Channel mixer for multi-channel audio systems
US4049912A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1976 |
| Grant date | Sep 20, 1977 |
| Priority date | — |
| Expiry date | Apr 26, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S5/005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An audio system which achieves a concert hall reverberation effect from a stereo input signal. From two stereo input signals the audio system produces quadraphonic signals suitable for application to four speakers in the pattern of a quadraphonic sound reproduction system. The system applies the stereo input signals to a front pair of speakers substantially without alteration while reverberation is added to the stereo input signals for application to the rear speakers which realistically reproduces the impression of concert hall acoustics in the sound reaching the listener from all four speakers. The reverberation is provided by a channel signal delay scheme in combination with a channel interconnection network which achieves long reverberation times with a high echo density that eliminates objectionable, discrete echo effects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.