Coin fraud prevention system for coin telephones

Details Coin fraud prevention system for coin telephones Coin fraud prevention system for coin telephones

1991-05-28

1992-09-22

Schreyer, Stafford D.

Telephonic communications

With check operated control

Fraud or interference prevention

379146, 379155, H04M 166, H04M 1702

Patent

active

051504030

ABSTRACT:
A coin fraud prevention system which includes a coin telephone having a voice transmitter, comprising a coin tone sensing arrangement for sensing coin tones, coupled to the voice transmitter of the telephone; and a coin telephone disabling arrangement in the coin telephone coupled to an output of the coin tone sensing arrangement for disabling the coin telephone in response to sensing of the coin tones from the transmitter; wherein further the coin tones include at least one or two coin tone frequencies, and the system has a bandpass filter having at least one pass band corresponding to the tone frequencies, and a tone detector coupled to the bandpass filter for generating a coin telephone disabling signal in response to receipt of the tone frequencies, wherein the disabling signal is connected to the coin telephone disabling arrangement, so as to prevent dialing of the call.

REFERENCES:
patent: 4674114 (1987-06-01), Crouch et al.
patent: 5022073 (1991-06-01), Jordan

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