (de) | 2002-01-24 |
DE10034783A1 (de) | 2002-02-07 |
CA2415424A1 (en) | 2003-01-08 |
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