The block of an integrated circuit to provide and oitavamente tonalizing notes relating to an electric musical instrument.

摘要

A bright wave (all harmonic wave) organ system which has direct current (D.C.) keying for all notes, both manual and pedal, and also provides sine wave (flute) notes by filtration. All-harmonic waves are provided by stairstepping octavely related square waves and the flutes by filtration of the complex stairstepped wave minus the square wave component which has its fundamental at twice the frequency of the desired flute note to accommodate octave flute filtering. The present arrangement is such that one integrated circuit package provides for two octavely related groups of adjacent notes, all C's and all C &musics& 's, for instance, for eight octaves of manual notes and three octaves of 16-, 8- and 4-foot pedal notes or the equivalent. Each circuit package requires only one musical frequency input or clock for each of two adjacent note groups, one for C and one for C &musics& for instance. The integrated circuit packages are large scale integrations (LSI) and include the frequency dividers, the arrangement for keying and stairstepping the square waves, for collecting and controlling the outputs for octave or half octave sine wave filtration and for formanting, and for providing three pedal outputs, one each for the 16-foot, 8-foot and 4-foot pedal notes or the equivalent for other use. Provision is made for phase synchronization of the frequency dividers.