Method and apparatus for transferring digital data

Abstract From the Canadian patent

A digital data transfer system for performing a transfer of data between a personal computer and an audio cassette tape recorder, wherein a modulation circuit for producing signals to be recorded in the recorder comprises a clock generator, a ternary counter a, binary counter, a delay circuit, an AND gate and an exclusive-OR gate, while a demodulation circuit for supplying signals read out from the recorder to the, personal computer comprises a rising edge detecting circuit, a falling edge detecting circuit an OR gate, a gate pulse generator, an AND gate a binary counter, a exclusive-OR gate, a delay circuit and a P-type, flip-flop.