| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound recording apparatus capable of performing backup recording by reliably making a microphone operate even when power supply from a transmitter to the microphone is interrupted.SOLUTION: A sound recording apparatus (a backup recording apparatus) 12 is connected between a microphone 10 and a transmitter 14. The sound recording apparatus 12 monitors an operation voltage supplied from the transmitter 14 to the microphone 10 and when the voltage is less than a threshold value, supplies an operation voltage to the microphone 10 in place of the transmitter 14. In such a situation, because a level of an audio signal changes, a gain of the audio signal is adjusted in conjunction with operation voltage supply.SELECTED DRAWING: Figure 1 |
