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Browse Prior Art Database

Sixty Hertz Regulated Clock

IP.com Disclosure Number: IPCOM000080804D
Original Publication Date: 1974-Feb-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Johnson, CF: AUTHOR [+2]

Abstract

A relatively precise train of clock pulses 10 is generated from a relatively imprecise multivibrator 11, whose output is regulated by the precision of a 60 Hertz power line 12. Pulses of clock train 10 are generated by the application of alternate set and reset signals to latch 13 by decode and control logic 14. Logic 14 alternately produces output set and reset signals upon the attainment of a selectable count by multivibrator pulse counter 15. The specific count to be attained is determined by logic 14, from a prewired logic table that is enabled by the output of a pulse time measurement counter 16.

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Sixty Hertz Regulated Clock

A relatively precise train of clock pulses 10 is generated from a relatively imprecise multivibrator 11, whose output is regulated by the precision of a 60 Hertz power line 12. Pulses of clock train 10 are generated by the application of alternate set and reset signals to latch 13 by decode and control logic 14. Logic 14 alternately produces output set and reset signals upon the attainment of a selectable count by multivibrator pulse counter 15. The specific count to be attained is determined by logic 14, from a prewired logic table that is enabled by the output of a pulse time measurement counter 16.

Input to counter 16 is controlled by AND gate 17 connected to receive pulses from multivibrator 11 and a threshold detector 18, which supplies it a signal that changes state once each 60 Hertz cycle. AND gate 17 thus enables the passage of a time measured number of pulses from multivibrator 11 during the relatively precise 60 Hertz period. The number of pulses counted during the 60 Hertz period by counter 16 is a measure of the actual frequency output of the multivibrator 11. The count of counter 16 is thereby effective to control logic 14 to select a desired number of the pulses from multivibrator 11, as necessary, to produce an output clock signal 10 of 25 Kilohertz.

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