Apparatus and method for tamper resistant channel attenuation in

Details Apparatus and method for tamper resistant channel attenuation in Apparatus and method for tamper resistant channel attenuation in

1979-05-25

1981-08-25

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358115, H04N 716

Patent

active

042862884

ABSTRACT:
A tamper resistant subscription television converter is made by connecting a bandstop filter in the Radio Frequency circuit of the converter. The filter, for attenuating one or more preselected subscription television channels is connected in series at a location in the Radio Frequency circuit such that tampering with it would affect the converter's alignment. The filter is tuned to obtain maximum attenuation of the preselected channels and the converter is aligned for proper reception of the remaining channels. Any attempt to disable the attenuator results in unacceptable reception of all channels. A preferred bandstop filter is a constant K, T section L-C filter.

REFERENCES:
patent: 3859457 (1975-01-01), Kirk, Jr.
patent: 3989887 (1976-11-01), Murphy
patent: 4085422 (1978-04-01), Niwata et al.
patent: 4097894 (1978-06-01), Tanner et al.
patent: 4099203 (1978-07-01), Garodnick

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