Hong M Jiang

US Patent:

6349007, Feb 19, 2002

Filed:

Jul 25, 2001

Appl. No.:

09/682127

Inventors:

Hong Jiang - Milpitas CA

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G11B 2736

US Classification:

360 31, 360 46, 360 67, 360313

Abstract:

A circuit ( ) for detecting a fault in a magneto-resistive head ( ) includes a transconductance amplifier ( ) having an input across which the head ( ) is connected. A circuit ( ) for determining a ratio of a current in the head, I , to a variable control current, I , is applied to maintain a substantially constant voltage at an output of the transconductance amplifier ( ). The current, I , in the head is a function of the variable control current, I , The circuit for determining a ratio of a current, I , flowing in the head ( ) to the variable control current, I , comprises first ( ) and ( ) second current mirrors, the first current mirror ( ) mirroring the current flowing in the head ( ), and the second current mirror ( ) mirroring the variable control current, I , Circuitry ( ) is provided that triggers fault indicating output signals if the ratio falls outside a predetermined range.

US Patent:

6445752, Sep 3, 2002

Filed:

Feb 12, 1999

Appl. No.:

09/248904

Inventors:

Hong Jiang - Montclair NJ
Paul L. Palmieri - New Providence NJ
Agesino Primatic, Jr. - Frenchtown NJ
Lesley J. Wu - Parsippany NJ
Liangkai Yu - New Providence NJ

Assignee:

Agere Systems Guardian Corp. - Miami Lakes FL

International Classification:

H04L 2714

US Classification:

375326, 375235

Abstract:

A phase tracker receives a signal component x and forms a phase- and gain-corrected signal z. In particular, the phase tracker performs a Hilbert transform of x to produce a quadrature phase component y to form the constellation defined by (x , y ). Consequently, phase rotation and gain adjustment are combined into a linear transform of the constellation defined by (x , y ). The linear transform z =x +y employs two coefficients and. The coefficients and of the linear transform are derived so as to provide an optimal solution according to minimum mean square error. Approximations to the coefficients and of the linear transform may be iteratively determined with a stochastic gradient method. Advantages of employing the phase- and gain-corrected signal z as an I-phase detection result of a demodulator include 1) the phase rotation and gain adjustment are combined into one operation, and 2) the a sine/cosine lookup table is not employed. Including both phase rotation and a gain adjustment may provide for better performance of the demodulator.

US Patent:

6487034, Nov 26, 2002

Filed:

Jun 8, 2001

Appl. No.:

09/681811

Inventors:

Hong Jiang - Milpitas CA
James Nodar - Dallas TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G11B 502

US Classification:

360 68, 360 31, 360 66, 369 5342, 340652

Abstract:

A circuit ( ) and method are provided for generating a signal ( ) indicating an open impedance fault of a coil ( ) of a write head ( ) of a mass data storage device ( ). The circuit ( ) includes a differential amplifier ( ) with the electrical component ( ) being connected as a load in a first leg thereof. An impedance element ( ) is provided in a second leg of the differential amplifier ( ), and a pair of bipolar transistors ( ) are respectively connected in the first and second legs. The pair of bipolar transistors ( ) have a constant bias voltage (Bias) applied to inputs thereof, and an output circuit is connected to an output node of the first leg of the differential amplifier ( ).

US Patent:

6760737, Jul 6, 2004

Filed:

Jan 16, 2001

Appl. No.:

09/760923

Inventors:

Hong Jiang - Warren NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G06F 708

US Classification:

708202

Abstract:

A spatial median filter determines a median of a plurality of values by dividing the plurality of values into a plurality of groups of values. The values in each of the groups are sorted to determine its median. Then, the medians of the plurality of groups are fully sorted. Certain of the sorted values are eliminated from prescribed ones of the groups in accordance with prescribed criteria based on the number of values in the group and the median value of the group values. The remaining values are sorted to determine the median of the plurality of values.

US Patent:

6775078, Aug 10, 2004

Filed:

Sep 14, 2001

Appl. No.:

09/952952

Inventors:

Hong Jiang - Milpitas CA

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G11B 503

US Classification:

360 46, 360 66, 360 67, 360 75, 324210, 324212

Abstract:

A circuit and method are presented for detecting a fault in a magneto-resistive head ( ). The circuit includes a bias circuit ( ) to produce a bias voltage across the head ( ) and a pair of resistors ( ) in series with the head ( ) connected to the bias circuit ( ) to carry a current (I ) from the bias circuit ( ) in common with the head. A circuit ( ) is provided to determine a ratio of a voltage across the head ( ) with respect to a voltage across the head ( ) and the pair of resistors ( ), and a circuit ( ) is provided for indicating a fault if the ratio falls outside a predetermined range.

US Patent:

6825853, Nov 30, 2004

Filed:

Mar 26, 2002

Appl. No.:

10/106546

Inventors:

Hong Jiang - Warren NJ
Agesino Primatic, Jr. - Frenchtown NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G09G 502

US Classification:

345604, 345600, 345644, 348441, 348444, 382162, 382167

Abstract:

Color space conversion from a first image definition scheme to a second image definition scheme is realized by utilizing only one step of matrix multiplication and by determining whether determined RGB values are in a valid RGB region and, if not, generating a first modification factor to bring the RGB vector onto or in close proximity to the boundary of the valid RGB region. Then, the first modification factor is employed to modify in a prescribed manner the converted chroma values. In a specific embodiment of the invention, only a single matrix multiplication is employed and the otherwise additional required multiplication and/or division steps are realized by additions and/or subtractions and by employing a prescribed iterative process to bring the RGB values into or close to the valid RGB color space region. The converted chroma values are also modified by associated second modification factors also generated in the iteration process. In another specific embodiment of the invention, the converted chroma values are modified or not during an iteration depending upon whether a factor corresponding to and related to R , G , B is within a specific color space region or not.

US Patent:

6834225, Dec 21, 2004

Filed:

Feb 9, 2004

Appl. No.:

10/775018

Inventors:

Hong Jiang - Canton MI
Bal Sankpal - Canton MI
Steven Thomas - Bloomfield Hills MI
Timothy Allen - Livonia MI

Assignee:

Ford Global Technologies, LLC - Dearborn MI

International Classification:

G06F 770

US Classification:

701 67, 701 69, 701 89, 701 90, 180197, 180248, 74665, 74333

Abstract:

In a motor vehicle driveline including a transfer case whose output is continually connected to a first output, a clutch, operating partially engaged, responds to a control signal to change the degree of clutch engagement, whereby a second output is connected driveably to the first output. A digital computer, repetitively executing a computer readable program code algorithm for operating the clutch partially engaged, continually selects a desired magnitude of clutch engagement with reference to functions indexed by vehicle speed and either engine throttle position or engine throttle rate. The computer repetitively updates at frequent intervals the desired degree of clutch engagement, and issues a command clutch duty cycle to a solenoid-controlled valve, which signal changes the degree of clutch engagement in response to the command signal.

US Patent:

7058076, Jun 6, 2006

Filed:

Jul 8, 1999

Appl. No.:

09/349521

Inventors:

Hong Jiang - Westfield NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04J 1/16

US Classification:

370465

Abstract:

A “Wireless INfrastructure Network”(WINN) comprises packet endpoints such as servers, routers, base stations and gateways. No mobile switching center (MSC) is required. Communications between these endpoints is Internet Protocol (IP) based and voice communications between base station endpoints occurs directly without use of an MSC. Each base station comprises a router and converts wireless air interface signaling to a common IP signaling format.