发明名称 |
Transmission system with improved tone detection |
摘要 |
In a transmission system, a tone is transmitted by a transmitter to a receiver via a transmission channel. In the receiver, a tone detector is used to detect the presence of a signalling tone. In order to improve a reliability of the tone detector when the arrival of the signalling tone is unknown, a number of correlators having mutually displaced measuring periods are used. More than two correlators are used in order to reduce the measuring period, also resulting in an improved reliability of the tone detection.
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申请公布号 |
US5850438(A) |
申请公布日期 |
1998.12.15 |
申请号 |
US19960632937 |
申请日期 |
1996.04.16 |
申请人 |
U.S. PHILIPS CORPORATION |
发明人 |
BRAAMS, HARM;MOERMAN, CORNELIS M. |
分类号 |
H04L27/00;H04Q1/44;H04Q1/448;(IPC1-7):H04M1/00 |
主分类号 |
H04L27/00 |
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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