Electronic sound synthesizer

Details Electronic sound synthesizer Electronic sound synthesizer

G - Physics

10

K

354/43, 354/47,

G10K 15/04 (2006.01) G10H 7/00 (2006.01) H03G 3/00 (2006.01)

Patent

CA 1271845

ABSTRACT A sound source apparatus of electronic equipment employs a frequency modulation. Wave-form data of a fundamental wave and a modulation wave are both stored in a RAM as the 6-bit digital data. A sine wave signal is produced by a modulation wave frequency data and the wave-form data from the RAM, the sine wave signal is multiplied with an amplitude data of the modulation wave to obtain the modulation index data (J(t)). The frequency data(.omega.c) of the fundamental wave and the modulation index data are multiplied, and a result of the multiplication is given as a read out address of the RAM for storing the wave-form data of the fundamental wave, thereby the read out speed of the RAM is changed. The digital data read out from the RAM is converted as a sound signal of an analog signal by a D/A converter. An amplitude data (A) of the fundamental wave is further pulse-width modulated, and the digital data from the RAM is gated by the modulated pulse, thus the output of the D/A converter is activated and, therefore, the output of the D/A converter becomes to a sound signal represented by the equation e = A sin J (t) .omega.ct.

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