I am creating a piece of software that detects when speech starts in an audio recording. Before performing onset detection I would like to remove any noise that may cause any false positives. Which would be the best low-pass filter to use for this?
Maybe I went too far in saying that I am performing onset detection. Basically all I am doing is looking for the first time the amplitude goes above a certain value and taking that as a flag for the start of the envelope. It is simple and crude, but I believe if my low-pass filter successfully removes noise then the onset detection should work. Or am I totally off on this?