A comparative study of transforms for use in digital audio data compression [letter]

Author(s): Shaw, M. F., Donohue, K. D.

Journal/Book: J Acoust Soc Am. 2000; 108: 449-52.

Abstract: This paper provides a subjective quality analysis of transforms used in audio compression algorithms for a class of music signals. A 34-subject listener test compares three transforms in conjunction with an MPEG I layer 1 compression scheme. One test compares the performances of the discrete wavelet packet transform (DWPT) and the modified discrete cosine transform (MDCT) used in MPEG. Another test compares the performances of a DWPT eight-level nonuniform critical-band split and a DWPT five-level uniform subband split. Results indicate that the critical-band split provides significantly better quality than the uniform subband split for sounds with tonal and strong low-frequency content, while the DWPT outperforms the MDCT with significant improvement for nontonal sounds.

Keyword(s): Algorithms. Human. Music. Signal Processing, Computer-Assisted

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