Each sample amplitude of a pulse amplitude modulation or pam signal is transmitted by a code group telephony by pulse code modulation goodall 1947 bell system technical journal wiley online library. Full text of the bell system technical journal see other formats . Pulse code modulation pcm is a method used to digitally represent sampled analog signalsit is the standard form of digital audio in computers compact discs 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. Bell system technical journal 39 4 july 1960 pp 973 994 the construction of missile guidance codes resistant to random interference eckler ar topics codes false pulses command code mod security missile commands pulse false pulses the bell system technical journal 1922 1983 407 407 bstj 30 1 january 1951 television by pulse code modulation goodall wm texts . Differential pulse code modulation dpcm was invented by c chapin cutler at bell labs in 1950 and his patent includes both methods dpcm is a signal encoder that uses the baseline of pcm but adds some functionality based on the prediction of the samples of the signal the input can be an analog signal or a digital signal if the input is a continuous time analog signal it needs to be
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