Tone selector circuit with multiplexed tone data transfer

Abstract

An electric organ utilizes digital encoding and time division multiplexing to both transfer function selection and note selection information from manually operable switches to respective memories, and to simultaneously produce a plurality of tone signals corresponding to stored note selection information. A single encoding circuit during successive scanning periods established by a single multiplexing circuit encodes in binary form the function and note selection information. A plurality of stored note codes are transferred on a time division multiplexing basis to a note selector which selectively produces in multiplexed form on one output all of the tone signals. These tone signals are demultiplexed to generate a corresponding plurality of tone signal outputs. An octave selection circuit responsive to a part of each note code selectively reduces the frequency of the demultiplexed tone signals. In response to storage of the code for a memory function, the note code memory operates to maintain note codes in storage after deactuation of the switches corresponding thereto until automatically updated with new note codes in response to selection of a new set of notes.