| 摘要 |
PROBLEM TO BE SOLVED: To provide a booming noise reduction device capable of sufficiently reducing a booming noise in the external auditory meatus which is uncomfortable for a user while preventing oscillation which becomes a problem in the case of performing negative feedback by using a microphone for the external auditory meatus.SOLUTION: A booming noise reduction device includes: a receiver 4; a microphone 5 for the external auditory meatus; negative feedback circuits 40 and 41; and a signal bypass part 42. A signal Sout is converted into a sound by the receiver 4, and output to the inside of the external auditory meatus, and the sound and a booming noise are both converted into an electric signal by the microphone 5 for the external auditory meatus, and output to a negative feedback path. On the negative feedback path, predetermined frequency components are subjected to negative feedback via a low-band inverting amplification part 40 to a transmission path. A signal bypass part 42 functions as a bypass path from the input side of the receiver 4 to the output side of the microphone 5 for the external auditory meatus, and signal components whose phase change is small are transmitted via the signal bypass path 42. Thus, it is possible to sufficiently reduce the frequency components of the booming noise while preventing oscillation in a predetermined frequency. |
