Music – Instruments
Patent
1979-11-19
1981-06-02
Witkowski, S. J.
Music
Instruments
84 124, G10H 108, G10H 500
Patent
active
042704308
ABSTRACT:
In an electronic musical instrument apparatus is provided for producing a noise-like signal suitable for a variety of musical effect such as the imitation of percussive musical instruments. A noise master data set is created repetitively and independently of tone generation by computing a Fourier algorithm using random values for the Fourier coefficients. The noise master data set is transferred to a noise tone register whose output is sequentially and repetitively read and converted to an analog noise signal. Formant circuitry is used to vary the noise signal's spectrum in a time variant manner and the frequency of an assigned variable frequency clock can be used to vary the spectral bandwidth of the output noise signal.
REFERENCES:
patent: 3247309 (1966-04-01), Campbell
patent: 3794748 (1974-02-01), Deutsch
patent: 4022098 (1977-05-01), Deutsch et al.
patent: 4026180 (1977-05-01), Tomisawa et al.
patent: 4067254 (1978-01-01), Deutsch et al.
patent: 4085644 (1978-04-01), Deutsch et al.
patent: 4194427 (1980-03-01), Deutsch
D. B. Keele, Jr., "The Design and Use of a Simple Pseudo Random Pink-Noise Generator", J. Audio Engineering Society, vol. 21, (Jan./Feb., 1973), pp. 33-41.
Deutsch Ralph
Kawai Musical Instrument Mfg. Co. Ltd.
Witkowski S. J.
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