David C Kang

US Patent:

7463874, Dec 9, 2008

Filed:

Oct 18, 2004

Appl. No.:

10/968551

Inventors:

David Dukho Kang - Fullerton CA, US
Chun-Huat Heng - Singapore, SG

Assignee:

Chrontel, Inc. - San Jose CA

International Classification:

H04B 1/18

US Classification:

455285, 455213

Abstract:

A fully-integrated tuner for performing signal channel selection and image rejection in an analog cable television system is provided. Various embodiments disclose a tuner including an analog RF section to process an analog RF input signal and generate complex low intermediate frequency digital signals, and a signal processing section configured to reduce image and signal leakage in the complex low intermediate frequency signals. The signal processing section selects a signal channel of the complex low intermediate frequency signals and suppresses channel components adjacent to the signal channel. In one embodiment, the signal processing section includes a complex digital signal channel select filter to select the signal channel and suppress the adjacent channel components. In other embodiments, the complex digital signal channel select filter selects the signal channel, shapes the selected signal channel to generate a shaped signal channel, and equalizes a group delay of the shaped signal channel.

US Patent:

20210114134, Apr 22, 2021

Filed:

Oct 18, 2019

Appl. No.:

16/658010

Inventors:

Hong Kang - San Marino CA, US
David Kang - San Marino CA, US

International Classification:

B23K 11/30

Abstract:

The seam welder conductive mechanism is the main part of the resistance seam welding machine. When the electrode wheel rolling on the welded parts, the Seam welder conductive mechanism will withstand the high press of electrode force and pass the high welding current from welding transformer to the electrode wheels of seam welding machine. Because of these two characteristics the following factors must be considered during the design of seam welder conductive mechanism. First of all, in order to withstand the high press of electrode force two bearings are introduced in the mechanism, the bearing should be lubricated and also isolated from the welding current in order to get long working time without damaging the bearing. Second of all, in order to pass the high welding current, the conductive pair with relative motion must be keep conduction all the time with certain surface pressure and lubrication, the conductive pair without relative motion must be keep conduction all the time with big surface pressure. Because of the high current pass through the conductive mechanism must be cooled with water during working. This is a mechanism equipped with water cooling for Electrode, main shaft, and Silver-plate conductive pads.