Masatada Wachi

Electronic musical instrument of wave memory reading type

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.

Slur effect pitch control in an electronic musical instrument

The present invention provides a tone color control so that the tone color in an attack portion of a tone to be generated differs depending upon whether or not a slur effect is to be imparted. If, for example, the slur effect is not imparted, a tone color for an attack portion of a tone which is rich in variation is used, whereas if the slur effect is to be imparted, a stable tone color which is the same as the sustain portion of a tone is used. In another aspect of the invention, in the case of imparting the slur effect, a tone signal is distributed to two channels and envelopes of signals in the respective channels are separately and independently controlled by separate control signals. In one channel, a control signal of decay characteristics is used whereas in the other channel, a control signal of attack characteristics is used. The changing rate of the control signal of the attack characteristics is made greater than that of the control signal of the decay characteristics.

Process for forming musical tones

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.

Method and apparatus for generating musical tone signals

A method and an apparatus for producing a musical tone of the so-called partial tone synthesizing type are disclosed, in which the sampling frequencies are established with respect to the respective partial tone components to satisfy the sampling theorem, and the highest frequency among the sampling frequencies is used as a reference frequency. Ratios of sampling frequencies of respective partial tone components to the reference frequency are determined. A partial tone component having a ratio of one is calculated with one channel at a period corresponding to the reference frequency whereas a plurality of partial tone components each having a ratio of less than one are combined into a set wherein the sum of the ratios of the combined partial tone components does not exceed one and the plurality of partial tone components are calculated on the time division basis with one channel at periods corresponding to the respective sampling frequencies.

Electronic musical instruments of the type synthesizing a plurality of partial tone signals

A predetermined frequency signal is amplitude modulated with a time window signal having a predetermined time width to simultaneously calculate a plurality of frequency components distributed over a predetermined frequency bandwidth and having the frequency component as a center component, and the plurality of frequency components thus calculated are used as partial tone components to form a musical tone signal. The frequency signal and the time window signal are formed by using a common function signal generator, on a time division basis, which produces the frequency signal and the time window signal. This construction makes it possible to form a musical tone having a great number of harmonic components at high speeds with a simple circuit construction.

Electronic musical keyboard instruments with variable touch sensitivity

An electronic musical instrument having a keyboard, includes a plurality of keys, a plurality of musical tone signal generation systems, a touch detector for producing touch data representing a key touch accompanied by a key depression, a panel operation unit for setting a touch sensitivity representing a sensitivity with respect to a key touch for each of the musical tone signal generation systems, and a register unit for modifying the touch data in accordance with the touch sensitivity corresponding to each of the musical tone signal generation systems. Different tone groups are assigned to the musical tone signal generation systems, and a musical tone signal which has a tone color belonging to the corresponding musical tone group and a pitch corresponding to a key depression is produced from each of the musical tone signal generation systems. Each musical tone group includes at least two tone colors having a common attribute. The musical tone signals from the corresponding musical tone signal generation systems are controlled in accordance with the modified touch data corresponding to the musical tone signal generation systems obtained from the register unit.

Emphasize system for electronic musical instrument

An emphasize system for an electronic musical instrument including filter and control device. The filter extract and output predetermined frequency range component of an input musical tone signal. The control device control the level of an output from the filter at least on the basis of an output from an envelope generator which controls the level of the input musical tone signal, or on the basis of the level of another frequency range component of the input musical tone signal. At least the level controlled signal is outputted from the system.