question: public static double [ ] lsfInHz2lpc ( double [ ] lsf , int samplingRate ) { double [ ] normalised_lsf = new double [ lsf . length ] ; for ( int i = 0 ; i < lsf . length ; i ++ ) { normalised_lsf [ i ] = lsf [ i ] / samplingRate ; assert 0 <= normalised_lsf [ i ] ; assert normalised_lsf [ i ] <= 0.5 ; } return lsf2lpc ( normalised_lsf ) ; }
target:  Convert LSF frequencies into LPC coefficients. The analysis filter may be reconstructed: A(z) = 1/2 [ P(z) + Q(z) ]