WO2006019719A1 - Combining audio signals using auditory scene analysis - Google Patents
Combining audio signals using auditory scene analysis Download PDFInfo
- Publication number
- WO2006019719A1 WO2006019719A1 PCT/US2005/024630 US2005024630W WO2006019719A1 WO 2006019719 A1 WO2006019719 A1 WO 2006019719A1 US 2005024630 W US2005024630 W US 2005024630W WO 2006019719 A1 WO2006019719 A1 WO 2006019719A1
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- channel
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- audio
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
- H04S3/02—Systems employing more than two channels, e.g. quadraphonic of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/20—Circuits for coupling gramophone pick-up, recorder output, or microphone to receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
-
- 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
Definitions
- FIG. 2 is a functional schematic block diagram of an audio signal process or processing method embodying aspects of the present invention.
- FIG. 3 is a functional schematic block diagram showing the Time and
- the normalized frequency spectrum for a current block may be compared to the normalized spectrum from the next previous block to obtain a measure of their difference.
- a single difference measure may be calculated by summing the absolute value of the difference in the dB spectral values of the current and next previous spectrums. Such difference measure may then be compared to a threshold. If the difference measure is greater than the threshold, an event boundary is indicated between the current and previous block, otherwise no event boundary is indicated between the current and previous block.
- a suitable value for this threshold has been found to be 2500 (in units of dB). Thus, event boundaries may be determined within an accuracy of about half a block.
- the cross-correlation may be performed using standard FFT based techniques to reduce execution time. Since both S 1 and S 2 are finite in length, the non-zero component of R 1 2 has a length of Ni +N 2 -1. The lag / corresponding to the maximum element in R 12 represents the delay of S 2 relative to -S 1 .
- both CaIc Delays 301 and Delays 305-1 through 305-P may operate in the frequency domain, in which case Delays 305-1 through 305-P perform phase adjustments to bands or subbands, rather than delays in the time domain.
- signals 306- 1 through 306-P are already in the frequency domain, negating the need for a subsequent Filterbank 401 (FIG. 4, as described below).
- a useful value for ⁇ b) has been found to be 0.5 except for bands below approximately 200 Hz. Below this frequency, ⁇ (b) tends toward a final value of 0 at band b—0 or DC. If the smoothed gains G 5 are initialized to 1.0, the value at DC stays equal to 1.0. That is, DC will never be gain adjusted and the gain of bands below 200 Hz will vary more slowly than bands in the rest of the spectrum. This may be useful in preventing audible modulations at lower frequencies. This is because at frequencies lower than 200 Hz, the wavelength of such frequencies approaches or exceeds the block size used by the filterbank, leading to inaccuracies in the filterbanks' ability to accurately discriminate these frequencies. This is a common and well- known phenomenon.
- FIGS. 7a and 7b show the room or spatial locations of two sets of audio channels.
- device or process 702 may assume a priori knowledge of the spatial locations of the content channels. Information regarding the number and spatial location of the additional intermediate channels may be assumed or may be passed to the device or process 702 from the decorrelating device or process 701 via path 703. This enables process or device 702 to combine the additional intermediate channels into, for example, the nearest two playback channels so that phantom image direction of these additional channels is maintained.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Mathematical Analysis (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mathematical Optimization (AREA)
- Mathematical Physics (AREA)
- Pure & Applied Mathematics (AREA)
- Algebra (AREA)
- Stereophonic System (AREA)
- Electrophonic Musical Instruments (AREA)
- Complex Calculations (AREA)
- Holo Graphy (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
- Electrically Operated Instructional Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
Description
Claims
Priority Applications (14)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007524817A JP4740242B2 (en) | 2004-08-03 | 2005-07-13 | Audio signal combination using auditory scene analysis |
DE602005021648T DE602005021648D1 (en) | 2004-08-03 | 2005-07-13 | COMBINATION OF SOUND SIGNALS BY AUDITOR SCENIC ANALYSIS |
CA2574834A CA2574834C (en) | 2004-08-03 | 2005-07-13 | Combining audio signals using auditory scene analysis |
MX2007001262A MX2007001262A (en) | 2004-08-03 | 2005-07-13 | Combining audio signals using auditory scene analysis. |
KR1020077002358A KR101161703B1 (en) | 2004-08-03 | 2005-07-13 | Combining audio signals using auditory scene analysis |
EP05770949A EP1787495B1 (en) | 2004-08-03 | 2005-07-13 | Combining audio signals using auditory scene analysis |
BRPI0514059-5A BRPI0514059B1 (en) | 2004-08-03 | 2005-07-13 | process and apparatus for mixing three input audio channels into two output audio channels |
AU2005275257A AU2005275257B2 (en) | 2004-08-03 | 2005-07-13 | Combining audio signals using auditory scene analysis |
DK05770949.5T DK1787495T3 (en) | 2004-08-03 | 2005-07-13 | Combination of audio signals using auditory scene analysis |
AT05770949T ATE470322T1 (en) | 2004-08-03 | 2005-07-13 | COMBINATION OF SOUND SIGNALS USING AUDITORIAL SCENE ANALYSIS |
PL05770949T PL1787495T3 (en) | 2004-08-03 | 2005-07-13 | Combining audio signals using auditory scene analysis |
CN2005800261496A CN101002505B (en) | 2004-08-03 | 2005-07-13 | Method for combining audio signals using auditory scene analysis and device |
IL180712A IL180712A (en) | 2004-08-03 | 2007-01-15 | Combining audio signals using auditory scene analysis |
HK07106095.4A HK1101053A1 (en) | 2004-08-03 | 2007-06-07 | Combining audio signals using auditory scene analysis |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/911,404 | 2004-08-03 | ||
US10/911,404 US7508947B2 (en) | 2004-08-03 | 2004-08-03 | Method for combining audio signals using auditory scene analysis |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006019719A1 true WO2006019719A1 (en) | 2006-02-23 |
Family
ID=35115846
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2005/024630 WO2006019719A1 (en) | 2004-08-03 | 2005-07-13 | Combining audio signals using auditory scene analysis |
Country Status (19)
Country | Link |
---|---|
US (1) | US7508947B2 (en) |
EP (1) | EP1787495B1 (en) |
JP (1) | JP4740242B2 (en) |
KR (1) | KR101161703B1 (en) |
CN (1) | CN101002505B (en) |
AT (1) | ATE470322T1 (en) |
AU (1) | AU2005275257B2 (en) |
BR (1) | BRPI0514059B1 (en) |
CA (1) | CA2574834C (en) |
DE (1) | DE602005021648D1 (en) |
DK (1) | DK1787495T3 (en) |
ES (1) | ES2346070T3 (en) |
HK (1) | HK1101053A1 (en) |
IL (1) | IL180712A (en) |
MX (1) | MX2007001262A (en) |
MY (1) | MY139731A (en) |
PL (1) | PL1787495T3 (en) |
TW (1) | TWI374435B (en) |
WO (1) | WO2006019719A1 (en) |
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US7508947B2 (en) | 2004-08-03 | 2009-03-24 | Dolby Laboratories Licensing Corporation | Method for combining audio signals using auditory scene analysis |
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Also Published As
Publication number | Publication date |
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CN101002505B (en) | 2011-08-10 |
BRPI0514059A (en) | 2008-05-27 |
IL180712A (en) | 2012-02-29 |
US20060029239A1 (en) | 2006-02-09 |
TWI374435B (en) | 2012-10-11 |
JP4740242B2 (en) | 2011-08-03 |
EP1787495B1 (en) | 2010-06-02 |
AU2005275257A1 (en) | 2006-02-23 |
US7508947B2 (en) | 2009-03-24 |
CA2574834A1 (en) | 2006-02-23 |
CN101002505A (en) | 2007-07-18 |
KR101161703B1 (en) | 2012-07-03 |
IL180712A0 (en) | 2007-06-03 |
HK1101053A1 (en) | 2007-10-05 |
TW200608352A (en) | 2006-03-01 |
EP1787495A1 (en) | 2007-05-23 |
CA2574834C (en) | 2013-07-09 |
PL1787495T3 (en) | 2010-10-29 |
AU2005275257B2 (en) | 2011-02-03 |
MX2007001262A (en) | 2007-04-18 |
ES2346070T3 (en) | 2010-10-08 |
DK1787495T3 (en) | 2010-09-06 |
KR20070049146A (en) | 2007-05-10 |
DE602005021648D1 (en) | 2010-07-15 |
BRPI0514059B1 (en) | 2019-11-12 |
JP2008509600A (en) | 2008-03-27 |
ATE470322T1 (en) | 2010-06-15 |
MY139731A (en) | 2009-10-30 |
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