Motorola Corporation

Lance Foreman Amos

William Chunhung Yip

James Brian Piket

Holly Elizabeth Hall

A hands-free communications unit employs a downlink peak power memory element ( , FIG. ), a downlink voice activity detector ( ), and an uplink voice activity detector ( ). The downlink voice activity detector ( ) evaluates the incoming signal to determine if the signal includes voice. In a similar manner, the uplink voice activity detector ( ) determines if an outgoing signal includes voice. In the event that the incoming signal includes voice and the energy of the outgoing signal exceeds a threshold calculated from the peak power of the incoming signal, the uplink voice activity detector ( ) indicates that a double-talk condition exists ( , FIG. ). In the event that the incoming signal does not include voice, the uplink voice activity detector ( ) compares the uplink signal to a voice threshold above a noise floor to determine if the outgoing signal includes voice.

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Mesa, AZ, United States of America

Lance Foreman Amos