Unwanted sound, as opposed to "signal", meaning desired sound, as in "signal-to-noise ratio"

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Audio noiseless video becomes noisy after importing in windows movie maker

I am getting a problem whenever I import a video having formats in wmv & avi in windows movie maker, the audio becomes noisy I dont why it is happening may be is it the bitrate issue or something ...
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Minimising image noise within the recording of indoor office environments

Background I have a Panasonic HDC-HS700 camera that I am using to record indoor office scenes. The scenes are illuminated predominantly by fluoro lighting, with little natural light, however there ...