The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 02, 2002
Filed:
May. 24, 1999
James Brian Piket, Gilbert, AZ (US);
Lance Foreman Amos, Mesa, AZ (US);
Holly Elizabeth Hall, Chandler, AZ (US);
William Chunhung Yip, Phoenix, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
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.