Electronic musical instrument with plural channels providing different phase shift

Claim 1

An electric musical instrument which comprises in combination, an audio frequency signal source; an output terminal for the audio frequency source; a plurality of parallel transmitting channels each of which comprises a delay line series circuit, a low pass filter, an amplifier and loud speaker all interconnected; said delay line series circuit connected to receive the audio frequency signal from said output terminal; a switching oscillator disposed to provide two gate pulse trains, one running in opposite phase with regard the other to the delay line series circuit; a first and a second sine shaped signal low frequency generator disposed for generating a sine shaped subaudio frequency signal to one of said switching oscillators; at least a first and a second phase shifting network each disposed to receive signals respectively from said first and second sine shaped signal low frequency generators, said first and second phase shifting networks disposed to provide a sum output signal to a second delay line series circuit; each of the further plurality of parallel transmitting channels having receiving imputs for Switching oscillators from further first and second phase shifting networks each disposed to receive signals respectively from prior disposed phase shifting networks; and a second output from the audio frequency signal source, said second output connected to the amplifier of the last of said plurality of transmitting channels.