| 摘要 |
PURPOSE:To make a tone ringer exclusive IC, etc. unnecessary, to decrease the number of parts, and to obtain an inexpensive tone ringer telephone set by sounding a ringer tone by controlling a ringer tone sounding means in case of an on-hook state, and controlling to send out a dial, etc. without sounding the ringer tone in case of an off-hook state. CONSTITUTION:In case a ringing signal comes in an on-hook state and a microcomputer 28 is started, a level of a connecting point A of a resistance 27 and a contact 22b is a high level since the contact 22b is open, and the microcomputer 28 decides an on-hook by deciding it by inputting the level of this A point through an input part 28b. Accordingly, it is shifted to a step 26, outputs a ringer sound output from an output part 28a, and sounds a sounding body 33. In case of an off-hook state, a contact 22c is also closed, therefore, a speech network 30 also becomes an active state. In this state, a DC loop is intermitted so as to send out a dial pulse corresponding to a push-button dial inputted by controlling a dial pulse circuit 29. |
