Frequency controlled recursive oscillator having sinusoidal outp

Details Frequency controlled recursive oscillator having sinusoidal outp Frequency controlled recursive oscillator having sinusoidal outp

1992-09-02

1993-04-20

Grimm, Siegfried H.

Oscillators

Phase shift type

331177R, 331179, 332100, 375 65, H03B 502, H04L 2712

Patent

active

052046427

ABSTRACT:
An apparatus is disclosed for generating an output signal in response to an input signal having a variable input level. The output signal has an output frequency which varies to represent variations in the input level. The apparatus comprises a processing circuit for implementing a digital signal processing algorithm to generate control signals in response to the input signal, which control signals are representative of the variable input level, and an oscillator circuit for generating the output signal in response to the control signals. The control signals include a first control signal representing a first output frequency, a second control signal representing a second output frequency, and at least one intermediate control signal representing output frequencies intermediate the first and second output frequencies. The processing circuit generates at least one intermediate control signal whenever the output signal varies between the first and the second output frequencies which serves to "soften" the transition between the first and second output frequencies and reduces noise which usually is generated by such sudden changes in output frequency.

REFERENCES:
patent: 4573025 (1986-02-01), McKinzie
patent: 4686489 (1987-08-01), Caspell
patent: 5105444 (1992-04-01), Gard

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