发明授权
- 专利标题: Pitch detection apparatus and method
- 专利标题(中): 间距检测装置及方法
-
申请号: US12616702申请日: 2009-11-11
-
公开(公告)号: US08170236B2公开(公告)日: 2012-05-01
- 发明人: Takayasu Kondo , Kiyoto Kuroiwa
- 申请人: Takayasu Kondo , Kiyoto Kuroiwa
- 申请人地址: JP Hamamatsu-shi
- 专利权人: Yamaha Corporation
- 当前专利权人: Yamaha Corporation
- 当前专利权人地址: JP Hamamatsu-shi
- 代理机构: Morrison & Foerster LLP
- 优先权: JP2008-289974 20081112
- 主分类号: H03G5/00
- IPC分类号: H03G5/00
摘要:
Band-pass filter suppresses frequency components of a sound signal that are lower than a low-side cutoff frequency and that are higher than a high-side cutoff frequency. Pitch detection section detects a pitch of the sound signal having been processed by the band-pass filter. Target setting section variably sets a low-side target value lower than the pitch detected by the pitch detection section and a high-side target value higher than the detected pitch. Filter control section causes the low-side cutoff frequency to approach the low-side target value over time and causes the high-side cutoff frequency to approach the high-side target value over time. In this way, a pass band of the band-pass filter can be smoothly variably controlled in accordance with pitch change of the sound signal that is an object of pitch detection.
公开/授权文献
- US20100119082A1 Pitch Detection Apparatus and Method 公开/授权日:2010-05-13