| 摘要 |
A voice transmitter includes a first selector for selecting an output of DTMF encoding means or that of voice-DTMF encoding means; DTMF transmission control means for monitoring each state, and for controlling selecting operation of the first selector; DTMF detecting means; and a second selector for selecting an output of voice encoding means or an output signal selected by the first selector by the DTMF detecting means.
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