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Windows 7 does not natively support voice biometrics for login purposes, it is considered a security risk by Microsoft & as such (as you mentioned) the voice recognition software can only be launched once you are logged in to the operating system. There are some services which you can use to customize your experience, such as: Voicevault.com


ffmpeg doesn't have any decent audio filters for noise-reduction built in. Audacity has a fairly effective NR filter, but it's designed to be used with 2-pass operation with a sample of just the noise, and then the input. The comments at the top of https://code.google.com/p/audacity/source/browse/audacity-src/trunk/src/effects/NoiseReduction.cpp explain ...

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