Inventor
XIE ZHENG-YI
US8 patents
Patents
8 patentsUS5809133ASep 15, 1998
DTMF detector system and method which performs frequency domain energy calculations with improved performance
ADVANCED MICRO DEVICES INC70 citations95
US5841385ANov 24, 1998
System and method for performing combined digital/analog automatic gain control for improved clipping suppression
ADVANCED MICRO DEVICES INC66 citations94
US5887059AMar 23, 1999
System and method for performing echo cancellation in a communications network employing a mixed mode LMS adaptive balance filter
ADVANCED MICRO DEVICES INC52 citations92
US5694466ADec 2, 1997
DTMF detector system and method which performs improved twist computation and thresholding
ADVANCED MICRO DEVICES INC26 citations92
US5644634AJul 1, 1997
System and method for dual tone multifrequency detection using variable frame widths
ADVANCED MICRO DEVICES INC27 citations92
US5838269ANov 17, 1998
System and method for performing automatic gain control with gain scheduling and adjustment at zero crossings for reducing distortion
ADVANCED MICRO DEVICES INC40 citations91
US5588053ADec 24, 1996
DTMF detector system and method which performs static and dynamic thresholding
ADVANCED MICRO DEVICES INC29 citations91
US5796815AAug 18, 1998
Communications device with improved ring signal detection
ADVANCED MICRO DEVICES INC25 citations88