Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Counter controlled counter
Patent
1983-09-12
1986-02-25
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Counter controlled counter
377 50, 377 43, 307271, H03B 372
Patent
active
045731756
ABSTRACT:
Characteristics of a pulse sequence, such as frequency, are controlled in a simple circuit without requirement for specific storage components. The cumulative effect of a sequence of control signals is maintained by providing a phase shift between a pair of waveforms. The phase shift between the waveforms is used to provide a number of control pulses to the circuit for varying the desired characteristic. In a particular embodiment, control signals are externally provided for varying the phase shift between two waveforms. In response to the phase variation, a number of control signals are provided for adding or deleting pulses to a pulse stream. The use of feedback control loops results in repeated addition and/or deletion of pulses to or from the pulse stream, thereby varying the output frequency in accordance with a one time input of the external control signals. In accordance with the principles of the invention, serial or parallel control signals may be provided, and ripple counters (or a combination of ripple and presettable counters) may be used for the frequency control function.
REFERENCES:
patent: 3096483 (1963-07-01), Ransom
patent: 3651414 (1972-03-01), Jamieson
patent: 3845281 (1974-10-01), Kunisi et al.
patent: 3976945 (1976-08-01), Cox
patent: 4007408 (1977-02-01), Berney
patent: 4101838 (1978-07-01), Aihara et al.
patent: 4360788 (1982-11-01), Erps et al.
Cressey John R.
Miller Stephen A.
Case Communications Inc.
Heyman John S.
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