Music – Instruments
Patent
1974-09-20
1977-01-04
Witkowski, Stanley J.
Music
Instruments
84DIG26, 179 1J, 332 16R, 332 22, 333 29, G10H 104, H03H 730
Patent
active
040006760
ABSTRACT:
A method and means for modulating the frequency of an analog signal to achieve a vibrato effect wherein the analog signal is transmitted through an analog shift register or delay line under the control of a digital clock signal and wherein the frequency of the digital clock signal is varied at a rate equal to the desired rate of modulation of the analog signal. In this manner, the output of the shift register is a delayed version of the input thereto, with the frequency modulated at the same rate that the clock signal frequency is modulated. According to the preferred embodiment of the invention, first and second shift registers are utilized and the analog signal is divided into upper and lower frequency bands which are separately applied to the two shift registers. Furthermore the shift register which receives the lower frequency band is clocked at one-half the rate of the shift register which receives the higher frequency band.
REFERENCES:
patent: 3609205 (1971-09-01), Schwartz et al.
patent: 3626078 (1971-12-01), Sekiguchi
patent: 3644657 (1972-02-01), Miller
patent: 3681531 (1972-08-01), Burkhard et al.
patent: 3749837 (1973-07-01), Doughty
patent: 3833752 (1974-09-01), Van Der Kooij
patent: 3842204 (1974-10-01), Leslie
patent: 3895553 (1975-07-01), Kawamoto
patent: 3920905 (1975-11-01), Sharp
Hinderstein Philip M.
Witkowski Stanley J.
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