Method and circuit for creating an expanded stereo image using phase shifting circuitry
US5892831A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 14, 1997 |
| Grant date | Apr 6, 1999 |
| Priority date | — |
| Expiry date | Feb 14, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S1/002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In portable stereo radio receivers and television receivers, the loudspeakers therein may be separated only by a limited amount. This severely restricts the stereo image created by the loudspeakers. A circuit arrangement for creating an expanded stereo image may be incorporated in such receivers. This circuit arrangement first forms a combined monaural signal and a differential signal from the two stereo signals. The differential signal is then subjected to a phase shift. The phase-shifted differential signal is then matrixed with the combined monaural signal to form output stereo signals. When reproduced through stereo loudspeakers, the stereo image appears to be greatly expanded, beyond the limited placement of the loudspeakers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.