Music – Instruments
Patent
1975-09-16
1976-09-28
Hix, L. T.
Music
Instruments
84 101, 84 124, G10F 100
Patent
active
039824608
ABSTRACT:
An apparatus for forming a musical-tone waveform for an electronic musical instrument characterized in that at least one cycle of a musical-tone waveform, which it is desired be produced, is divided in amplitude by dividing lines at equal intervals and sampling points on a time axis are determined from respective crossing points between the waveform and the dividing lines and the distance between the initial and the final sampling points is represented by an appropriate number of pulses so that each sampling point may be represented by a pulse number. There is further provided a memory circuit wherein each sampling point, that is, the pulse number thereof is set up in the form of a digital signal. Additionally, there is a set up in the form of a digital signal a tendency such as increase, decrease or equal at each sampling point with reference to the preceding sampling point. An envelope setting device is used wherein the envelope of a muscial-tone waveform, which it is desired be produced, is subjected to sampling and the analog amount of each sampling point is set up in the form of digital signal. An accumulatively adding device is employed whereby the output digital signal of the envelope setting device is accumulatively added to or subtracted from the output digital signal of the memory circuit. The accumulatively adding device is connected at its output terminal to a D-A converter for converting its output signal into an analog signal.
REFERENCES:
patent: 3515792 (1970-06-01), Deutsch
patent: 3742755 (1973-07-01), Watson
patent: 3763364 (1973-10-01), Deutsch et al.
patent: 3809789 (1974-05-01), Deutsch
patent: 3882751 (1975-05-01), Tomisawa et al.
patent: 3895553 (1975-07-01), Kawamoto
Ezawa Sadaaki
Hashizume Hikaru
Kameyama Seiji
Kondo Tatsunori
Kugisawa Toshio
Hix L. T,.
Kabushiki Kaisha Kawai Gakki Seisakusho
Miska Vit W.
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