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  2. Television encryption - Wikipedia

    en.wikipedia.org/wiki/Television_encryption

    The most common of these was a channel-based filter that would effectively stop the channel being received by those who had not subscribed. These filters would be added or removed according to the subscription. As the number of television channels on these cable networks grew, the filter-based approach became increasingly impractical.

  3. QAM (television) - Wikipedia

    en.wikipedia.org/wiki/QAM_(television)

    An integrated QAM tuner allows the free reception of unscrambled digital programming sent "in the clear" by cable providers, usually local broadcast stations, cable radio channels, or in the case of providers which have transitioned to do so, Public-access television cable TV channels. Which channels are scrambled varies greatly from location ...

  4. Scrambler - Wikipedia

    en.wikipedia.org/wiki/Scrambler

    Descramble in cable television context is the act of taking a scrambled or encrypted video signal that has been provided by a cable television company for premium television services, processed by a scrambler and then supplied over a coaxial cable and delivered to the household where a set-top box reprocesses the signal, thus descrambling it ...

  5. Free-to-air - Wikipedia

    en.wikipedia.org/wiki/Free-to-air

    All of Malta's national and political party channels are available free-to-air. The national channels TVM and TVM2, Parliament TV and the political party channels NET and ONE, all are broadcast via the free-to-air DVB-T service. Even HD versions of these channels are available free-to-air. The only scrambled channel in Malta is ITV Teleshopping.

  6. Voice inversion - Wikipedia

    en.wikipedia.org/wiki/Voice_inversion

    In the simplest form of voice inversion, the frequency of each component is replaced with , where is the frequency of a carrier wave. This can be done by amplitude modulating the speech signal with the carrier, then applying a low-pass filter to select the lower sideband . [ 1 ]

  7. Common Scrambling Algorithm - Wikipedia

    en.wikipedia.org/wiki/Common_Scrambling_Algorithm

    However, as all operations are on 8-bit subblocks, the algorithm can be implemented using regular SIMD, or a form of “byteslicing”. As most SIMD instruction sets, (with the exception of AVX2 ) do not support parallel look-up tables, the S-box lookups are done in a non-bytesliced implementation, but their integration into the rest of the ...

  8. Communication channel - Wikipedia

    en.wikipedia.org/wiki/Communication_channel

    The radio channel between an amateur radio repeater and an amateur radio operator uses two frequencies often 600 kHz (0.6 MHz) apart. For example, a repeater that transmits on 146.94 MHz typically listens for a ham transmitting on 146.34 MHz. All of these communication channels share the property that they transfer information.

  9. Source–message–channel–receiver model of communication

    en.wikipedia.org/wiki/Source–message–channel...

    The source–message–channel–receiver model is a linear transmission model of communication. It is also referred to as the sender–message–channel–receiver model, the SMCR model, and Berlo's model. It was first published by David Berlo in his 1960 book The Process of Communication.