| 摘要 |
PROBLEM TO BE SOLVED: To provide a recording adapter which corresponds to a fixed telephone without sidetone and can obtain a recording signal at the level appropriate for transmission/reception.SOLUTION: In a recording adapter, by receiving power supply from equipment having a recording function, a transmission signal is amplified by an amplifier circuit 10 and the transmission signal and a reception signal are mixed by a mixing circuit 30. Thus, signal level adjustment is possible in a wide range with respect to a setting condition of an unspecified recorder. Since level adjustment of the reception signal and the transmission signal is performed by a reception level adjustment circuit 2 and a transmission level adjustment circuit 22 respectively, a signal at the level appropriate for speech recording can be outputted. Also, since the transmission signal is obtained by an electret microphone which performs sound collection of sound field of a caller, it is possible to record the caller's sound field at an appropriate level even with a fixed telephone without sidetone. |
