Electronic musical instrument including waveshape memory and modifiable address control
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United States of America Patent
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Jun 7, 1988
Issued Date -
N/A
app pub date -
Jun 25, 1985
filing date -
Jul 3, 1975
priority date (Note) -
Expired
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Abstract
In this electronic musical instrument a musical tone is generated by repetitively reading out a waveshape stored in a memory. Repetitive sets of phase information are produced, such phase information thus being a linear saw-tooth-like digital signal having a repetition period corresponding to the frequency of the generated musical tone. Phase distorting means modifies the shape of the phase information so as to distort said linear saw-tooth-like signal, without changing the repetition period thereof. The resultant altered phase information is used to access said memory so that during the supply of each of said repetitive sets, successive samples in different portions of said stored waveshape respectively are read out at different effective rates. Thus the waveshape samples read out from said memory will consitiute a musical tone having changed tone color but unchanged pitch.
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