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PCE
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DIFF Subgroup
H04B 3/21

using a set of bandfilters

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Line transmission systems > Details > Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other > using a set of bandfilters

CPC:

Line transmission systems (combined with near-field transmission systems H04B5/00) > Details > Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other > using a set of bandfilters

No child classifications to compare. This is a leaf node in both IPC and CPC.