Back-masking effect generator

Details Back-masking effect generator Back-masking effect generator

1992-05-28

1993-09-14

Ng, Jin F.

Electrical audio signal processing systems and devices

Sound effects

381 63, 84603, H03G 300

Patent

active

052456633

ABSTRACT:
The invention comprises a back-masking effect generator which produces, almost in real time, the simulated sound of an input audio signal being reproduced in reverse. The device digitally records the sound in packets of short duration with alternating packets being written to first and second static random access memory devices, respectively. After an initial state in which the first memory device is filled with the digitized input audio signal, the generator then continuously alternates between two other states. In one state, the second memory device is filled while the first memory device is simultaneously emptied to a digital-to-analog converter in the reverse order from which it was filled. In the other state, the first static random access memory is filled while the second memory device is simultaneously emptied to the digital-to-analog converter.

REFERENCES:
patent: 4947723 (1990-08-01), Kawashima et al.
patent: 5090291 (1992-02-01), Schwartz

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