Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04B
TRANSMISSION
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H04B3/20
Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
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H04B3/23
using a replica of transmitted signal in the time domain, e.g. echo cancellers
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H04B3/232
using phase shift, phase roll or frequency offset correction
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