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Frequency Shift Method for MP3 Audio Data by Modifying Inputs of IMDCT

Adjusting the playing speed and signal pitch of an audio signal in a compressed representation, such as MP3, presents special challenges. The proposed approach modifies the input of the inverse modified discrete cosine transform in the process of MP3 decoding. The method provides a high-quality frequency shift from the mathematical model, which can extract the frequency, amplitude, and phase of the frequency components located at subband boundaries. Using the extracted information, frequency shifts were made and the performance of the proposed method was analyzed and compared with other methods by quantitative and subject tests. For a subjective analysis, the MOS test with five professional musicians was carried out. The subjects generally gave the result a score of 4. The proposed method has a computation complexity of approximately 43% of the synchronized overlap-add algorithm for MP3 music, which is known as a simple frequency-shift algorithm.


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