JPS6291698U - - Google Patents

Description

[Brief explanation of the drawing]

The figure is an explanatory diagram showing the configuration of an embodiment of the present invention. In the figure, 100 is a multitone synthesizer, 101 is a keyboard switch, 102 is a key assigner, 103 is a control circuit, 104 is a word counter, 105 is a main clock, 106, 141 is a tone clock, 107 is a clock selector, 108, 110, 111, 131
, 135 is a multiplier, 109, 116, 124, 1
28 is an adder, 112, 136 are tone shift registers, 113, 137 are load selectors, 114 are tone selectors, 115, 126, 130 are sine wave tables, 117, 118, 119 are data selectors,
120, 125, 144 are memory address decoders, 121, 132 are digital-to-analog converters, 122, 133 are amplifiers, 123 is an envelope circuit, 127 is an audio system, 129 is a main register, 138, 139, 140 are _K1, respectively. ，
K ₂ and K ₃ generators, 142 and 143 are modulation index generators, and 150 is a sound source circuit.

Claims (1)

[Claims for Utility Model Registration] Control means 103 for controlling calculations; means 104 for generating a signal indicating a number _of sample points of a composite waveform; 1. Means 108, 138 for obtaining the respective angular velocities ω _m1 and ω _m2 of the second frequency modulated waves;
110, 139, 111, 140, and a modulation index I ₁ of the first and second frequency modulated waves.
(t), I ₂ (t) generating means 142, 13
5, 143, 131, and two equations e(t) based on the signals from each of the above means.
=A(t)sin[ω _c (t)+I ₁ (t)si
nω _m1 (t)+I ₂ (t) sinω _m2 (t)
]...(Formula a) and e(t)=A(t)sin[
ω _c (t)+I ₁ (t) sin {ω _m1 (t)+
_I2 (t) _sinωm2 (t)}]...Means 120, 126, 125 for performing waveform calculations on (formula b)
, 130, 144, 115, etc., and a first waveform memory means 1 for storing waveform data.
29, setting the calculated waveform data in the first waveform memory means, or adding the contents of the first waveform memory means and the calculated waveform data from the waveform calculation means, and then resetting the calculated waveform data to the first waveform memory means; The second waveform memory means 112 and 136 are configured to read out the waveform data transferred from the first waveform memory means at a frequency corresponding to the musical scale. , the control means stores in the first waveform memory means composite waveform data of the waveform data obtained by the calculation formula (formula a) by the calculation means and the waveform data obtained by the other calculation formula (formula b). or the first
It is possible to synthesize and set waveform data having the same calculation formula but different angular velocities ω _c , ω _m1 , ω _m2 or modulation indices I ₁ (t), I ₂ (t) in the waveform memory means of An electronic musical instrument characterized by being equipped with a sound source circuit.