Digital musicians telephone interface

Claim 1

A telephone interface system to interconnect the musical audio output of two or more live musicians, one or more at a first instant location and the other(s) at a second remote location over interconnected communication lines, said system at each location comprising: input means to receive said musical audio output at each of said locations and convert such audio output to analog signals; an analog-to-digital converter to receive said analog signals and convert them to digital signals; means to duplex said digital signals over said communication lines to said other location; digital-to-analog converter to receive said digital signals from said other location and convert them to analog signals; speaker means to broadcast said analog signals at each of said locations; wherein said signals from said first and second locations are transmitted at different frequencies; wherein said means to duplex said digital signals include a first and second frequency generator each producing a different carrier frequency, each digital signal imposed selectively on said carrier frequency with a different carrier frequency selected at each of said first and second locations; first and second frequency filters to filter said first location's carrier frequency from said second location's carrier frequency and vice versa; and switch means to direct selected of said frequency filters to pass one of said carrier frequencies and digital signals from one of said locations while blocking the other carrier frequencies and digital signals from said other location.