David J Rowe

US Patent:

7136109, Nov 14, 2006

Filed:

Mar 20, 2003

Appl. No.:

10/392658

Inventors:

Mohammad Alkhalili - Dumont NJ, US
David Rowe - Campbell Hall NY, US

Assignee:

Pelco - Clovis CA

International Classification:

H04N 5/04
H04N 5/06

US Classification:

348537, 348536, 348512, 327156

Abstract:

A pixel clock generating circuit is provided in which a digital circuit generates a first signal corresponding to the relative frequency of the pixel clock as compared with a predetermined desired pixel clock frequency. An analog circuit is electrically coupled to the digital circuit in which the analog circuit has a reverse biased variable capacitance device, an integrator and a comparator circuit. The reverse biased variable capacitance device has an anode and a cathode. The integrator has an input coupled to the digital circuit and an output coupled to the cathode of the reverse biased variable capacitor. The integrator is arranged to integrate the first signal received from the digital circuit and produce an output voltage across the reverse biased variable capacitance device such that the output voltage causes the capacitance of the reverse biased capacitor to change if the pixel clock is not operating at the predetermined desired pixel clock frequency. The comparator circuit is electrically coupled to the anode of the reverse biased variable capacitor and produces the pixel clock having a frequency based on the capacitance of the reverse biased capacitor.

US Patent:

20100245665, Sep 30, 2010

Filed:

Mar 31, 2010

Appl. No.:

12/751887

Inventors:

Albert Thomas Dodrill - Pomona NY, US
Glenn C. Waehner - Fresno CA, US
David A. Rowe - Campbell Hall NY, US

Assignee:

ACUITY SYSTEMS INC - NEW WINDSOR NY

International Classification:

H04N 11/20
H04N 5/268

US Classification:

348445, 348706, 348E05057, 348E11021

Abstract:

A video switching and control system is described that provides compatibility with conventional analog cameras while also accepting network IP type cameras. The system offers reduced control latency, improved recording efficiency, and more flexible display features with greatly improved performance and update rates.The system offers greatly reduced wiring and installation complexity thus improving reliability. The architecture is scalable and expandable in either the analog camera count or the IP camera count. The system integrates these two camera technologies so that the camera source or recorder is transparent to the user. Each user can control all video sources, analog, IP, or recorded, from one keyboard and one or more monitors at each work station.The unique all digital solution provides digital reliability and broadcast quality performance. The solution is significantly smaller and substantially lower cost the previous solutions, and offers higher monitor output capacity without the need for expensive down framing approaches currently used in the industry.