FM modulator for an input impulse signal

Details FM modulator for an input impulse signal FM modulator for an input impulse signal

1987-10-22

1991-03-26

Laroche, Eugene R.

Boots, shoes, and leggings

364721, 36472417, 328 14, G06F 102

Patent

active

050035045

ABSTRACT:
An FM modulator comprises a first adder for adding an impulse input signal and a feedback signal to produce an added signal, a delay device for receiving and delaying the added signal to produce first and second delayed signals, a multiplying coefficient generator for producing multiplying coefficients, multiplier for multiplying the delayed signals by multiplying coefficients to produce first and second multiplied signals, and a second adder for adding the multiplied signals to produce the feedback signal. The added signal is a frequency modulation signal which may be further delayed and multiplied by multiplying coefficients. At lease one of the multiplying coefficients varies in its value as a function of time so that the frequency modulation signal is produced.

REFERENCES:
patent: 4249447 (1981-02-01), Tomisawa
patent: 4422156 (1983-12-01), Sano
patent: 4472993 (1984-09-01), Futamase et al.
patent: 4580237 (1986-04-01), Eggermont
patent: 4679480 (1987-07-01), Suzuki
Alles, Harold G., "Music Synthesis Using Real Time Digital Techniques", Proc of the IEEE, vol. 68, No. 4, Apr. 1980, pp. 436-449, Copy in 364/721.

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