Sound synthesis with fixed partition size convolution of audio signals

摘要

A method for convolving an input signal with an impulse response function, the impulse response function being 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 of the input signal; 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 by performing scaling of input signals, multiplication, and accumulation using fixed-point arithmetic.

主权项

1. A method, comprising:
converting a frequency spectrum of a segment of an input signal and a frequency spectrum of a corresponding segment of an impulse response function from a floating point data format to a fixed point integer data format;multiplying the converted frequency spectrum of the segment of the input signal with the converted frequency spectrum of the corresponding segment of the impulse response function; and generating a desired convolved signal corresponding to a convolution involving the segment of the input signal and the corresponding segment of the impulse response function in the time domain using multiplication results from said multiplying.