Music – Instruments
Patent
1979-07-19
1981-03-17
Truhe, J. V.
Music
Instruments
84 122, G10H 100
Patent
active
042560039
ABSTRACT:
In a musical instrument in which a plurality of data words corresponding to the amplitudes of a corresponding number of evenly spaced points defined a cycle of an audio waveform are transformed at an average rate proportional to the pitch of the tone being generated, a frequency generator is provided using a single master clock source for selectively producing the entire range of musical notes. A non-integer frequency generator is implemented which periodically adds a frequency number, corresponding to an actuated keyswitch, to itself in an adder-accumulator. Overflow pulses from the adder-accumulator address out a set of waveshape values stored in a memory. The noise produced by the unequally spaced overflow pulses is reduced by applying optimal amplitude weighting values to the output waveshape values and then adding the weighted values to provide a single value which is converted to an analog signal and furnished as the musical signal.
REFERENCES:
patent: 3639913 (1972-02-01), Watson
patent: 3743755 (1973-07-01), Watson
patent: 4020332 (1977-04-01), Crochiere et al.
patent: 4036096 (1977-07-01), Tomisawa
patent: 4085644 (1978-04-01), Deutsch et al.
patent: 4114496 (1978-09-01), Deutsch
Deutsch Ralph
Isen Forester W.
Kawai Musical Instrument Mfg. Co. Ltd.
Truhe J. V.
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