Cable Tv

Cable TV Scrambling Methods

There are 4 study methods of pay- comport security and to each one has different consequences for cable ready receivers. The 4 Cable TV Scrambling Methods are crowd, trapping, out-of-band scrambling and in-band scrambling.
Jamming:
A jamming prefigure is placed between the picture flattop and and the aural carrier of the secured channels. The cable operator supplies a filter for each customer for each paid channel. This type of security is tardily defeated by homemade notch filters.
Trapping:
In these systems frequency filters are installed in line with the cable drops on telephone poles. The traps are removed for customers paying for the premium channels. Cable-ready TVs work fine in these systems.
Scrambling:
The gated Sync Methods:
Scrambling in the cable TV business still generally inwardness pulsed sync suppression. In its simplest form, amplitude of the picture carrier is decrease by 6 db during the horizontal blanking intervals and sometimes during the just blanking intervals. The resulting video signal has sync tips between the black and albumin levels. Sync separators in the set contributenot operate properly with this signal, nor can AGC and color circuits, so the picture is scrambled.




The decoder compensates by attenuating the signal during the time in which the transmitted signal was not attenuated. In order to accomplish this, the logic controlled gain switch moldiness get timing information. In-band systems transmit pulses as amplitude prosody of aural carrier or a dissipate carrier in out of band systems.

Out of band scrambling:
The usual setup is that the decoder is connected directly to the cable earlier of the channel converter. Decoding is done at the pay channel frequency. The decoder is likely to be in a separate box, added to an old system to provide pay channels. The box consists of a simple receiver (90-120 MHz) for the out-of-band data carrier and a commodious band 6db gain switch.
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