Title :
Improved lossless audio coding using the noise-shaped IntMDCT
Author :
Yokotani, Yoshikazu ; Geiger, Ralf ; Schuller, Gerald ; Oraintara, Soontorn ; Rao, K.R.
Author_Institution :
Dept. of Electr. Eng., Texas Univ., Arlington, TX, USA
Abstract :
This paper discusses approximation noise shaping to improve the efficiency of the integer modified discrete cosine transform (IntMDCT)-based lossless audio codec. The scheme is applied to rounding operations associated with lifting steps to shape the noise spectrum towards the low frequency bands. In this paper, constraints on the noise shaping filter and a design procedure with the constraints are discussed. Several noise shaping filters are designed and experimental results showing the improvement are presented.
Keywords :
audio coding; discrete cosine transforms; low-pass filters; approximation noise shaping; integer modified discrete cosine transform; lifting step rounding operations; lossless audio codec efficiency; lossless audio coding; low pass filter; noise shaping filter constraints; noise spectrum shaping; noise-shaped IntMDCT; Audio coding; Discrete cosine transforms; Filters; Floors; Frequency; Low-frequency noise; Noise cancellation; Noise level; Noise shaping; Roundoff errors;
Conference_Titel :
Digital Signal Processing Workshop, 2004 and the 3rd IEEE Signal Processing Education Workshop. 2004 IEEE 11th
Print_ISBN :
0-7803-8434-2
DOI :
10.1109/DSPWS.2004.1437975
