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<p>many kinds of demodulators. For example, in a <a href="page.php?w=modem">modem</a>, which is a contraction of the terms modulator/demodulator, a demodulator is used to extract a serial digital data stream from a <a href="page.php?w=carrier_signal">carrier signal</a> which is used to carry it through a <a href="page.php?w=telephone_line">telephone line</a>, <a href="page.php?w=coaxial_cable">coaxial cable</a>, or <a href="page.php?w=optical_fiber">optical fiber</a>.</p>

<p><big> History </big></p>
<p>Demodulation was first used in <a href="page.php?w=radio_receivers">radio receivers</a>.</p><p>
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