This paper introduces a new signal processing system which enhances reverberance imagery (i.e. perceived ambiance or listener envelopment) in loudspeaker audio scenes. Sound components which affect reverberance imagery are extracted from a pair of unencoded audio signals and are radiated with two additional loudspeakers behind the listener. The new “ambiance extraction” system improves upon all extant systems by using a novel automatic (blind) equalizer based on the normalized least means square (NLMS) algorithm to align the input signals with respect to both level and time in order to create the difference signal. The alignment is typically undertaken using a 1024-tap frequency and ±10 ms time equalizer, which allows sound components with a high short-term correlation to be removed from the input audio signals. Subjective and objective evaluation was undertaken with recordings of solo musical performances in a concert hall, and show that the new system provides a computationally practical, high-quality solution to the problem of ambiance extraction for audio upmixing.
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.
