Claims
- 1. An electronic musical instrument, comprising:
- storage means for storing waveform information;
- address signal production means for producing a single address signal which changes at a uniform rate corresponding to a frequency of the waveform to be produced over one cycle of a waveform, to read out the waveform information stored in said storage means;
- modulating signal production means for producing a modulating signal;
- modification means coupled to said address signal production means and to said modulating signal production means for modifying the single address signal produced from said address signal producing means, into a modified address signal according to the modulating signal supplied from said modulating signal production means without using a feedback loop from said storage means, the changing rate of said modified address signal varying in one cycle of the waveform; and
- accessing means coupled to said modification means for accessing said storage means by the use of the modified address signal delivered from said modification means to generate a waveform signal which has a distorted waveform according to the modulating signal produced by the modulating signal production means, and has the frequency determined by the single address signal generated by the address signal production means.
- 2. An electronic musical instrument according to claim 1, wherein said modulating signal production means produces a modulating signal which changes with the lapse of time.
- 3. An electronic musical instrument according to claim 1, wherein said address signal production means delivers at the uniform rate, phase angle information which defines a phase angle of the waveform.
- 4. An electronic musical instrument according to claim 1, wherein said storage means stores sine waves as the waveform information.
- 5. An electronic musical instrument, comprising:
- storage means for storing waveform information;
- address signal production means for producing a single address signal in real time which changes at a uniform rate corresponding to a frequency of the waveform to be produced over one cycle of a waveform, to read out the waveform information stored in said storage means;
- modulating signal production means for producing a modulating signal in real time without accessing the storage means;
- modification means coupled to said address signal production means and to said modulating signal production means for modifying the single address signal produced from said address signal production means, into a modified address signal according to the modulating signal supplied from said modulating signal production means without using a feedback loop from said storage means the changing rate of said modified address signal varying in said one cycle of the waveform; and
- accessing means coupled to said modification means for accessing said storage means by the use of the modified address signal delivered from said modification means to generate a waveform signal which has a distorted waveform according to the modulating signal produced by the modulating signal production means, and has the frequency determined by the single address signal generated by the address signal production means.
- 6. An electronic musical instrument, comprising:
- storage means for storing waveform information;
- address signal production means for producing a single address signal which changes at a uniform rate corresponding to a frequency of the waveform to be produced over one cycle of a waveform, to read out the waveform information stored in said storage means;
- modulating signal production means for producing a modulating signal of non-sinusoidal form;
- modification means coupled to said address signal production means and to said modulating signal production means for modifying the single address signal produced from said address signal production means, into a modified address signal according to the modulating signal supplied from said modulating signal production means without using a feedback loop from said storage means the changing rate of said modified address signal varying in said one cycle of the waveform; and
- accessing means coupled to said modification means for accessing said storage means by the use of the modified address signal delivered from said modification means to generate a waveform signal which has a distorted waveform according to the modulating signal produced by the modulating signal production means, and has the frequency determined by the single address signal generated by the address signal production means.
Priority Claims (2)
Number |
Date |
Country |
Kind |
50-82208 |
Jul 1975 |
JPX |
|
50-82209 |
Jul 1975 |
JPX |
|
RELATED APPLICATIONS
This application is a division of my copending U.S. patent application Ser. No. 06/748,732, filed Jun. 25, 1985, now U.S. Pat. No. 4,748,888, which is a division of U.S. patent application Ser. No. 05/922,883, filed Jul. 7, 1978, now U.S. Pat. No. 4,643,066 which itself is a continuation of my U.S. patent application Ser. No. 05/700,941, filed Jun. 29, 1976, now abandoned.
US Referenced Citations (5)
Non-Patent Literature Citations (3)
Entry |
Albert G. Fadell, Calculus with Analytic Geometry, copyright .COPYRGT. 1964, by D. Van Nostrand Company, Inc., Princeton, N.J., Library of Congress Catalog Card No. 64-17960, pp. 53-55. |
"The Synthesis of Complex Audio Spectra by Means of Frequency Modulation" by John M. Chowning, Journal of the Audio Engineering Society, Sep. 1973, vol. 21, No. 7, pp. 526-534. |
Max V. Mathews, The Technology of Computer Music, the MIT Press, 1969, pp. 115-120, 126-138. |
Divisions (2)
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Number |
Date |
Country |
Parent |
748732 |
Jun 1985 |
|
Parent |
922883 |
Jul 1978 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
700941 |
Jun 1976 |
|