Circuit arrangement for detecting and interpreting interferences

Details Circuit arrangement for detecting and interpreting interferences Circuit arrangement for detecting and interpreting interferences

1981-10-13

1984-01-31

Schreyer, Stafford D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

1791752C, 307273, 221 21, H04M 1702

Patent

active

044291833

ABSTRACT:
The present invention comprehends a circuit arrangement for detecting and interpreting interferences with automatic machines and particularly coin telephones. Free use of the automatic machine by manipulations (statically charged persons, electronic cigarette lighters or gas lighters) is prevented by means of a highly sensitive interference discriminator whose input is connected to the housing of the automatic machine or to an antenna, and whose output controls the malfunction detector in such a way that the latter blocks the use of the automatic machine when the discriminator responds.

REFERENCES:
patent: 3795343 (1974-03-01), Shigemori et al.

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