| 摘要 |
PURPOSE:To send a character or the like without using an expensive MODEM by using an encoder and a decoder for a DTMF signal. CONSTITUTION:A sentence is inputted from a full keyboard 81 at the sender side, stored in a RAM 43 and when a transmission switch 52F is depressed, a contact 22 is made via a relay 23 and amplifiers 15, 36 are muted by a signal from a controller 40. When an opposite telephone number is inputted from a dial key 11, the sentence data stored in the RAM 43 is fed to the encoder 12 and converted into DTMF signals, one set by pairs according to the code table one by one character and the result is sent to a line 1. The DTMF signal is decoded by a decoder 33 at the reception side, fed to the controller 40, the character is demodulated according to the decode table, stored in the RAM 43 and fed to a display device 82 and a printer 83. |
