Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Particular input circuit
Patent
1994-12-07
1996-05-28
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Particular input circuit
327160, 327171, 327261, 327396, 377 39, H03K 2102, H03K 1728
Patent
active
055219527
ABSTRACT:
A pulse counter circuit has an invertor which inverts a pulse signal input thereto to form an inverted signal. One of the pulse signal and the inverted signal is selected in response to a selecting signal, and the selected signal is delivered as an output signal. Changeover of a signal to be selected between the pulse signal and the inverted signal is effected at timing of a change in level of the pulse signal. A counter counts pulses of the output signal. A pulse signal changeover circuit selects one of a pulse signal and an inverted signal obtained by inverting the pulse signal, in response to a selecting signal, and the selected signal is delivered as an output signal. The pulse signal is masked by being held at a predetermined level within a predetermined time period, and the inverted signal is masked by being held at the predetermined level within the predetermined time period. Changeover of a signal to be selected between the pulse signal and the inverted signal is effected within the predetermined time period.
REFERENCES:
patent: 4979194 (1990-12-01), Kawano
patent: 5045800 (1991-09-01), Kung
patent: 5047659 (1991-09-01), Ullrich
patent: 5084907 (1992-01-01), Maemura
patent: 5371770 (1994-12-01), Sakuma
Heyman John S.
Yamaha Corporation
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