Fast time-frequency transform algorithms and their applications to real-time software implementation of AC-3 audio codec

@article{Chen1998FastTT,
  title={Fast time-frequency transform algorithms and their applications to real-time software implementation of AC-3 audio codec},
  author={Yu-Chi Chen and Chien-Wu Tsai and Ja-Ling Wu},
  journal={IEEE Transactions on Consumer Electronics},
  year={1998},
  volume={44},
  pages={413-423}
}
AC-3 audio coding technology is a kind of perceptual audio coder (PAC) developed by the Dolby Company. Up to 5 full-bandwidth channels and one subwoofer channel (cutoff at 120 Hz) are available in AC-3 to provide multi-channel, low bit rate, and high perceptual quality of audio. This explains why AC-3 has become the audio standard of many international standards. In this paper, we focus on the real-time software implementation issues of AC-3. Two fast algorithms of the time-frequency transform… Expand
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References

SHOWING 1-8 OF 8 REFERENCES
A fast algorithm for the implementation of filter banks based on 'time domain aliasing cancellation'
  • P. Duhamel, Y. Mahieux, J. Petit
  • Computer Science
  • [Proceedings] ICASSP 91: 1991 International Conference on Acoustics, Speech, and Signal Processing
  • 1991
TLDR
The authors concentrate on the subband/transform coding scheme using filter banks known as time domain aliasing cancellation (TDAC), which involves a window on a set of N data, overlapping by N/2 with the previous one, followed by a TDAC transform. Expand
A differential perceptual audio coding method with reduced bitrate requirements
TLDR
An error analysis for the proposed audio transform coding technique is presented, indicating that an average of 30% in compression gain can be achieved, with a small deterioration in the audio quality of the coded signal. Expand
Regular implementation algorithms of time domain aliasing cancellation
The authors propose two highly regular algorithms for realising the time domain aliasing cancellation (TDAC) technique. The first TDAC implementation, which is based on the fast discrete cosineExpand
Principles of Digital Audio
From the Publisher: Widely acknowledged as the "bible" of digital audio for both professional designers and engineering students, Principles of Digital Audio has been updated and expanded toExpand
Analysis/Synthesis filter bank design based on time domain aliasing cancellation
TLDR
A single-sideband analysis/synthesis system is proposed which provides perfect reconstruction of a signal from a set of critically sampled analysis signals and allows overlap between adjacent time windows, implying that time domain aliasing is introduced in the analysis; however, thisAliasing is cancelled in the synthesis process, and the system can provide perfect reconstruction. Expand
Signal processing with lapped transforms
Applications of transforms in signal processing signal processing in subbands lapped orthogonal transforms the modulated lapped transform heirarchical lapped transforms applications of lappedExpand
On computing the discrete Fourier and cosine transforms
  • Z. Wang
  • Mathematics, Computer Science
  • IEEE Trans. Acoust. Speech Signal Process.
  • 1985
An efficient algorithm based on real matrix decomposition is developed for computing a class of sinusoidal transforms, that include the discrete Fourier and cosine transform.