TIMOTHY SHANE MURPHY
Pilots at Alice St, Ramona, CA

6567520, May 20, 2003

Feb 17, 1999

09/251174

Timothy F. Murphy - Ramona CA
Christopher R. Hansen - Grass Valley CA

3Com Corp. - Santa Clara CA

H04M 300

379377, 379164

A method and apparatus for the detection of one or more telephone off-hook conditions using an analog-to-digital converter to detect voltage changes between tip and ring lines of a telephone network loop. An isolation network provides substantial electrical isolation for a detection device from voltage surges on the tip and ring lines of a “plain old telephone system” (POTS) network. The isolation network also provides a minimal load on the POTS wiring system, so as not to cause a false detection of an off-hook condition by central office equipment. A gain amplifier is used to scale the tip and ring voltage to a suitable range for an analog-to-digital converter (ADC). The ADC outputs a digital voltage value to a decision-making element, such as a microprocessor, a digital signal processor, or a state machine. The decision-making element can detect when multiple POTS devices coupled to the network wiring loop go into an off-hook state. The invention can also detect and compensate for a tip/ring wiring pair reversal and is highly reliable.

6320867, Nov 20, 2001

May 27, 1998

9/085878

Donald Morgan Bellenger - Los Altos Hills CA
Timothy F. Murphy - Ramona CA

3Com Corporation - Santa Clara CA

H04L 1264

370420

The current invention provides apparatus for relieving congestion associated with interfacing voice-band data, and broad-band data, with a network such as the public switched telephone network (PSTN). A hierarchical system for converting digital transmissions on a network between a first protocol and a second protocol is disclosed. The transmissions are generated by data terminals communicating in a third protocol with the network. The hierarchical system includes: interface units, a local processor, a first remote processor and a first controller. The interface units are each coupled to corresponding ones of the data terminals and each signal a call session with the corresponding data terminal. The interface units convert the transmissions from the data terminal in the third protocol to the second protocol. The local processor is switchably coupled to the interface unit and communicates with the network.

7203245, Apr 10, 2007

Mar 31, 2003

10/403552

Timothy F. Murphy - Ramona CA, US

3Com Corporation - Marlborough MA

H04K 1/10, H04B 1/38

375260, 375219

The present invention relates to the field of data communication electronics and to a wired or wireless signal transmitter or receiver and methods providing improved signal-to-noise ratio (SNR) performance for the reception of data packets transmitted in the form of symbols modulated onto a signal. More particularly, methods and methods are disclosed for detecting the preamble and symbol boundaries of received data packets encoded with OFDM and other multi-carrier symbol transmission systems. Also disclosed are combinations of sensitive preamble detection and data payload and/or signal field encoding methods to spread data redundantly, to improve reception under a low SNR condition. This invention may be applied to a variety of standards utilizing OFDM and similar technologies, including IEEE 802. 11a, Hiperlan/2 and MMAC. Particular aspects of the present invention are disclosed in the claims, specification and drawings.

7110467, Sep 19, 2006

Dec 20, 2000

09/742686

Vlad Mitlin - San Diego CA, US
Timothy F. Murphy - Ramona CA, US

3Com Corporation - Marlborough MA

H04L 27/04, H04B 1/38

375295, 375222

A method and apparatus selects forward error correction parameters in a channel having a plurality of subchannels in a multicarrier communications system. A signal-to-noise ratio representing a subset of the subchannels is determined. A number (s) of discrete multi-tone symbols in a forward-error-correction frame, a number (z) of forward-error-correction control symbols in the discrete multitone symbol associated with the signal-to-noise ratio, a number of subchannels associated with the signal-to-noise ratio, and a net coding gain for different values of s, z, signal-to-noise ratios and numbers of subchannels is stored in a table. Forward error correction parameters of the channel are selected based on the net coding gain by applying an approximation to a subset of values in the table.

2005026, Dec 1, 2005

May 11, 2004

10/843056

Timothy Murphy - Ramona CA, US
Ralph Temple - San Diego CA, US

Texas Instruments Incorporated - Dallas TX

H04J011/00

370208000

The present invention provides an orthogonal frequency division multiplex (OFDM) packet detect unit. In one embodiment, the OFDM packet detect unit includes a correlation indicator configured to cross-correlate a received symbol and a stored standard symbol to yield a correlation result. Additionally, the OFDM packet detect unit also includes a threshold discriminator coupled to the correlation indicator and configured to produce a packet detect signal for a fast Fourier transform (FFT) placement peak based on a comparison between the correlation result and a threshold.

7280621, Oct 9, 2007

Mar 31, 2003

10/403553

Timothy F. Murphy - Ramona CA, US

3Com Corporation - Marlborough MA

H03D 1/00

375340

The present invention relates to the field of data communication electronics and to a wired or wireless signal transmitter or receiver and methods providing improved signal-to-noise ratio (SNR) performance for the reception of data packets transmitted in the form of symbols modulated onto a signal. More particularly, apparatus and methods are disclosed for detecting the preamble and symbol boundaries of received data packets encoded with OFDM and other multi-carrier symbol transmission systems. Also disclosed are combinations of sensitive preamble detection and data payload and/or signal field encoding methods to spread data redundantly, to improve reception under a low SNR condition.

7277517, Oct 2, 2007

Nov 15, 2002

10/298130

Timothy F. Murphy - Ramona CA, US
Martin Staszak - Poway CA, US

3Com Corporation - Marlborough MA

H04L 7/00, H04L 25/00, H04L 25/40

375371

A method for determining symbol boundaries in an ADSL modem, comprising receiving multi-frequency modulated signals in the time domain, wherein the multi-frequency modulated signals include a pilot signal at a pilot frequency. Performing a time-to-frequency transform on the multi-frequency modulated signals to recover the pilot signal. Iteratively computing a phase error for the pilot signal over a number of transform regions. Selecting the transform region with the lowest phase error.

7548579, Jun 16, 2009

Mar 31, 2003

10/403546

Timothy F. Murphy - Ramona CA, US
Niels Van Erven - Sunnyvale CA, US

3Com Corporation - Marlborough MA

H04B 1/00

375147

A wired or wireless signal transmitter or receiver and methods providing improved signal-to-noise ratio (SNR) performance for the reception of data packets transmitted in the form of symbols modulated onto a signal. More particularly, apparatus and methods are disclosed for detecting the preamble and symbol boundaries of received data packets encoded with OFDM and other multi-carrier symbol transmission systems. Also disclosed are combinations of sensitive preamble detection and data payload and/or signal field encoding methods to spread data redundantly, to improve reception under a low SNR condition. This invention may be applied to a variety of standards utilizing OFDM and similar technologies, including IEEE 802. 11a, Hiperlan/2 and MMAC.