Abstract: Data-processings for spectrum signals which express the frequency spectrum distributions of corresponding tone waveshape signals, are performed on a frequency domain. The processed spectrum signals are transformed to the corresponding tone waveshape signals by the Fast Inverse Fourier Transform algorithm. Thus filters of desired characteristics on a frequency domain can be composed of simple and inexpensive circuits, and musical tones having desirable tone qualities with abundant varieties can be easily generated.

Abstract: An electronic musical instrument is provided with a plurality of wave shape memories storing different musical tone wave shapes of different memory sizes for different tone ranges. The memory for the treble tone is of a small size and that for the bass tone is of a large large size. When a key is operated in the keyboard, a memory corresponding to the tone range to which the operated key belongs is selected and read out. While successfully avoiding economically disadvantageous increase in the memory size of the wave shape memories, beautiful and clear musical tones can be obtained having different tone colors for different tonal pitches just like those generated by natural musical instruments.

Abstract: A touch responsive sensor for an electronic keyboard musical instrument of a variable capacitor type, which comprises a pair of electrodes spaced apart from each other, and an intermediate electrode interposed between the pair of electrodes and separated from each of the pair of electrodes by a dielectric. The intermediate electrode is movable from near one of the pair of electrodes toward the other of the pair of electrodes in accordance with the movement of each playing key of the electronic musical instrument. Thus, in the course of a key depressing movement, first and second touch responsive controlling signals are derived from, respectively, between the one of the pair of electrodes and the intermediate electrode and between the other of the pair of electrodes and the intermediate electrode in accordance with the variation of capacitance produced therebetween.