Maginot, Addison & Moore
Method and apparatus for measuring a radio frequency signal having program information and control information
 Disclosed are method and apparatus which measure signal level of an RF signal. The measured RF signal includes a baseband signal modulated onto a first carrier signal having a first frequency and the baseband signal includes program information and control information. The method and apparatus digitize the RF signal which includes the baseband control information and determine a signal level measurement from the baseband control information in the digitized RF signal. Furthermore, method and apparatus are disclosed which determine from the digitized RF signal whether a tagging signal is present in the RF signal. 
Wavetek Corporation
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Qin Andrew E. Pingnan
Zhang Bowyer Shi