公开(公告)号：US20140173668A1

公开(公告)日：2014-06-19

申请号：US13886470

申请日：2013-05-03

申请人： SUNPLUS TECHNOLOGY CO., LTD.

发明人： Chun-Chieh TSENG ,  Chih-Yao CHIANG

IPC分类号： H04N21/647 ,  H04N21/643 ,  H04N21/61

CPC分类号： H04N21/6143 ,  H04N5/50

摘要： A fast blind scan method first initializes pointers to fetch a block of spectrum and then checks whether the block contains a high spectrum signal and whether the difference between a carrier frequency of the high spectrum signal and a start pointer is greater than a first threshold. When the high spectrum signal is absent or the difference is not greater than the first threshold, it checks whether there is a full band channel in the block. When the full band channel exists, a signal detection and parameter extraction operation is performed and the start pointer is set to be a frequency of a second cross point. Then, it checks whether the difference between the start pointer and an end pointer is greater than a second threshold and, if not, a carrier frequency pointer is set to enable a tuner to fetch a next block.

摘要翻译： 快速盲扫法首先初始化指针以获取一个频谱块，然后检查该块是否包含高频信号，以及高频信号的载波频率与起始指针之间的差是否大于第一阈值。 当高频信号不存在或差不大于第一阈值时，它检查块中是否存在全频带信道。 当存在全频带信道时，执行信号检测和参数提取操作，并将起始指针设置为第二交叉点的频率。 然后，它检查起始指针和结束指针之间的差是否大于第二阈值，如果不是，则设置载波频率指针以使得调谐器能够获取下一个块。