Currently the only reliable method for evaluating the audio quality of low bit-rate audio codecs is by subjective assessments. This is a costly and very time-consuming procedure. Furthermore, existing coding standards are very flexible and allow for large differences in implementation without violating these standards. Thus, evaluations of individual implementations are necessary, but cost and efforts may hamper this. It is desirable that subjective assessments can be replaced, or at least complemented, by an objective measurement method. A number of proposals for objective perceptual models have been described in literature. At present, these methods are not sufficiently validated. In 1994, ITU-R established Task Group 10-4 to recommend a method for objective perceptual measurements of audio equipment. A draft recommendation is expected by the end of 1996. This paper reports on the work in ITU-R Task Group 10-4 and the requirements as outlined by the group. Experiences gained by the Swedish Broadcasting Corporation when using one of the proposed models, PAQM from PTT Netherlands, are also discussed.
Author:
Grewin, Christer
Affiliation:
Swedish Broadcasting Corporation, Stockholm, Sweden
AES Convention:
99 (October 1995)
Paper Number:
4067
Publication Date:
October 1, 1995
Subject:
Low Bit-Rate Audio: Technologies and Subjective Evaluation
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.