Frequency-deviation method and apparatus

Details Frequency-deviation method and apparatus Frequency-deviation method and apparatus

1970-10-15

1976-03-09

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

84 125, 325138, 332 31T, 328 16, 328 23, H03C 152

Patent

active

039434656

ABSTRACT:
A carrier wave having a sub-audible frequency is modulated in amplitude by a modulating wave of a tone signal having an audible frequency, which produces a resultant modulated output signal having first and second side band components respectively deviated above and below the tone signal frequency by a deviation amount equal to the carrier frequency. The frequency of the carrier wave is much lower than that of the modulating wave. This frequency deviation technique is utilized to provide a tremolo effect or a chorus effect in an electronic musical instrument, wherein the frequency-deviated signal is admixed with the original non-deviated signal.

REFERENCES:
patent: 2565409 (1951-08-01), Thompson
patent: 2745991 (1966-05-01), Seymour
patent: 3493669 (1970-02-01), Elbrecht et al.
patent: 3510567 (1970-05-01), Fisher
patent: 3553590 (1971-01-01), Hofgen
"Encyclopedic Dictionary of Electronics and Nuclear Engineering" Sarbacher- Prentice Hall Inc., - Cliffs, N.J., 1959, pp. 71, 782, 783, 787.
Weaver - "A Third Method of Generation and Detection of Single-Sideband Signals" Proc. of the IRE pp. 1703-1705 Dec., 1956.

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