Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04B
TRANSMISSION
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14/00
Transmission systems not characterised by the medium used for transmission
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H04B14/02
characterised by the use of pulse modulation
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H04B14/06
using differential modulation, e.g. delta modulation
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H04B14/066
using differential modulation with several bits [NDPCM]
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H04B14/068
with adaptive feedback
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