Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1978-03-31
1980-03-11
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328 61, 328154, 307243, 84 101, 84 103, 84 117, G10H 100, H03K 1924
Patent
active
041930380
ABSTRACT:
A key input apparatus is provided with a plurality of input operation keys and a time signal generating circuit which in correspondence to the number of these input keys performs a step operation to generate in turn a different timing signal. Input signals produced by actuation of the input operation keys pass through a group of first AND gates in synchronism with the corresponding timing signals generated from the timing signal generating circuit. A shift register having bits corresponding in number to the gates of the group of first AND gates receives the output signal of the AND gates via an OR gate. The output signal from the OR gate is applied to one input terminal of a second AND gate of which the other input terminal is coupled with the last bit position of the shift register through an inverter. The outputting operation of the second AND gate is controlled by the shift register and inverter. The respective signals due to the actuation of the input keys are produced in synchronism with the corresponding timing signals from the timing signal generating circuit.
REFERENCES:
patent: 3657658 (1972-04-01), Kubo
patent: 3803497 (1974-04-01), Tyau
patent: 3991645 (1976-11-01), Luce et al.
patent: 4007358 (1977-02-01), Iguchi et al.
patent: 4108036 (1978-08-01), Slaymaker
Casio Computer Co. Ltd.
Heyman John S.
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