Frequency discrimination circuit

Details Frequency discrimination circuit Frequency discrimination circuit

1980-12-29

1982-12-28

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328140, 328151, 328185, 307352, 307522, 318318, H03K 519, H03K 600, G11C 2702

Patent

active

043663990

ABSTRACT:
A frequency discrimination circuit suitable for use in a speed control device is disclosed which comprises a single retriggerable monostable multivibrator for discriminating a period of an input pulse signal corresponding to a speed from a predetermined period, a gate for inhibiting the output of the multivibrator at least for a sampling period, and a trapezoidal wave generator for generating a trapezoidal wave when the output of the gate is absent, and a sample-and-hold circuit for sampling the trapezoidal wave by a sampling pulse synchronized with the input pulse signal and for holding a sampled value to generate a frequency discrimination output on the output side of the circuit. The provision of the retriggerable monostable multivibrator reduces undesirable variations the circuit operation due to the change in the ambient temperature, and prevents the generation of a false lock-in point.

REFERENCES:
patent: 3778638 (1973-12-01), Garratt
patent: 3867647 (1975-02-01), Callahan et al.
patent: 4085373 (1978-04-01), McConnell

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