1. A convolution method of time domain convolving an input signal with a second signal comprising the steps of: (a) dividing the second signal into a series of segments; (b) determining a magnitude envelope for each of the segments; (c) scaling signal values within each segment relative to the envelope to produce corresponding segment scaled signal values; (d) multiplying the segment scaled signal values by a corresponding input signal value to produce corresponding segment output values; (e) scaling the segment output values by a segment scale factor to produce corresponding scaled segment outputs; (f) adding the scaled segment outputs to produce a time domain output.