A Time-Frequency Hybrid Downmixing Method for AC-3 Decoding

作者：Li, Hui^*; Wang, Yiwen; Li, Ping

来源：IEEE Signal Processing Letters, 2014, 21(8): 933-936.

DOI：10.1109/LSP.2014.2321061

• AC-3
• decoding
• downmixing
• inverse modified discrete cosine transform (IMDCT)
• type-IV discrete cosine transform (DCT-IV)

In this letter, a time-frequency hybrid downmixing method is proposed for AC-3 decoding. The proposed method consists of downmixing frequency coefficients of long blocks and short blocks respectively, computing long and short inverse modified discrete cosine transforms (IMDCTs), and adding operation. Compared with one reported fast frequency-domain downmixing method, the proposed method does not need frequency coefficients conversion between long and short blocks, and has approximately 26% and 32% reduction in numbers of additions and multiplications, respectively.

• 出版日期2014-8
• 单位电子薄膜与集成器件国家重点实验室; 电子科技大学