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    DIAL TONE DETECTOR
    1.
    发明申请
    DIAL TONE DETECTOR 审中-公开
    拨号音检测器

    公开(公告)号：WO0223846A3

    公开(公告)日：2002-05-10

    申请号：PCT/FR0102811

    申请日：2001-09-11

    Applicant: ST MICROELECTRONICS SA ,  CHIANALE ALAIN ,  BELHI BRIGITTE

    Inventor： CHIANALE ALAIN ,  BELHI BRIGITTE

    IPC: H04L27/06 ,  H04L27/30

    CPC classification number: H04L27/30 ,  H04L27/06

    Abstract: The invention concerns a dial tone detector. Said dial tone detector comprises a synchronous filtering digital circuit for comparing the frequency of a dial tone with a reference frequency (Fref). The invention is applicable in the field of telephone communications and communications carried out via a modem.

    Abstract translation: 本发明涉及拨号音检测器。 所述拨号音检测器包括用于将拨号音的频率与参考频率（Fref）进行比较的同步滤波数字电路。 本发明适用于通过调制解调器进行的电话通信和通信领域。

    2.
    发明专利
    未知

    公开(公告)号：FR2814023A1

    公开(公告)日：2002-03-15

    申请号：FR0011582

    申请日：2000-09-12

    Applicant: ST MICROELECTRONICS SA

    Inventor： CHIANALE ALAIN ,  BELHI BRIGITTE

    IPC: H04L27/06 ,  H04L27/30 ,  H04M1/654

    Abstract: The invention concerns a dial tone detector. Said dial tone detector comprises a synchronous filtering digital circuit for comparing the frequency of a dial tone with a reference frequency (Fref). The invention is applicable in the field of telephone communications and communications carried out via a modem.

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