Log Area Ratios

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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 rk be the kth reflection coefficient of a filter, the kth LAR is:

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

Data compression methods
Lossless compression methods
RLE · LZ77/78 · LZSS · LZW · LZWL · LZO · DEFLATE · LZMA · LZX · LZJB
Others
CTW · BWT · PPM · DMC
Audio compression methods
LPC (LAR · LSP) · WLPC · CELP · ACELP · A-law · μ-law · MDCT · Fourier transform · Psychoacoustic model
Others
Image compression methods
Terms
Methods
RLE · Fractal · Wavelet · SPIHT · DCT · KLT
Others
Video compression
Terms
Others
See Compression Formats and Standards for formats and Compression Software Implementations for codecs
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Retrieved from "http://en.wikipedia.org/wiki/Log_Area_Ratios"

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