| 摘要 |
PROBLEM TO BE SOLVED: To prevent a recording level of other channel from being affected by one channel by providing a gain adjustment means that adjusts independently a gain of two channels respectively to a stereo recording device. SOLUTION: An L channel system (shown in upper side in figure) and an R channel system (shown in lower side in figure) are configured independently and they are provided respectively with feedback circuits 6L, 6R. An input picked up by a microphone 1L (1R) is amplified by an amplifier 2L (2R) and given to an A/D converter circuit 4L (4R) via an electronic volume 3L (3R), in which the signal is converted into digital data and they are fed to a recording circuit (not shown). Furthermore, a peak detection circuit 5L (5R) detects a peak level within a prescribed time and the level is fed to a feedback circuit 6L (6R). The electronic volume 3L (3R) is variably controlled by an output of the feedback circuit 6L (6R). Thus, a disadvantage such that a voice of an utterance party close to other microphone is hardly heard by a voice or the like of another utterance party close to one microphone is avoided. |
