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A Telephone Scrambler Conversations Circuit

2016-02-09 09:59  
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In telecommunications, a scrambler is a device that transposes or inverts signals or otherwise encodes a message at the transmitter to make the message unintelligible at a receiver not equipped with an appropriately set descrambling device. Whereas encryption usually refers to operations carried out in the digital domain, scrambling usually refers to operations carried out in the analog domain. Scrambling is accomplished by the addition of components to the original signal or the changing of some important component of the original signal in order to make extraction of the original signal difficult.Two hybrids (Tl and T2) are used to allow direct connection to a telephone line. This circuit uses the common speech-inversion algorithm where the frequency of an audio signal is inverted about a center frequency.An LM1496  balanced modulator is used to heterodyne the speech range against a 3.58-kHz signal.A telephone scrambler encrypts phone conversations, keeping unauthorized users from tapping into or monitor calls with any success. Scrambling involves the encryption of data, using unique codes that render it possible only for authorized personnel to unscramble transmissions.



Telephone Scrambler Circuit