Motorola Corporation

Motorola Solutions, Inc.

Dang N Vu

Branko L Avanic

Wayne M Phang

Joseph J Medvid, Iii

Charles R Ruelke

Ellis Arthur Pinder

Joseph P Heck

Armando J Gonzalez

Richard S Young

John K McKinney

Mahes M Ekanayake

Lorenzo J Cruger

Hiep T Dang

Kevin D Walkup

Shakeeb Z Khan

Tan V Dinh

Joseph J Medvid

Methods of enabling late entry into an on-going spread spectrum call are described. A late join frame replaces, and has the same size as, a traffic frame. A late join slot in the late join frame contains sufficient information in preamble and sync subframes to permit a target to join the call. The traffic slots in the late join frame replicate data such that call quality of the call is substantially unaffected if one of the remaining traffic frames is not received. The preamble and sync subframes frequencies may be the same as, or different from, preamble and sync frames frequencies during a call establishment phase of the call. If different, the preamble and sync subframes frequencies are selected from one or more frequencies. Use of the preamble and sync subframes frequencies is compensated for when selecting the traffic slot frequencies to obtain uniform utilization of the spectrum.

Method to facilitate late joining of a call

A communication device () includes a cordless telephone () and a two way radio (). The communication device () is adapted to place an active cordless telephone call in a low frequency mode in response to receiving an incoming two way radio communication. The communication device () is adapted to then establish communication within the two way radio communication. The communication device () periodically re-establishes the cordless telephone call to maintain communication with a cordless base station () until the two way radio communication is completed.

Communication device and method of operation therefore

A receiver ( ) includes an antenna ( ), a preselector ( ), an amplifier ( ), a mixer ( ), a filter ( ), a signal strength measurement circuit ( ), a radio frequency signal detector ( ), and a processor ( ). The processor ( ) is programmed to receive a signal indicator level ( ) from the signal strength measurement circuit ( ), generate an automatic gain control command ( ) based on the received signal indicator level ( ), and send the automatic gain control command ( ) to the amplifier ( ) to control a gain of the amplifier ( ). The processor ( ) is programmed to receive an off channel signal strength ( ) from the radio frequency signal detector ( ), compare the off channel signal strength ( ) to one or more threshold levels, generate a filter command ( ), and send the filter command ( ) to the filter ( ). The filter command ( ) identifies a cutoff frequency for the filter ( ).

Receiver for audio enhancement and method therefor

A receiver ( ) uses a scanning technique ( ) to minimize scan time. An initial bandwidth setting is selected that covers multiple channel frequencies ( ). A signal detection step ( ) is performed looking for channel activity. As channel activity is detected, the bandwidth of a baseband filter ( ) is narrowed ( ). The radio remains programmed to the same channel while the bandwidth is varied. Once the last signal detection with the narrowest possible bandwidth setting has been determined ( ) the radio is programmed to that channel. Thus, more than one channel frequency is capable of being scanned without reprogramming the radio to a new channel for each scan.

Method for reducing scan time in a radio receiver

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Parkland, FL, United States of America

Dang N Vu