Log area ratio
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Revision as of 09:18, 24 December 2020 by imported>Scavis (linkage)
Log area ratios (LAR) can be used to represent reflection coefficients (another form for linear prediction coefficients) for transmission over a channel. While not as efficient as line spectral pairs (LSPs), log area ratios are much simpler to compute. Let [math]\displaystyle{ r_k }[/math] be the kth reflection coefficient of a filter, the kth LAR is:
- [math]\displaystyle{ A_k = \log{1-r_k \over 1+r_k} }[/math]
Use of Log Area Ratios have now been mostly replaced by Line Spectral Pairs, but older codecs, such as GSM-FR use LARs.
See also
![]() | Original source: https://en.wikipedia.org/wiki/Log area ratio.
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