Audio processing unit for mixing L channel and R channel of CD/CD-1 audio signal
US5764775A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1995 |
| Grant date | Jun 9, 1998 |
| Priority date | — |
| Expiry date | Oct 31, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/00992
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Audio process units for controllably mixing L-channel and R-channel portions of a CD/CD-I audio signal each use a single attenuator (or digital multiplier) for developing L*G(LL), L*G(LR), R*G(RR) and R*G(RL) responses to L-channel and R-channel input signals through time sharing processing. This reduces the amount of digital hardware required for developing these responses. The L*G(LL) and R*G(RL) responses are additively combined to generate an L-channel output signal; and the R*G(RL) and R*G(RR) responses are additively combined to generate an R-channel output signal. L*G(LL), L*G(LR), R*G(RL) and R*G(RR) responses are successively generated on a cyclic basis in one type of such audio process unit, using a successive-shift-and-selective-accumulation digital multiplication procedure to generate each response. L*G(LR), L*G(LL), R*G(RL) and R*G(RR) responses are successively generated on a cyclic basis in an altenative type of such audio process unit, using a successive-shift-and-selective-accumulation digital multiplication procedure to generate each response.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.