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.
Click to purchase paper as a non-member or you can login as an AES member to see more options.
No AES members have commented on this paper yet.
To be notified of new comments on this paper you can
subscribe to this RSS feed.
Forum users should login to see additional options.
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.
