Multi-channel stereophonic sound reproducing system for electronic musical instruments

Claim 1

In a keyboard electronic musical instrument having tone generators for generating a plurality of tone signals each having a predetermined pitch, keyers coupling out from the tone generators a tone signal having a pitch corresponding to the depressed one of a plurality of keys arranged in the order of musical notes, and a plurality of tone coloring filters each having different frequency characteristics and supplied with the preselected ones of the tone signals derived through the keyers; a multi-channel stereophonic sound reproducing system comprising: a resistor network including a plurality of variable resistance elements each of said tone coloring filters being coupled to a variable resistance element for adjustably combining collectively output signals from the respective tone coloring filters to form composite signals; a signal separation means connected to said resistor network for separating a composite signal formed by the resistor network into a plurality of components, said separation means including a plurality of sections each including an amplifier; and a plurality of loudspeakers each connected to a respective one of said sections and receiving the preset one of the signal components obtained by the corresponding sections, whereby stereophonic musical sounds are reproduced from the combination of all the loudspeakers.