发明名称 |
Pitch detection apparatus and method |
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. |
申请公布号 |
US8170236(B2) |
申请公布日期 |
2012.05.01 |
申请号 |
US20090616702 |
申请日期 |
2009.11.11 |
申请人 |
KONDO TAKAYASU;KUROIWA KIYOTO;YAMAHA CORPORATION |
发明人 |
KONDO TAKAYASU;KUROIWA KIYOTO |
分类号 |
G10L25/90;H03G5/00 |
主分类号 |
G10L25/90 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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