G - Physics – 10 – H
Patent
G - Physics
10
H
84/1.1
G10H 1/00 (2006.01) G06F 1/02 (2006.01) G10H 7/12 (2006.01)
Patent
CA 1124112
Abstract of the Disclosure A method for producing a tone waveform having a desired spectral construction by modulating an input address signal of a selected frequency for a waveform memory. For the modulation of the input address signal, the output of the waveform memory is multiplied by a parameter .beta. of a suitable value and the multiplication product is added to the input address signal. If the input address varies in the manner of, for example, a saw-tooth wave, a desired tone waveform can be produced within a range between a saw-tooth wave and a sinusoidal wave by selecting a suitable value of the parameter .beta. . More specifically, a saw-tooth wave is produced as a tone wave form if a sufficiently large value of .beta. is selected. As .beta. is gradually decreased, the amplitude is decreased from a higher order and the amplitude also disappears from a higher order until the tone waveform becomes a sinusoidal wave when .beta. is zero. The waveform memory having its input address modulated in the above described manner is used not only for directly producing a desired tone waveform but for modulating an input address of another waveform memory. In the latter case, a tone waveform is produced by the other waveform memory.
330953
Macrae & Co.
Nippon Gakki Seizo Kabushiki Kaisha
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