EP 0630168 B1 20010404 - Improved Dolby prologic decoder
Title (en)
Improved Dolby prologic decoder
Title (de)
Dolby-Prologic-Dekodierer
Title (fr)
Décodeur prologic Dolby
Publication
Application
Priority
FI 932735 A 19930615
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
IPC 8 full level
H04S 3/02 (2006.01)
CPC (source: EP)
H04S 3/02 (2013.01)
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
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
DOCDB simple family (application)
EP 94108673 A 19940607; DE 69427001 T 19940607; FI 932735 A 19930615