| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve the problem of a conventional telephone recording adaptor wherein wariness of causing a sense of discomfort to a speech opposite party and arousing suspicion of a fact of recording speech contents to the speech opposite party persists because a voice electric signal picked up from a telephone set is outputted to a recorder without any modification and the earth line of the adaptor is common to a voice electric signal line of the telephone set resulting in that a noise of the recorder is intruded to a telephone line through the adaptor. <P>SOLUTION: This adaptor for picking up the voice electric signal from the telephone set and outputting the signal to the recorder is provided with a photocoupler 9 wherein a light emitting element 10 for converting the voice electric signal picked up from the telephone set into an optical signal and a light receiving element 11 for converting the optical signal again into a voice electric signal and outputting the signal to the recorder are assembled into a package case 12 so as to electrically isolate the telephone set from the recorder thereby preventing the noise coming from the recorder from being intruded into the telephone line. <P>COPYRIGHT: (C)2004,JPO</p> |
