Signal processing method and device

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, an average of both the numerator and the denominator and inverses thereof, an average of an absolute value of x/an absolute value of y, absolute value of x/an average of the absolute value of y, average x2/y2, x2/average y2, average of an absolute value of y/an absolute value of x, absolute value of y/an average of the absolute value of x, average y2/x2, and y2/average x2 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.