Stereophonic sense enhancing apparatus
US4191852A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 16, 1978 |
| Grant date | Mar 4, 1980 |
| Priority date | — |
| Expiry date | May 16, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S1/002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus fo effectively increasing stereophonic sense when the distance between left and right loudspeakers is small is disclosed. This apparatus enlarges the apparent distance between the left and the right sources of sound by vectorially adding the sound signals of the left and the right channels. This apparatus has a phase reversing circuit, a mixer circuit, and a band-pass filter in each of the left and the right channels. The phase reversing circuit is a negative feedback type tone control circuit, the mixer circuit includes a stereophonic sense increasing effect on-off switch device capable of switching load impedances, and the band-pass filter passes a sound frequency band that is useful for increasing the stereophonic sense.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.