Reporter: Wendylyn R. Banguis PULSE MODULATION Reporter: Wendylyn R. Banguis

Pulse Modulation Pulse modulation is a type of modulation in which pulses are varied in some respect, such as width or amplitude, to represent the amplitude of a signal. The amplitude, frequency or phase of sinusoidal carrier can be modulate with an information signal, so the amplitude, frequency or phase (or position) of pulses in a pulse train can also be modulated .

Pulse Amplitude Modulation (PAM) The modulation in which the instantaneous amplitude of the pulsed carrier is varied according to the message signal . Pulse Time Modulation (PAM) The pulsed carrier wave is varied on the time (horizontally) Pulse Width Modulation The width of the pulses of the carrier is varied according to the message signal. Pulse Position Modulation The position of the pulsed carrier is varied according to the message signal value.

Pulse Code Modulation (PCM)   It is a method used to digitally represent sampled analog signals. It is the standard form of digital audio in computers, compact disks, digital telephony and other digital audio applications. In a PCM stream, the amplitude of the analog signal is sampled regularly at uniform intervals, and each sample is quantized to the nearest value within a range of digital steps