Frequency sensing and control circuit

Details Frequency sensing and control circuit Frequency sensing and control circuit

1988-03-02

1989-07-11

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Having phase shift

377 45, 377 26, 328133, G01R 2508, H03L 718

Patent

active

048478792

ABSTRACT:
In construction of a digital phase locked loop for detection of the angular displacement of a mobile object depending on input signals from an encoder, is provided a bit number control circuit so that working bit numbers of A/D converters and a counter in the loop are automatically reduced as the frequency of the input signals rise and, in accordance with such reduction in working bit number, a function generating ROM of a smaller bit number is selected from a group of function generating ROMs of different bit numbers for supply of address data to multipliers connected to the A/D converters, thereby the signal processing speed of the loop is significantly raised to face up to current speed-up in the mobile object displacement.

REFERENCES:
patent: 3989931 (1976-11-01), Phillips
patent: 4247898 (1981-01-01), Bosselaers
patent: 4583856 (1986-04-01), Moore
patent: 4700367 (1987-10-01), Kawazoe et al.
patent: 4763342 (1988-08-01), Ambrosio et al.

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