Microphone system for producing signals for quadraphonic reproduction
US4072821A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 1976 |
| Grant date | Feb 7, 1978 |
| Priority date | — |
| Expiry date | May 10, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S2400/15
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system including a compact array of special purpose microphones and an encoder, especially suited for use with surround-sound sources, for producing two composite output signals equivalent to those required by the "SQ" quadraphonic system to establish the directional position of the sources. The output signals from the system can be used directly to record an "SQ"-matrixed tape, or they can be applied to a disc cutter to produce an "SQ" record, or they can be broadcast for reception by FM receivers equipped with an "SQ" decoder, resulting in the generation of outputs in the quadraphonic "SQ" listening system which reproduce the directional characteristic of the original sound sources. Thus, the system performs the function of a conventional multimicrophone and encoder system for "SQ" recording or broadcasting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.