ANALOG TRANSMISSION SYSTEM FOR GRAPHIC INFORMATION

摘要

PURPOSE:To send a graphic in real time by modulating a signal representing position information of a graphic in terms of a analog, sending it through a telephone line and eliminating a signal of a frequency band of a carrier used for analog modulation. CONSTITUTION:A graphic input device 1 outputting a signal representing the position information of the inputted graphic a modulator 9 analog modulating the output signal of the device 1 are provided to the transmission side of the telephone line, a demodulator 17 demodulating a modulation signal subjected to analog modulation and outputting a signal representing the position information and a graphic output device 33 outputting a graphic based on the output signal of the demodulator 17 are provided to the reception side. Then filters 13, 14 rejecting a signal of the frequency band of the carrier used for the analog modulation are provided to the handset of the sender and reception side. Thus the graphic is sent in real time through the telephone line and the transmission of graphic and the communication are applied at the same time.