Multifrequency sender/receiver in a multi-time slot digital data

Details Multifrequency sender/receiver in a multi-time slot digital data Multifrequency sender/receiver in a multi-time slot digital data

1977-01-26

1979-01-09

Stewart, David L.

179 84UF, H04J 312

Patent

active

041339797

ABSTRACT:
A multifrequency sender/receiver in a telephone system operating in time frames each including a plurality of time slots, including a sender for generating and connecting selected multifrequency tone signals in pulse code modulated format to a first group of the time slots. The receiver is responsive to the presence of a multifrequency tone in a second group of the time slots and provides a data signal representative of the tone signal present. Control means specify the selected tone signals to be sent in the first group of time slots.

REFERENCES:
patent: 3801746 (1974-04-01), Buchner
patent: 3870826 (1975-03-01), Carbrey
patent: 3936611 (1976-02-01), Poole
patent: 3959596 (1976-05-01), Botanek
patent: 3961167 (1976-06-01), Mills
patent: 3985965 (1976-10-01), Field

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