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Bandwidth expansion
Technique for widening the bandwidth or the resonances in an LPC filter From Wikipedia, the free encyclopedia
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Bandwidth expansion is a technique for widening the bandwidth or the resonances in an LPC filter. This is done by moving all the poles towards the origin by a constant factor . The bandwidth-expanded filter can be easily derived from the original filter by:
This article relies largely or entirely on a single source. (July 2025) |
Let be expressed as:
The bandwidth-expanded filter can be expressed as:
In other words, each coefficient in the original filter is simply multiplied by in the bandwidth-expanded filter. The simplicity of this transformation makes it attractive, especially in CELP coding of speech, where it is often used for the perceptual noise weighting and/or to stabilize the LPC analysis. However, when it comes to stabilizing the LPC analysis, lag windowing is often preferred to bandwidth expansion.
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