System and method for compressed domain beat detection in...

Data processing: speech signal processing – linguistics – language – Audio signal time compression or expansion

Reexamination Certificate

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C704S200100, C704S204000, C381S056000, C434S262000, C382S240000, C382S107000

Reexamination Certificate

active

07050980

ABSTRACT:
A system and method for detecting beats in a compressed audio domain is disclosed where a beat detector functions as part of an error concealment system in an audio decoding section used in audio information transfer and audio download-streaming system terminal devices such as mobile phones. The beat detector includes a MDCT coefficient extractor, a band feature value analyzer, a confidence score calculator; and a converging and storage unit. The method provides beat detection by means of beat information obtained using both MDCT coefficients as well as window-switching information. A baseline beat position is determined using MDCT coefficients obtained from the audio bitstream which also provides a window-switching pattern. A window-switching beat position is compared with the baseline beat position and, if a predetermined condition is satisfied, the window-switching beat position is validated as a detected beat.

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