Active system and method for remotely identifying RF broadcast stations
Patent 5819155 Issued on October 6, 1998. Estimated Expiration Date: 
November 20, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 20, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2552585 2896070 3126513 3434150 3456192 3800223 Survey of radio audience System method for identifying radio stations to which tuners are tuned Technique for surveying a radio or a television audience System and method for identifying radio stations to which tuners are tuned InventorsAssigneeApplicationNo. 749776 filed on 11/20/1996US Classes:455/2.01AUDIENCE SURVEY OR PROGRAM DISTRIBUTION USE ACCOUNTINGExaminersPrimary: Faile, AndrewAssistant: Le, Uyen Attorney, Agent or FirmInternational ClassH04B 017/00AbstractA survey electronics package (32) of a survey system (10) includes a transmitter (36) and a receiver (38). The transmitter (36) transmits a survey signal which a radio (12) residing in a detection zone (14) receives and demodulates to generate an audio echo signal. The audio echo signal is magnetically radiated from a speaker (26) of the radio (12). The receiver (38) magnetically senses this magnetically radiated audio echo signal. A bandpass filter (48) in the receiver (38) and a correlation process (86) insure that only a valid audio echo signal is recorded. When the detection of a valid audio echo signal corresponds to a radio (12) tuned to a particular radio station, a record is made of the detection. | |
