SOUND SYNTHESIS WITH FIXED PARTITION SIZE CONVOLUTION OF AUDIO SIGNALS

摘要

A method for convolving an input signal with an impulse response function partitioned into a plurality of time segments of equal size, the method including transforming a segment of an input signal into the frequency domain to generate a frequency spectrum of the segment; multiplying the frequency spectrum of the segment of the input signal with a frequency spectrum of each of the segments of the impulse response function; scaling the results from the multiplication of frequency spectra; accumulating the scaled results; and performing an inverse transform on the accumulated signals to generate a desired convolved signal in the time domain. The scaling includes performing a bitwise shift operation on the multiplication results, and performing the bitwise shift operation includes adding a bit to the multiplication results before the bitwise shift operation. Fast convolution of uniformly partitioned impulse response functions can be achieved using fixed-point arithmetic.