The toque background

1. outline

This device is the device that a person in charge around a child opportunity does a directions, contact, report and so on with the station staff of the parents machine.

A parents machine is installed in the signal place, the train room, and so on, and a child machine is installed around the signal.

2. characteristics and function

1. An input amplitude limitation circuit protects this device when excessive input (in such cases as the passage sound of the train) comes in from the child machine during the transmission.

2. When a voice from the child machine is too small, story volume of the parents machine is adjusted automatically.

3. A call is made of one parents machine all together in the child machine. It varies in the (circuit.)

4. Sound comes out while it telephones it in other child machines when a call is done from the child machines besides child machine's parents machine's while speaking. A parents machine can do the child machine call indication of middle others that it telephones it.

5. A telephone call distance can do the long-distance call of 1 km between the parents machine and the child machine.

6. Child machine's and telephone call person's distance can telephone it to about 3m 5m even at the time of the strong wind.

7. Operation except for the call button operation is unnecessary, and a free telephone call is made of hand in the child machine telephone call person.

8. Maintenance is easy by the control unit of the child machine by 2 circuit independence type.

9. 4 line-type noise type a low.

10. ikoraiza which can decrease line noise to speak about is built in.