Matrix four-channel decoding system
US3952157A · kind A · utility
8Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1974 |
| Grant date | Apr 20, 1976 |
| Priority date | — |
| Expiry date | Mar 4, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S3/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A matrix four-channel decoding system wherein the mixing coefficients or mixing ratios of left and right composite signals of medium frequency range are continuously changed in accordance with the level conditions of directional audio input signals contained in the composite signals and the mixing coefficients or mixing ratios of the left and right composite signals of low and high frequency ranges are substantially fixed, thereby attaining the more natural four-channel reproduction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.