Frequency measuring system employing an auto-correlation functio

Details Frequency measuring system employing an auto-correlation functio Frequency measuring system employing an auto-correlation functio

1977-07-07

1978-09-26

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

324 83FE, 331 17, 331 23, 331 27, H03B 304

Patent

active

041174194

ABSTRACT:
In the frequency measuring system disclosed herein, a control signal is generated which is related to the value of function of the input signal for a selectable delay time. The average value of the control signal is employed to control the clock rate of a shift register which is used to obtain a delayed version of the input signal, the input signal being digitized and fed into the shift register. This feedback path forms a servo-loop which adjusts the clocking rate of the shift register in correspondence with the frequency of any coherent component in the input signal, even though the input signal may be a composite comprising many random components.

REFERENCES:
patent: 3351868 (1967-11-01), Farrow
patent: 3819919 (1974-06-01), McGunigle
patent: 4055814 (1977-10-01), Abraham et al.
Ludington, "Digital Circuit Detects Frequency-Modulated Signals", Electronic Design, Apr. 12, 1976, p. 126.

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