Handset with a single transducer for handset and handsfree funct

Details Handset with a single transducer for handset and handsfree funct Handset with a single transducer for handset and handsfree funct

1997-11-18

1999-12-14

Chin, Wellington

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455 90, 455575, 361814, 379420, 379428, 379433, H04Q 732

Patent

active

060029498

ABSTRACT:
A wireless terminal for personal communication systems is provided with handsfree and handset receive modes of operation utilizing a single transducer. The transducer is mounted within a specially designed enclosure having front and back chambers separated by a partition. The partition contains strategically located internal vents and the front chamber contains strategically located acoustic ports for shaping the frequency response and providing good audio quality in each mode. The back chamber may also contain strategically located acoustic ports. Amplification and equalization circuitry may be employed to further adjust the amplifier gain and shape the frequency response for dual mode operation. The terminal may additionally be equipped with a proximity detector to assist in switching between operating modes of operation. The transducer may also be used to generate the alerting (ringing or buzzing) signal.

REFERENCES:
patent: 5276916 (1994-01-01), Pawlish et al.
patent: 5402486 (1995-03-01), Wang et al.
patent: 5588041 (1996-12-01), Meyer, Jr. et al.
patent: 5610971 (1997-03-01), Vandivier
patent: 5642402 (1997-06-01), Vilmi et al.
patent: 5664012 (1997-09-01), Chen
patent: 5664015 (1997-09-01), Ford et al.
patent: 5729604 (1998-03-01), Van Schyndel
patent: 5749057 (1998-05-01), Takagi
patent: 5778061 (1994-11-01), Parment et al.
patent: 5790679 (1996-06-01), Hawker et al.

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