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The main modulation function is signal transformation or transfer from low-frequency range to higher for further transfer through radio or cable carrier line.

Phase Modulation
Phase Modulation is analog signal (carrier) transformation type when the signal changing parameter is its phase.

PSK – phase shift keying
Phase shift keying is a signal transform method when the carrying oscillation phase changes abruptly depending on the discrete data messages.

A pulse is a sporadic increase or decrease in a current flow. Idealy the pulse would have a rise and a fall.

Pulse generator is a source of pulse signals for the regulation of measurements in electronic circuits and instruments.

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