Music – Instruments – Electrical musical tone generation
Patent
1992-03-20
1993-09-28
Witkowski, Stanley J.
Music
Instruments
Electrical musical tone generation
84661, 84DIG19, 84DIG10, G10H 112, G10H 700
Patent
active
052488454
ABSTRACT:
An electronic music system which imitates acoustic instruments addresses the problem wherein the audio spectrum of a a recorded note is entirely shifted in pitch by transposition. The consequence of this is that unnatural formant shifts occur, resulting in the phenomenon known in the industry as "munchkinization." The present invention eliminates munchkinization, thus allowing a substantially wider transposition range for a single recording. Also, the present invention allows even shorter recordings to be used for still further memory improvements. An analysis stage separates and stores the formant and excitation components of sounds from an instrument. On playback, either the formant component or the excitation component may be manipulated.
REFERENCES:
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G. Bennett and X. Rodet, Current Directions in Computer Music Research: Synthesis of the Singing Voice MIT Press, 1989.
Markle and Gray, Linear Predictive Coding of Speech pp. 396-401, Springer-Verlag, 1976.
DigiTech Vocalist VHM5 Facts and Specs pp. 106-107, In Review, Jan., 1992.
Julius O. Smith, Techniques for Digital Filter Design and System Identification with Application to the Violin CCRMA, Department of Musics, Stanford University, Jun., 1983.
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Eberhard Zwicker and Bertram Scharf, Increasing the Audio Measurement Capability of FFT Analyzers by Microcomputer Postprocessing pp. 629-648, J. Aud. Eng. Soc., vol. 33, No. 9, Sep., 1985.
Bernard Widrow, Paul F. Titchener and Richard P. Gooch, Adaptive Design of Digital Filters pp. 243-246, Proc. IEEE Conf. Acoustic Speech Signal Processing, May 1981.
Manfred R. Schroeder and Bishnu S. Atal, Code-Excited Linear Prediction: High Quality Speech at Very Low Bit Rates ICASSP, Aug. 1985.
Ian Bowler, The Synthesis of Complex Audio Spectra by Cheating Quite a Lot Vancouver ICMC, 1985.
Massie Dana C.
Rossum David P.
E-mu Systems, Inc.
Witkowski Stanley J.
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