Title :
Pulse Code Modulation
Author :
Black, H.S. ; Edson, J.O.
Author_Institution :
High frequency transmission engineer, transmission development department, Bell Telephone Laboratories, Inc., New York, N. Y.
Abstract :
A radically new modulation technique for multichannel telephony has been developed which involves the conversion of speech waves into coded pulses. An 8-channel system employing pulse code modulation (PCM) and embodying these principles was produced. The method appears to have exceptional possibilities from the standpoint of freedom from interference, but its full significance in connection with future radio and wire transmission may take some time to reveal.
Keywords :
Amplitude modulation; Frequency; Interference; Modulation coding; Phase change materials; Pulse modulation; Sampling methods; Speech; Telephony; Wire;
Journal_Title :
American Institute of Electrical Engineers, Transactions of the
DOI :
10.1109/T-AIEE.1947.5059525
