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8 条记录 (耗时 0.019 秒)

    Speech detection apparatus not affected by input energy or background noise levels
    1.
    发明授权
    Speech detection apparatus not affected by input energy or background noise levels 失效
    语音检测设备不受输入能量或背景噪声水平的影响

    公开(公告)号：US5293588A

    公开(公告)日：1994-03-08

    申请号：US682079

    申请日：1991-04-09

    申请人： Hideki Satoh ,  Tsuneo Nitta

    发明人： Hideki Satoh ,  Tsuneo Nitta

    IPC分类号： G10L25/78 ,  G10L9/00

    CPC分类号： G10L25/78

    摘要： A speech detection apparatus capable of reliably detecting speech segments in audio signals regardless of the levels of input audio signals and background noises. In the apparatus, a parameter of input audio signals is calculated frame by frame, and then compared with a threshold in order to judge each input frame as one of a speech segment and a noise segment, while the parameters of the input frames judged as the noise segments are stored in the buffer and the threshold is updated according to the parameters stored in the buffer. The apparatus may utilize a transformed parameter obtained from the parameter, in which the difference between speech and noise is emphasized, and noise standard patterns are constructed from the parameters of the input frames pre-estimated as noise segments.

    摘要翻译： 一种能够可靠地检测音频信号中的语音段的语音检测装置，而不管输入音频信号的电平和背景噪声如何。 在装置中，逐帧地计算输入音频信号的参数，然后与阈值进行比较，以便将每个输入帧判断为语音段和噪声段之一，而将输入帧的参数判断为 噪声段被存储在缓冲器中，并且根据存储在缓冲器中的参数来更新阈值。 该装置可以利用从参数获得的变换参数，其中强调语音和噪声之间的差异，并且根据预估为噪声段的输入帧的参数构建噪声标准模式。

    Optical transmission device and optical transmission system using the same
    8.
    发明授权
    Optical transmission device and optical transmission system using the same 有权

    公开(公告)号：US07031620B2

    公开(公告)日：2006-04-18

    申请号：US09905045

    申请日：2001-07-12

    申请人： Shigeru Tokita ,  Mitsuo Akashi ,  Naohiko Baba ,  Yoichi Honzawa ,  Hideki Satoh

    发明人： Shigeru Tokita ,  Mitsuo Akashi ,  Naohiko Baba ,  Yoichi Honzawa ,  Hideki Satoh

    IPC分类号： H04B10/04

    CPC分类号： H04B10/2587

    摘要： An optical transmission system includes a current source for outputting a drive current, a semiconductor laser for converting the drive current into a stimulated emission light and producing the same, a drive circuit for converting a transmission data signal into a modulation control signal and outputting the same, an optical modulator for receiving the stimulated emission light and a shading control signal for interrupting light emission and producing and outputting transmission signal light by changing an amount of transmission of the stimulated emission light according to the shading control signal, and a shading element for receiving the transmission signal light and a shading control signal for interrupting light emission and interrupting the transmission of the transmission signal light according to the shading control signal whereby an optical signal having wrong optical wavelength is rapidly prevented.