| 摘要 |
A system for economically recording information indicating radio stations listened to on a radio is disclosed which analyzes listening habits in a relatively short fundamental time period to determine if within that fundamental time period a particular station was tuned for at least a substantial time period within that fundamental time period. If this criteria is met, the system records the station in a solid state data location. Ratings are determined by the number of data locations each station is stored in over a particular interval.
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