Signal processing method and device

摘要

A signal processor includes: a first adaptive filter that takes a first signal as input and generates a first pseudo signal; a first subtractor that subtracts the first pseudo signal from a second signal to supply a first differential signal as output; a second adaptive filter that takes the first signal as input to generate a second pseudo signal; a second subtractor that subtracts the second pseudo signal from the second signal to supply a second differential signal as output; a first step size control circuit that generates a first step size used in updating the first adaptive filter in accordance with the relation between the second pseudo signal and the second differential signal; and a second step size control circuit that generates a second step size used in updating the second adaptive filter in accordance with the relation between the first signal and the second signal.

主权项

1. A signal processing method, implemented by a noise canceller having a first terminal and a second terminal configured to respectively receive a first acoustic signal (x) and a second acoustic signal (y) from at least one acoustic transducer, for using said first acoustic signal (x) and said second acoustic signal (y), each containing a desired signal with different rates of content, to extract the desired signal, said signal processing method comprising the steps of:
using an intensity ratio selected from a group consisting of absolute value of x/((absolute value of y)+c), x2/(y2+c), absolute value of y/((absolute value of x)+c), y2/(x2+c), a ratio of an average of at least one of the numerator and the denominator of the preceding members of the group and inverses thereof and an average of both the numerator and the denominator and inverses thereof to control a first signal process that operates by taking said first acoustic signal and said second acoustic signal as input, where c is a predetermined stabilizing value; and using the result of said first signal process to control a second signal process that operates by taking said first acoustic signal and said second acoustic signal as input in addition to the result of said first signal process.