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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. Scrambler - Wikipedia

    en.wikipedia.org/wiki/Scrambler

    A scrambler (or randomizer) can be either: An algorithm that converts an input string into a seemingly random output string of the same length (e.g., by pseudo-randomly selecting bits to invert), thus avoiding long sequences of bits of the same value; in this context, a randomizer is also referred to as a scrambler.

  4. 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.

  5. 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 ...

  6. Cable converter box - Wikipedia

    en.wikipedia.org/wiki/Cable_Converter_Box

    A descrambler is a device that unscrambles the encoded signal and restores the picture and sound of a scrambled channel. Typical modern cable boxes include some form of descrambling ability. Such a cable box must also be addressable (see below) in order to be told to descramble the signal for a given channel.

  7. 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 ]

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  9. MLT-3 encoding - Wikipedia

    en.wikipedia.org/wiki/MLT-3_Encoding

    Example of MLT-3 Encoding. Light-colored lines indicate two previous states, where : 1337 10 = 10100111001 2 MLT-3 encoding (Multi-Level Transmit) is a line code (a signaling method used in a telecommunication system for transmission purposes) that uses three voltage levels.