DESCRIPTIONS 8 . 1 Occam filtering in noise reduction and speech enhancement ( DIC )

Introduction Occam Filters are a general technique for filtering random noise by data compression. The essence of Occam filtering can be described as follow. Compress the noisy signal with a lossy compression algorithm, with the allowed loss set equal to the noise strength, and then do the decompression. The decompressed signal is the filtered signal. The idea originates from the fact that when a noisy signal is compressed by a lossy compression algorithm, the loss and the noise tend to cancel rather than add up. When the loss of the compression equals to the noise strength, very good noise reduction performance can be achieved [1] [2].