Audio encoder and audio decoder

Details Audio encoder and audio decoder Audio encoder and audio decoder

2005-02-09

2009-11-03

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

Binaural and stereophonic

Quadrasonic

C381S119000, C700S094000

Reexamination Certificate

active

07613306

ABSTRACT:
An audio encoder, generating a stereo signal based on a multi-channel signal, includes a downmix unit for downmixing a multi-channel signal exceeding two channels to a two-channel stereo signal, a first coding unit for generating a first coded signal by coding the downmixed stereo signal, a second coding unit for generating a second coded signal by coding information to restore the downmixed stereo signal to a multi-channel signal, a code size calculating unit for calculating a code size of the second coded signal, and a first multiplexing unit for multiplexing the calculated code size in either the first coded signal or the second coded signal. Accordingly a decoder is able to easily extract a coded signal of the multi-channel signal based on the code size, and the decoder reproducing only the downmixed signal can be configured inexpensively.

REFERENCES:
patent: 5781237 (1998-07-01), Fukuda
patent: 7260540 (2007-08-01), Miyasaka et al.
patent: 2003/0093264 (2003-05-01), Miyasaka et al.
patent: 7-264582 (1995-10-01), None
patent: 2000-295698 (2000-10-01), None
patent: 2001-100792 (2001-04-01), None
patent: 2003-218701 (2003-07-01), None
patent: 03/042981 (2003-05-01), None
Information Technology—“Generic Coding of Moving Pictures and Audio: Audio”, ISO/IEC 13818-3, Feb. 20, 1997, pp. ii-117.

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