Audio encoder

Details Audio encoder Audio encoder

2005-08-18

2010-12-07

Vo, Huyen X. (Department: 2626)

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

C704S501000, C704S504000

Reexamination Certificate

active

07848931

ABSTRACT:
An audio encoder, which is capable of encoding multiple-channel signals so that only a downmixed signal is decoded and of further generating specific auxiliary information necessary for dividing the downmixed signal, is provided.An audio encoder (10), which compresses and encodes audio signals of N-channels (N>1), includes a downmixed signal encoding unit (11) which encodes the downmixed signal obtained by downmixing the audio signals, and an auxiliary information generation unit (12a) which generates auxiliary information necessary for decoding the downmixed signal encoded by the downmixed signal encoding unit (11) into N-channel audio signals. The auxiliary information generation unit (12a) includes transformation units (121) and (122) which transform audio signals respectively into frequency domain signals, a detection unit (123) which detects phase difference information and gain ratio information each indicates a degree of difference between frequency domain signals, and a quantization unit (125) which quantizes, for each frequency band, the phase difference information and gain ratio information detected by the detection unit (123) using the quantization precision setting table (124). The quantization precision setting table (124) functions as a division unit which divides a frequency band of a frequency domain signal into plural sub-bands.

REFERENCES:
patent: 5956674 (1999-09-01), Smyth et al.
patent: 7627480 (2009-12-01), Ojanpera
patent: 2003/0236583 (2003-12-01), Baumgarte et al.
patent: 2001-306097 (2001-11-01), None
patent: 2004-78183 (2004-03-01), None
patent: 03/090208 (2003-10-01), None
C. Faller et al. “Binaural Cue Coding-Part II: Schemes and Applications”, IEEE Trans. on Speech and Audio Processing, 2003, vol. 11, No. 6, pp. 520-531.
Text of ISO/IEC 14496-3:2001/FDAM2(Parametric Coding for High Quality Audio), Dec. 2003, pp. iii-116.

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