发明名称 |
TRANSMISSION SYSTEM WITH IMPROVED TONE DETECTION TRANSMISSION SYSTEM WITH IMPROVED TONE DETECTION |
摘要 |
In a transmission system, a signalling tone is transmitted by a transmitter to a receiver via a transmission channel. In the receiver, a tone detector detects the presence of a signalling tone. In order to improve a reliability of the tone detector, a number of correlating elements which determine a correlation value between an input signal and a reference signal are used. Absolute output signals of the correlating elements are added by an adder to derive a combined correlation signal to be used for detection. |
申请公布号 |
WO9633581(A3) |
申请公布日期 |
1997.01.09 |
申请号 |
WO1996IB00296 |
申请日期 |
1996.04.10 |
申请人 |
PHILIPS ELECTRONICS N.V.;PHILIPS NORDEN AB;PIJNENBURG BEHEER N.V. |
发明人 |
BRAAMS, HARM;MOERMAN, CORNELIS, MARINUS |
分类号 |
H04L27/00;H04B1/10;H04Q1/44;H04Q1/448;H04Q1/48 |
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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