Gary W Cole

US Patent:

7047556, May 16, 2006

Filed:

Jun 8, 2001

Appl. No.:

09/877984

Inventors:

Gary Dean Cole - Corona CA, US
Manfred Schneider - Costa Mesa CA, US
Art Garcia - San Dimas CA, US
Mike A. Andrews - Anaheim CA, US

Assignee:

RGB Systems, Inc. - Anaheim CA

International Classification:

H04N 7/16

US Classification:

725149, 348914, 348613, 348621, 333 28 R

Abstract:

A apparatus and apparatus for compensating for video insertion loss due to transmission over long twisted pair cable lines is presented. Transmission of video over twisted pair cable is advantageous because of its superior cost advantage over coaxial cable. However, twisted pair cables have significant loss characteristics at the higher frequencies (i. e. , broadband) compared to coaxial cables. At a transmitter station, the video signal is amplified in the high frequency region for possible skin effect losses thereby brute forcing the high frequency components to the receiving station. At the receiver station, the video signal is further compensated for diffusion line and skin effect losses. The total skin effect compensation applied in both the transmitter and receiver stations is such that the square root of frequency characteristics of skin effect losses is compensated for. Thus, at the receiving station, the high frequency compensation added at the transmitter to brute force the high frequency components to the receiving station may be removed if found excessive.

US Patent:

20060268167, Nov 30, 2006

Filed:

May 16, 2006

Appl. No.:

11/435559

Inventors:

Gary Cole - Corona CA, US
Manfred Schneider - Costa Mesa CA, US
Art Garcia - San Dimas CA, US
Mike Andrews - Anaheim CA, US

Assignee:

RGB Systems, Inc. - Anaheim CA

International Classification:

H04N 11/02
H04N 7/12
H04N 9/64
H04N 5/14
H04N 11/04
H04N 5/44

US Classification:

348398100, 348397100, 348553000, 348577000

Abstract:

A apparatus and apparatus for compensating for video insertion loss due to transmission over long twisted pair cable lines is presented. Transmission of video over twisted pair cable is advantageous because of its superior cost advantage over coaxial cable. However, twisted pair cables have significant loss characteristics at the higher frequencies (i.e., broadband) compared to coaxial cables. At a transmitter station, the video signal is amplified in the high frequency region for possible skin effect losses thereby brute forcing the high frequency components to the receiving station. At the receiver station, the video signal is further compensated for diffusion line and skin effect losses. The total skin effect compensation applied in both the transmitter and receiver stations is such that the square root of frequency characteristics of skin effect losses is compensated for. Thus, at the receiving station, the high frequency compensation added at the transmitter to brute force the high frequency components to the receiving station may be removed if found excessive. Additionally, compensation is included to adjust for skew that may occur because of irregularities between the various twisted pairs used to transmit the individual video components. Non-minimum phase type filters are used to inject delay into the faster arriving signals so that they may coincide in phase with later arriving signals resulting in a true reproduction of the video.

US Patent:

20090059782, Mar 5, 2009

Filed:

Aug 29, 2007

Appl. No.:

11/897518

Inventors:

Gary Dean Cole - Corona CA, US

International Classification:

H04J 11/00
H04L 27/36

US Classification:

370206, 375298, 375345

Abstract:

A closed loop feedback system is employed in a receiver to automatically compensate the communication signal from twisted pair cables for AC and DC losses. This is accomplished through the use of a reference pulse signal which is sent along with other digital information. At the receiver, the reference pulse signal is restored to its proper level through a Pulse Width Modulation (PWM)-controlled variable compensation amplifier circuit. The received reference signal is compared to a known reference value and the duty cycle of the PWM circuit is adjusted until the proper level reference signal is achieved. Thereafter, the digital signal is extracted. OFDM (Orthogonal Frequency Division Multiplexing) with pilot tones are used to maximize payload while minimizing crosstalk effects. The pilot tones locate the OFDM symbols in time while supplying compensation information concerning the transmission medium.

US Patent:

20090060046, Mar 5, 2009

Filed:

Aug 29, 2007

Appl. No.:

11/897547

Inventors:

Gary Dean Cole - Corona CA, US

International Classification:

H04B 1/66

US Classification:

37524021, 375E07279

Abstract:

A feedback circuit for restoration of DC reference levels in video signals is presented. In one or more embodiments, a DC sample pulse is generated representing the back porch of an incoming video signal. A sample and hold circuit, which is controlled by the DC sample pulse, obtains the correct offset voltage in the output signal during this back porch period. The offset voltage feeds back through an integrating node in front of the circuit causing an amplifier to compensate for the signal offset thereby restoring the video signal to its proper DC voltage level with respect to ground.