发明名称 |
Handset with a single transducer for handset and handsfree functionality |
摘要 |
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.
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申请公布号 |
US6002949(A) |
申请公布日期 |
1999.12.14 |
申请号 |
US19970972355 |
申请日期 |
1997.11.18 |
申请人 |
NORTEL NETWORKS CORPORATION |
发明人 |
HAWKER, LARRY EDWARD;VAN SCHYNDEL, ANDRE JOHN;FORRESTER, CHRISTOPHER MICHAEL |
分类号 |
H04M1/02;H04M1/03;H04M1/60;(IPC1-7):H04Q7/32 |
主分类号 |
H04M1/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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