SOUND SYNTHESIS DEVICE USING MODULATED NOISE SIGNAL

A device for sound synthesis intended to generate a desired acoustic signal includes a first signal source which emits a periodic signal having a given repetition frequency as a representation of the voiced parts of the desired acoustic signal, a second signal source which emits an aperiodic signal or a noise signal as a representation of the unvoiced parts of the desired sound signal, a combination circuit which combines the signals of the two signal sources with each other, and a filter circuit having a variable transmission function for processing the combined signal into the desired output signal. A third signal source emits a modulated noise signal consisting of a train or sequence of noise bursts of comparatively short duration, whose temporal envelope is synchronous with the temporal envelope of the periodic signal and which invariably have at least approximately the same energy. The modulated noise signal is supplied, together with the signal of the first signal source, to a further combination circuit.