Pitch determining voltage signal generating circuit for a voltage controlled type electronic musical instrument

Claim 1

In an electronic musical instrument comprising a keyboard circuit for producing at an output thereof a pitch determining voltage signal having a voltage representing the note of an actuated key, and a voltage controlled oscillator coupled to said keyboard circuit and responsive to the pitch determining voltage signal from the output of said keyboard circuit to generate a tone signal having a tone pitch which is a function of the pitch determining voltage signal, said keyboard circuit comprising: a DC voltage source; a voltage dividing network including a plurality of first resistors which are series connected and have a substantially equal resistance value, one end of the series-connection of said first resistors being connected to said output of said keyboard circuit, a second resistor connecting said output of said keyboard circuit to a reference potential point, and a plurality of third resistors connecting respective junctions between two adjacent series-connected first resistors to the reference potential point, said third resistors each having a substantially equal resistance value; and a plurality of key switches respectively connected between said DC voltage source and (i) each of said junctions and (ii) both ends of said series connection of said first resistors.