[hts-users:01641] Vocoder with MGC-LSP: why call HTS_mc2b()?
- Subject: [hts-users:01641] Vocoder with MGC-LSP: why call HTS_mc2b()?
- From: "Nicholas Volk" <nvolk@xxxxxxxxxx>
- Date: Tue, 12 Aug 2008 09:20:15 +0300 (EEST)
- Delivered-to: hts-users@xxxxxxxxxxxxxxx
- Importance: Normal
Hi,
Is there some reason why LSP mode calls HTS_mc2b()? At least by default,
as alpha is 0.0 and mc == b for LSP, the function doesn't do anything.
Below is a somewhat faster version. (Admittedly this isn't a major CPU
bottlenect.) Or is there some reason to have a case where alpha!=0 for
LSP?
br,
Nicholas
/* HTS_mc2b: transform mel-cepstrum to MLSA digital fillter coefficients */
static void HTS_mc2b(double *mc, double *b, int m, const double a) {
if ( mc != b ) {
b[m] = mc[m];
for (m--; m >= 0; m--)
b[m] = mc[m] - a * b[m + 1];
}
else {
if ( a != 0.0 ) {
for (m--; m >= 0; m--) b[m] -= a*b[m+1];
}
}
}
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