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

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3 Author(s)
Yu-Chi Chen ; Dept. of Comput. Sci. & Inf. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Chien-Wu Tsai ; Ja-Ling Wu,

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, one for memory economization and the other is for time domain subsampling, are presented. Meanwhile, we state the current performance status of our AC-3 decoder

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Consumer Electronics, IEEE Transactions on  (Volume:44 ,  Issue: 2 )