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Quality Improvement Using a Sinusoidal Model in HE-AAC

In Spectral Band Replication (SBR), a tone is often restored as a noise, which results in audible distortion. In this paper, we propose an efficient way of restoring the original tones using SBR. In the proposed algorithm, the tones are identified through a sinusoidal modeling and their frequencies are adjusted within the QMF band in order to reduce the noise floor. The proposed algorithm is perfectly compatible to the standard High-Efficiency AAC (HE-AAC) because it doesn¢¢ç¯t require additional information or operations in the decoding process. Output spectrograms were compared and listening tests were conducted to evaluate the proposed algorithm. Results confirmed the effectiveness of the proposed algorithm.

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