发明名称 |
Sound determination device, sound detection device, and sound determination method for determining frequency signals of a to-be-extracted sound included in a mixed sound |
摘要 |
A sound determination device (100) includes: an FFT unit (2402) which receives a mixed sound including a to-be-extracted sound and a noise, and obtains a frequency signal of the mixed sound for each of a plurality of times included in a predetermined duration; and a to-be-extracted sound determination unit (101 (j)) which determines, when the number of the frequency signals at the plurality of times included in the predetermined duration is equal to or larger than a first threshold value and a phase distance between the frequency signals out of the frequency signals at the plurality of times is equal to or smaller than a second threshold value, each of the frequency signals with the phase distance as a frequency signal of the to-be-extracted sound. The phase distance is a distance between phases of the frequency signals when a phase of a frequency signal at a time t is ψ(t) (radian) and the phase is represented by ψ′(t)=mod 2&pgr;(ψ(t)−2&pgr;ft) (where f is an analysis-target frequency).
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申请公布号 |
US8352274(B2) |
申请公布日期 |
2013.01.08 |
申请号 |
US20080517388 |
申请日期 |
2008.08.25 |
申请人 |
PANASONIC CORPORATION;YOSHIZAWA SHINICHI;NAKATOH YOSHIHISA |
发明人 |
YOSHIZAWA SHINICHI;NAKATOH YOSHIHISA |
分类号 |
G10L0011/000000 |
主分类号 |
G10L0011/000000 |
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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