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Definition of "pulse code modulation (PCM)" |
a process in which an analog signal is sampled, the sampled value is then quantized, the quantized level is (usually binary) encoded, and finally the code is represented by pulses exhibiting amplitude, phase or frequency modulation. |
Definition of "pulse-code modulation (PCM)" |
(1) a digital encoding technique whereby an analog signal is converted into a sequence of digital words in a periodic pulse train. The PCM process starts by bandlimiting the analog input waveform to one half the sampling rate (See aliasing). The analog signal is periodically sampled, using flat-top PAM ( See pulse amplitude modulation). The height of each pulse is then quantized (estimated at an integer value) using an analog-to-digital converter, with the number of discrete quantizing levels determined by the resolution of the ADC used. The integer number associated with each sample is converted into binary format, then serially transmitted (MSB first). Note that for an 8-bit resolution ADC, each amplitude sample from the original analog waveform requires a sequence of 8 data bits in the output pulse train to represent it; as such, the output data clock rate must be at least eight times faster than that of the clock used to sample the analog input waveform. See also analog-to-digital conversion and quantization. |
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