Hi Everyone,
I'm working on a speech vocoder and have so far been able to use a combination
of SPTK and codec2 functions to achieve most of this. However I'm confused as I
want to be able to control the order of the lpc coefficients in real-time as a
parameter but my LSP_to_LPC seems to have an upper limit to the order it can
convert from LSPs to LPCs (I'm converting to LSPs to do some interpolation and
then converting back). I have found the highest order to be 25 but can push the
LPC order to 512 for example if I bypass the LPC to LSP/LSP to LPC conversion
stage and just filter with the initially derived LPC coefficients.
It looks like the LPC to LSP function is working fine and the problem is in the
conversion back to LPC...
Does anyone know why there would be a limit to the order in this conversion. Is
there an element in the theory of LSPs that explains this? I'm thinking it is
to do with precision error but I'm not sure?
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