Electrical pulse counters – pulse dividers – or shift registers: c – Counting or dividing in incremental steps – Beam type tube
Patent
1987-04-17
1988-10-11
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Counting or dividing in incremental steps
Beam type tube
328112, 328140, 377 47, 307522, 307234, H03K 526, H03L 724
Patent
active
047774487
ABSTRACT:
A frequency multiplying circuit for a disc controller includes a first time counting unit responsive to input pulse signals for producing a first detection signal when a HIGH level of the input pulse signals is longer than a predetermined length, a second time counting unit responsive to the input pulse signals for producing a second detection signal when a LOW level of the input pulse signals is longer than a predetermined length, and a gate timing determination unit responsive to the produced first and second detection signals for providing a gate signal in response to the first detection signal and for providing another gate signal in response to the second detection signal. First and second pulses are generated responsive to the gate signals and to rising or falling edges of the input signals for providing a frequency multiplied output of the input pulse signals. Frequency multiplication of the input pulse signals is thereby prohibited when the frequency of the input pulse signals is higher than a predetermined frequency.
REFERENCES:
patent: 3555434 (1971-01-01), Sheen
patent: 3980960 (1976-09-01), Hutchinson
patent: 4004234 (1977-01-01), Cardon et al.
patent: 4344038 (1982-08-01), Streeter
patent: 4360782 (1982-11-01), Nowell
Fujitsu Limited
Heyman John S.
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