Dipakkumar C Patel

US Patent:

6707917, Mar 16, 2004

Filed:

Jun 9, 1999

Appl. No.:

09/328906

Inventors:

Henry S. Landgraf - Cherry Hill NJ
Anthony Troiano - Princeton Junction NJ
Dipakkumar R. Patel - Hatboro PA

Assignee:

General Instrument Corporation - Horsham PA

International Classification:

H04H 500

US Classification:

381 11, 381 1

Abstract:

A monaural and stereo audio signal control system for use in cable-signal set-top boxes selects signal processing paths as a function of the monaural and stereo nature of the incoming audio component of the television signal and an indication as to whether the audio component is a âclearâ or âmaskedâ signal. A clear audio signal is a signal that conforms to a NTSC or BTSC standard that can be processed by a conventional television receiver while a âmaskedâ signal is one in which the carrier frequency has been changed or otherwise modified so that a conventional television receiver cannot extract the audio content. A signal-processing path is provided for conventional clear monaural and stereo audio and for a masked monaural signal and for a masked stereo signal. Monaural clear and masked processing is addressed by microprocessor controlled switching in accordance with control information provided in the television signal and stereo masked processing is addressed by the presence or absence of energy corresponding to the masked stereo carrier.

US Patent:

7039941, May 2, 2006

Filed:

Oct 30, 1998

Appl. No.:

09/182519

Inventors:

Louis Caporizzo - North Wales PA, US
Dipakkumar R. Patel - Hatboro PA, US

Assignee:

General Instrument Corporation - Horsham PA

International Classification:

H04N 5/445
H04N 7/173

US Classification:

725127, 725 38, 725128, 348726, 348734, 348738

Abstract:

In a cable television converter terminal, NICAM signal passthrough is achieved using an alignment-free passthrough circuit including a NICAM SAW filter. The alignment-free passthrough circuit directly taps the output of the converter terminal's tuner to obtain the NICAM signal. As a result, the NICAM signal is not distorted by the components involved in obtaining the other signal components of the cable television signal. Consequently, sound quality is improved and rendered less vulnerable to degradation due to component aging, temperature fluctuations, and human error. The passthrough circuit can be implemented as a removable circuit module.

US Patent:

7043211, May 9, 2006

Filed:

Nov 30, 1999

Appl. No.:

09/857010

Inventors:

Matthew G. Waight - Pipersville PA, US
Dipakkumar R. Patel - Hatboro PA, US

Assignee:

General Instrument Corporation - Horsham PA

International Classification:

H04B 1/04
H04B 1/26
H04N 3/27
H04N 5/455
H04N 7/16

US Classification:

455118, 455102, 455313, 4551961, 455255, 348554, 348726, 348729, 725151

Abstract:

A modulator generates a combined signal consisting of audio and video signals and converts the combined signal to one of a plurality of frequencies in dependence upon a desired output frequency and broadcast standard. The modulator includes a summing amplifier, a first frequency synthesizer and a second frequency synthesizer. The summing amplifier has a first input for receiving a video signal, a second input for receiving a first audio signal, a third input for receiving a second audio signal, and an output for outputting a modulated summed signal. The first frequency synthesizer generates a first frequency for mixing with the modulated summed signal to generate a high intermediate frequency (HI-IF) signal. The second frequency synthesizer generates a second frequency for mixing with said HI-IF signal to generate a desired RF output signal.

US Patent:

20040216166, Oct 28, 2004

Filed:

May 21, 2004

Appl. No.:

10/850671

Inventors:

Louis Caporizzo - North Wales PA, US
Dipakkumar Patel - Hatboro PA, US

International Classification:

H04N007/173
H04N007/16

US Classification:

725/131000, 725/139000, 725/150000

Abstract:

In a cable television converter terminal, NICAM signal passthrough is achieved using an alignment-free passthrough circuit including a NICAM SAW filter. The alignment-free passthrough circuit directly taps the output of the converter terminal's tuner to obtain the NICAM signal. As a result, the NICAM signal is not distorted by the components involved in obtaining the other signal components of the cable television signal. Consequently, sound quality is improved and rendered less vulnerable to degradation due to component aging, temperature fluctuations, and human error. The passthrough circuit can be implemented as a removable circuit module.

US Patent:

20050160475, Jul 21, 2005

Filed:

Mar 14, 2005

Appl. No.:

11/079031

Inventors:

Matthew Waight - Pipersville PA, US
Dipakkumar Patel - Hatboro PA, US

Assignee:

General Instrument Corporation - Horsham PA

International Classification:

H04N005/50

US Classification:

725151000

Abstract:

A modulator generates a combined signal consisting of audio and video signals, and converts the combined signal to one of a plurality of frequencies in dependence upon a desired output frequency and broadcast standard. The modulator includes a summing amplifier, a first frequency synthesizer and a second frequency synthesizer. The summing amplifier has a first input for receiving a video signal, a second input for receiving a first audio signal, a third input for receiving a second audio signal, and an output for outputting a modulated summed signal. The first frequency synthesizer generates a first frequency for mixing with the modulated summed signal to generate a high intermediate frequency (HI-IF) signal. The second frequency synthesizer generates a second frequency for mixing with the HI-IF signal to generate a desired RF output signal.

US Patent:

48089486, Feb 28, 1989

Filed:

Sep 28, 1987

Appl. No.:

7/101839

Inventors:

Dipakkumar I. Patel - Elkins Park PA
Randall S. Giampa - Horsham PA

Assignee:

Kulicke and Soffa Indusries, Inc. - Willow Grove PA

International Classification:

H03L 700

US Classification:

331 4

Abstract:

Apparatus for periodically sweeping a voltage controlled oscillator over a range of frequencies which includes a resonant frequency of a transducer being supplied with power by the voltage controlled oscillator through a power amplifier. The apparatus includes a digital phase detector having a voltage input coupled to the output of the power amplifier and a second voltage input coupled to a current sensor indicative of the phase of the current flowing through the supply circuit of the transducer to provie at the output of the phase detector a voltage signal indicative of phase difference between the voltage and the current in the transducer. The output of the phase detector is coupled to a processor and to the input of a summing circuit. The output of the processor is also coupled to the summing circuit to provide an offset voltage which adjusts the voltage controlled oscillator to the resonant frequency of the transducer.