| 摘要 |
PROBLEM TO BE SOLVED: To make a received speed amplifier for telephone set capable of being automatically adapted and connected to different types of telephone set. SOLUTION: All the terminals in modular connectors 11a and 311 are selected sequentially by a connection changing portion 1001, two terminals for driving a receiver SP (speaker) are automatically detected from four terminals in total by a decision portion 1002. Automatic change is performed in correspondence with a connected telephone set body 2 by a connection setting portion 1003, so that the relations between individual input/output terminals on the side of the received speed amplifier 1 for telephone set and signals are identical. Thus, the received speech amplifier 1 for telephone set is automatically connected in correspondence with various types of telephone set.
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