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#1 Income Generating Computer Business In 2003
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Pulse-coded modulation.
In pulse-coded modulation (PCM), the intelligence signal
converts the carrier into a series of constant-amplitude pulses
spaced in such a manner that the desired intelligence is
contained in coded form. Continuous signals, such as voice
messages, television pictures, and computer data, are
commonly transformed into the Baudot Code or its variations,
which are composed of patterns of 5 or 7 "on" and
"off" pulses. PCM minimizes transmission losses and
eliminates noise and interference problems because the receiving
unit need only detect and identify simple pulse patterns.
Moreover, the pulses, unlike continuous signals, can be
regenerated electronically by repeater stations along the
transmission route with virtually no distortion.
PCM, invented by H.A. Reeves of the United States in 1939, is
employed by many communications companies and organizations,
including Comsat and Intelsat, for telegraph, telephone, and
television transmission. The technique has proved especially
useful for the exchange of digital information between computer
terminals.
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