Music – Instruments
Patent
1978-03-30
1980-07-15
Witkowski, S. J.
Music
Instruments
84 113, G10H 102, G10H 500
Patent
active
042122210
ABSTRACT:
The present invention is a two-part apparatus for producing note attack and decay in a conventional electronic musical instrument. Either part of the invention may be used independently of the other; however, at present the combined use is preferred. In part one, there is provided an eight state counter clocked at a rate equal to the note generator cycle and a digital magnitude comparator. The inputs (A) from the eight state counter are compared to the attack and decay scale factor inputs (B) by the comparator. The A>B,A=B functions are generated by the comparator in combination with an OR gate. The OR gate output and the sample gating signal from the conventional musical instrument are applied to an AND gate which outputs a modulated sample gating signal. In part two, the modulated sample gating signal of part one is subpulsed individually by two subpulses. Through the use of gating techniques, the most significant bit of the attack and decay scale factor is used to combine the modulated sample gating signal with the first of the two subpulses. Upon reaching the maximum pulse frequency with the first subpulse, the most significant bit of the attack and decay scale factor forces the continued maximum frequency output of the first subpulse and begins a second combination using the second of the two subpulses. The second output is combined with the first through OR gating which results in a signal with both sample period and pulse width modulation.
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patent: 3819844 (1974-06-01), Isii
patent: 4014238 (1977-03-01), Southard
patent: 4026179 (1977-05-01), Futamase
patent: 4033219 (1977-07-01), Deutsch
patent: 4079650 (1978-03-01), Deutsch et al.
patent: 4108036 (1978-08-01), Slaymaker
patent: 4114495 (1978-09-01), Tomisawa
patent: 4119006 (1978-10-01), Whitefield
patent: 4128032 (1978-12-01), Wada et al.
patent: 4144787 (1979-03-01), Robinson et al.
Allen Organ Company
Witkowski S. J.
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