Title :
A new hybrid LPC-DWT algorithm for high quality audio coding
Author :
Boland, Simon D. ; Deriche, Mohamed
Author_Institution :
Sch. of Electr. & Electron. Syst. Eng., Queensland Univ. of Technol., Brisbane, Qld., Australia
Abstract :
This paper examines a new method for coding high quality digital audio signals based on a combination of linear predictive coding (LPC) and the discrete wavelet transform (DWT). In this method, a linear predictor is first used to model each audio frame. Then, the prediction error is analyzed using the DWT. The LPC coefficients and DWT coefficients are quantized using a novel bit allocation scheme which minimizes the overall quantization error with respect to the masking threshold. The proposed coder is capable of delivering near-transparent audio signal quality at encoding bit rates of around 90-96 kb/s. Objective and subjective results suggest that the proposed coder operating at 90-96 kb/s has a performance comparable to that of the MPEG layer II codec operating at 128 kb/s
Keywords :
audio coding; audio signals; codecs; digital signals; linear predictive coding; transform coding; wavelet transforms; 128 kbit/s; 90 to 96 kbit/s; DWT coefficients; LPC coefficients; LPC-DWT codec; MPEG layer II codec; audio frame; audio signal quality; bit allocation; bit rates; coefficients quantization; discrete wavelet transform; high quality audio coding; hybrid LPC-DWT algorithm; linear predictive coding; linear predictor; masking threshold; objective results; performance; prediction error; quantization error; subjective results; Audio coding; Bit rate; Codecs; Discrete wavelet transforms; Encoding; Error analysis; Linear predictive coding; Masking threshold; Predictive models; Quantization;
Conference_Titel :
TENCON '97. IEEE Region 10 Annual Conference. Speech and Image Technologies for Computing and Telecommunications., Proceedings of IEEE
Conference_Location :
Brisbane, Qld.
Print_ISBN :
0-7803-4365-4
DOI :
10.1109/TENCON.1997.648531
