Pre-emphasis network with variable time delay

Details Pre-emphasis network with variable time delay Pre-emphasis network with variable time delay

1996-07-17

1998-03-10

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330306, H03F 3191

Patent

active

057266069

ABSTRACT:
A pre-emphasis network used in a television signal jamming encoder has a variable gain tuned amplifier first stage and an attenuable notch filter and variable gain broadband amplifier second stage. The notch filter is tuned to a center frequency above the television signal intermediate frequency's visual carrier frequency resulting in 15 dB of increased pre-emphasis and a time delay which compensates for a time delay imparted by a decoding network upon decoding of a signal jammed by this encoder.

REFERENCES:
patent: 4074311 (1978-02-01), Tanner et al.
patent: 4371846 (1983-02-01), Gamble
patent: 4464636 (1984-08-01), Dobrovolny
patent: 5124668 (1992-06-01), Christian

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