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2. 发明授权

US06744830B1 Digital broadcasting signal receiver 失效
标题翻译：数字广播信号接收机
公开(公告)号：US06744830B1
公开(公告)日：2004-06-01
申请号：US09670692
申请日：2000-09-28
申请人： Hitonobu Furukawa , Hiroaki Ozeki , Masami Takigawa , Junichi Fukutani , Yuichi Watanabe , Kazuyori Domoto
发明人： Hitonobu Furukawa , Hiroaki Ozeki , Masami Takigawa , Junichi Fukutani , Yuichi Watanabe , Kazuyori Domoto
IPC分类号： H04L2708
CPC分类号： H04N5/4401 , H03G3/3089 , H04H40/18 , H04L7/04 , H04N5/50 , H04N21/4384
摘要： A receiver for a digital broadcasting service have a compatibility between tuning to a desired channel at a short period of time and an improve ment of a bit error rate (BER) characteristics. In a case where a target wave is fluctuated, to prevent the receiver from having a significant declination of BER characteristics and to ensure the reproduction of high quality images, the receiver includes an automatic gain controller including a loop filter in which the frequency range of the loop filter can be switched according to an output of a synchronous state discriminator. The frequency band of the loop filter is selectively adjusted to one setting designed for minimizing the duration for tuning a desired channel before a synchronous state is established. After the synchronous state established, the frequency band of the loop filter is switched to another setting designed for enhancing BER characteristics.
摘要翻译：用于数字广播服务的接收机具有在短时间段内调谐到期望信道和提高误码率（BER）特性之间的兼容性。在目标波波动的情况下，为了防止接收机具有BER特性的显着偏差并且确保高质量图像的再现，接收机包括自动增益控制器，该自动增益控制器包括环路滤波器，其中频率范围可以根据同步状态鉴别器的输出来切换环路滤波器。环路滤波器的频带被选择性地调整为设计用于在建立同步状态之前最小化用于调谐期望信道的持续时间的一个设置。在建立同步状态之后，环路滤波器的频带被切换到另一个设计用于提高BER特性的设置。

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