Motorola Corporation

James W Dejmek

Ronald A Craig

Michael K Alwine

A diversity repeater that incorporates diversity diagnostic circuitry. The diversity diagnostic circuitry monitors the outputs of at least two receivers and determines the signal strength of the transmissions received by each receiver. If the signal strength for a particular receiver is below a predetermined threshold, the diversity diagnostic circuitry determines whether that receiver is receiving a rayleigh faded transmission or is an inoperative mode.

Diversity repeater diagnostic method and apparatus

A method and device are set forth for providing improved diversity reception to a receiver system in a communication system, the receiver system having at least one receiver on each of at least a first and a second receiver branch. The method and device provide, upon receipt of signals on the receiver branches, for utilizing received signal strength voltages to determine control voltage values, utilizing the control voltage values to amplify the designated signal (the designated signal being, for example, a signal having a received signal strength (RSSI) greater than a predetermined threshold) to obtain an amplified designated signal, and generating a resultant signal in view of the at least first amplified designated signal. The control voltage values are utilized to obtain at least one weighted difference. The at least one weighted difference is utilized to obtain an adjusted amplification of the at least one designated signal in accordance with a linear approximation. Amplified designated signals are combined to obtain the resultant signal.

Linear weighting method and device for diversity reception

A method and device are set forth for providing an improved audio waveform correction in a postdetection circuit in a radio frequency communication system. A device is described that utilizes at least two voltage-controlled resistors, at least three operational amplifiers, and selected resistors, as desired, to adjust amplification, as desired, of at least a first received audio signal with respect to at least a first input control voltage to obtain an adjusted first received audio signal, and combines the adjusted first received audio signal with an at least first voltage-selected waveform to provide an at least first corrected audio signal.

Method and device for audio waveform correction in a RF communication

Accelerated throughput of voice messages is accomplished by first filtering a normal 50-3000 Hz voice signal to a reduced bandwidth 350-1650 Hz (with loss of identifying features), the reduced signal then accelerated X3 and translated downward to bandwidth 50-3950 Hz for transmission. The receiver recovers the 350-1650 Hz signal.

Growing community of inventors

Lombard, IL, United States of America

James W Dejmek