EP1405302B1 - Verfahren zur störverdeckung bei digitaler audiosignalübertragung - Google Patents
Verfahren zur störverdeckung bei digitaler audiosignalübertragung Download PDFInfo
- Publication number
- EP1405302B1 EP1405302B1 EP02740252A EP02740252A EP1405302B1 EP 1405302 B1 EP1405302 B1 EP 1405302B1 EP 02740252 A EP02740252 A EP 02740252A EP 02740252 A EP02740252 A EP 02740252A EP 1405302 B1 EP1405302 B1 EP 1405302B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- audio signal
- audio
- digital
- data error
- 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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Images
Classifications
-
- 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
Definitions
- the invention is based on a method for concealing Disturbances in a signal derived from a digital signal, reproduced audio signal according to the genus of independent patent claim.
- analog FM radio receiver In case of analog. Systems are decreasing Reception quality to a gradual deterioration of Quality of the audio signal contained in the broadcast signal, the For example, analog FM radio receiver with a Stereo / mono switching or muting of the encounter the audio signal to be reproduced.
- Patent Abstracts of Japan to JP-A-10-308708 discloses an arrangement for receiving and for reproducing digitally transmitted audio information transmitted via a Error detection and correction has, whereby in the case of an undisturbed or disturbed, however correctable received signal reproduces the audio signals contained therein while in the case of a significantly disturbed receive signal section means a noise signal generator using the received signal, a noise signal is generated and added to the audio information to be reproduced is added.
- the inventive method with the features of the independent claim has the advantage that the listener a reliable Assessment basis for the currently selected playback volume for a is transmitted by means of a digital Ruadfunksignals transmitted Andiosignal.
- the listener a reliable Assessment basis for the currently selected playback volume for a is transmitted by means of a digital Ruadfunksignals transmitted Andiosignal.
- the user disadvantageously increases the volume. additionally is the perceived as unpleasant effect of bit errors within the received digital broadcasting signal in the form of Gurgelns within the reproduced Audio signal reduced.
- the invention proposes that in a method of occlusion of noise in a reproduced audio signal resulting from a digital signal is derived, wherein the reproduced audio signal in dependence of a Data error statistics of the digital signal is attenuated, the attenuated Audio signal depending on the data error statistics of the digital signal Replacement signal is superimposed.
- the reproduced Audio signal depending on the data error statistics of the digital signal is frequency selectively attenuated, and that the replacement signal is frequency-selectively superimposed.
- the reproduction quality of a received analogue Broadcast signal usually a so-called high-cut, d. H. a reduction of high frequency fractions of the to be reproduced audio signal.
- a particularly good basis for estimating the actually set volume of the digital Radio receiver is given by the fact that the Superimposition of the substitute signal the attenuation of the Audio signal due to a high data error rate completely compensated, so that the volume of the overlay the attenuated audio signal and the substitute signal formed Retroaudiosignals the one undisturbed received or reproduced audio signal corresponds.
- the substitute signal can advantageously be in the form of a Noise signal, a sine or a note or a stored or synthesized speech signal formed be. Especially in the case of a noise signal as Replacement signal can continue this advantageously in terms of its frequency response to the psychoacoustic Be adapted to the characteristics of the human ear.
- the replacement signal can be attenuated Audio signal either in the time domain or in the frequency domain be superimposed additively.
- the inventive method is characterized in Advantageously characterized by the fact that it basically all audio formats or all digitally transmitted Audio signals, in particular digital broadcast signals various standards, such as DAB, DSR or similar, equally applicable.
- the process is particularly simple feasible, since the control of both the degree of Attenuation of the reproduced audio signal, as well as the Measurement of the superposition of the substitute signal in direct Dependence of one by means of a data error statistics detectable data error rate of the received digital Broadcast signal is controllable.
- the inventive method in no way on the Source decoding of the audio data from the received digital broadcasting signals, so that the process without affecting the decoded audio signal as well can be switched off.
- an audio decoder MPEG 1, 2 Layer 2 with integrated bit or data error concealment shown in Figure 1, an audio decoder MPEG 1, 2 Layer 2 with integrated bit or data error concealment shown.
- MPEG designates one from the Fraunhofer-Gesellschaft developed method for coding or Compression of digital audio data.
- the named Audio decoder thus serves the decoding of the MPEG format present digital audio data.
- the MPEG encoded digital audio signal 101 which is at a Data input 10 of the arrangement pending is a decoder 11th fed.
- the decoder 11 the decoding of the coded digital audio signal and an error detection and optionally correcting the received data signal.
- the pending at a first output of the decoder 11 Audio signal 111 is a filter circuit 12, the for example in the form of an equalizer, but optionally also in the form of a bandpass filter with adjustable Cutoff frequencies, edge steepness and Total amplification factor can be formed, fed.
- the audio signal 121 evaluated by the filter 12 is an overlay circuit 13 in the present case in the form an adder 13 is supplied.
- the one Circuit arrangement 16 for generating an error statistic is supplied.
- a data error rate of at the input 10 of the circuit 1 pending digital error signal indicating error signal 161 removable is supplied.
- This is an assignment circuit 17 fed in the function of the error statistics signal 161 Parameters for controlling the equalizer 12 or the Filters 12 are selected. For example, in case an approximately undisturbed signal at the data input 10 the equalizer 12 and the filter 12 via a Filter control signal 171 controlled such that this supplied decoded audio signal 111 substantially unchanged at the output of the equalizer or filter 12 is removable.
- the assignment circuit 17 is also a from the Error Statistics Generation 16 Generated Bit Error Signal 162 fed, which is the bit error of the digital input signal represents.
- the bit error signal 162 is from the internal Checks for frame header or the data error itself is derived and is a direct measure of the current Error rate.
- the error statistics signal 161 due to a low-pass characteristic on error in digital signal comparatively slow-reacting Signal.
- selected data set 171 for Control of the equalizer 12 and the filter 12 is this supplied from the assignment circuit 17. Furthermore, it is a record 172 inverse to the selected record 171 Filter parameters supplied to a replacement signal generator 18, furthermore, according to the mentioned preferred embodiment of the invention, the bit error signal 162 from the Error statistics generation 16 is supplied.
- the spare signal generator 18 generates depending on him supplied second equalizer or filter parameters 172, according to the preferred embodiment of the invention above in addition to the bit error signal 162, a shaped according to these parameters Spare signal, which is a second input of the Overlay circuit 13 is supplied.
- the the replacement signal generation 18 supplied Filter parameter set 172 is according to a preferred Embodiment of the invention designed such that the filter curves of the filter 12 and the evaluation of the Replacement signal provided in the spare signal generation 18 second filter compensate each other, so that in the sum gives a linear frequency response.
- the filter curves for example, Figure 2 too see where the amplitude frequency response 125 of the filter 12th and the further amplitude frequency response 185 of the evaluation the replacement signal in the spare signal generation 18 provided second filter over the frequency 200th are applied.
- the one certain degree of error or a certain Data error rate of the input signal is assigned by a maximum value with a 3dB cutoff frequency 210 closes down to the value 0.
- a maximum frequency 220 a Audio signal playback anyway for the human ear is not noticeable, the further falls Amplitude frequency response 185 to this maximum frequency 220 out to the value 0.
- the replacement signal generator 18 is according to a preferred Embodiment of the invention designed such that in this generates a neutral noise signal as a substitute signal becomes.
- a total audio signal 141 which consists of a Superimposition of one according to the measured data error rate attenuated audio signal and also according to the Data error rate generated noise signal consists.
- the proportion of the Audio signal 121 increases at the expense of the noise signal 181
- the Audio signal 121 increasingly through the noise signal 181st replaced.
- the substitute signal in the form of a or a superposition of several sine or Knowledge is formed.
- the replacement signal is a stored or is synthesized speech signal. It can continue Replacement signal 181 also in the form of a to the physiology of adapted to human hearing and filtered accordingly Be carried out noise.
- the present method is basically any kind of digitally coded audio signals applicable. So it is within the scope of the present invention, that the data input 10 any digitally coded Audio signal 101 can be fed.
- the decoder is then on the particular type of digitally encoded audio signal 101 adapted or adapted so that at the output of a correctly decoded audio signal 111 is removable.
- the invention is also in the time domain present audio signals applicable, in this case then the back transformation 14 accounts, further then Filter 12, decoding 16, assignment circuit 17 and Replacement signal generation 18 adapted accordingly.
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)
- Noise Elimination (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Circuit For Audible Band Transducer (AREA)
Description
Claims (3)
- Verfahren zur Verdeckung von Störungen in einem wiedergegebenen Audiosignal, das aus einem digitalen Signal abgeleitet wird,
wobei das wiedergegebene Audiosignal in Abhängigkeit einer Datenfehlerstatisk des digitalen Signals abgeschwächt wird,
wobei dem Audiosignal in Abhängigkeit der Datenfehlerstatistik des digitalen Signals ein Ersatzsignal überlagert wird
dadurch gekennzeichnet, dass das wiedergegebene Audiosignal in Abhängigkeit der Datenfehlerstatistik des digitalen Signals frequenzselektiv abgeschwächt wird, und
dass das Ersatzsignal frequenzselektiv überlagert wird. - Verfahren nach Ansprach 1, dadurch gekennzeichnet, dass die Überlagerung des Ersatzsignals die Abschwächung des Audiosignals kompensiert.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Ersalzsignal durch ein Rauschsignal, einen Sinus- oder Kennton oder durch ein Sprachsignal gebildet wird.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10130233 | 2001-06-22 | ||
DE10130233A DE10130233A1 (de) | 2001-06-22 | 2001-06-22 | Verfahren zur Störverdeckung bei digitaler Audiosignalübertragung |
PCT/DE2002/001368 WO2003001509A1 (de) | 2001-06-22 | 2002-04-12 | Verfahren zur störverdeckung bei digitaler audiosignalübertragung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1405302A1 EP1405302A1 (de) | 2004-04-07 |
EP1405302B1 true EP1405302B1 (de) | 2004-12-15 |
Family
ID=7689138
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02740252A Expired - Lifetime EP1405302B1 (de) | 2001-06-22 | 2002-04-12 | Verfahren zur störverdeckung bei digitaler audiosignalübertragung |
Country Status (6)
Country | Link |
---|---|
US (1) | US20040221209A1 (de) |
EP (1) | EP1405302B1 (de) |
JP (1) | JP4221288B2 (de) |
DE (2) | DE10130233A1 (de) |
ES (1) | ES2233828T3 (de) |
WO (1) | WO2003001509A1 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100708123B1 (ko) * | 2005-02-04 | 2007-04-16 | 삼성전자주식회사 | 자동으로 오디오 볼륨을 조절하는 방법 및 장치 |
ATE451685T1 (de) * | 2005-09-01 | 2009-12-15 | Ericsson Telefon Ab L M | Verarbeitung von codierten echtzeitdaten |
US8620644B2 (en) * | 2005-10-26 | 2013-12-31 | Qualcomm Incorporated | Encoder-assisted frame loss concealment techniques for audio coding |
DE102006034625A1 (de) * | 2006-07-27 | 2008-01-31 | Bayerische Motoren Werke Ag | Verfahren zur Klangausgabe für ein mobiles Radiogerät |
JP2013031151A (ja) | 2011-06-20 | 2013-02-07 | Renesas Electronics Corp | 暗号通信システムおよび暗号通信方法 |
WO2015190985A1 (en) * | 2014-06-13 | 2015-12-17 | Telefonaktiebolaget L M Ericsson (Publ) | Burst frame error handling |
JP2016046719A (ja) * | 2014-08-25 | 2016-04-04 | 株式会社東芝 | データ生成装置、通信装置、移動体、データ生成方法およびプログラム |
FR3056043B1 (fr) * | 2016-09-15 | 2019-02-01 | Continental Automotive France | Dispositif de traitement d'un signal audio issu d'un signal radiofrequence |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5938912A (ja) * | 1982-08-27 | 1984-03-03 | Nec Corp | Pcmオ−デイオエラ−補正回路 |
WO1994026036A1 (en) * | 1993-05-04 | 1994-11-10 | Motorola Inc. | Apparatus and method for substantially eliminating noise in an audible output signal |
FI98164C (fi) * | 1994-01-24 | 1997-04-25 | Nokia Mobile Phones Ltd | Puhekooderin parametrien käsittely tietoliikennejärjestelmän vastaanottimessa |
DE4427351C1 (de) * | 1994-08-02 | 1996-03-28 | Siemens Ag | Signalverarbeitungsverfahren und -anordnung für blockweise codierte Sprachsignale eines Nachrichtensystems |
JP3264822B2 (ja) * | 1995-04-05 | 2002-03-11 | 三菱電機株式会社 | 移動体通信機器 |
FI963870A (fi) * | 1996-09-27 | 1998-03-28 | Nokia Oy Ab | Virheiden piilottaminen digitaalisessa audiovastaanottimessa |
US6032048A (en) * | 1997-03-17 | 2000-02-29 | Ericsson Inc. | Method and apparatus for compensating for click noise in an FM receiver |
JP3649854B2 (ja) * | 1997-05-09 | 2005-05-18 | 松下電器産業株式会社 | 音声符号化装置 |
US6915263B1 (en) * | 1999-10-20 | 2005-07-05 | Sony Corporation | Digital audio decoder having error concealment using a dynamic recovery delay and frame repeating and also having fast audio muting capabilities |
-
2001
- 2001-06-22 DE DE10130233A patent/DE10130233A1/de not_active Withdrawn
-
2002
- 2002-04-12 JP JP2003507810A patent/JP4221288B2/ja not_active Expired - Fee Related
- 2002-04-12 US US10/481,776 patent/US20040221209A1/en not_active Abandoned
- 2002-04-12 EP EP02740252A patent/EP1405302B1/de not_active Expired - Lifetime
- 2002-04-12 ES ES02740252T patent/ES2233828T3/es not_active Expired - Lifetime
- 2002-04-12 DE DE50201804T patent/DE50201804D1/de not_active Expired - Lifetime
- 2002-04-12 WO PCT/DE2002/001368 patent/WO2003001509A1/de active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
JP4221288B2 (ja) | 2009-02-12 |
ES2233828T3 (es) | 2005-06-16 |
EP1405302A1 (de) | 2004-04-07 |
JP2004533021A (ja) | 2004-10-28 |
WO2003001509A1 (de) | 2003-01-03 |
DE50201804D1 (de) | 2005-01-20 |
US20040221209A1 (en) | 2004-11-04 |
DE10130233A1 (de) | 2003-01-02 |
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