DENNIS EDWARD BURKE
Pilots at Crown Rd, Elmhurst, IL

5148449, Sep 15, 1992

May 26, 1989

7/358295

Gary A. Cannalte - Hoffman Estates IL
Dennis E. Burke - Elmhurst IL

Motorola, Inc. - Schaumburg IL

H04L 2506

375 76

There is provided a scheme for centering data prior to detection. It comprises: determining carrier frequency error, and pre-adjusting the data detection process to compensate for that error throughout the ensuing data detection. This scheme for reliable multi-level data detection further comprises: upon detection of carrier presence, determining carrier frequency error, gating a voltage associated with the frequency error to the differential amplification process to establish common mode rejection and compensating for that error throughout the ensuing multi-level data detection, and then analog-to-digital conversion of the differentially amplified multi-level data. A scheme for computationally centering the subsequent data detected to compensate for the error is also provided.

5471471, Nov 28, 1995

Jan 3, 1992

7/817023

Thomas A. Freeburg - Arlington Heights IL
Dennis E. Burke - Elmhurst IL
Paul Odlyzko - Arlington Heights IL

Motorola, Inc. - Schaumburg IL

H04B 700, H04J 312

370 79

A communications system having a plurality of different radio-types (528, 530 and 532) when integrated into a single node or control module (500) provides communications with a plurality of different end users (502, 506 and 508) having different transmission protocols. The steps involved comprise coupling the plurality of communication devices (528, 530 and 532) together via a bus (526) and coupling at least one processing unit (517) to the bus (526). Signals received by RF devices (528, 530 and 532) are communicated onto the bus (526) and processed by the processing unit (517) into processed signals. Processed signals comprise data and control information which are stored in memory (522). Thereafter, the processed signals stored in memory (522) are returned back onto the bus (526) for use by at least one of the plurality of communication devices (528, 530 and 532).

5053717, Oct 1, 1991

Nov 13, 1989

7/434746

Gary D. Schulz - Mount Prospect IL
Dennis E. Burke - Elmhurst IL

Motorola, Inc. - Schaumburg IL

H03D 300, H03D 306

329300

An improved multilevel FSK demodulator, according to the invention, is provided that down-converts the IF frequency back to baseband quadrature via dual mixers. The improved multilevel FSK demodulator uses controllable time-delay in the demodulation process. This method requires a 90. degree. phase difference between 2 modulated signals to produce a maximum demodulated output amplitude at the maximum frequency deviation. Since the IF frequencies have been down-converted back to baseband quadrature, these 2 signals are only "out of phase" by an amount. DELTA. t that is equal to 90. degree. /d. omega. A further aspect of this invention addresses minimizing the DC offset from the demodulator by providing a feedback signal which controls the amount of delay provided to one of the quadrature signals.

4987374, Jan 22, 1991

Oct 5, 1989

7/417375

Dennis E. Burke - Elmhurst IL

H03D 300

329302

An improved multilevel FSK demodulator, according to the invention, is provided that down-converts the IF frequency back to baseband quadrature via dual mixers. The improved multilevel FSK demodulator uses time-delay demodulation. This method requires a. +-. 90. degree. phase difference between 2 modulated signals to produce a maximum demodulated output amplitude at the maximum frequency deviation. Since the IF frequencies have been down-converted back to baseband quadrature, these 2 signals are only "out of phase" by an amount. DELTA. t that is equal to 90. degree. /d. omega. For a. DELTA. omega. of 4 MHz, this gives a. DELTA. t=62. 5 nonoseconds. As a result, it is easy to achieve a delay line using multiple tap positions for 62. 5 nonoseconds total delay.