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This was the 1st Research Publication by Dr David E Probert from the time that he spent at the British Telecom Research Laboratories (previously GPO Research) - Dollis Hill, London (now Martlesham Heath, Ipswich) - during June 1970. The topic is the modelling of Signal/Noise Ratio for Digital Communications Networks (Pulse Code Modulation) which were just being introduced to replace analogue systems in the early 1970s. Read less