TDM, PAM, PPM, PWM
TDM, PAM, PPM, PWM
TDM:Time-division multiplexing:
"Time-division multiplexing (TDM) is a method of transmitting and receiving independent signals over a common signal path by means of synchronized switches at each end of the transmission line so that each signal appears on the line only a fraction of time in an alternating pattern".
Video Lecture on Time-division multiplexing:
PAM: Pulse-amplitude modulation (PAM):
"Pulse-amplitude modulation (PAM), is a form of signal modulation where the message information is encoded in the amplitude of a series of signal pulses. It is an analog pulse modulation scheme in which the amplitudes of a train of carrier pulses are varied according to the sample value of the message signal".
Video Lecture on Pulse-amplitude modulation (PAM):
PWM:Pulse Width Modulation:
"Pulse Width Modulation, or PWM, is a technique for getting analog results with digital means. Digital control is used to create a square wave, a signal switched between on and off".
Video Lecture on Pulse Width Modulation:
PPM:Pulse-position modulation (PPM):
"Pulse-position modulation is a form of signal modulation in which M message bits are encoded by transmitting a single pulse in one of 2 M possible required time-shifts".
Video Lecture on Pulse-position modulation (PPM):
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