| 摘要 |
PROBLEM TO BE SOLVED: To provide a wind noise detecting signal having high accuracy in detection by using not only a difference signal of two or more sound collecting means but a summation signal thereof as an information source for detecting the wind noise, and reducing incorrect determination even when the sound pressure level of the acoustic wave is high. SOLUTION: A difference signal (L-R) is generated by a difference signal generator 8 from signals (L), (R) detected by two microphones, and a summation signal (L+R) is generated by a summation signal generator 9. Each signal is passed through low-pass filters 10, 12 and changed into each modulus by modulus detectors 11, 13. In a wind noise detecting signal generator 14, the modulus of the summation signal (L+R) is subtracted from the modulus of the difference signal (L-R) and the result is generated to a system control unit 7. In this case, 0 is generated if the resulted value is smaller than 0. COPYRIGHT: (C)2005,JPO&NCIPI
|
