Music – Instruments
Patent
1976-08-30
1978-08-01
Schaefer, Robert K.
Music
Instruments
G10H 102
Patent
active
041035810
ABSTRACT:
A keyboard operated tone synthesizer with portamento effect in which each key controls the pitch of the generated tone through a table of frequency numbers, each key selecting a corresponding frequency control number from the table and converting this number to an analog voltage which is applied to a voltage controlled oscillator, the oscillator in turn controlling the pitch of the associated tone generated by the synthesizer. The portamento effect of having the pitch of one note slide smoothly into the pitch of the next note is achieved by subtracting the frequency number of a new note to be generated from the frequency number controlling the frequency of the note currently being generated. A fraction of the difference is stored in an increment register and added over and over to the frequency number of the current note at a controlled rate until the frequency control number equals the frequency control number of the new note. Thus the transition from one note to the other takes place in a fixed number of incremental steps, the transition time being independent of the difference in pitch between the two successive notes.
REFERENCES:
patent: 3898905 (1975-08-01), Schreier
patent: 3906830 (1975-09-01), Mathias
patent: 3929053 (1975-12-01), Deutsch
patent: 3952623 (1976-04-01), Deutsch
patent: 3979996 (1976-09-01), Tomisawa et al.
patent: 4016792 (1977-04-01), Schrecongost
Kawaii Musical Instrument Mfg. Co.
Miska Jit W.
Schaefer Robert K.
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