Coin telephone arrangement to obviate acoustically coupled fraud

Details Coin telephone arrangement to obviate acoustically coupled fraud Coin telephone arrangement to obviate acoustically coupled fraud

1974-11-14

1976-04-20

Olms, Douglas W.

179 631, H04M 1518

Patent

active

039521605

ABSTRACT:
Apparatus for transferring coin deposit information from a coin telephone station to a telephone office, for example, a TSPS, is highly susceptible to acoustically coupled fraud. Acoustically coupled fraud is substantially obviated by an arrangement which intentionally interrupts the transmission facility periodically, thereby forcing errors in any acoustically coupled signals and causing their rejection at the telephone office. In addition, acoustically coupled fraud is obviated during transmission of coin deposit data to the office by disconnecting the coin station speech network from the transmission line during this time.

REFERENCES:
patent: 3453389 (1969-07-01), Shaer
patent: 3466601 (1969-09-01), Tong
patent: 3546395 (1970-12-01), Schuh
patent: 3814907 (1974-06-01), Edington et al.
"Is Automatic Long Distance . . . ", Telephony by Amin Zaky, Jan. 21, 1974, pp. 75-80.
"Automatization of Coin Toll Calls . . . ", National Telecommunications Conf., Nov. 26-28, 1973, pp. 10D-1 to 10D-4.
W. W. Peterson et al., Error-Correcting Codes, 2nd Ed., Mit Press, Chap. 8, pp. 206-268, 1972.

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