Title:
MULTIDIRECTIONAL AUDIO DECODING
Document Type and Number:
WIPO Patent Application WO1998042162
Kind Code:
A3
Abstract:
An audio crosstalk-cancelling network that may be implemented in software, such that when run in real time on a personal computer, the canceller has very low mips requirements and uses a small fraction of available CPU cycles. The network is particularly useful for rendering surround sound images outside the space between left and right computer multimedia loudspeakers when the audio from such sources is reproduced. The network includes two signal feedback paths, each feedback path having a time delay and frequency dependent characteristic. The frequency dependent characteristic represents the smoothed difference in the attenuation in the acoustic path between a transducer and the listener's ear farthest from said transducer and the attenuation in the acoustic path between the same transducer and the listener's ear closest to said same transducer. The smoothed difference in the attenuation is implemented by one or more simple digital filters requiring low processing power.
Inventors:
DAVIS MARK F
FIELDER LOUIS D
FELLERS MATTHEW C
FIELDER LOUIS D
FELLERS MATTHEW C
Application Number:
PCT/US1998/003882
Publication Date:
December 03, 1998
Filing Date:
February 26, 1998
Export Citation:
Assignee:
DOLBY LAB LICENSING CORP (US)
International Classes:
H04S1/00; H04S5/02; H04S3/02; (IPC1-7): H04S3/00
Domestic Patent References:
| WO1996006515A1 | 1996-02-29 | |||
| WO1990000851A1 | 1990-01-25 |
Foreign References:
| US5384851A | 1995-01-24 |
Other References:
NELSON P A ET AL: "ADAPTIVE INVERSE FILTERS FOR STEREOPHONIC SOUND REPRODUCTION", IEEE TRANSACTIONS ON SIGNAL PROCESSING, vol. 40, no. 7, 1 July 1992 (1992-07-01), pages 1621 - 1632, XP000307653
BOURGET C ET AL: "INVERSE FILTERING OF ROOM IMPULSE RESPONSE FOR BINAURAL RECORDING PLAYBACK THROUGH LOUDSPEAKERS", PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH, SIGNAL PROCESSING (ICASSP), DIGITAL SIGNAL PROCESSING. ADELAIDE, APR. 19 - 22, 1994, vol. 3, 19 April 1994 (1994-04-19), INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages III-301 - III-304, XP000529927
BAUCK J ET AL: "GENERALIZED TRANSAURAL STEREO AND APPLICATIONS", JOURNAL OF THE AUDIO ENGINEERING SOCIETY, vol. 44, no. 9, September 1996 (1996-09-01), pages 683 - 705, XP000699723
BOURGET C ET AL: "INVERSE FILTERING OF ROOM IMPULSE RESPONSE FOR BINAURAL RECORDING PLAYBACK THROUGH LOUDSPEAKERS", PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH, SIGNAL PROCESSING (ICASSP), DIGITAL SIGNAL PROCESSING. ADELAIDE, APR. 19 - 22, 1994, vol. 3, 19 April 1994 (1994-04-19), INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages III-301 - III-304, XP000529927
BAUCK J ET AL: "GENERALIZED TRANSAURAL STEREO AND APPLICATIONS", JOURNAL OF THE AUDIO ENGINEERING SOCIETY, vol. 44, no. 9, September 1996 (1996-09-01), pages 683 - 705, XP000699723
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