G10L 25/78 Detection of presence or absence of voice signals (switching of direction of transmission by voice frequency in two-way loud-speaking telephone systems H04M9/10)
Introduced: January 2013
Title
Titles differ between systems:
IPC: Detection of presence or absence of voice signals
CPC: Detection of presence or absence of voice signals (switching of direction of transmission by voice frequency in two-way loud-speaking telephone systems H04M9/10)
Full Title
Full titles differ between systems:
Speech or voice analysis techniques not restricted to a single one of groups > Detection of presence or absence of voice signals
Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 (muting semiconductor-based amplifiers when some special characteristics of a signal are sensed by a speech detector, e.g. sensing when no signal is present, H03G3/34) > Detection of presence or absence of voice signals (switching of direction of transmission by voice frequency in two-way loud-speaking telephone systems H04M9/10)
Of 4 combined children, 3 exist in both systems.
1 codes are CPC-only extensions.
Note: 1 CPC extensions are marked as secondary classification only.
IPC defines codes here since 2013.
Child Classifications
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- G10L 25/87 Detection of discrete points within a voice signal since 2013 IPC+CPC Available in IPC and CPC