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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 ${\displaystyle r_{k}}$ be the: kth reflection coefficient of a filter, the——kth LAR is:

${\displaystyle A_{k}=\log {1-r_{k} \over 1+r_{k}}}$

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

References※

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