| 发明名称 |
Automatic handset-speakerphone switching arrangement for portable communication device. |
| 摘要 |
<p>A personal communicator handset (102) is designed to operate as both a handset and as a speakerphone and to automatically switch between the two modes based on distance between the handset and the user's ear (100). This distance is determined by an infrared range detection unit (501, 503, 506-509) built into the handset. <IMAGE></p> |
| 申请公布号 |
EP0564160(A2) |
申请公布日期 |
1993.10.06 |
| 申请号 |
EP19930302274 |
申请日期 |
1993.03.25 |
| 申请人 |
AMERICAN TELEPHONE AND TELEGRAPH COMPANY |
发明人 |
BOWEN, DONALD JOHN;ERVING, RICHARD HENRY;MILLER II, ROBERT RAYMOND |
| 分类号 |
H04M1/60 |
主分类号 |
H04M1/60 |
| 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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