Method and apparatus for reproducing sound having an expanded acoustic image
US4497064A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 5, 1982 |
| Grant date | Jan 29, 1985 |
| Priority date | — |
| Expiry date | Aug 5, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S1/002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus for reproducing sound having an expanded acoustic image is used in a stereophonic sound reproduction system having a left channel output and a right channel output, which need not be binaural. A right main speaker and a left main speaker are disposed at right and left main speaker locations, respectively, which are equidistantly spaced from a listening location along a listening axis perpendicular to a line joining the left and right main speakers. The interaural time delay between the ears of a listener at the listening location with respect to the main speakers is .DELTA.t. A first right sub-speaker and a first left sub-speaker are respectively disposed at right and left sub-speaker locations equidistantly spaced from the listening location, and spaced such that sound from the sub-speakers as perceived by the ears of a listener is delayed as compared to sound from the main speakers by .DELTA.t. The left and right channel outputs are coupled to the left and right main speakers, respectively. Inverted left and right channel outputs are coupled to the first right and first left sub-speakers, respectively. Additional sub-speakers can be provided for each channel and fed the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.