发明名称 |
HOURLY CHANGER FOR FUNDAMENTAL FREQUENCY FOR MUSICAL TONE GENERATOR USING MEMORIZED WAVEFORM |
摘要 |
A keyboard operated musical instrument is disclosed in which musical tones are created by reading out data values stored in a waveshape memory. The number of stored data points is reduced by storing the data values in segments corresponding to one-half of the number of data points for a period of a waveshape. By using synthesized data having a symmetry about the midpoint, the second half of the waveshape is recovered by a forward and backward memory address read of each waveshape segment. After reading each segment a predetermined number of cycles, an abrupt jump is made to the next segment of waveshape data points. The fundamental frequency of the tone is varied in a temporal manner by changing the memory advance rate of reading waveshape data out of memory in response to a frequency offset data corresponding to each segment of the waveshape data. An alternative embodiment is disclosed for a tone generator in which the musical waveshape is computed in real time from stored sets of harmonic coefficients. |
申请公布号 |
JPS62247398(A) |
申请公布日期 |
1987.10.28 |
申请号 |
JP19870094228 |
申请日期 |
1987.04.16 |
申请人 |
KAWAI MUSICAL INSTR MFG CO LTD |
发明人 |
RARUFU DOITSUCHIE |
分类号 |
G10H7/08;G10H7/00;G10H7/02;G10H7/06 |
主分类号 |
G10H7/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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