Recursive architecture using pipeline stall for low complexity MPEG-4 ALS encoder

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Recursive architecture using pipeline stall for low complexity MPEG-4 ALS encoder

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An MPEG-4 audio lossless coding (ALS) encoder consists of a short-term predictor, a joint coder, a long-term predictor, and an entropy coder for audio signal compression. Especially, the short-term predictor is the highest complexity in MPEG-4 ALS encoder implementation because linear prediction coefficients (LPCs) for the short-term predictor are obtained from the Levinson-Durbin recursion algorithm that uses correlations of the input signals. LPCs are used for the finite impulse response (FIR) filter of the short-term predictor and its maximum coefficient order is up to 1023. Proposed is an area-efficient short-term predictor through the recursive architecture using pipeline stall and the modified radix-2 FIR algorithm is proposed. The proposed shot-term predictor has a reduction of complexity by about 95% compared to the radix-2 1024 tap FIR filter.

Inspec keywords: entropy codes; FIR filters; data compression; audio coding

Other keywords: low complexity MPEG-4 ALS encoder; recursive architecture; entropy coder; FIR filter; linear prediction coefficients; MPEG-4 audio lossless coding; modified radix-2 FIR algorithm; finite impulse response filter; joint coder; Levinson-Durbin recursion algorithm; pipeline stall; area-efficient short-term predictor; audio signal compression; long-term predictor

Subjects: Speech and audio coding; Filtering methods in signal processing

References

    1. 1)
      • Liebchen, T., Reznik, Y.A.: `Improved forward adaptive prediction for MPEG-4 audio lossless coding', Proc. of 118th AES Convention, May 2005, Barcelona, Spain, Preprint No. 6449.
    2. 2)
      • T.-B. Deng . Hybrid structures for low-complexity variable fractional-delay FIR filters. IEEE Trans. Circuits Syst. , 4
    3. 3)
      • Liebchen, T., Moriya, T., Harada, N., Kamanoto, Y., Reznik, Y.: `The MPEG-4 audio lossless coding (ALS) standard-technology and applications', Proc. of 119th AES Convention, October 2005, New York, USA, Preprint No. 6589.
    4. 4)
      • ISO/IEC 14496-3:2005/Amd2 : 2006, Information technology – Coding of audio-visual objects, Part 3: Audio Lossless Coding (ALS), new audio profiles and BSAC extensions, March 2006.
    5. 5)
      • Cho, C.S., Choi, B.H., Kang, J.A., Kim, H.K., Kim, J.W., Lee, S.P.: `An efficient forward prediction order selection method for MPEG-4 audio lossless coding', Proc. 34th AES Int. Conf., August 2008, Jeju Island, Republic of Korea.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2010.3751
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