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Discussion Groups | Speech Coding | Spectral Distortion in Lattice Filters
Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)
Spectral Distortion in Lattice Filters - #ARIJIT BISWAS# - Nov 22 5:05:00 2005
Dear Members of the list:
My question is related to quantization of Linear Prediction (LP) Parameters.
I know very well that LP parameters are mapped onto Reflection Coefficients and we get a lattice filter.
Now, lets say I have an order K Lattice filter: implying that I've a concatenation of first-order lattice filters.
If we quantize the parameters (i.e. the reflection coefficients) of each these first-order sections we get a Spectral Distortion associated with it, say D_k (k = 1,2,....,K). I would like to know if there is any straightforward relationship between these first-order Spectral Distortions to the overall Spectral Distortion in an order-K system.
For example, lets say, D_total = D_1 + D_2 +...... + D_K.
Is there any work done on this field? Is it possible to predict the overall distortion just from the knowledge of the distortion in the first-order section?
I'll be extremely grateful if someone can cite some references or maybe some indication on the overall distortion.
Best Regards,
~Arijit
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