S. Bharitkar
With the increase in popularity and capabilities of multi-channel systems (viz., Dolby Digital 5.1, DTS 5.1/7.1) for playback of audio and/or movie content, and the availability of powerful DSPs, it is particularly desirable to push the capability of these systems for providing immersive audio in consumer electronics. Digital equalization of loudspeaker-room acoustics is one such area that pushes the envelope of multi-channel systems by permitting the delivery of high quality audio by minimizing linear distortions due to loudspeaker and room acoustics. New development activities in room equalization algorithms, including novel filter order reduction techniques, using psychoacoustic principles and sub-band processing, have enabled dramatic reductions of acoustic distortion introduced by the loudspeaker and the room, thereby significantly improving the quality of speech and audio content. This tutorial will describe basic concepts and algorithms behind loudspeaker and room acoustic equalization. Specifically, the tutorial will include: (i) relevant concepts from room acoustics and psychoacoustics; (ii) the need for digital equalization for compensating magnitude and/or phase responses; (iii) recent algorithms for performing loudspeaker-room acoustic equalization.
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