characterised by the type of parameter measurement, e.g. correlation techniques, zero crossing techniques or predictive techniques

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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 > characterised by the type of parameter measurement, e.g. correlation techniques, zero crossing techniques or predictive techniques