Arcom Digital, LLC

Tresness Irrevocable Patent Trust

Telecom

Victor M Zinevitch

A system for pinpointing CDP sources in a two-way HFC CATV network comprises a headend CPD radar unit, a return path switch, and a computer. The radar unit is coupled to a headend combiner. The return path switch is coupled between the nodes of the CATV network and the radar unit. The computer is connected to the radar unit and the return path switch. The computer controls the radar unit and switch and causes them to perform constant sequential CPD monitoring of the nodes of the network. The system further comprises a portable radar-calibrator unit that is carried into the field and connected to various points along the coaxial cable portion of the network. The portable radar unit is used to detect CPD sources in the field and to calibrate the network as to time delay. The portable unit communicates with the headend radar unit through the CATV network.

Method and apparatus for pinpointing common path distortion

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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Voronezh, Russia

Victor M Zinevitch