| 摘要 |
PROBLEM TO BE SOLVED: To separate/detect only the level of an ambient noise or only a target signal level even when the target signal sound collected by an air guide microphone is mixed with the ambient noise. SOLUTION: Signals almost containing an ambient noise collected by microphones 1, 2 positioned adjacent to the sound source of a target signal and positioned apart from the second source of the target signal are converted respectively to spectra by spectrum conversion parts 3, 4, and the frequency component excepting the target signal, or the predominant frequency component of the target signal is separated/detected respectively from a level difference of an amplitude spectrum at every frequency component, and the noise level or the target signal level are separated/detected respectively from respective spectrum intensity. |
