发明名称 |
METHOD AND APPARATUS FOR COMPRESSING, METHOD FOR TRANSMITTING, AND METHOD AND APPARATUS FOR EXPANDING COMPRESSED MULTI-CHANNEL SOUND SIGNALS, AND RECORDING MEDIUM FOR COMPRESSED MULTI-CHANNEL SOUND SIGNALS. |
摘要 |
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. |
申请公布号 |
EP0682850(A1) |
申请公布日期 |
1995.11.22 |
申请号 |
EP19950905899 |
申请日期 |
1994.12.07 |
申请人 |
SONY CORPORATION;DOLBY LABORATORIES LICENSING CORPORATION |
发明人 |
AKAGIRI, KENZO;DAVIS, MARK, FRANKLIN;TODD, CRAIG, CAMPBELL;DOLBY, RAY, MILTON |
分类号 |
G11B20/10;G10L19/00;G10L19/008;G10L19/02;G11B20/00;H03M7/30;H03M7/40;H04B1/66;H04B14/04;H04H5/00;H04H20/88;H04S1/00;H04S3/00;(IPC1-7):H04S3/00 |
主分类号 |
G11B20/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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