Global Patent Index - EP 1064824 A1

EP 1064824 A1 2001-01-03 - POST-AMPLIFICATION STEREOPHONIC TO SURROUND SOUND DECODING CIRCUIT

Title (en)

POST-AMPLIFICATION STEREOPHONIC TO SURROUND SOUND DECODING CIRCUIT

Title (de)

STEREO ZU RAUMKLANG NACHVERSTÄRKUNG- SCHOLLDEKODIERUNGSSCHALTUNG

Title (fr)

CIRCUIT POST-AMPLIFICATION DE DECODAGE DU SON DEPUIS UN MODE STEREOPHONIQUE EN UN MODE SURROUND

Publication

EP 1064824 A1 (EN)

Application

EP 97913055 A

Priority

CA 9700882 W

Abstract (en)

[origin: WO9926455A1] A post-amplification stereophonic to surround sound decoding circuit is described herein. The decoding circuit includes inputs to be connected to a stereophonic power amplifier to receive a powered amplified stereophonic signal and outputs to be connected to left and right main loudspeakers, to left and right secondary loudspeakers and to a central loudspeaker. The decoding circuit includes secondary channels decoding circuit decoding left and right surround channel signals to be supplied to the left and right secondary loudspeakers, respectively, and a central channel decoding circuit decoding a central channel signal to be supplied to the central loudspeaker. The central channel decoding circuit includes two decoupling capacitors decoupling the left and right signals from the powered amplified stereophonic signal before combining these signals to yield the central channel signal. This decoupling action prevents "bleeding" of the left and right signals that would degrade the stereophonic signal.

IPC 1-7 (main, further and additional classification)

H04S 3/00

IPC 8 full level (invention and additional information)

H04S 3/00 (2006.01)

CPC (invention and additional information)

H04S 3/00 (2013.01)

Citation (search report)

See references of WO 9926455A1

Designated contracting state (EPC)

AT BE DE DK ES FR GB IT NL PT

EPO simple patent family

WO 9926455 A1 19990527; AT 218267 T 20020615; AU 5045398 A 19990607; AU 748414 B2 20020606; CA 2308576 A1 19990527; DE 69712926 D1 20020704; DE 69712926 T2 20021128; DK 1064824 T3 20020916; EP 1064824 A1 20010103; EP 1064824 B1 20020529; ES 2176716 T3 20021201; JP 2001523937 A 20011127

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