发明公开
- 专利标题: Multifrequency tone signal detector
- 专利标题(中): Mehrfrequenz-Tondetektor。
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申请号: EP91100251.7申请日: 1991-01-09
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公开(公告)号: EP0440028A2公开(公告)日: 1991-08-07
- 发明人: Hamilton, Chris
- 申请人: DIALOGIC CORPORATION
- 申请人地址: 300 Littleton Road Parsippanny, New Jersey 07054 US
- 专利权人: DIALOGIC CORPORATION
- 当前专利权人: DIALOGIC CORPORATION
- 当前专利权人地址: 300 Littleton Road Parsippanny, New Jersey 07054 US
- 代理机构: Herrmann-Trentepohl, Werner, Dipl.-Ing.
- 优先权: US471500 19900129; US567233 19900813
- 主分类号: H04Q1/45
- IPC分类号: H04Q1/45 ; H04L27/30 ; H04Q1/46
摘要:
An MF digit or DTMF digit detector identifies MF digits or DTMF digits in a signal and eliminates talkoff as a source of false detection by analyzing the frequency spectrum of the signal which is provided by FFT and by using the history of the signal to determine whether an MF digit or a DTMF digit was simulated by a human voice.
公开/授权文献
- EP0440028A3 Multifrequency tone signal detector 公开/授权日:1992-07-22
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