Abstract: The invention concerns a method for characterizing in accordance with specific parameters, a sound signal x(t) varying in time t in different frequency bands k, and referenced x(k, t). It consists in storing the signal x(t), calculating and storing the energy E(k, t) of said signal x(k, t) for each of said bands k, k varying from 1 to K and in accordance with a time window h(t) of duration 2N, and in a second step, calculating the energy variation and the signal phase E(k, t) in J frequency bands, the J values referenced F(j, k, t) and ?(j, k, t) thus obtained constituting the specific parameters of an extract of duration 2N of the sound signal x(t) and in repeating said calculation at every S time interval.

Abstract: A is a detachable casing capable of adapting to a computer mouse type peripheral by covering it partially. This casing comprises, firstly, at least one pressure sensor to measure the pressure exerted on this pressure sensor by an operator's hand and, secondly, linking means to address the signals coming from this sensor to the computer. The casing is inexpensive and highly ergonomical. It enables the possibilities of use of a computer to be greatly extended by increasing the number of controls performed with only one hand.

Abstract: A sound synthesis process. The invention relates to an additive sound synthesis process, as shown in FIGS. 1A and 1B, in which sample blocks (16) are determined by performing the inverse Fourier transform of successive frequency spectra. The time-superimposed sample blocks (16) are added in order to form a sequence of samples representing the reconstituted sound wave.