Telecommunications – Audience survey or program distribution use accounting
Patent
1986-08-05
1988-02-02
Ng, Jin F.
Telecommunications
Audience survey or program distribution use accounting
455161, 455186, 455226, 358 84, H04B 1700
Patent
active
047233028
ABSTRACT:
A method and apparatus for identifying a channel to which a receiver is tuned sequentially detects a signal of the receiver and stores a characteristic value of the detected signal for a predefined sequence of frequencies. The stored values corresponding to the predetermined channels of the receiver are identified and assigned a predetermined value. The stored values corresponding to each of a plurality of harmonic frequencies of the predetermined channels are identified and assigned one of a plurality of different predetermined values. A total assigned value is then calculated for each of the predetermined channels with the corresponding values for the identified harmonic frequencies thereof. The calculated total values are then compared to identify a maximum value corresponding to the channel to which the receiver is tuned.
REFERENCES:
patent: 3864636 (1975-02-01), Fukuda et al.
patent: 4020419 (1977-04-01), Caspari et al.
patent: 4044376 (1977-08-01), Porter
patent: 4216497 (1980-08-01), Ishmen et al.
patent: 4425578 (1984-01-01), Haselwood et al.
patent: 4577220 (1986-03-01), Laxton et al.
Frett Kenneth J.
Fulmer Allen L.
A. C. Nielsen Company
Ng Jin F.
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