发明名称 |
Audience survey system |
摘要 |
An incasting system which makes possible an interactive participative broadcasting system is described. A plurality of incasting signal generators are each located at respective ones of a plurality of sources which are connected to a central sink via respective communication paths. Detector means located at the central sink are each responsive to the signal which may appear on any one of a plurality of the communication paths.
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申请公布号 |
US3909536(A) |
申请公布日期 |
1975.09.30 |
申请号 |
US19740467267 |
申请日期 |
1974.05.06 |
申请人 |
NORTHERN ELECTRIC COMPANY LIMITED |
发明人 |
WATSON, DOUGLAS JOHN;PARKINSON, PETER |
分类号 |
H04M11/06;(IPC1-7):H04M11/06 |
主分类号 |
H04M11/06 |
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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