Sound reproducing apparatus

Details Sound reproducing apparatus Sound reproducing apparatus

1989-11-02

1991-08-13

Isen, Forester W.

Electrical audio signal processing systems and devices

Sound effects

381 63, H03G 300

Patent

active

050402196

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.

REFERENCES:
patent: 4649564 (1987-03-01), Barnett
patent: 4694497 (1987-09-01), Kasai et al.
patent: 4706291 (1987-11-01), Kakubo et al.
J. Acoust. Soc. Am, vol. 62; No. 6, Dec., 1977 (pp. 1436-1441).

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