AES E-Library

AES E-Library

Implementing MPEG Advanced Audio Coding and Layer-3 Encoders on 32-bit and 16-bit Fixed-point Processors

Document Thumbnail

Encoder implementations of MPEG Advanced Audio Coding and Layer-3 (mp3) on 32-bit or 16-bit fixed-point processors are challenging due to the fact that the usable word length is restricted to 32 bits if low processing power is required. This paper describes the modifications and optimizations that had to be applied to the algorithms of these audio encoders to make a true fixed-point implementation on a 32-bit or 16-bit device possible. The implementation had to be done without using floating-point emulations or even 64-bit values for the signal energies and thresholds in the psychoacoustic model of the encoder. At the same time high encoding quality and speed were required. Memory and processing power requirements on various platforms as well as results from a subjective listening test will be presented.

AES Convention: Paper Number:
Publication Date:
Session Subject:

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