专利检索 ap:("ARRIS Enterprises LLC") AND inv:"HOWALD, Robert, L." 第 1 页

1.

发明授权
NARROWBAND INTERFERENCE AND IDENTIFICATION AND DIGITAL PROCESSING FOR CABLE TELEVISION RETURN PATH PERFORMANCE ENHANCEMENT 有权

公开(公告)号：EP1639822B1

公开(公告)日：2019-10-02

申请号：EP04754807.8

申请日：2004-06-08

申请人： ARRIS Enterprises LLC

发明人： BOOTH, Ted, Nelson , HOWALD, Robert, L.

IPC分类号： H04N7/10 , H04N7/173 , H04N21/61

2.

发明授权
DIGITAL SIGNAL PROCESSING SCHEME FOR HIGH PERFORMANCE HFC DIGITAL RETURN PATH SYSTEM WITH BANDWIDTH CONSERVATION 有权
标题翻译：具有带宽保存的高性能HFC数字回传通道系统的数字信号处理方案

公开(公告)号：EP1634144B1

公开(公告)日：2018-02-21

申请号：EP04776398.2

申请日：2004-06-08

申请人： ARRIS Enterprises LLC

发明人： ZHANG, Mao, Zhu , HOWALD, Robert, L.

IPC分类号： H03M7/50 , H03M7/00 , H03M7/46

CPC分类号： H03M7/50 , H03M7/30 , H04N7/17309 , H04N7/22 , H04N21/6168

摘要： In a cable return path system, a method for performing digital companding adds a predetermined offset to the digital value to be companded, and employs a modified μ-law or a-law companding technique to obtain a reduced bit length digital value. One embodiment of this modified approach adds a predetermined offset (e.g., 129 for a 12-bit implementation) to the digital value before companding and then employs a two-bit chord and a 5-bit step for the 12-bit implementation. The end result is that the performance metrics are not significantly compromised by this bit reduction when compared to current transmission methods without this technique.