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1. 发明申请

WO1998025340A1 AUTOMATIC DYNAMIC RANGE CONTROLLING CIRCUIT 审中-公开
标题翻译：自动动态范围控制电路
公开(公告)号：WO1998025340A1
公开(公告)日：1998-06-11
申请号：PCT/JP1997004457
申请日：1997-12-05
申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION , NTT ELECTRONICS CORPORATION , ASAHI KASEI MICROSYSTEMS CO., LTD. , HOSHINO, Toshio , DAIKOKU, Kazuhiro , YAMADA, Kenji , TAKASAKI, Tomokazu
发明人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION , NTT ELECTRONICS CORPORATION , ASAHI KASEI MICROSYSTEMS CO., LTD.
IPC分类号： H03G03/20
CPC分类号： H03G1/0088 , H03G3/30
摘要： An automatic dynamic range controlling circuit which is provided with a first circuit of a fixed gain, and a second circuit that has substantially the same propagation delay time as the first one and has a variable gain. The automatic dynamic range controlling circuit holds a peak value of an input signal and selects the first circuit when the peak value of the input signal is smaller than a reference signal level, and selects the second circuit when the peak value of the input signal exceeds the reference signal level. When the held peak value is smaller than the reference signal level, this controlling circuit is operated at the same gain as that of the first circuit for the input signal by setting the gain to that of the second circuit by the reference signal. When the held peak value exceeds the reference signal level, the gain of the second circuit is limited by the held peak value and the output level is made a specified level or below. Therefore, the discontinuity of a waveform of the output signal is prevented not only on the time base but also on the amplitude base for an excessive input signal level, thereby switching a selected circuit smoothly from the first one to the second one.
摘要翻译：具有固定增益的第一电路的自动动态范围控制电路和具有与第一电路基本上相同的传播延迟时间并具有可变增益的第二电路。自动动态范围控制电路保持输入信号的峰值，并且当输入信号的峰值小于参考信号电平时选择第一电路，并且当输入信号的峰值超过参考信号电平时选择第二电路参考信号电平。当保持的峰值小于参考信号电平时，通过将参考信号的增益设置为与第二电路的增益相比，该控制电路以与用于输入信号的第一电路相同的增益工作。当保持的峰值超过参考信号电平时，第二电路的增益被保持的峰值限制，并且输出电平被设定在指定电平以下。因此，输出信号的波形的不连续性不仅在时基上而且在过大的输入信号电平的幅度基础上被防止，从而使所选择的电路从第一个平滑地切换到第二个电路。

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