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<p>using a continuous signal, which varies in amplitude, phase, or some other property. In <a href="page.php?w=baseband">baseband</a> analog transmission, messages are represented by a sequence of pulses by means of a <a href="page.php?w=line_code">line code</a>; in <a href="page.php?w=passband">passband</a> analog transmission, they are communicated by a limited set of continuously varying <a href="page.php?w=waveform">waveform</a>s, using a digital <a href="page.php?w=modulation">modulation</a> method. Passband modulation and <a href="page.php?w=demodulation">demodulation</a></p><p>
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