hp100.c File Reference

#include "f2c.h"

Include dependency graph for hp100.c:

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Functions
int	hp100_ (real *speech, integer *start, integer *end, struct lpc10_encoder_state *st)
int	inithp100_ (void)

Function Documentation

hp100_()

int hp100_	(	real *	speech,
		integer *	start,
		integer *	end,
		struct lpc10_encoder_state *	st
	)

Definition at line 113 of file hp100.c.

References end, lpc10_encoder_state::z11, lpc10_encoder_state::z12, lpc10_encoder_state::z21, and lpc10_encoder_state::z22.

Referenced by prepro_().

{
    /* Temporary local copies of variables in lpc10_encoder_state.
       I've only created these because it might cause the loop below
       to execute a bit faster to access local variables, rather than
       variables in the lpc10_encoder_state structure.  It is just a
       guess that it will be faster. */

    real z11;
    real z21;
    real z12;
    real z22;

    /* System generated locals */
    integer i__1;

    /* Local variables */
    integer i__;
    real si, err;

/*       Arguments */
/*       Local variables that need not be saved */
/*       Local state */
    /* Parameter adjustments */
    if (speech) {
   --speech;
   }

    /* Function Body */

    z11 = st->z11;
    z21 = st->z21;
    z12 = st->z12;
    z22 = st->z22;

    i__1 = *end;
    for (i__ = *start; i__ <= i__1; ++i__) {
   si = speech[i__];
   err = si + z11 * 1.859076f - z21 * .8648249f;
   si = err - z11 * 2.f + z21;
   z21 = z11;
   z11 = err;
   err = si + z12 * 1.935715f - z22 * .9417004f;
   si = err - z12 * 2.f + z22;
   z22 = z12;
   z12 = err;
   speech[i__] = si * .902428f;
    }

    st->z11 = z11;
    st->z21 = z21;
    st->z12 = z12;
    st->z22 = z22;

    return 0;
} /* hp100_ */

inithp100_()

int inithp100_

(

void

)