A Low‐Delay MDCT/IMDCT. Issue 5 (1st October 2013)

• Record Type: Journal Article
• Authors: Lee, Sangkil; Lee, Insung
• Is Part Of: ETRI journal. Volume 35:Issue 5(2013)
• Page Start: 935
• Page End: 938
• Publication Date: 2013-10-01
• Subjects: MDCT -- IMDCT -- low delay -- aliasing cancellation; Telecommunication -- Periodicals; Electronics -- Periodicals; Electronics; Telecommunication; Periodicals; Periodicals; 621.38205
• DOI: 10.4218/etrij.13.0212.0559
• Languages: English
• ISSNs: 1225-6463

Abstract

Abstract : This letter presents an algorithm for selecting a low delay for the modified discrete cosine transform (MDCT) and inverse MDCT (IMDCT). The implementation of conventional MDCT and IMDCT requires a 50% overlap‐add (OLA) for a perfect reconstruction. In the OLA process, an algorithmic delay in the frame length is employed. A reduced overlap window and MDCT/IMDCT phase shifting is used to reduce the algorithmic delay. The performance of the proposed algorithm is evaluated by applying the low‐delay MDCT to the G. 729.1 speech codec.