a technique involves using a fast fourier transform module to transform multiple different types of signals . this may be accomplished using one or more of three techniques : logic within the fft module can enable different processing depending upon a processing state , the fft module can be called iteratively to transform a signal that is larger than the fft implemented in the fft module , the fft module can be used for parallel transformation of multiple signals that are smaller than the fft implemented in the fft module . thus , a single fft module can be used to transform a first type of signal and a second type of signal if configured according to the technique .