Processing a signal to avoid aliasing and errors due to windowing

摘要

The present invention relates to a method and apparatus for signal processing through the manipulation of a time-domain signal (106) by using a conversion into the frequency domain comprising: forming (107) a plurality of overlapping time segments representing an input signal; applying a first window function (108) to each of the overlapping time segments and converting the windowed overlapping time segments into respective frequency segments (109); converting each of the respective frequency segments (109) to respective time segments (111); and applying a composite window function (110) to each of the respective time segments and combining the windowed respective time segments to produce an output signal (112). The method is particularly useful for applications requiring the manipulation of a time signal in the frequency domain, for example in manipulating signal to noise ratios by estimating the noise and removing this from the signal, or altering the sampling frequency.