G10L 21/0208 Noise filtering
Introduced: January 2013
Full Title
Full titles differ between systems:
Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility > Speech enhancement, e.g. noise reduction or echo cancellation > Noise filtering
Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility (G10L19/00 takes precedence) > Speech enhancement, e.g. noise reduction or echo cancellation (reducing echo effects in line transmission systems H04B3/20; echo suppression in hands-free telephones H04M9/08) > Noise filtering
CPC subdivides this area 3x more granularly than IPC with 3 additional codes.
3 codes are CPC-only extensions.
Note: 3 CPC extensions are marked as secondary classification only.
IPC defines codes here since 2013.
Child Classifications
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- G10L 21/0216 characterised by the method used for estimating noise since 2013 +2 CPC IPC+CPC Available in IPC and CPC
- G10L 21/0264 characterised by the type of parameter measurement, e.g. correlation techniques, zero crossing techniques or predictive techniques since 2013 IPC+CPC Available in IPC and CPC