The Philosophy of PCM

@article{Oliver1948ThePO,
  title={The Philosophy of PCM},
  author={B. M. Oliver and John R. Pierce and Claude E. Shannon},
  journal={Proceedings of the IRE},
  year={1948},
  volume={36},
  pages={1324-1331}
}
Recent papers describe experiments in transmitting speech by PCM (pulse code modulation). This paper shows in a general way some of the advantages of PCM, and distinguishes between what can be achieved with PCM and with other broadband systems, such as large-index FM. The intent is to explain the various points simply, rather than to elaborate them in detail. The paper is for those who want to find out about PCM rather than for those who want to design a system. Many important factors will… 
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  • G. Sage
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    IEEE Transactions on Aerospace and Electronic Systems
  • 1966
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TLDR
The implementation of the aforementioned systems using Simulink (The Math Works, Inc., USA) on a multithreaded processor computer is discussed, to prove the importance of DPCM over PCM system in eliminating such effects and ensuring a successful transfer of data.
The past, present and future of PCM
TLDR
The pulse code modulation future depends a great deal on how well or how badly its main planning problems are tackled during the next decade or so, and there is little or no agreed view on the technical and more general points involved in this planning.
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References

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PCM, pulse count modulation, is a recent development in the field of pulse time multiplexing. Computations and experimental work indicate that accepted standards of telephone transmission over wire
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TLDR
Experiments indicate that a three- unit code appears to be necessary for a minimum grade of circuit, while a six- or seven-unit code will provide good quality.
PCM equipment
PCM, pulse code modulation, is a new solution to the problem of overcrowded frequency spectrum. It appears to have exceptional possibilities from the standpoint of freedom from interference, and
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TLDR
Coding and decoding devices are described, along with other circuit details, of a 96-channel pulse Code Modulation system designed to meet the transmission requirements commonly imposed upon commercial toll circuits.
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In this final installment of the paper we consider the case where the signals or the messages or both are continuously variable, in contrast with the discrete nature assumed until now. To a