Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04B
TRANSMISSION
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1/00
Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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H04B1/66
for reducing bandwidth of signals; for improving efficiency of transmission
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H04B1/662
using a time/frequency relationship, e.g. time compression or expansion
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