Motorola Corporation

Bruce Edward Geren

William Chunhung Yip

James Brian Piket

Mark R FitzGerald

Edward P Katarski

Richard James Weston

Donald Fong Gee

An echo canceller (500) utilizes a central control unit (502) (CCU) and at least one convolution processing unit (504) (CPU) to perform echo cancellation on one or more channels. A method for operating the echo canceller (500) controls reading (706) one or more reference signals (510) and reflected signals (512), convolution and adaptive processing (11, 21, 31, 41) using the CPUs (504), and post-processing (702) to produce one or more echo cancelled signals (514). Convolution and adaptive processing for multiple channels can be performed simultaneously (11, 31) by multiple CPUs (504), or in a time-multiplexed manner (11, 21) by a single CPU (504), or a combination (11, 21, 31, 41) of simultaneous and time-multiplexing by multiple CPUs (504). CCU (502) is able to perform processing functions (702-730) while CPUs (504) perform convolution and adaptive processing (11, 21, 31, 41).

Multi-channel echo cancellation method and apparatus

An automatic vehicle location system (10) includes a radio positioning system receiver (14) which receives GPS radio signals (18) and includes a two-gimbaled gyroscope (22), which is used by a dead-reckoning positioning system. A controller (43) determines position based upon the radio positioning system when the radio signals (18) are available and upon dead-reckoning when the radio signals (18) are not available. The dead-reckoning process is based upon a compensation factor which is established in response to data received from the radio positioning system (14). The compensation factor acts as an adjustment to an inner gimbal angle to compensate for a minor drift away from level by the inner gimbal (32).

Dual positioning location system

Non-pyrotechnic cues are used with an area weapons effects system. These cues include sound devices, flashing lights and smoke deposition devices. A processor detects the required type of display from an input message and displays an appropriate sound to correspond to the type of weapon used. In addition, visual displays are coordinated with the audio display to provide simulated explosions with appropriate sounds ('bangs') and lights ('flashing lights') and smoke.

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Chandler, AZ, United States of America

Bruce Edward Geren