remove unused function

 * Estimation of pitch-synchronous (voiced sounds) or half-frame energy

 *----------------------------------------------------------------------------------*/

void fer_energy(

    const int16_t L_frame, /* i  : frame length                           */

    const int16_t clas,    /* i  : frame classification                   */

    const float *synth,    /* i  : synthesized speech at Fs = 12k8 Hz     */

    const float pitch,     /* i  : pitch period                           */

    float *enr,            /* o  : pitch-synchronous or half_frame energy */

    const int16_t offset   /* i  : speech pointer offset (0 or L_frame)   */

)

{

    int16_t len;

    const float *pt_synth;

    if ( clas == VOICED_CLAS || clas == ONSET || clas == SIN_ONSET ) /* Voiced or Onset current frame */

    {

        len = (int16_t) ( pitch + 0.5f ); /* pitch value */

        pt_synth = synth;

        if ( offset != 0 )

        {

            pt_synth = synth + L_frame - len;

        }

        emaximum( pt_synth, len, enr ); /* pitch synchronous E */

    }

    else

    {

        pt_synth = synth;

        if ( offset != 0 )

        {

            pt_synth = synth + L_frame / 2;

        }

        *enr = dotp( pt_synth, pt_synth, L_frame / 2 );

        *enr /= (float) ( L_frame / 2 );

    }

    return;

}

void fer_energy_fx(

    const Word16 L_frame, /* i  : frame length                                      */

    const Word16 clas,    /* i  : frame classification                              */