| 摘要 |
PURPOSE:To attain automatic dialing in matching with the line of the dialing type by providing both a push dial driving section and a pulse dial driving section, allowing one of the dial driving section to dial some digits of a telephone number, and detecting the incoming of the dial tone from an exchange. CONSTITUTION:A handset of a telephone set is hooked off and a dial start switch 12 is depressed at first. Then a microcomputer 11 turns on a transistor 2c and an inputted dial tone is inputted to a dial tone detecting means 3. Further, only the first 2-digit of a telephone number is outputted to the push dial driving means 1 for attaining dialing. Whether or not the line is a telephone line of the push dial line is decided depending whether a dial tone is inputted to the detecting means 3 or not. Each dial driving section is driven based on the result of decision thereby attaining dialing. |
