Electronic musical instrument with automatic performance device

An electronic musical instrument comprising:

• keys;
• note information generation means for generating information of a plurality of notes which are in predetermined note interval relations to a root note selected by depression of said keys;
• and
• selection means for selecting information of a desired note among the information of the plurality of notes generated by said note information generation means at desired time intervals;
• tones corresponding to the selected information being thereby produced;
• and wherein
• said note information generation means stores data representing a plurality of note intervals corresponding to a desired type of chord at predetermined memory positions in a shift register in order of the note intervals and includes means for providing the note information by shifting the respective data until the stored prime interval indicative datum for said chord type is situated at a certain memory position corresponding to said selected root note.

An electronic musical instrument comprising:

• keys;
• processing means for carrying out one or more processes selected from the group including chord detection, root tone detection and single-tone selection according to note information specified by depression of said keys, and in response to control information;
• and
• control means for supplying to said processing means control information required for carrying out a plurality of automatic performances such as an automatic bass chord performance and an automatic arpeggio performance, in a time division manner, with respect to each function of said automatic performances,
• processing for said plurality of automatic performances being thereby effected in a time division manner in said processing means.

In an electronic musical instrument, an arpeggio production system comprising:

• a data register having a separate storage position corresponding to each note name,
• chord data entry means for entering into said data register subtone degree data indicative of the prime and intervals of a chord, the prime-indicative datum being entered in the storage position corresponding to the note name of the chord root,
• an "arpeggio" register also having a separate storage position corresponding to each note name and storing a single signal in the storage position corresponding to the note name of the last produced arpeggio tone, and
• masking type priority selection means, cooperating with said data register and said "arpeggio" register, for comparing the contents of said data register and said "arpeggio" register and for selecting the interval indicative datum in said data register which is next in preselected order with respect to the note name of said last produced arpeggio tone, said selected datum being usable to control production of the next arpeggio tone.

In an electronic musical instrument, an automatic bass chord performance device comprising:

• a data register having a separate storage position corresponding to each note name,
• means for entering data into said data register in those storage positions corresponding to the names of selected notes,
• chord detect logic means for circulating said entered data in said data register and for terminating said circulation upon detection of a chord type represented by said circulated data with the prime of said chord at a specified position in said data register,
• shifting means for shifting the data in said data register without recirculation until the total number of positions said data was circulated and shifted corresponds to the number of storage positions in said data register, whereby the root of said chord is represented by the position of the stored datum nearest one extremity of said data register, and
• priority gating means for extracting said root indicative datum from said data register.