| 摘要 |
PURPOSE:To attain interaction between a near end talker and an remote end talker by using a conventional telephone set as it is and setting adaptor with a sound coupler to the telephone set. CONSTITUTION:A 2/4-wire converter is removed from a conventional loudspeaker telephone set and instead, a sound coupler 30 is provided. The coupler 30 consists of speaker 31 and a microphone 32. In the operating state, the speaker 31 and the microphone 32 are connected respectively acoustically with the speaker 21 and the microphone 22 of the conventional telephone set 20. Then even when the speaker 11 gives a considerable sound volume, howling is suppressed. Thus, the interaction between the nearest talker and the remotest talker is attained.
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