发明名称 |
Tone detection |
摘要 |
A DFT is used to compute the magnitude and phase of the frequencies desired to be detected in a frame of sampled data by performing 2 dot products for each such frequency. The two dot products are calculated using the samples in the frame and an equal number of equally spaced cosine and sine coefficients for each frequency to be detected.
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申请公布号 |
US6914979(B2) |
申请公布日期 |
2005.07.05 |
申请号 |
US20010841938 |
申请日期 |
2001.04.25 |
申请人 |
ADAPTIVE DIGITAL TECHNOLOGIES, INC. |
发明人 |
KURTZ SCOTT DAVID;MCCARTHY, SR. BRIAN MICHAEL |
分类号 |
H04M3/00;(IPC1-7):H04M1/00 |
主分类号 |
H04M3/00 |
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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