Novel Audio Mosaic Using LPC-Coefficient and Excitation-Codeword Permutations

• Published in: IEEE signal processing letters Vol. 31; pp. 1 - 5
• Main Authors: Tsai, Morris C.-H., Wu, Hsiao-Chun, Huang, Scott C.-H., Chang, Shih Yu
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.01.2024; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Audio mosaic; Codec; Discrete cosine transform; Discrete cosine transforms; Encryption; Kullback-Leibler divergence of discrete cosine transform (DCT-KLD); Linear predictive coding; linear predictive coding (LPC); Permutations; Polynomials; Receivers; Sociology; Statistics; Waveforms
• ISSN: 1070-9908; 1558-2361
• DOI: 10.1109/LSP.2024.3417328

In this letter, a novel light-weight audio mosaic scheme using permutations of linear predictive coding (LPC) coefficients as LPC has been widely adopted in many audio codecs (coder-encoders) nowadays. We establish the theoretical secrecy analysis with respect to the degree of the original LPC polynomial and the minimum-phase population of permuted LPC polynomials. The mosaic (destructuring) performance in terms of DCT-KLD (Kullback-Leibler divergence of discrete cosine transform) is also evaluated through simulations. In comparison with the existing audio-mosaic method using waveform permutations, our proposed new audio-mosaic scheme using LPC-coefficient permutations can achieve a much better mosaic performance (a much higher DCT-KLD) subject to the same key size.