Thomas W Frederick

US Patent:

6351216, Feb 26, 2002

Filed:

Feb 5, 2001

Appl. No.:

09/777293

Inventors:

Thomas J. Frederick - Coconut Creek FL
Jeffrey T. Oakes - Boca Raton FL

Assignee:

Sensormatic Electronics Corporation - Boca Raton FL

International Classification:

G08B 1314

US Classification:

3405724

Abstract:

In an EAS system and method, a reference antenna is used to spatially separate the interference and tag signal allowing the interference signal to be removed, which improves performance of the EAS receiver. The reference antenna is coupled to the system by an adaptive filter, which can be a software filter that is continually adapting itself to optimum performance. The continuous adaptation obviates the need for manually tuning the coupling network and permits the system to perform at its optimum level over long periods of time.

US Patent:

6700490, Mar 2, 2004

Filed:

Mar 22, 2002

Appl. No.:

10/104829

Inventors:

Thomas J. Frederick - Coconut Creek FL

Assignee:

Sensormatic Electronics Corporation - Boca Raton FL

International Classification:

G08B 1314

US Classification:

3405724, 340 101, 375343, 708314, 708422

Abstract:

Digital implementation of electronic article surveillance (EAS) detection filtering for pulsed EAS systems is provided. Embodiments include direct implementation as a quadrature matched filter bank, as an envelope detector, a correlation receiver, and as a discrete Fourier transform. Pre-detection nonlinear filtering is also provided for impulsive noise environments.

US Patent:

6862719, Mar 1, 2005

Filed:

Mar 26, 2002

Appl. No.:

10/108205

Inventors:

Steven Embling - Pompano Beach FL, US
Michael A. Zampini - Boca Raton FL, US
William Jeffreys - Boynton Beach FL, US
Thomas Frederick - Coconut Creek FL, US
Ronald Alterio - Delray Beach FL, US
Fadi E. Ayoub - Boca Raton FL, US

Assignee:

Sensormatic Electronics Corporation - Boca Raton FL

International Classification:

G06F017/50
G06F009/45

US Classification:

716 5, 716 2, 716 4

Abstract:

Automatic tuning of an EAS antenna pedestal without the use of special tools or advanced training is provided. The capacitance of the antenna circuit is adjusted to tune the resonant frequency to the desired frequency. Measurement of the current level is used to validate that the antenna is resonant at the desired frequency. If the current level indicates that the antenna is not resonant at the specified frequency, LEDs located on a capacitor tuning board light to indicate where jumpers should be placed to add or remove capacitance from the circuit. Alternately, the capacitance values can be electronically added or removed from the circuit.

US Patent:

6906629, Jun 14, 2005

Filed:

Feb 8, 2002

Appl. No.:

10/071412

Inventors:

Thomas J. Frederick - Coconut Creek FL, US

Assignee:

Sensormatic Electronics Corporation - Boca Raton FL

International Classification:

G08B013/14

US Classification:

3405721, 3405681, 3405722, 3405724

Abstract:

Conventional EAS systems, such as ULTRA*MAX, use noncoherent detection and a highly nonlinear post detection combining algorithm. It is well known that using the phase information that is present in the received signal has advantages in detection performance. This is difficult to do in conventional ULTRA*MAX receiver because of the combination of a narrow signal bandwidth and short receive window duration. A method to incorporate signal phase into the detector by differential coherent combining is provided, which significantly improves processing gain that was not previously obtainable.

US Patent:

6947860, Sep 20, 2005

Filed:

Aug 9, 2002

Appl. No.:

10/216577

Inventors:

Thomas J. Frederick - Coconut Creek FL, US
Jeffrey T. Oakes - Boca Raton FL, US

Assignee:

Sensormatic Electronics Corporation - Boca Raton FL

International Classification:

H04Q005/22

US Classification:

702 72, 702122, 340 101

Abstract:

A ringdown canceller is provided for electronic article surveillance (EAS) tag response processing, which uses two adaptive replica signals and compares the replica signal phase to the receive signal phase to determine if there is a stationary EAS tag in the interrogation or detection zone. The adaptive replica buffers allow the system to adjust to changing ambient conditions, and adjust rapidly to an EAS tag that suddenly appears in the detection zone and becomes stationary, or to a stationary EAS tag that suddenly leaves the detection zone. The ringdown response of the transmitter circuit is constant, just like a stationary tag, and is removed from the receive signal in the same manner as a stationary tag.

US Patent:

7212117, May 1, 2007

Filed:

Jan 25, 2002

Appl. No.:

10/056947

Inventors:

Thomas J. Frederick - Coconut Creek FL, US
Jeffrey T. Oakes - Boca Raton FL, US

Assignee:

Sensormatic Electronics Corporation - Boca Raton FL

International Classification:

G08B 13/14

US Classification:

3405721, 340506, 340 101, 375356, 375376

Abstract:

A distributed wireless phase locked loop system for synchronizing the transmit carrier's modulating waveform, such as the transmitter pulse timing in a pulsed EAS system and the transmit sweeping function for swept RF synchronization, is provided. To remove the effect of phase noise on the power line signal, a phase locked loop is used to filter this signal. The filtered output is used as a reference to a second phase locked loop tied to a numerically controlled oscillator and the received signal to provide a distributed phase looked loop algorithm that is wireless, and automatically synchronizes adjacent EAS systems.

US Patent:

7301459, Nov 27, 2007

Filed:

May 4, 2005

Appl. No.:

11/121897

Inventors:

Thomas J. Frederick - Coconut Creek FL, US
Richard L. Herring - Wellington FL, US
Jeffrey T. Oakes - Boca Raton FL, US

Assignee:

Sensormatic Electronics Corporation - Boca Raton FL

International Classification:

G08B 13/14

US Classification:

3405724, 3405721, 3405681

Abstract:

A method for controlling operation of a transmitter in an electronic article surveillance (EAS) system is described that includes coupling each of a plurality of transmit channels to a corresponding antenna, configuring a modulator within each transmit channel to output a modulated signal to the corresponding antenna, providing feedback of each modulated signal, and adjusting operation of each modulator based on the feedback. An EAS transmitter and an EAS system are also described.

US Patent:

7495565, Feb 24, 2009

Filed:

May 4, 2005

Appl. No.:

11/121898

Inventors:

Jeffrey T. Oakes - Boca Raton FL, US
Thomas J. Frederick - Coconut Creek FL, US
Richard L. Herring - Wellington FL, US

Assignee:

Sensomatic Electronics Corporation - Boca Raton FL

International Classification:

G08B 13/14

US Classification:

3405726

Abstract:

A method for controlling electronic article surveillance (EAS) transmissions is described. The method includes calculating system parameters associated with one or more of a desired frequency, a desired duty cycle, and a desired phase difference between antennas for a transmitter, and initializing a counter with a value based on the system parameters. The method also includes comparing a count from the counter to the system parameters, and modulating EAS transmission signals based on the comparison between the count and the system parameters. An EAS transmitter and an EAS system are also described.