AES E-Library

AES E-Library

Frequency Scale Translation in the MDCT Domain for AAC Decoder Algorithm

In mobile audio device applications, there is sometimes the need to include processing that can change the pitch or tempo of the sound. This additional signal processing can produce a power load on the batteries, which could be minimized if the decoder stage was combined with the pitch-time shift operation. The authors propose a modified AAC (advanced audio coding) decoder structure that can also change the pitch and tempo of an audio signal. To take advantage of the combination, the algorithm includes a preprocessing block before the IMDCT (inverse modified discrete cosine transform) block and a postprocessing block after the overlap and add block. Test results show that the algorithm produces quality results while reducing the computational load to 64% of the separate algorithms.

JAES Volume 62 Issue 3 pp. 118-126; March 2014
Publication Date:

Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $33 for non-members and is free for AES members and E-Library subscribers.

Learn more about the AES E-Library

E-Library Location:


Start a discussion about this paper!

AES - Audio Engineering Society