Method and apparatus for producing two complementary pitch signa

Details Method and apparatus for producing two complementary pitch signa Method and apparatus for producing two complementary pitch signa

1981-01-21

1983-01-18

Kemeny, Emanuel S.

84 124, 179 1555T, H04B 166

Patent

active

043693369

ABSTRACT:
Chorus effect for an original audio signal is developed by forming a complementary pair of signals from the original. The original signal is stored at a write rate (f.sub.c), then, after a delay, strobed to a pair of FIFO registers, one strobe at a higher rate (f.sub.c +.DELTA.f), the other strobe at a lower rate (f.sub.c -.DELTA.f), respectively. The faster readout will decrease the delay (to zero, causing foldover glitch), the slower readout will increase the delay (to excess delay, causing discrete echo). The strobe frequencies are reversed between FIFO registers whenever the delay becomes too great or too small.

REFERENCES:
patent: 3749837 (1973-07-01), Doughty
patent: 3816664 (1974-06-01), Koch
patent: 4121058 (1978-10-01), Jusko et al.
patent: 4186643 (1980-02-01), Nishibe et al.

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