CA2664312A1 - Generation of decorrelated signals - Google Patents
Generation of decorrelated signals Download PDFInfo
- Publication number
- CA2664312A1 CA2664312A1 CA002664312A CA2664312A CA2664312A1 CA 2664312 A1 CA2664312 A1 CA 2664312A1 CA 002664312 A CA002664312 A CA 002664312A CA 2664312 A CA2664312 A CA 2664312A CA 2664312 A1 CA2664312 A1 CA 2664312A1
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- audio input
- input signal
- output signal
- interval
- signal
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- 230000003111 delayed effect Effects 0.000 claims abstract 33
- 230000001052 transient effect Effects 0.000 claims abstract 3
- 238000000034 method Methods 0.000 claims 7
- 238000004590 computer program Methods 0.000 claims 1
- 230000005236 sound signal Effects 0.000 claims 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S1/00—Two-channel systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S1/00—Two-channel systems
- H04S1/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S2420/03—Application of parametric coding in stereophonic audio systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S2420/05—Application of the precedence or Haas effect, i.e. the effect of first wavefront, in order to improve sound-source localisation
Abstract
In a case of transient audio input signals, in a multi-channel audio reconstruction, uncorrelated output signals are generated from an audio input signal in that the audio input signal is mixed with a representation of the audio input signal delayed by a delay time such that, in a first time interval, a first output signal corresponds to the audio input signal, and a second output signal corresponds to the delayed representation of the audio input signal, wherein, in a second time interval, the first output signal corresponds to the delayed representation of the audio input signal, and the second output signal corresponds to the audio input signal.
Claims (26)
1. Decorrelator for generating output signals (50, 52) based on an audio input signal (54), comprising:
a mixer (60) for combining a representation of the audio input signal delayed by a delay time (58) with the audio input signal (54) so as to obtain a first (50) and a second (52) output signal having time-varying portions of the audio input signal (54) and the delayed representation of the audio input signal (58), wherein in a first time interval (70), the first output signal (50) contains a proportion of more than 50 percent of the audio input signal (54) and the second output signal (52) contains a proportion of more than 50 percent of the delayed representation of the audio input signal (58), and wherein in a second time interval (72), the first output signal (50) contains a proportion of more than 50 percent of the delayed representation of the audio input signal (58), and the second output signal (52) contains a proportion of more than 50 percent of the audio input signal (54).
a mixer (60) for combining a representation of the audio input signal delayed by a delay time (58) with the audio input signal (54) so as to obtain a first (50) and a second (52) output signal having time-varying portions of the audio input signal (54) and the delayed representation of the audio input signal (58), wherein in a first time interval (70), the first output signal (50) contains a proportion of more than 50 percent of the audio input signal (54) and the second output signal (52) contains a proportion of more than 50 percent of the delayed representation of the audio input signal (58), and wherein in a second time interval (72), the first output signal (50) contains a proportion of more than 50 percent of the delayed representation of the audio input signal (58), and the second output signal (52) contains a proportion of more than 50 percent of the audio input signal (54).
2. Decorrelator of claim 1, wherein, in the first time interval (70) the first output signal corresponds to the audio input signal (54), and the second output signal (52) corresponds to the delayed representation of the audio input signal (58), wherein in the second time interval (72), the first output signal (50) corresponds to the delayed representation of the audio input signal (58) and the second output signal (52) corresponds to the audio input signal (54).
3. Decorrelator of claim 1, wherein, in a begin interval and an end interval at the beginning and at the end of the first time interval (70), the first output signal and the second output signal (52) contain portions of the audio input signal (54) and the delayed representation of the audio input signal (58), wherein in an intermediate interval between the begin interval and the end interval of the first time interval, the first output signal corresponds to the audio input signal (54), and the second output signal (52) corresponds to the delayed representation of the audio input signal (58); and wherein in a begin interval and in an end interval at the beginning and at the end of the second time interval (70), the first output signal and the second output signal (52) contain portions of the audio input signal (54) and the delayed representation of the audio input signal (58), wherein in an intermediate interval between the begin interval and the end interval of the second time interval, the first output signal corresponds to the delayed representation of the audio input signal (58), and the second output signal (52) corresponds to the audio input signal (54).
4. Decorrelator of any one of claims 1 to 3, wherein the first and second time intervals are temporally adjacent and successive.
5. Decorrelator of any one of claims 1 to 4, further comprising a delaying means (56) so as to generate the delayed representation of the audio input signal (58) by time-delaying the audio input signal (54) by the delay time.
6. Decorrelator of any one of claims 1 to 5, further comprising scaling means (74) so as to alter an intensity of the audio input signal (54) and/or the delayed representation of the audio input signal (58).
7. Decorrelator of claim 6, wherein the scaling means (74) is configured to scale the intensity of the audio input signal (54) in dependence on the delay time such that a larger decrease in the intensity of the audio input signal (54) is obtained with a shorter delay time.
8. Decorrelator of any one of the preceding claims, further comprising a post-processor (80) for combining the first (50) and the second output signal (52) so as to obtain a first (82) and a second (84) post-processed output signal, both the first (82) and the second (84) post-processed output signal comprising signal contributions from the first (50) and second (52) output signals.
9. Decorrelator of claim 8, wherein the post-processor (80) is configured to form the first post-processed output signal M(82) and the second post-processed output signal D (84) from the first output signal L' (50) and the second output signal R' (52) such that the following conditions are met:
M = 0.707 × (L' + R'), and D = 0.707 × (L' - R').
M = 0.707 × (L' + R'), and D = 0.707 × (L' - R').
10. Decorrelator of any one of the preceding claims, wherein the mixer (60) is configured to use a delayed representation of the audio input signal (58) the delay time of which is greater than 2 ms and less than 50 ms.
11. Decorrelator of claim 7, wherein the delay time amounts to 3, 6, 9, 12, 15 or 30 ms.
12. Decorrelator of any one of the preceding claims, wherein the mixer (60) is configured to combine an audio input signal (54) consisting of discrete samples and a delayed representation of the audio input signal (58) consisting of discrete samples by swapping the samples of the audio input signal (54) and the samples of the delayed representation of the audio input signal (58).
13. Decorrelator of any one of the preceding claims, wherein the mixer (60) is configured to combine the audio input signal (54) and the delayed representation of the audio input signal (58) such that the first and second time intervals have the same length.
14. Decorrelator of any one of the preceding claims, wherein the mixer (60) is configured to perform the combination of the audio input signal (54) and the delayed representation of the audio input signal (58) for a sequence of pairs of temporally adjacent first (70) and second (72) time intervals.
15. Decorrelator of claim 15, wherein the mixer (60) is configured to refrain, with a predetermined probability, for one pair of the sequence of pairs of temporally adjacent first (70) and second (72) time intervals, from the combination so that, in the pair in the first (70) and second (72) time intervals, the first output signal (50) corresponds to the audio input signal (54) and the second output signal (52) corresponds to the delayed representation of the audio input signal (58).
16. Decorrelator of claims 14 or 15, wherein the mixer (60) is configured to perform the combination such that the time period of the time intervals in a first pair of a first (70) and a second (72) time interval from the sequence of time intervals differs from a time period of the time intervals in a second pair of a first and a second time interval.
17. Decorrelator of any one of the preceding claims, wherein the time period of the first (70) and the second (72) time intervals is larger than the double average time period of transient signal portions contained in the audio input signal (54).
18. Decorrelator of any one of the preceding claims, wherein the time period of the first (70) and second (72) time intervals is larger than 10 ms and less than 200 ms.
19. Method of generating output signals (50, 52) based on an audio input signal (54), comprising:
combining a representation of the audio input signal delayed by a delay time (58) with the audio signal (54) so as to obtain a first (50) and a second (52) output signal having time-varying portions of the audio input signal (54) and the delayed representation of the audio input signal (58), wherein in a first time interval (70), the first output signal (50) contains a proportion of more than 50 percent of the audio input signal (54), and the second output signal (52) contains a proportion of more than 50 percent of the delayed representation of the audio input signal (58), and wherein in a second time interval (72), the first output signal (50) contains a proportion of more than 50 percent of the delayed representation of the audio input signal (58), and the second output signal (52) contains a proportion of more than 50 percent of the audio input signal (54).
combining a representation of the audio input signal delayed by a delay time (58) with the audio signal (54) so as to obtain a first (50) and a second (52) output signal having time-varying portions of the audio input signal (54) and the delayed representation of the audio input signal (58), wherein in a first time interval (70), the first output signal (50) contains a proportion of more than 50 percent of the audio input signal (54), and the second output signal (52) contains a proportion of more than 50 percent of the delayed representation of the audio input signal (58), and wherein in a second time interval (72), the first output signal (50) contains a proportion of more than 50 percent of the delayed representation of the audio input signal (58), and the second output signal (52) contains a proportion of more than 50 percent of the audio input signal (54).
20. Method of claim 19, wherein, in the first time interval (70), the first output signal corresponds to the audio input signal (54), and the second output signal (52) corresponds to the delayed representation of the audio input signal (58), wherein in the second time interval (72), the first output signal (50) corresponds to the delayed representation of the audio input signal (58), and the second output signal (52) corresponds to the audio input signal (54).
21. Method of claim 19, wherein, in a begin interval and in an end interval at the beginning and at the end of the first time interval (70), the first output signal and the second output signal (52) contain portions of the audio input signal (54) and the delayed representation of the audio input signal (58), wherein in an intermediate interval between the begin interval and the end interval of the first time interval, the first output signal corresponds to the audio input signal (54), and the second output signal (52) corresponds to the delayed representation of the audio input signal (58); and wherein in a begin interval and in an end interval at the beginning and at the end of the second time interval (70), the first output signal and the second output signal (52) contain portions of the audio input signal (54) and the delayed representation of the audio input signal (58), wherein in an intermediate interval between the begin interval and the end interval of the second time interval, the first output signal corresponds to the delayed representation of the audio input signal (58), and the second output signal (52) corresponds to the audio input signal (54).
22. Method of any one of claims 19 to 21, additionally comprising:
delaying the audio input signal (54) by the delay time so as to obtain the delayed representation of the audio input signal (58).
delaying the audio input signal (54) by the delay time so as to obtain the delayed representation of the audio input signal (58).
23. Method of any one of claims 19 to 22, additionally comprising:
altering the intensity of the audio input signal (54) and/or the delayed representation of the audio input signal (58).
altering the intensity of the audio input signal (54) and/or the delayed representation of the audio input signal (58).
24. Method of any one of claims 19 to 23, additionally comprising:
combining the first (50) and the second (52) output signal so as to obtain a first (82) and a second (84) post-processed output signal, both the first (82) and the second (84) post-processed output signals containing contributions of the first and the second output signals.
combining the first (50) and the second (52) output signal so as to obtain a first (82) and a second (84) post-processed output signal, both the first (82) and the second (84) post-processed output signals containing contributions of the first and the second output signals.
25. Audio decoder for generating a multi-channel output signal based on an audio input signal (54), comprising:
a decorrelator of any one of claims 1 to 18; and a standard decorrelator, wherein the audio decoder is configured to use, in a standard mode of operation, the standard decorrelator, and to use, in the case of a transient audio input signal (54), the inventive decorrelator.
a decorrelator of any one of claims 1 to 18; and a standard decorrelator, wherein the audio decoder is configured to use, in a standard mode of operation, the standard decorrelator, and to use, in the case of a transient audio input signal (54), the inventive decorrelator.
26. Computer program with a program code for performing the method of any one of claims 19 to 24 when the program runs on a computer.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007018032A DE102007018032B4 (en) | 2007-04-17 | 2007-04-17 | Generation of decorrelated signals |
| DE102007018032.4 | 2007-04-17 | ||
| PCT/EP2008/002945 WO2008125322A1 (en) | 2007-04-17 | 2008-04-14 | Generation of decorrelated signals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2664312A1 true CA2664312A1 (en) | 2008-10-23 |
| CA2664312C CA2664312C (en) | 2014-09-30 |
Family
ID=39643877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2664312A Active CA2664312C (en) | 2007-04-17 | 2008-04-14 | Generation of decorrelated signals |
Country Status (16)
| Country | Link |
|---|---|
| US (1) | US8145499B2 (en) |
| EP (1) | EP2036400B1 (en) |
| JP (1) | JP4682262B2 (en) |
| KR (1) | KR101104578B1 (en) |
| CN (1) | CN101543098B (en) |
| AT (1) | ATE452514T1 (en) |
| AU (1) | AU2008238230B2 (en) |
| CA (1) | CA2664312C (en) |
| DE (2) | DE102007018032B4 (en) |
| HK (1) | HK1124468A1 (en) |
| IL (1) | IL196890A0 (en) |
| MY (1) | MY145952A (en) |
| RU (1) | RU2411693C2 (en) |
| TW (1) | TWI388224B (en) |
| WO (1) | WO2008125322A1 (en) |
| ZA (1) | ZA200900801B (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8504377B2 (en) * | 2007-11-21 | 2013-08-06 | Lg Electronics Inc. | Method and an apparatus for processing a signal using length-adjusted window |
| JP5524237B2 (en) * | 2008-12-19 | 2014-06-18 | ドルビー インターナショナル アーベー | Method and apparatus for applying echo to multi-channel audio signals using spatial cue parameters |
| CN103180898B (en) | 2010-08-25 | 2015-04-08 | 弗兰霍菲尔运输应用研究公司 | Apparatus for decoding a signal comprising transients using a combining unit and a mixer |
| EP2477188A1 (en) * | 2011-01-18 | 2012-07-18 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Encoding and decoding of slot positions of events in an audio signal frame |
| CN103139930B (en) | 2011-11-22 | 2015-07-08 | 华为技术有限公司 | Connection establishment method and user devices |
| US9424859B2 (en) * | 2012-11-21 | 2016-08-23 | Harman International Industries Canada Ltd. | System to control audio effect parameters of vocal signals |
| TWI618050B (en) | 2013-02-14 | 2018-03-11 | 杜比實驗室特許公司 | Method and apparatus for signal decorrelation in an audio processing system |
| RU2630370C9 (en) * | 2013-02-14 | 2017-09-26 | Долби Лабораторис Лайсэнзин Корпорейшн | Methods of management of the interchannel coherence of sound signals that are exposed to the increasing mixing |
| TWI618051B (en) | 2013-02-14 | 2018-03-11 | 杜比實驗室特許公司 | Audio signal processing method and apparatus for audio signal enhancement using estimated spatial parameters |
| WO2014126688A1 (en) | 2013-02-14 | 2014-08-21 | Dolby Laboratories Licensing Corporation | Methods for audio signal transient detection and decorrelation control |
| EP2954635B1 (en) * | 2013-02-19 | 2021-07-28 | Huawei Technologies Co., Ltd. | Frame structure for filter bank multi-carrier (fbmc) waveforms |
| JP6248186B2 (en) * | 2013-05-24 | 2017-12-13 | ドルビー・インターナショナル・アーベー | Audio encoding and decoding method, corresponding computer readable medium and corresponding audio encoder and decoder |
| WO2015017223A1 (en) * | 2013-07-29 | 2015-02-05 | Dolby Laboratories Licensing Corporation | System and method for reducing temporal artifacts for transient signals in a decorrelator circuit |
| RU2648947C2 (en) * | 2013-10-21 | 2018-03-28 | Долби Интернэшнл Аб | Parametric reconstruction of audio signals |
| EP2866227A1 (en) | 2013-10-22 | 2015-04-29 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method for decoding and encoding a downmix matrix, method for presenting audio content, encoder and decoder for a downmix matrix, audio encoder and audio decoder |
| WO2015173423A1 (en) * | 2014-05-16 | 2015-11-19 | Stormingswiss Sàrl | Upmixing of audio signals with exact time delays |
| US11234072B2 (en) | 2016-02-18 | 2022-01-25 | Dolby Laboratories Licensing Corporation | Processing of microphone signals for spatial playback |
| US10560661B2 (en) | 2017-03-16 | 2020-02-11 | Dolby Laboratories Licensing Corporation | Detecting and mitigating audio-visual incongruence |
| CN110740416B (en) * | 2019-09-27 | 2021-04-06 | 广州励丰文化科技股份有限公司 | Audio signal processing method and device |
| CN110740404B (en) * | 2019-09-27 | 2020-12-25 | 广州励丰文化科技股份有限公司 | Audio correlation processing method and audio processing device |
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| US4792974A (en) * | 1987-08-26 | 1988-12-20 | Chace Frederic I | Automated stereo synthesizer for audiovisual programs |
| US6526091B1 (en) | 1998-08-17 | 2003-02-25 | Telefonaktiebolaget Lm Ericsson | Communication methods and apparatus based on orthogonal hadamard-based sequences having selected correlation properties |
| US6175631B1 (en) * | 1999-07-09 | 2001-01-16 | Stephen A. Davis | Method and apparatus for decorrelating audio signals |
| AUPQ942400A0 (en) * | 2000-08-15 | 2000-09-07 | Lake Technology Limited | Cinema audio processing system |
| US7107110B2 (en) * | 2001-03-05 | 2006-09-12 | Microsoft Corporation | Audio buffers with audio effects |
| SE0301273D0 (en) * | 2003-04-30 | 2003-04-30 | Coding Technologies Sweden Ab | Advanced processing based on a complex exponential-modulated filter bank and adaptive time signaling methods |
| CA2992065C (en) * | 2004-03-01 | 2018-11-20 | Dolby Laboratories Licensing Corporation | Reconstructing audio signals with multiple decorrelation techniques |
| KR101097000B1 (en) * | 2004-03-11 | 2011-12-20 | 피에스에스 벨기에 엔브이 | A method and system for processing sound signals |
| ATE444549T1 (en) * | 2004-07-14 | 2009-10-15 | Koninkl Philips Electronics Nv | SOUND CHANNEL CONVERSION |
| US7508947B2 (en) * | 2004-08-03 | 2009-03-24 | Dolby Laboratories Licensing Corporation | Method for combining audio signals using auditory scene analysis |
| TWI393121B (en) * | 2004-08-25 | 2013-04-11 | Dolby Lab Licensing Corp | Method and apparatus for processing a set of n audio signals, and computer program associated therewith |
| CN101040322A (en) * | 2004-10-15 | 2007-09-19 | 皇家飞利浦电子股份有限公司 | A system and a method of processing audio data, a program element, and a computer-readable medium |
| SE0402649D0 (en) * | 2004-11-02 | 2004-11-02 | Coding Tech Ab | Advanced methods of creating orthogonal signals |
| CN101138274B (en) * | 2005-04-15 | 2011-07-06 | 杜比国际公司 | Envelope shaping of decorrelated signals |
| JP2007065497A (en) * | 2005-09-01 | 2007-03-15 | Matsushita Electric Ind Co Ltd | Signal processing apparatus |
-
2007
- 2007-04-17 DE DE102007018032A patent/DE102007018032B4/en not_active Expired - Fee Related
-
2008
- 2008-04-14 AU AU2008238230A patent/AU2008238230B2/en active Active
- 2008-04-14 MY MYPI20091415A patent/MY145952A/en unknown
- 2008-04-14 CA CA2664312A patent/CA2664312C/en active Active
- 2008-04-14 WO PCT/EP2008/002945 patent/WO2008125322A1/en active Application Filing
- 2008-04-14 CN CN2008800005968A patent/CN101543098B/en active Active
- 2008-04-14 KR KR1020097008644A patent/KR101104578B1/en active IP Right Grant
- 2008-04-14 JP JP2009529719A patent/JP4682262B2/en active Active
- 2008-04-14 AT AT08735224T patent/ATE452514T1/en active
- 2008-04-14 DE DE502008000252T patent/DE502008000252D1/en active Active
- 2008-04-14 EP EP08735224A patent/EP2036400B1/en active Active
- 2008-04-14 US US12/440,940 patent/US8145499B2/en active Active
- 2008-04-14 RU RU2009116268/09A patent/RU2411693C2/en active
- 2008-04-16 TW TW097113879A patent/TWI388224B/en active
-
2009
- 2009-02-03 ZA ZA2009/00801A patent/ZA200900801B/en unknown
- 2009-02-04 IL IL196890A patent/IL196890A0/en active IP Right Grant
- 2009-04-23 HK HK09103754.1A patent/HK1124468A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CA2664312C (en) | 2014-09-30 |
| KR101104578B1 (en) | 2012-01-11 |
| DE102007018032A1 (en) | 2008-10-23 |
| ATE452514T1 (en) | 2010-01-15 |
| CN101543098A (en) | 2009-09-23 |
| IL196890A0 (en) | 2009-11-18 |
| TW200904229A (en) | 2009-01-16 |
| EP2036400B1 (en) | 2009-12-16 |
| MY145952A (en) | 2012-05-31 |
| JP2010504715A (en) | 2010-02-12 |
| US20090326959A1 (en) | 2009-12-31 |
| EP2036400A1 (en) | 2009-03-18 |
| KR20090076939A (en) | 2009-07-13 |
| AU2008238230B2 (en) | 2010-08-26 |
| DE502008000252D1 (en) | 2010-01-28 |
| DE102007018032B4 (en) | 2010-11-11 |
| HK1124468A1 (en) | 2009-07-10 |
| JP4682262B2 (en) | 2011-05-11 |
| RU2009116268A (en) | 2010-11-10 |
| WO2008125322A1 (en) | 2008-10-23 |
| CN101543098B (en) | 2012-09-05 |
| AU2008238230A1 (en) | 2008-10-23 |
| RU2411693C2 (en) | 2011-02-10 |
| TWI388224B (en) | 2013-03-01 |
| US8145499B2 (en) | 2012-03-27 |
| ZA200900801B (en) | 2010-02-24 |
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