| 摘要 |
PURPOSE:To easily attach a mischief preventing function on a general telephone set, by providing a voice code decoder and a memory on a handset. CONSTITUTION:Usually, a switch 16 is pulled down to a usual side, and the handset is operated as a general handset. Next, at the time of sound recording, the switch 16 is permitted be pulled down to either side, and a reception signal sent from a telephone set main body is sent to a receiver 11 via a connector 13, and also, it is inputted to the voice code decoder 14, then being encoded to a digital signal, and is stored in the memory 15. Furthermore, at the time of reproduction, the switch 16 is pulled down to a reproduction side, and a voice signal encoded to the digital signal in the memory 15 is decoded to an analog signal at the voice code decoder 14, and is outputted to a transmission side. In such way, it is possible to attach the mischief preventing function on the telephone set only by providing the switch 16 which switches a usual state and a reproduction state, and exchanging the handset. |
