Harris Corporation

Ericsson Gmbh

David William Brown

Joseph J Milhorn

Mac Lamar Hartless

John V Hughes

David P Cullen

Darryl W Royster

An enhanced bypass mode simulcast radio communication system () includes a plurality of transmit/receive (T/R) sites () configured to participate in a simulcasting communication session responsive to a control point system (). A site controller () is responsive to determination of a timing malfunction at a first one of the T/R sites. In response, the site controller is configured to automatically terminate participation of the malfunctioning T/R site in the simulcasting communication session and perform further actions to cause the malfunctioning site to transition to a multisite mode of operation involving a network switching center (). The simulcast system automatically adjusts its site timing to compensate for the loss of the T/R site in bypass.

Enhanced bypass operation in simulcast radio communication system

Simulcast communication network () includes a first transmit/receive (T/R) site () that functions as control point. At least one processing device () is communicatively coupled to the simulcast communication network. The at least one processing device is responsive to a determination that the first T/R site has experienced at least one fault to initiate a dynamic control point arbitration (DCPA) session. The DCPA session includes automatically selecting one of a plurality of second T/R site () to function as the control point in place of the first T/R site and automatically re-configuring of the simulcast communication network to cause the selected one of the plurality of second T/R sites to function as the new control point.

Dynamic control point in simulcast radio communication system

These and other objects of the present invention are achieved using an Adaptive Multi-Path Filter (AMPF) which eliminates audibly objectionable click noise generated at the output of an FM discriminator to prevent audible distortion or other corruption of the desired signal which may include voice and low speed digital data. Clicks are detected at the discriminator output using a colored-noise, matched filter designed and adapted to the click signature/shape as well as to the desired signal characteristics. The colored-noise matched, filter output is then compared to an adaptive threshold. When the threshold is exceeded, a click is registered as detected. Click duration is then estimated. An estimate of the desired signal is generated and that replaces the originally received data signal estimate within the click duration region. Using characteristics of the desired signal just before and after the detected click noise, the adaptive filter accurately estimates the parameters of the desired signal so that the replacement signal fairly models what the desired signal would have looked like had the click not occurred. In this way, a substantial portion of the desired signal is preserved.

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Concord, VA, United States of America

David William Brown