Toan D Vu

6385442, May 7, 2002

Mar 4, 1998

09/034826

Hoai Xuan Vu - Stanton CA
Toan Xuan Vu - Stanton CA

Symbol Technologies, Inc. - Holtsville NY

H04B 126

455318, 455205, 331 57, 331 45, 327238, 375332

A differential ring oscillator is provided with three differential amplifiers and provides three-phase output signals which can be used for synchronous detection of a received multi-phase modulated signal in a multi-phase receiver, wherein the phase of the local oscillator signals may be in other-than-quadrature relation. Two of the phase outputs of the local oscillator can be combined to provide a signal that is in quadrature with the remaining output. The oscillator is preferably controlled in coarse frequency control steps and using a fine voltage control signal responsive to a phase-locked loop to reduce frequency modulation of the oscillator signal arising out of leakage signals.

7162368, Jan 9, 2007

Nov 9, 2004

10/984531

Robert W. Levi - Fountain Valley CA, US
Toan X. Vu - Fountain Valley CA, US

Honeywell International Inc. - Morristown NJ

G01C 21/28

701300, 701213

The invention relates to a device, system, and method for providing a multi-mode navigation device. In a first mode of operation, the navigation device provides position information based on a radio frequency navigation signals. If radio signals become unavailable, the navigation device enters a second mode of operation. In the second mode of operation the navigation device stores the most recent elevation and associates it with a reference elevation, the reference elevation is associated with an entry floor. The difference between a current elevation and the reference elevation is determined and this difference is divided by a floor height to obtain a floor number. The navigation device provides the floor number while reliable global position information is unavailable.

7928724, Apr 19, 2011

May 27, 2008

12/127691

Toan Vu - Huntington Beach CA, US
Tom Judd - Carlsbad CA, US
Ron Fang - Cerritos CA, US
Bruce Graham - West Covina CA, US

Honeywell International Inc. - Morristown NJ

G01B 7/14
G01P 13/00
G01P 3/42

32420723, 324165

Systems and methods for determining a directional movement of an object such as a wheeled vehicle. The system includes a magnet having a north pole and a south pole mounted to the object, a single magnetic sensor positioned such that the sensor can individually detect each magnetic pole as the object moves, the sensor configured to produce a first characteristic signal when a north pole is detected and a second characteristic signal when a south pole is detected, and a processing device in signal communication with the sensor, the processing device configured to determine a directional movement of the object based on a configuration of a signal doublet that includes the first and second characteristic signals. The methods include sensing the north and south poles as they pass the magnetic sensor and determining a direction based on an order in which the north and south poles are sensed.

8373110, Feb 12, 2013

May 26, 2009

12/472014

Ron Fang - Cerritos CA, US
Toan Vu - Huntington Beach CA, US

Honeywell International Inc. - Morristown NJ

G06T 7/20

25023113, 345166, 25023114, 382103

A system and method for measuring linear and angular displacement of a moving object, such as an autonomous moving object. In one embodiment, the system comprises at least one optical mouse sensor mounted adjacent to and at a predetermined distance from a surface of the autonomous moving object or a working surface. A processor on the autonomous moving object is operatively coupled to the optical mouse sensor. The optical mouse sensor outputs linear and angular displacement values to the processor during movement of the autonomous moving object to determine a direction and distance traveled by the autonomous moving object.

8374816, Feb 12, 2013

Jun 8, 2010

12/796311

Toan Vu - Huntington Beach CA, US

Honeywell International Inc. - Morristown NJ

G06F 19/00
G01C 17/38

702 92

A magnetic compass comprising a magnetometer for taking readings of a magnetic field and a processing unit that calibrates the magnetic compass is provided. The processing unit is configured to validate a predetermined number of magnetic field samples and calculate calibration coefficients from the validated magnetic field samples. Each validated magnetic field sample is at least a minimum separation angle apart from every other validated magnetic field sample.

8552362, Oct 8, 2013

Jan 17, 2013

13/744000

Toan Vu - Huntington Beach CA, US

Honeywell International Inc. - Morristown NJ

G06F 3/0354

25023113, 25023114, 343166

A system and method for measuring linear and angular displacement of a moving object, such as an autonomous moving object. In one embodiment, the system comprises at least one optical mouse sensor mounted adjacent to and at a predetermined distance from a surface of the autonomous moving object or a working surface. A processor on the autonomous moving object is operatively coupled to the optical mouse sensor. The optical mouse sensor outputs linear and angular displacement values to the processor during movement of the autonomous moving object to determine a direction and distance traveled by the autonomous moving object.

57582742, May 26, 1998

Mar 13, 1996

8/615347

Hoai X. Vu - Stanton CA
Toan Vu - Lake Grove NY

Symbol Technologies, Inc. - Holtsville NY

H04B 116

4552461

The receiver for receiving data carried by the carrier frequency signal and, in a heterodyning system, for downconverting the received signal to a suitable intermediate frequency signal. The modulator and the downconverter are formed on a single semiconductor body, or chip of silicon. The receiver section is adapted to receive, over a predetermined overall bandwidth, signals having carrier frequencies within a plurality of frequency channels, each one of the channels having a predetermined channel bandwidth. The downconverted signals are converted into corresponding digital signals. A demodulator includes a pair of filters having Hilbert-Transform relationship with respect to each other. The receiver includes: a first automatic gain control circuit (AGC) which is responsive to an output of the digital signal processor, for adjusting the gain of the AGC circuit in accordance with the output of the digital signal processor; and, a second AGC circuit fed by the digital signals and the output of the digital signal processor, for adjusting the gain of the magnitude of the digital signals in accordance with the output of the digital signal processor.

56685050, Sep 16, 1997

Mar 13, 1996

8/614592

Hoai X. Vu - Stanton CA
Toan Vu - Lake Grove NY

Symbol Technologies, Inc. - Holtsville NY

H03B 502

331 49

An oscillator is provided having a plurality of cascade coupled inverters Each one of the inverters is a differential amplifier having a p-input and an n-input. The output of each one of the amplifiers is connected to: the n-input of the next succeeding amplifier to provide a closed loop, or ring oscillator; and, the p-input of an amplifier positioned an even number of amplifier stages forward of such next succeeding amplifier. In a preferred embodiment, each amplifier in the ring includes an n channel transistor (nMOS transistor) connected in a totem pole arrangement, to a p channel transistor (pMOS transistor). The gate of the nMOS transistor provides the n-input and gate of the pMOS transistor provides the p-input. The source and drain paths of the pMOS and nMOS transistors are connected together to provide an output for the amplifier. With such arrangement, because the gate of the more slowly responding pMOS transistor is driven before the gate of the nMOS transistor the oscillator is adapted to operate at a higher frequency of oscillation.