Presented are modifications to the MPEG-2 AAC encoder that significantly increase computational efficiency while maintaining high sound quality. These modifications include changes to the perceptual model, block-switching control, pre-estimation of quantizer scale-factors, and changes to the quantizer rate/distortion loop. These changes result in an overall speedup (when combined with processor-specific optimizations) of approximately 250% compared to the reference Low Complexity professional MPEG-2 AAC encoder. Tests show a mean degradation of 0.2 on the ITU-R 5-point audio impairment scale.
Authors:
Smithers, Michael J.; Fellers, Matt C.
Affiliation:
Dolby Laboratories, San Francisco, CA
AES Convention:
111 (November 2001)
Paper Number:
5490
Publication Date:
November 1, 2001
Subject:
Coding of Audio Signals
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.