Incorporating perception into LSF quantization some experiments
R.P. Cohn, John S. Collura · 2002
In the context of vector quantization (VQ) of the line spectrum frequency (LSF) parameters, we determine experimentally a spectral distribution of quantization error perceived to be "balanced", i.e., error at all frequencies contributing equally, on average, to the perceived distortion. Quantizers which have a balanced distribution should outperform those which don't, given the same number of bits. We examine the spectral error distributions produced by various weighted Euclidean distance measures in the LSF domain and develop one which produces a quantizer having an approximately balanced distribution. This quantizer's performance is compared with that of others having different error distributions.