无锡电讯设备总厂最近试制成功了LDH系列共八个品种的录音电话机。该机主要由盒式磁带录音和普通电话两部分组成。录音部分备有盒式磁带和一条循环磁带,循环带根据需要,预先录制好讲话内容,如“这里没有人,是录音电话在工作,有话请讲”。当有电话信号无人受话时,电话机内的时间继电器会自动打开录音部分,循环 Wuxi Telecommunication Equipment Factory recently successfully produced a total of eight varieties of LDH series recording telephone. The machine is mainly composed of cassette tape recorder and ordinary telephone. The recording part is equipped with a tape cassette and a recycle tape. The recycle tape pre-records the contents of the speech according to the need. For example, "There is no one here. The recording phone is working. When there is no signal when the phone call, the phone’s time relay will automatically open the recording part of the cycle