Interdiction method and apparatus with direct memory control of

Details Interdiction method and apparatus with direct memory control of Interdiction method and apparatus with direct memory control of

1993-09-02

1994-11-01

Swann, Tod

Cryptography

Cryptanalysis

380 6, 348 55, H04N 7167

Patent

active

053613015

ABSTRACT:
An off-premises method and apparatus for the interdiction of unauthorized channels of a broadband cable television signal includes common circuitry for adjusting the amplitude and equalization levels of the broadband CATV signals and one or more subscriber modules for generating jamming signals of different frequencies which are used to interdict one or more unauthorized channels. Each subscriber module is associated with a subscriber and is programmable and addressable to adjust the jamming parameters of that subscriber independently of other subscribers. Each subscriber module circuit comprises a plurality of latches, each of which is associated with one of a plurality of digital to analog converters. Each of the digital to analog converters drives one or more frequency agile oscillators with its analog output to generate the jamming signals. The subscriber module is based on a sequential state machine which loads frequency control words corresponding to the jammed channels from a frequency control memory into each latch on a cyclic basis. In this manner, the jamming signals generated by each latch, digital to analog converter, and oscillator combination can be varied easily and quickly by a memory to memory transfer and be sustained between frequency hops without any change in frequency. The circuitry lends itself easily to large scale integration and miniaturization while eliminating the need to refresh the circuit to prevent frequency change because of voltage droop.

REFERENCES:
patent: 3760097 (1973-09-01), Buroughs et al.
patent: 3896262 (1975-07-01), Hudspeth et al.
patent: 3899633 (1975-08-01), Sorenson et al.
patent: 3989887 (1976-11-01), Murphy
patent: 4039954 (1977-08-01), den Toonder
patent: 4091413 (1978-05-01), Herman
patent: 4148064 (1979-04-01), Reed
patent: 4334322 (1982-06-01), Clark, III
patent: 4342119 (1982-07-01), Seidl
patent: 4343042 (1982-08-01), Schrock et al.
patent: 4367557 (1983-01-01), Stern et al.
patent: 4434436 (1984-02-01), Kleykamp et al.
patent: 4450481 (1984-05-01), Dickinson
patent: 4498193 (1985-02-01), Richardson
patent: 4521809 (1985-06-01), Bingham et al.
patent: 4651204 (1987-03-01), Uemura
patent: 4737990 (1988-04-01), Kaneko
patent: 4769838 (1988-09-01), Hasegawa
patent: 4792971 (1988-12-01), Uemura
patent: 4825468 (1989-04-01), Ellis
patent: 4837820 (1989-06-01), Bellavia, Jr.
patent: 4841569 (1989-06-01), Wachob
patent: 4903297 (1990-02-01), Rist et al.
patent: 4912760 (1990-03-01), West, Jr. et al.
patent: 4914695 (1990-04-01), Martin
patent: 4963966 (1990-10-01), Harney et al.
patent: 5014309 (1991-05-01), West, Jr.
patent: 5068893 (1991-11-01), West et al.
patent: 5109286 (1992-04-01), West, Jr. et al.
patent: 5140633 (1992-08-01), Gurusami et al.
patent: 5142574 (1992-08-01), West, Jr. et al.
patent: 5233652 (1993-08-01), Huang et al.
patent: 5265160 (1993-11-01), Harney et al.
patent: 5278908 (1994-01-01), Parikh et al.
"Addressable Tap IT-1-SM" by Control Com, Inc.
"Tier Guard System" by E-Com Corporation.

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