Mark A Stubbs

US Patent:

6414968, Jul 2, 2002

Filed:

Oct 30, 1998

Appl. No.:

09/183565

Inventors:

Philip H. Sutterlin - Saratoga CA
Walter J. Downey - Los Gatos CA
Mark Adrian Stubbs - Felton CA
Luna Chen - Mountain View CA

Assignee:

Echelon Corporation - San Jose CA

International Classification:

H04M 1104

US Classification:

370480, 34031002, 375260

Abstract:

A dual channel transceiver which operates at two different frequencies and which may be used in a network using older transceivers operating at a single frequency is disclosed. A pilot tone is transmitted by the transceiver when it is using the second channel to cause the older transfers to remain synchronized and thereby prevent them from transmitting data which would otherwise interfere with the data on the second channel. The relative magnitude of the signals on both channels is compared to prevent the detection of cross-talk on the second channel as data.

US Patent:

6442381, Aug 27, 2002

Filed:

Oct 30, 1998

Appl. No.:

09/183588

Inventors:

Walter J. Downey - Los Gatos CA
Mark Adrian Stubbs - Felton CA
Luna Chen - Mountain View CA
Philip H. Sutterlin - Saratoga CA

Assignee:

Echelon Corporation - San Jose CA

International Classification:

H04B 110

US Classification:

455265, 455318, 335346

Abstract:

A method and apparatus for defining and generating a digital waveform such as used for the local oscillator for a down converter in a receiver is disclosed. The method and apparatus is particularly useful where the digital waveform is not an integer submultiple of a reference signal. A plurality of different digital waveforms meeting the timing criteria but having different combinations of segments needed to meet the timing criteria are generated. Each of the digital waveforms so generated are tested in, for instance, a receiver to enable the selection of the best combination of segments.

US Patent:

6484018, Nov 19, 2002

Filed:

Jan 25, 2001

Appl. No.:

09/770409

Inventors:

Walter J. Downey - Los Gatos CA
Mark Adrian Stubbs - Felton CA
Luna Chen - Mountain View CA
Philip H. Sutterlin - Saratoga CA

Assignee:

Echleon Corporation - San Jose CA

International Classification:

H04B 126

US Classification:

455318, 455313, 455319, 455324, 455255, 375340, 34031001

Abstract:

A method and apparatus for defining and generating a digital waveform such as used for the local oscillator for a down converter in a receiver is disclosed. The method and apparatus is particularly useful where the digital waveform is not an integer submultiple of a reference signal. A plurality of different digital waveforms meeting the timing criteria but having different combinations of segments needed to meet the timing criteria are generated. Each of the digital waveforms so generated are tested in, for instance, a receiver to enable the selection of the best combination of segments.

US Patent:

62956256, Sep 25, 2001

Filed:

Jan 27, 1999

Appl. No.:

9/239032

Inventors:

Walter J. Downey - Los Gatos CA
Mark A. Stubbs - Felton CA
Philip H. Sutterlin - Saratoga CA
Luna Chen - Mountain View CA

Assignee:

Echelon Corporation - Sunnyvale CA

International Classification:

H03M 1345

US Classification:

714780

Abstract:

A "hint" signal is developed which points to suspected erroneous bits in received data by examining anomalies in the signal. More particularly, a delta phase pointer which quantifies one of the anomalies is used. The realigning of an IQ pointer provides an additional anomaly which is prioritized along with the delta phase pointer. The particular error correcting code used for the power line application provides seven check bits for a data byte and permits the correction of up to two errors. A third error is correctable through use of the hint signal and a parity bit.

US Patent:

57872643, Jul 28, 1998

Filed:

May 8, 1995

Appl. No.:

8/437233

Inventors:

Kevin M. Christiansen - Saratoga CA
Mark A. Stubbs - Felton CA
Bruce Eckstein - Cupertino CA

Assignee:

Apple Computer, Inc. - Cupertino CA

International Classification:

H01J 1300

US Classification:

395293

Abstract:

The present invention is directed to providing a computer system which arbitrates control of a shared bus among plural devices included in the computer system. In accordance with the present invention, at least one of the devices is afforded a higher priority than the remaining devices, yet none of the remaining devices are effectively denied system bus access or control for extended periods of time. The present invention can therefore increase operating efficiency even as the number of devices included in the computer system is increased to achieve enhanced processing power. In addition, the present invention can provide sophisticated multimedia features, including real time signal processing, without sacrificing overall operating efficiency. In accordance with the present invention, the plural devices arbitrate system bus control in a manner which achieves acceptable multimedia results when processing real time data streams such as video data streams, audio data streams, animation data streams, and so forth, yet which does not sacrifice the access of remaining devices in the computer system to the shared bus.

US Patent:

59833025, Nov 9, 1999

Filed:

Jun 25, 1998

Appl. No.:

9/104401

Inventors:

Kevin M. Christiansen - Saratoga CA
Mark A. Stubbs - Felton CA
Bruce Eckstein - Cupertino CA

Assignee:

Apple Comptuer, Inc. - Cupertino CA

International Classification:

G06F 1314

US Classification:

710113

Abstract:

The present invention is directed to providing a computer system which arbitrates control of a shared bus among plural devices included in the computer system. In accordance with the present invention, at least one of the devices is afforded a higher priority than the remaining devices, yet none of the remaining devices are effectively denied system bus access or control for extended periods of time. The present invention can therefore increase operating efficiency even as the number of devices included in the computer system is increased to achieve enhanced processing power. In addition, the present invention can provide sophisticated multimedia features, including real time signal processing, without sacrificing overall operating efficiency. In accordance with the present invention, the plural devices arbitrate system bus control in a manner which achieves acceptable multimedia results when processing real time data streams such as video data streams, audio data streams, animation data streams, and so forth, yet which does not sacrifice the access of remaining devices in the computer system to the shared bus.