Two-stage compression and expansion of coupling processed multi-channel sound signals for transmission and recording
US5873065A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1995 |
| Grant date | Feb 16, 1999 |
| Priority date | — |
| Expiry date | Nov 20, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/10601
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A 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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.