| 摘要 |
PROBLEM TO BE SOLVED: To provide a microphone or the like that is capable of improving bone-conduction sound without depending on a speaker and utterance contents or the like, and without requiring prediction of noise and complicated calculation or the like. SOLUTION: The microphone has a bone-conduction mike for collecting the bone-conduction sound, an air-conduction mike for collecting air-conduction sound; a transversal filter circuit 18 which filters a bone-conduction sound signal x(n) inputted from the bone-conduction mike so as to output it as a derivation sound signal y(n); and a filter coefficient adjustment part 22 which outputs a difference between the derivation sound signal y(n) inputted from the transversal filter circuit 18 and an air-conduction sound signal d(n) inputted as a desired signal from the air-conduction mike as an error signal e(n) in order to update a filter coefficient, so that the error signal e(n) inputted from an adder 20 is reduced. It is possible to output the bone-conduction sound signal x(n) correlated with the air-conduction sound signal d(n) as the derivation sound signal y(n). COPYRIGHT: (C)2007,JPO&INPIT |
