Processor for use between keyboard telephone set and television

Details Processor for use between keyboard telephone set and television Processor for use between keyboard telephone set and television

1975-01-21

1976-10-05

Claffy, Kathleen H.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

179 2TV, 340324AD, H04M 1106

Patent

active

039846385

ABSTRACT:
Processor for use between an earpiece of a keyboard telephone set serving to interrogate a computer by means of multi-frequency code interrogation signals and to receive from said computer digital serial answer words beginning with a start signal and frequency modulating an answer carrier, and a television set for displaying alpha-numeric characters corresponding to these digital answer words. The conventional telephone sets include means for inhibiting the answer signals from being applied to the earpiece when a key of the keyboard is depressed. Also when a key of the telephone set is depressed on overvoltage is produced across the earpiece terminals which would give rise to false start signals if no precaution was taken. Accordingly, the processor comprises a frequency demodulator for receiving the frequency modulated signals corresponding to values zero and one of the bits of the answer words, a receive register controlled by the start signals and means for allowing the frequency demodulator to generate a zero output signal when the frequency of the frequency modulated carrier has the value corresponding to a selected binary value, one or zero, of the bits of the answer words so that, when a key of the keyboard of the telephone set is depressed and the answer frequency modulated carrier is then inhibited, the output signal from the demodulator is the same as when a modulation frequency corresponding to said selected value is received.

REFERENCES:
patent: 3345458 (1967-10-01), Cole
patent: 3641555 (1972-02-01), Griffin
patent: 3647973 (1972-03-01), James
patent: 3675513 (1972-07-01), Flanagan
patent: 3685039 (1972-08-01), Flanagan
patent: 3746793 (1973-07-01), Sachs
patent: 3822363 (1974-07-01), Moyer

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