Wide dynamic range voltage controlled filter for electronic musi

Details Wide dynamic range voltage controlled filter for electronic musi Wide dynamic range voltage controlled filter for electronic musi

1974-06-14

1976-08-10

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

84 111, 84 119, 84DIG9, 333 17R, 333 70CR, G10H 104, H03H 710

Patent

active

039744612

ABSTRACT:
A voltage controlled filter for an electronic synthesizer incorporates a plurality of individual voltage controlled filter stages connected in cascade with a variable feedback interconnecting the input and output stages. Each of the stages is controlled by application of a series of pulses, with the period between successive pulses determining the cutoff frequency of the filter. Application of pulses to the filter stages at different pulse repetition rates changes the cutoff frequency of the filter and modifies the relative amplitudes of different frequency components of an audio signal to be passed by the filter. The filter is suited for use with high level signals and provides an extremely wide dynamic range through a very high signal-to-noise ratio.

REFERENCES:
patent: 2486843 (1949-11-01), Hepp
patent: 2679581 (1954-05-01), Jacob et al.
patent: 3835399 (1974-09-01), Holmes
patent: 3890570 (1975-06-01), Kristensen et al.

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