| 摘要 |
PROBLEM TO BE SOLVED: To adjust a sound volume of a necessary sound source and a sound volume of an unnecessary sound source with a sufficient balance. SOLUTION: A sound source separating section 11 separates and extracts as the first to n-th unit acoustic signals from the first to n-th sound sources which are located in the first to n-th directions from detection signals of plural microphones. A sound kind detection part 12 detects a kind of a corresponding sound source every unit acoustic signal. For example, each sound source detects any of a people's voice, a music or a noise. A sound volume detection part 13 divides a band of the unit acoustic signals into the first to eighth sub bands, and detects a signal level of the unit acoustic signal every sub band. A sound volume control decision part 14 and a sound volume control part 15 consider sound sources located before and behind a sound recorder as the necessary sound source and the unnecessary sound source, and adjust the sound volume of each sound source by deciding an amplification amount every unit acoustic signal and every sub band and by performing a signal amplification of the unit acoustic signal based on the first to n-th directions and detection results of the sound kind detection part 12 and the sound volume detection part 13. COPYRIGHT: (C)2010,JPO&INPIT |
