1976-09-21
1978-05-02
Claffy, Kathleen H.
179 16H, 179 37, H04M 172
Patent
active
040876497
ABSTRACT:
A counting circuit is disclosed which generates an electrical representation corresponding to the number of pulses in a plurality of pulse trains, each pulse train containing at most ten pulses. The circuit does not start to count the number of pulses in individual pulse trains until a first pulse train with more than a preselected number of pulses is received. The circuit then counts each pulse in subsequently received pulse trains for a preselected number of pulse trains. The circuit is particularly useful in key telephone dial pulse signalling apparatus as a register circuit which is not responsive to false pulses generated by lifting the handset.
REFERENCES:
patent: 1530968 (1925-03-01), Williams, Jr.
patent: 3243515 (1966-03-01), Abbott
patent: 3670110 (1972-06-01), Warner
patent: 3885109 (1975-05-01), Sudoh et al.
patent: 4009354 (1977-02-01), Champan
Hamatani Fumikazu
Kerman Stephen E.
Tsutsumi Fumio
Claffy Kathleen H.
Myers Randall P.
Nippon Tsu Shin Kogyo K.K.
TIE Communications, Inc.
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