发明名称 |
TELEFONE SENZA CORDONE CONTROLLATO DA CALCOLATORE |
摘要 |
<p>A computer-controlled cordless telephone system having a base unit and a handset unit provides for increased functionality in communications between the base unit and the handset unit, and also provides a controlled power-up/power-down mode of operation for the handset unit. Increased functionality is achieved by employing a message format for control signals transmitted between the base unit and the handset unit in the form of frequency shift keyed (FSK) signals which include a data field. This data field may be in the form of either opcode data or digit data, thereby allowing for many different commands or functions. Power to a computer, a receiver and certain other selected circuitry in the handset unit is controlled to minimize power consumption when the handset unit is in an out-of-cradle-and-standby state. Power to other nonessential circuitry in the handset unit is turned completely off during this state. The handset unit automatically turns on to a full operating mode from the alternating power-up/power-down mode in response to events such as (1) a user depressing a key no the keypad of the handset unit for either initiating a telephone calls or paging the base unit, and (2) the base unit detecting an incoming ringing signal on the telephone lines.</p> |
申请公布号 |
IT1202566(B) |
申请公布日期 |
1989.02.09 |
申请号 |
IT19870019425 |
申请日期 |
1987.02.19 |
申请人 |
AMERICAN THELEPHONE & TELEGRAPH CO. |
发明人 |
BECKER WILLIAM RICHARD;BOYD JAMES JOSEPH III;CLIFFORD WILLIAM JOSEPH;NEWLAND PAUL BENJAMIN |
分类号 |
H04B7/26;H04M1/73;H04W52/02;(IPC1-7):H04M/ |
主分类号 |
H04B7/26 |
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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