Stereophonic sound synthesizer
US4239939A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 9, 1979 |
| Grant date | Dec 16, 1980 |
| Priority date | — |
| Expiry date | Mar 9, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S5/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system is provided which synthesizes stereophonic sound by developing two separate sound channels from a single monophonic sound source. A synthetic stereophonic sound system constructed in accordance with the principles of this invention may be advantageously utilized in combination with a visual display such as a television receiver. A monaural signal is applied as the input signal for a transfer function circuit of the form H(s), which modulates the intensity of the monaural signal as a function of frequency. The intensity modulated H(s) signal is coupled to a reproducing loudspeaker, and comprises one channel of the synthetic stero system. The H(s) signal is also coupled to one input of a differential amplifier. The monaural signal is coupled to the other input of the differential amplifier to produce a difference signal which is the complement of the H(s) signal. The difference signal is coupled to a second reproducing loudspeaker, which comprises the second channel of the synthetic stereo system. In accordance with a preferred embodiment of the present invention, a stereo synthesizer is utilized as the sound reproducing system of a television receiver, with the reproducing …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.