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

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)

Child Classifications

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• G10L 21/0208 Noise filtering
• G10L 21/0272 Voice signal separating
• G10L 21/0316 by changing the amplitude
• G10L 21/038 using band spreading techniques