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Audio Patch Method in MPEG-4 HE AAC Decoder

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This paper extends the previous work on AAC to the HE-AAC. The audio path method consists of two individual parts, zero band dithering and high frequency reconstruction. The zero band dithering can conceal the fishy artifact in the low frequency part that is encoded by a convention AAC encoder. Furthermore, high frequency reconstruction can extend the audio obtained from the SBR to a full bandwidth signal. Intensive experiments have been conducted on various audio tracks to check the quality improvement and the possible risks in degrading the quality. The objective test measures used is the recommendation system by ITU-R Task Group 10/4.

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