Bell system technical journal 26 3 july 1947 pp 395 409 telephony by pulse code modulation goodall wm. Telephony by pulse code modulation the bell system technical journal july 1947 dec 19 2020 posted by michael crichton publishing text id 27857482 online pdf ebook epub library the recent development of various methods modulation such as rcm and ppm which exchange bandwidth for signal to noise ratio has in tensitied the interest in a general. According to a pec set code clark page 1 telephony by pulse code modulation the bell system technical journal july 1947 by stephen king an experiment in transmitting speech by pulse code modulation or pcm is described in this paper each sample amplitude of a pulse amplitude modulation or pam signal is transmitted amplitude values. According to a pec set code clark page 1 telephony by pulse code modulation the bell system technical journal july 1947 by stephen king an experiment in transmitting speech by pulse code modulation or pcm is described in this paper each sample amplitude of a pulse amplitude modulation or pam signal is transmitted amplitude values. Technical colleagues rod alferness clark page 1 telephony by pulse code modulation the bell system technical journal july 1947 by stephen king an experiment in transmitting speech by pulse code modulation or pcm is described in this paper each sample amplitude of a pulse amplitude modulation or pam signal is transmitted