Electrical audio signal processing systems and devices – Sound effects
Patent
1993-09-13
1996-04-16
Kuntz, Curtis
Electrical audio signal processing systems and devices
Sound effects
84606, 84602, H03G 300
Patent
active
055090796
ABSTRACT:
The present invention is an audio special effect generator which simulates, almost in real time, the sound of an input audio signal being played in reverse. An input audio signal is digitized and read into memory locations in an SRAM which are sequentially addressed from zero until a predetermined address is reached at which point the data stored is read out to an output terminal in reverse order, i.e., the SRAM is addressed from the predetermined address back to zero. For each read, the data read out of the SRAM is replaced with new data from the input audio signal. When the address reaches zero again, the address begins to be incremented again as the data in each location continues to be read out to the output terminal while being replaced by data from the audio input signal. This operation continues until disabled, thus producing an audio output which is a series of audio signal packets which are copies of portions of the input audio signal reproduced in reverse.
REFERENCES:
patent: 4259888 (1981-04-01), Gross
patent: 4442745 (1984-04-01), Gross et al.
patent: 4655112 (1987-04-01), Mitarai
patent: 4947723 (1990-08-01), Kawashima et al.
patent: 5090291 (1992-02-01), Schwartz
patent: 5350882 (1994-12-01), Koguchi et al.
Kuntz Curtis
Lee Ping W.
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