Demodulation of encrypted channels

November 3, 2003.

The use of encryption systems is widely spread in digital pay television. the operator encodes the signals and the subscriber holds a Smart Card Giving access to those channels. The main limitation with this kind of solution is that each receiver specialises in a specific encryption system and can not be used for another system.

Demodulation of encrypted digital channels "Common Interface": patented by PROMAX

There is one alternative known as “Common Interface” which allows the use of standard receivers. In this case the receiver has a slot to insert various coditional access modules (CAM) and their corresponding Smart Cards. This lets the user access the digital television content of various providers, even if they use different encryption systems.

Digital TV decoding

PROMAX holds a patent over the use of “common interface” in test equipment.