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

Author

Hui Li ; Yiwen Wang ; Ping Li

Author_Institution

State Key Lab. of Electron. Thin Films & Integrated Devices, Univ. of Electron. Sci. & Technol. of China, Chengdu, China

Volume

21

Issue

8

fYear

2014

fDate

Aug. 2014

Firstpage

933

Lastpage

936

Abstract

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.

Keywords

audio coding; decoding; discrete cosine transforms; inverse transforms; time-frequency analysis; AC-3 decoding; IMDCT; adding operation; audio encoding; audio standards; downmixing frequency coefficients; fast frequency-domain downmixing; frequency coefficients conversion; inverse modified discrete cosine transforms; time-frequency hybrid downmixing method; Decoding; Equations; Frequency conversion; Time-domain analysis; Time-frequency analysis; Transforms; AC-3; decoding; downmixing; inverse modified discrete cosine transform (IMDCT); type-IV discrete cosine transform (DCT-IV);

fLanguage

English

Journal_Title

Signal Processing Letters, IEEE

Publisher

ieee

ISSN

1070-9908

Type

jour

DOI

10.1109/LSP.2014.2321061

Filename

6807667