Coin telephone arrangement to obviate acoustically coupled fraud
First Claim
1. In a coin telephone station having voice signal input means, coin deposit input and detection means, and means for translating a coin deposit into encoded information for transmission to a telephone office, the improvement comprising means for obviating acoustical coupling of a fraudulent coin deposit information signal applied through said voice signal input means, said obviating means including means automatically operative during a coin collection interval when said fraudulent signal may be applied through said input means for introducing an error in said fraudulent coin deposit information signal.
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Accused Products
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.
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Citations
11 Claims
- 1. In a coin telephone station having voice signal input means, coin deposit input and detection means, and means for translating a coin deposit into encoded information for transmission to a telephone office, the improvement comprising means for obviating acoustical coupling of a fraudulent coin deposit information signal applied through said voice signal input means, said obviating means including means automatically operative during a coin collection interval when said fraudulent signal may be applied through said input means for introducing an error in said fraudulent coin deposit information signal.
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7. In a coin telephone station of the type wherein said coin station is connectable to a telephone office, and wherein said coin station includes a speech network for transmitting to said telephone office a voice frequency signal applied to said coin station, coin deposit information detection means, and means for transmitting detected coin deposit information to said telephone office, the improvement comprising:
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means automatically operative during a coin collection interval when said telephone station is connected to said telephone office for obviating a coin deposit signal fraudulently applied to said speech network, said obviating means including; means for periodically attenuating said fraudulent coin deposit signal so that an error is inserted in said fraudulent signal, and means for inhibiting said fraudulent signal during transmission of said coin deposit information from said coin station to said telephone office. - View Dependent Claims (8, 9, 10, 11)
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Specification