Global Patent Index - EP 0630168 B1

EP 0630168 B1 2001-04-04 - Improved Dolby prologic decoder

Title (en)

Improved Dolby prologic decoder

Title (de)

Dolby-Prologic-Dekodierer

Title (fr)

Décodeur prologic Dolby

Publication

EP 0630168 B1 (EN)

Application

EP 94108673 A

Priority

FI 932735 A

Abstract (en)

[origin: EP0630168A1] The nucleus block of a Dolby Prologic decoder comprises two main sections: an adaptation section (21) and a matrix section (22) comprising voltage controlled amplifiers VCA. The adaptive section examines the two channel input signal to find in which direction the dominance of the sound field is located, and then generates control signals controlling the amplifiers of the matrix section. In this way we obtain the four channel output signal (R, L, C and S). According to the invention the two channel audio signal (Lt, Rt) is supplied to a block performing linear signal processing operations and processing separately the signal of both channels. The two channel output signal of the DSP block is the input signal of the matrix section (22). In this way it is possible to affect all four output channels by processing only two channels, without otherwise interfering with the function of the decoder. <IMAGE>

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

H04S 3/00

IPC 8 full level (invention and additional information)

H04S 3/02 (2006.01)

CPC (invention and additional information)

H04S 3/02 (2013.01)

Designated contracting state (EPC)

DE FR GB IT NL

EPO simple patent family

EP 0630168 A1 19941221; EP 0630168 B1 20010404; DE 69427001 D1 20010510; DE 69427001 T2 20010906; FI 102799 B1 19990215; FI 102799 B 19990215; FI 932735 A0 19930615; FI 932735 A 19941216

INPADOC legal status


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2001-09-03 [NLV1] NL: LAPSED OR ANNULLED DUE TO FAILURE TO FULFILL THE REQUIREMENTS OF ART. 29P AND 29M OF THE PATENTS ACT

2001-07-13 [ET] FR: TRANSLATION FILED

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2001-05-10 [REF] CORRESPONDS TO:

- Document: DE 69427001 20010510

2001-04-09 [ITF] IT: TRANSLATION FOR A EP PATENT FILED

- Owner name: JACOBACCI & PERANI S.P.A.

2001-04-04 [AK] DESIGNATED CONTRACTING STATES:

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2001-04-04 [PG25 NL] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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