1975-05-19
1976-12-14
Claffy, Kathleen H.
179 64, H04M 1702
Patent
active
039977269
ABSTRACT:
Coin telephone set comprising a telephone station adapted to be connected to two wires of a telephone line from a telephone exchange, a call charge signal detecting circuit connected in parallel to the telephone station, an assembly of control and monitoring switching means operable by coins, respectively, logic circuits for processing the output signal from said call charge signal detecting and the output signals from the assembly of control and monitoring switching means, and a computing unit interconnected with the logic circuits for keeping up to date the account of the user of the telephone set from the moment the latter is connected to the desired telephone subscriber. The computing unit comprises a series of D-type flip-flops having each a clock input, a signal input, a resetting input, a setting input and an output, and a series of elementary adders equal in number to aid D-type flip-flops. Each adder is associated with a respective one of the D-type flip-flop having the same order number in the series, and has a first input connected to the output of the associated D-type flip-flop of the series, a second input for receiving from the logic circuits a respective one of the bits of a code q of an information p (p being a positive, negative or zero integer representing an amount of money to be carried to the credit or debit of the user's account). The respective one bit has a weight i (i = 1, 2. ... n+1) equal to the order number of the considered elementary adder, and said code q is defined as follows:
REFERENCES:
patent: 3221101 (1965-11-01), Clark, Jr.
patent: 3579253 (1971-05-01), Edington et al.
patent: 3814907 (1974-06-01), Edington et al.
patent: 3881062 (1975-04-01), Beeman
Brigance Gerald L.
Claffy Kathleen H.
Societe Anonyme Francaise des Appareils Automatiques, Taximetere
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