Abstract: A method of transmitting multiple synchronized multiplex data frames which, by individual selection and control of specific bit valves performance of individual subchannels may be altered including the steps of inputting data from a plurality of sources simultaneously into a plurality of multiplexers to provide as an output of each multiplexer composite data signals, synchronizing the composite data signals simultaneously received from the plurality of multiplexers in a multiplex controller, encoding the synchronized composite data signal into a Gray code format, applying the coded format data stream to a digital-to-analog converter, modulating a carrier signal with the analog signal output of the converter and transmitting the frequency modulated carrier signals by a transmission system.

Abstract: A method and apparatus for transmitting and receiving a carrier signal which is simultaneously frequency and phase modulated, including a carrier signal, a frequency modulator for imposing on the carrier signal an analog information signal, a bi-phase shift key modulator for modulating the frequency modulated carrier with a digital information signal to provide an output frequency and phase modulated carrier signal, a receiving system including a multiplier by which the received composite signal is multiplied by two to cancel out the bi-phase modulation and thereby derive a frequency modulated only signal, demodulating the multiplied frequency modulated signal utilizing a frequency demodulation network and comparing the derived frequency modulated signal with the received transmitted signal to derive the digital information signal.