Telephone Scrambler Circuit

Posted on Jun 16, 2012

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.

Telephone Scrambler Circuit
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An LM1496 balanced modulator is used to heterodyne the speech range against a 3.58-kHz signal.

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