Sound reproducing apparatus
US5040219A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1989 |
| Grant date | Aug 13, 1991 |
| Priority date | — |
| Expiry date | Nov 2, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S1/005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A sound reproducing apparatus is capable of reproducing a stereo or a voice signal and adding thereto effect sounds, such as an initial reflected sound, and reechoed sound during the reproducing. Each of the effect sounds is added with a delay time depending on a change of the sound source signal. To obtain the delay time, the sound source signal is converted into a three-value signal, and then the time in which the auto-correlation of the three-value signal decreases to a predetermined value is determined. Thus the effect sounds can be added automatically with a desired delay time due to the sound source signal. Therefore manual adjustments are unnecessary, and the circuit structures of the entire apparatus can be simplified.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.