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Efficient Audio Equalization Using Multirate Processing

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The excessive computational burden of some specialized equalization requirements can be reduced by using multirate processing. Quadrature mirror filters split the audio signal into narrow bands that can be downsampled and then filtered with modest processing loads. The composite bands are then upsampled and reconstructed into a full-band signal. The main advantage of this approach is design flexibility since the filters in each band can be implemented independently of each other.

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JAES Volume 56 Issue 4 pp. 255-266; April 2008
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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=14384

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AES - Audio Engineering Society