Television – Receiver circuitry – Power supply
Reexamination Certificate
2004-01-16
2008-11-25
Hsia, Sherrie (Department: 2622)
Television
Receiver circuitry
Power supply
C348S706000
Reexamination Certificate
active
07456906
ABSTRACT:
Systems and methods are provided that facilitate detection and processing of A/V device power status in A/V networks. Preferably, a power detection system includes a current sensor coupled to the power cord of an A/V device, a current-to-voltage converter coupled to the sensor, a voltage comparator coupled to the converter, a reference voltage output circuit coupled to the comparator, and a micro-controller coupled to the comparator and the reference voltage output circuit. In operation, the current being drawn by the A/V device through its power cord is detected and converted to an input voltage, which is then compared to a device specific threshold voltage. If the input voltage is not greater than the threshold voltage, a “Power On” command is sent to the A/V device and the detection, conversion and comparison process is repeated. If the input voltage is greater than the threshold voltage, desired commands and/or instructions are sent to the A/V device.
REFERENCES:
patent: 4439784 (1984-03-01), Furukawa et al.
patent: 4579338 (1986-04-01), Heffron
patent: 4903130 (1990-02-01), Kitagawa et al.
patent: 5231310 (1993-07-01), Oh
Batra Atul
Lou Wang He
Shimizu Tetsuya
Hsia Sherrie
Mitsubishi Digital Electronics America Inc.
Orrick Herrington & Sutcliffe LLP
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