发明名称 |
Microphone device and audio player |
摘要 |
A signal generating section generates a main signal and a noise reference signal. A determining section determines whether a level ratio is larger than a predetermined value. An adaptive filter section generates a signal indicative of a signal component of a target sound included in the noise reference signal generated by the signal generating section, and learns a filter coefficient only when the determining section determines that the level ratio is larger than the predetermined value. A subtracting section subtracts the signal generated by the adaptive filter section from the noise reference signal. A noise suppressing section suppresses a signal component of noise included in the main signal by using the main signal and the noise reference signal after subtraction by the subtracting section.
|
申请公布号 |
US2004185804(A1) |
申请公布日期 |
2004.09.23 |
申请号 |
US20030714857 |
申请日期 |
2003.11.18 |
申请人 |
KANAMORI TAKEO;KAWAMURA TAKASHI;MATSUOKA TOMOMI |
发明人 |
KANAMORI TAKEO;KAWAMURA TAKASHI;MATSUOKA TOMOMI |
分类号 |
H04R3/00;(IPC1-7):H04B1/04 |
主分类号 |
H04R3/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|