Music – Instruments – Electrical musical tone generation
Patent
1995-05-09
1997-09-23
Wysocki, Jonathan
Music
Instruments
Electrical musical tone generation
84603, 84622, G10H 700
Patent
active
056707282
ABSTRACT:
A pitch-asynchronous-type musical tone creating apparatus, provided for an electronic musical instrument, comprises at least a waveform memory, a low-pass filter and an interpolation section. Waveform samples, stored by the waveform memory, are sequentially read out, so that the interpolation section performs interpolation process on the waveform samples to create interpolation samples. Musical-tone parameters, such as a tone-color characteristic and an envelope characteristic, are imparted to the interpolation samples so as to create musical-tone samples. When performing reading operations on the waveform memory at a high speed which causes skipping of the reading operations, certain frequency components, which cause occurrence of folding noises, are incorporated into the interpolation samples. Those frequency components are removed from the waveform samples, read from the waveform memory, by the low-pass filter whose cut-off frequency is determined responsive to a frequency number. The frequency number is set responsive to a pitch designated for a musical tone to be produced. The low-pass filter is activated only when the frequency number is larger than a certain number so that skipping of the reading operations may occur. The musical-tone samples are accumulated with respect to a plurality of channels which operate in a time-division manner, so that musical tone signals, corresponding to musical tones to be produced, are created based on the musical-tone samples accumulated.
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Ogai Yoichiro
Shimizu Masahiro
Fletcher Marlon T.
Wysocki Jonathan
Yamaha Corporation
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