View source for Log area ratio

'''Log area ratios''' ('''LAR''') can be used to represent [[reflection coefficient]]s (another form for [[Linear predictive coding|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>r_k</math> be the ''k''th reflection coefficient of a filter, the ''k''th LAR is:

: <math>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==
* [[Line spectral pairs]]

{{Compression Methods}}

[[Category:Lossy compression algorithms]]


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