Chandrakant M Patel

46943277, Sep 15, 1987

Mar 28, 1986

6/845850

Walter H. Demmer - Plainsboro Township, Middlesex County NJ
Leopold A. Harwood - Bridgewater NJ
Chandrakant B. Patel - Hopewell NJ
Alvin R. Balaban - Lebanon NJ

RCA Corporation - Princeton NJ

H04N 945

358 19

A digital television receiver includes a first phase locked loop which develops a sampling clock signal that is locked to the horizontal line synchronizing signal components of a composite video signal. A second digital phase locked loop is clocked by the sampling clock signal and develops a digital signal that is phase locked to the color burst signal. This digital signal is used as a regenerated color subcarrier signal to synchronously demodulate the chrominance components of the composite video signals into I and Q color difference signals. To compensate for frequency instability in the regenerated subcarrier signal caused by frequency instabilities in the line-locked clock signal, a third digital phase locked loop develops an output signal which is phase locked to a reference signal generated by a crystal controlled oscillator. Control signals from the third phase locked loop are applied to the second phase locked loop to substantially compensate for frequency instabilities in the regenerated subcarrier signal that are induced by the clock signals.

46865616, Aug 11, 1987

Jul 31, 1985

6/760910

Leopold A. Harwood - Bridgewater NJ
Robert A. Wargo - Ringoes NJ
Chandrakant B. Patel - Hopewell NJ

RCA Corporation - Princeton NJ

H04N 521

358 31

In a composite color video signal, a portion of the signal spectrum is shared by high frequency vertical detail information, and high frequency modulated color difference (I) information. A circuit is described which determines whether the information in the shared frequency band is vertical detail information or color difference information without degradation in the presence of a step input signal, as, for example, in the presence of lettering in the image. A composite video signal is comb filtered to generate comb filtered chrominance and luminance signals. A baseband color difference signal is produced from the comb filtered chrominance signal and the presence of high frequency information in the baseband color difference signal is detected. The bandwidth of the low frequency portion of the comb filtered chrominance signal (i. e. the vertical detail information) which is restored to the comb filtered luminance signal is varied in response to the control signal.

46511962, Mar 17, 1987

Mar 19, 1985

6/713753

Leopold A. Harwood - Bridgewater NJ
Chandrakant B. Patel - Hopewell NJ

RCA Corporation - Princeton NJ

H04N 964
H04N 977

358 38

A digital television receiver, which uses a comb filter to separate the luminance and chrominance components of composite video signals, includes an adaptive band-pass filter for processing the comb filtered chrominance signals. Comb filtered chrominance signals may include luminance vertical detail information at the relatively high frequencies also occupied by chrominance information. The adaptive band-pass filter is controlled to have a narrow bandwidth when significant amounts of this relatively high frequency vertical detail information are present and to have a wide bandwidth otherwise. Consequently, the bandwidth of the chrominance signal provided by this filter is restricted only when it is necessary to prevent distortion, and vertical detail is added to the luminance signal only when it is not likely to be contaminated with chrominance information.

61232661, Sep 26, 2000

Jul 11, 1997

8/892255

Gary Dean Bainbridge - Sparta NJ
Carla Betro - Rockaway NJ
Mayankkumar M. Dixit - Bridgewater NJ
Quang Duong - Denville NJ
Mahesh B. Mistry - Parsippany NJ
Stephen John Palaszewski - Chester NJ
Chandrakant B. Patel - Lakewood NJ

Lucent Technologies Inc. - Murray Hill NJ

F25D 2312

236 493

An outdoor battery cabinet is formed to include a cooling system to extend the life of the housed batteries. The cooling system comprises a ventilation system including an air intake unit, an exhaust unit and a thermostat control. The interior surface of the cabinet is covered with a layer of insulative material. The ventilation system is configured to turn "on" when the outdoor temperature drops below the interior cabinet temperature, thereby cooling the housed batteries. Once the outdoor temperature rises above the cabinet temperature, the ventilation system is turned "off" and the insulation in the cabinet functions to maintain the cooler ambient temperature within the cabinet. To minimize the effects of wind forcing air through the ventilation openings, the intake and exhaust louvers are located on the same side of the cabinet.