Abstract: Through the analysis of the characteristics of speech signals and noises in the cockpit, a new speech enhancement method which can be called “arithmetic joining” is proposed based on the separate enhancement against classified noise, and the effect of the “arithmetic joining” order is also discussed in detail. Based on the separate reduction of pulse noise, periodic noise and broadband noise, an interactive speech enhancement system is developed in MATLAB GUI Builder using the M program language of MATLAB. Listening tests show that the speech enhancement result realized by this system is satisfactory.

Key words: speech enhancement, short-time Fourier transform, noise, arithmetic joining, cockpit