EP 0357402 A2 19900307 - Sound imaging method and apparatus.
Title (en)
Sound imaging method and apparatus.
Title (de)
Verfahren und Vorrichtung zur Schallbilderzeugung.
Title (fr)
Méthode et appareil de génération d'image sonore.
Publication
Application
Priority
- US 23998188 A 19880902
- US 39898889 A 19890828
Abstract (en)
The illusion of distinct sound sources distributed throughout the three-dimensional space containing the listener is possible using only conventional stereo playback equipment by processing monaural sound signals prior to playback on two spaced-apart transducers. A plurality of such processed signals corresponding to different sound source positions may be mixed using conventional techniques without disturbing the positions of the individual images. Although two loudspeakers are required the sound produced is not conventional stereo, however, each channel of a left/right stereo signal can be separately processed according to the invention and then combined for playback. The sound processing involves dividing each monaural or single channel signal into two signals and then adjusting the differential phase and amplitude of the two channel signals on a frequency dependent basis in accordance with an empirically derived transfer function that has a specific phase and amplitude adjustment for each predetermined frequency interval over the audio spectrum. Each transfer function is empirically derived to relate to a different sound source location and by providing a number of different transfer functions and selecting them accordingly the sound source can be made to appear to move.
IPC 1-7
IPC 8 full level
H04R 5/02 (2006.01); H04R 1/40 (2006.01); H04R 5/00 (2006.01); H04S 1/00 (2006.01); H04S 5/00 (2006.01)
CPC (source: EP KR)
H04R 5/02 (2013.01 - KR); H04S 1/00 (2013.01 - KR); H04S 1/002 (2013.01 - EP); H04S 5/00 (2013.01 - EP); H04S 7/40 (2013.01 - EP); H04S 2400/01 (2013.01 - EP); H04S 2420/03 (2013.01 - EP)
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0357402 A2 19900307; EP 0357402 A3 19911002; EP 0357402 B1 19950531; AR 245858 A1 19940228; AT E123369 T1 19950615; AU 4100089 A 19900308; AU 621655 B2 19920319; BG 60225 B2 19931230; CA 1329911 C 19940531; DE 68922885 D1 19950706; DE 68922885 T2 19951012; DK 433789 A 19900303; DK 433789 D0 19890901; ES 2075053 T3 19951001; FI 894143 A0 19890901; FI 894143 A 19900303; HU T59523 A 19920528; IL 91464 A0 19900429; IL 91464 A 19941128; JP 3205808 B2 20010904; JP H02298200 A 19901210; KR 900005841 A 19900414; KR 930002147 B1 19930326; NO 175229 B 19940606; NO 175229 C 19940914; NO 893522 D0 19890901; NO 893522 L 19900305; NZ 230517 A 19921028; PL 163716 B1 19940429; RU 2092979 C1 19971010
DOCDB simple family (application)
EP 89308778 A 19890830; AR 31484089 A 19890904; AT 89308778 T 19890830; AU 4100089 A 19890901; BG 8966489 A 19890801; CA 610207 A 19890901; DE 68922885 T 19890830; DK 433789 A 19890901; ES 89308778 T 19890830; FI 894143 A 19890901; HU 454589 A 19890901; IL 9146489 A 19890829; JP 22816989 A 19890902; KR 890012767 A 19890902; NO 893522 A 19890901; NZ 23051789 A 19890831; PL 28126689 A 19890901; SU 4614944 A 19890901