Saw television scrambling system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 27, 2000
Grant Date -
N/A
app pub date -
Dec 1, 1997
filing date -
Dec 1, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A television scrambling system in which a television signal is scrambled by means of placing a scrambling (or jamming) signal into the luminance signal spectrum on the transmit side. On the receive side, the jamming signal is removed by a Surface Acoustic Wave (SAW) notch filter. On the transmit side, pre-correction of the television signal is performed to compensate for amplitude and phase distortions introduced by the SAW notch filter. The pre-correction includes: inverting the television signal as a function of time; pre-distorting the phase of the time-inverted television signal in accordance with the phase response of the SAW notch filter; pre-emphasizing the time-inverted television signal using a first amplitude corrector having a phase response; restoring the television signal to a time uninverted state, such that the phase of the restored television signal is pre-distorted in accordance with the inverse of the SAW notch filter phase response; and pre-emphasizing the restored television signal using a second amplitude corrector having a phase response which is substantially equivalent to the phase response of the first amplitude corrector.
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