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What Is PCM (Pulse Modulation Systems)?

modulation PCM pulse SYSTEMS
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What Is PCM (Pulse Modulation Systems)?

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A series of regularly recurring pulses is made to vary in amplitude, duration, shape, or time as a function of the modulating signal Used to transmit both analog and digital information, such as voice and data.The analog signal is sampled, digitized and encoded into a digital pulse stream.If the signal is already is in digital form, it may be encoded into a digital pulse train. Initially invented by A.H. Reeves in 1937 Pulse Code Modulation is the representation of a signal by a series of digital pulses firstly by sampling the signal, quantizing it and then encoding it. The PCM signal itself is a succession of discrete, numerically encoded binary values derived from digitizing the analog signal. PCM Steps Sampling – PAM – Nyquist sampling rate theorem Quantizing – Uniform and non uniform – A- Law and m- Law Encoding – Binary sequences. Pulse Modulation Examples Pulse-amplitude modulation (PAM) Delta modulation (DM) Pulse-width modulation (PWM) Pulse-code modulation (PCM) Pulse-position

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