Abstract
A general surveying system for audience rating based on audio information are introduced. In this system, the audio signal is sampled from the audio outlet of TV set and high compressed into a special digital package which includes watching timing, audio signal features, and the marks of the TV channel switching. The packaged audio features are high robustness for different types of television sets and different audio volume and have no disturbance of surroundings. In the channel retrieval algorithm, multi-thresholds are used for calculating the correlation coefficients of audio features and matching the audio pattern, and the second searching is adopted for combining match when the retrieved TV channel of the head package is different from the one of the end package. The simulation test results show that the audio recognition rate is above 93%, and for other audios without the TV standard channels can be detected steadily. Keywords: audience rating; audio retrieval; robustness; recognition rate
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