Escrow telephone coin collection circuit and method

Details Escrow telephone coin collection circuit and method Escrow telephone coin collection circuit and method

1976-05-17

1977-06-07

Claffy, Kathleen H.

179 631, H04M 1700

Patent

active

040284948

ABSTRACT:
The speech path in an escrow coin telephone system wherein coins may be deposited throughout the talking state is maintained free of potentially disruptive coin collection signals. After the serving switching office has calculated the rate for the particular call but prior to called party answer, it transmits a series of rate metering impulses to the station set. A pulse generator at the station set is then preset at a frequency corresponding to the calculated rate and allows the credit balance to be reduced after each unit interval. Logic is provided to collect the coin of highest denomination while the cell is in progress and to ensure a fair coin refund after hangup so that large denomination coins are not collected when smaller ones are available.

REFERENCES:
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patent: 3870866 (1975-03-01), Halpern
patent: 3890468 (1975-06-01), Burns et al.
Electrical Communication, vol. 48, No. 3, 1973, "Coin Operated Telephones," G. Zeidler, pp. 260-268.
Proceedings of the 5th International Symposium on Human Factors in Telecommunications, Sept. 1970, London 21-25, Paper 4.3, H. Oden & K. Kuhnle.
National Telecommunications Conference, vol. 1, 1973, "Conference Record," A. Zaky, pp. 10D-1 to 10D-3.

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