Log area ratio
Log area ratios can be used to represent reflection coefficients for transmission over a channel. While not as efficient as line spectral pairs, log area ratios are much simpler to compute. Let be the kth reflection coefficient of a filter, the kth LAR is:
Use of Log Area Ratios have now been mostly replaced by Line Spectral Pairs, but older codecs, such as GSM-FR use LARs.
