| 摘要 |
PURPOSE:To realize a reproduction of the signal faithful to the transmission signal, by converting the signal of the demodulated trigonometric function waveform into a triangular waveform and reproducing the triangular waveform into a binary signal. CONSTITUTION:The characters and pictures to be transmitted are converted into the binary digital signals through a photoelectric converting circuit and then into the ternary digital signals by a binary-ternary converting circuit. Furthermore the ternary signals receive a band limitation through a band limiting filter and are modulated by a modulator circuit to be transmitted to the transmission line. The signal transmitted via the transmission line is reproduced by the demodulator circuit 15; and the trigonometric function waveform d5 is transmitted and then converted into the signal f5 of a triangular waveform through the waveform limiting circuit 21. The signal f5 is converted into the binary signal e5 through the ternary-binary converting circuit 16. Then the signal e5 is changed into a hard copy by the recording circuit 17 to reproduce the characters and pictures. |
