Most techniques for estimating the transfer function (or impulse response) of an acoustical space with a high signal-to-noise ratio operate along similar principles. A known, broadband signal is transmitted at one point in the room whilst being simultaneously recorded at another. A matched-filter is then used to compress the transmission waveform into an approximate impulse and equalisation filtering is used to remove any colouration caused by the non-uniform energy-spectrum of the transmission and/or the non-ideal response of the loudspeaker/microphone combination. In this paper, the limitations of this conventional technique will be highlighted, especially when using low-cost equipment. An alternative, non-linear deconvolution technique is proposed which will be shown to give superior performance using both synthetic waveforms and practical room measurements.
Author:
Collins, Tim
Affiliation:
University of Birmingham, Edgbaston, Birmingham, UK
AES Convention:
116 (May 2004)
Paper Number:
6170
Publication Date:
May 1, 2004
Session Subject:
Room and Architectural Acoustics; Sound Reinforcement
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.