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)

Introduced: January 2000

Title

Titles differ between systems:

IPC: Speech enhancement, e.g. noise reduction or echo cancellation

CPC: 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)

Full Title

Full titles differ between systems:

IPC:

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

CPC:

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)

IPC and CPC are identically structured here. All 4 subcodes exist in both systems.

IPC defines codes here since 2013.

Child Classifications

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G10L 21/0208 Noise filtering since 2013 +3 CPC IPC+CPC Available in IPC and CPC
G10L 21/0272 Voice signal separating since 2013 IPC+CPC Available in IPC and CPC
G10L 21/0316 by changing the amplitude since 2013 IPC+CPC Available in IPC and CPC
G10L 21/038 using band spreading techniques since 2013 IPC+CPC Available in IPC and CPC