GB2353926B - Method and apparatus for generating a second audio signal from a first audio signal - Google Patents

Method and apparatus for generating a second audio signal from a first audio signal

Info

Publication number
GB2353926B
GB2353926B GB9920811A GB9920811A GB2353926B GB 2353926 B GB2353926 B GB 2353926B GB 9920811 A GB9920811 A GB 9920811A GB 9920811 A GB9920811 A GB 9920811A GB 2353926 B GB2353926 B GB 2353926B
Authority
GB
United Kingdom
Prior art keywords
delayed
signal
audio signal
gain
audio
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
GB9920811A
Other versions
GB9920811D0 (en
GB2353926A (en
Inventor
Michael Percy
Alastair Sibbald
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Central Research Laboratories Ltd
Original Assignee
Central Research Laboratories Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Central Research Laboratories Ltd filed Critical Central Research Laboratories Ltd
Priority to GB9920811A priority Critical patent/GB2353926B/en
Publication of GB9920811D0 publication Critical patent/GB9920811D0/en
Priority to AT00956732T priority patent/ATE265128T1/en
Priority to PCT/GB2000/003393 priority patent/WO2001019138A2/en
Priority to EP00956732A priority patent/EP1212923B1/en
Priority to DE60010100T priority patent/DE60010100D1/en
Publication of GB2353926A publication Critical patent/GB2353926A/en
Application granted granted Critical
Publication of GB2353926B publication Critical patent/GB2353926B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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 

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

A method of generating a second decorrelated audio signal from a first audio signal 2, for use in synthesising a 3D sound field, includes :- a) deriving from the first signal a first delayed signal using an audio delay line 1; b) multiplying this first delayed signal by a gain factor G<SB>Q</SB> between zero and minus one to give a first delayed gain-adjusted signal; c) deriving from the first audio signal a second delayed signal, having a different delay time from the first delayed signal; d) multiplying this second delayed signal by a gain factor G<SB>R</SB> between zero and plus one (such that the said gain factors sum to zero) to give a second delayed gain-adjusted signal; e) combining said first and said second delayed gain-adjusted signals with the first audio signal to provide a second decorrelated audio signal DDC. The first and second delayed signals are delayed by time periods which change in a substantially random manner. Each of the first and second delayed signals may be derived from two taps Q<SB>1</SB>,Q<SB>2</SB> and R<SB>1</SB>,R<SB>2</SB> of the audio delay line 1, the signals from the taps being crossfaded.
GB9920811A 1999-09-04 1999-09-04 Method and apparatus for generating a second audio signal from a first audio signal Expired - Lifetime GB2353926B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB9920811A GB2353926B (en) 1999-09-04 1999-09-04 Method and apparatus for generating a second audio signal from a first audio signal
AT00956732T ATE265128T1 (en) 1999-09-04 2000-09-04 METHOD AND ARRANGEMENT FOR GENERATING A SECOND AUDIO SIGNAL FROM A FIRST AUDIO SIGNAL
PCT/GB2000/003393 WO2001019138A2 (en) 1999-09-04 2000-09-04 Method and apparatus for generating a second audio signal from a first audio signal
EP00956732A EP1212923B1 (en) 1999-09-04 2000-09-04 Method and apparatus for generating a second audio signal from a first audio signal
DE60010100T DE60010100D1 (en) 1999-09-04 2000-09-04 METHOD AND ARRANGEMENT FOR GENERATING A SECOND AUDIO SIGNAL FROM A FIRST AUDIO SIGNAL

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9920811A GB2353926B (en) 1999-09-04 1999-09-04 Method and apparatus for generating a second audio signal from a first audio signal

Publications (3)

Publication Number Publication Date
GB9920811D0 GB9920811D0 (en) 1999-11-10
GB2353926A GB2353926A (en) 2001-03-07
GB2353926B true GB2353926B (en) 2003-10-29

Family

ID=10860265

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9920811A Expired - Lifetime GB2353926B (en) 1999-09-04 1999-09-04 Method and apparatus for generating a second audio signal from a first audio signal

Country Status (5)

Country Link
EP (1) EP1212923B1 (en)
AT (1) ATE265128T1 (en)
DE (1) DE60010100D1 (en)
GB (1) GB2353926B (en)
WO (1) WO2001019138A2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2323294T3 (en) 2002-04-22 2009-07-10 Koninklijke Philips Electronics N.V. DECODING DEVICE WITH A DECORRELATION UNIT.
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
FR2853804A1 (en) * 2003-07-11 2004-10-15 France Telecom Audio signal decoding process, involves constructing uncorrelated signal from audio signals based on audio signal frequency transformation, and joining audio and uncorrelated signals to generate signal representing acoustic scene
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
KR101137359B1 (en) 2006-09-14 2012-04-25 엘지전자 주식회사 Dialogue enhancement techniques

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4625326A (en) * 1983-11-17 1986-11-25 U.S. Philips Corporation Apparatus for generating a pseudo-stereo signal
US5555306A (en) * 1991-04-04 1996-09-10 Trifield Productions Limited Audio signal processor providing simulated source distance control
WO1998030064A1 (en) * 1996-12-28 1998-07-09 Central Research Laboratories Limited Processing audio signals

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2158451A1 (en) * 1993-03-18 1994-09-29 Alastair Sibbald Plural-channel sound processing
JP2959361B2 (en) * 1993-10-21 1999-10-06 ヤマハ株式会社 Reverberation device
US5774560A (en) * 1996-05-30 1998-06-30 Industrial Technology Research Institute Digital acoustic reverberation filter network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4625326A (en) * 1983-11-17 1986-11-25 U.S. Philips Corporation Apparatus for generating a pseudo-stereo signal
US5555306A (en) * 1991-04-04 1996-09-10 Trifield Productions Limited Audio signal processor providing simulated source distance control
WO1998030064A1 (en) * 1996-12-28 1998-07-09 Central Research Laboratories Limited Processing audio signals

Also Published As

Publication number Publication date
EP1212923A2 (en) 2002-06-12
EP1212923B1 (en) 2004-04-21
DE60010100D1 (en) 2004-05-27
ATE265128T1 (en) 2004-05-15
WO2001019138A3 (en) 2001-11-15
WO2001019138A2 (en) 2001-03-15
GB9920811D0 (en) 1999-11-10
GB2353926A (en) 2001-03-07

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Expiry date: 20190903