Title:
【発明の名称】圧縮方法及び装置、伝送方法、マルチチャンネル圧縮音声信号の伸長方法及び装置、並びにマルチチャンネル圧縮音声信号の記録媒体
Document Type and Number:
Japanese Patent JPH09500252
Kind Code:
A
Abstract:
PCT No. PCT/US94/14267 Sec. 371 Date Nov. 20, 1995 Sec. 102(e) Date Nov. 20, 1995 PCT Filed Dec. 7, 1994A multi-channel signal compressor for compressing digital sound signals in the respective channels of a multi-channel sound system. The apparatus comprises a first-stage compression system and a second-stage compression system. In the first-stage compression system, a coupling circuit performs coupling between the digital sound signals of at least two of the channels to generate coupling-processed signals, one for each of the channels. A compressor circuit receives the coupling-processed signals from the coupling circuit and frequency divides each coupling-processed signal into frequency range signals in respective frequency ranges, and compresses the frequency range signals obtained by dividing each coupling-processed signal to generate a first-stage compressed signal. In the second-stage compression system, a determining circuit receives the first-stage compressed signal for each channel from the first-stage compression system and determines an energy for each channel from the first-stage compressed signal of the respective channel. A channel bit apportionment decision circuit operates in response to the determining circuit, and apportions a predetermined number of bits among the channels to apportion a number of bits to each channel. Finally, an additional compressor additionally compresses the first-stage compressed signal of each channel using, for each channel, the number of bits apportioned to the respective channel by the channel bit apportionment decision circuit.
Inventors:
Kenzo Akagi
Davis, Mark Franklin
Todd, Craig Campbell
Dolby, Ray Milton
Davis, Mark Franklin
Todd, Craig Campbell
Dolby, Ray Milton
Application Number:
JP51638095A
Publication Date:
January 07, 1997
Filing Date:
December 07, 1994
Export Citation:
Assignee:
ソニー株式会社
ドルビー ラボラトリーズ ライセンシング コーポレーション
ドルビー ラボラトリーズ ライセンシング コーポレーション
International Classes:
G10L19/00; G10L19/008; G10L19/02; G11B20/00; H03M7/30; H03M7/40; G11B20/10; H04B1/66; H04B14/04; H04H5/00; H04H20/88; H04S1/00; H04S3/00; (IPC1-7): H04S3/00; G11B20/10; H03M7/30; H03M7/40; H04B1/66; H04B14/04
Attorney, Agent or Firm:
Akira Koike (2 outside)