Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Reexamination Certificate
2006-04-18
2006-04-18
Kuntz, Curtis (Department: 2643)
Telephonic communications
Substation or terminal circuitry
For loudspeaking terminal
C379S388020
Reexamination Certificate
active
07031455
ABSTRACT:
A speakerphone incorporates a portion defining a loudspeaker cavity, the cavity containing a loudspeaker. The speakerphone also includes a handset with an internal microphone in the handset. The speakerphone has a housing adapted to receive the handset, and when it is thus received, the handset microphone is acoustically coupled to the loudspeaker cavity, allowing the handset microphone signal to be used to control feed-back or feed-forward algorithms that enhance the performance of the speakerphone.
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Mingsian R. Bai and Hsinping Wu, “Robust Control of a Sensorless Bass-Enhanced Moving-Coil Loudspeaker System”, The Journal of the Acoustical Society of America, vol./Issue: 105, Jun. 1999, pp. 3283-3289.
Gancarcik Ed
Moquin Philippe
Jamal Alexander
Jones Day
Kuntz Curtis
Mitel Networks Corporation
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