(under the class definition) Subject matter wherein the transmission system, transmitter, or receiver may be altered to alternately send either digital or analog information.
(1) Note. Systems or elements that simultaneously convey analog and digital information are not in this class but in Class 370, Multiplex. Systems wherein the digital data is the address signal for the analog message are not here but in Class 455, subclasses 31.1+; and Class 340, subclasses 825+.
