Current audio encoders like MP3 or AAC leads to some artifacts due to the bit rate constraint. This paper considers two artifacts. The first artifact is the unusual spectral valley which is perceptually heard as fishy noise. The second one is the spectrum clipping which leads to the muffling audio. This paper proposes the spectrum patch method to handle the two artifacts in the decoders. The technique can be included in MPEG1? Layer3 and MPEG4?AAC (Advanced Audio Coding) decoders to conceal the artifacts without prior information on the original audio tracks. Intensive experiments have been conducted on various encoders and 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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