impulse.c
上传用户:szhypcb168
上传日期:2007-01-06
资源大小:2187k
文件大小:1k
- /**************************************************************************
- *
- * ROUTINE
- * impulse
- *
- * FUNCTION
- * compute impulse response with direct form filter
- * exclusive of adaptive code book contribution
- *
- * SYNOPSIS
- * subroutine impulse(l)
- *
- * formal
- *
- * data I/O
- * name type type function
- * -------------------------------------------------------------------
- * l int i impulse response length
- *
- * external
- * data I/O
- * name type type function
- * -------------------------------------------------------------------
- * no int i
- * fc[] float i
- * h[] float i/o
- * gamma2 float i
- *
- ***************************************************************************
- *
- * Global Variables
- *
- *
- * SPECTRUM VARIABLE:
- * d5 real auxiliary array
- *
- ****************************************************************************
- * CALLED BY
- *
- * csub
- *
- * CALLS
- *
- * bwexp setr polefilt
- *
- **************************************************************************/
- #include "ccsub.h"
- extern int no;
- extern float fc[MAXNO+1], h[MAXLP], gamma2;
- impulse(l)
- int l;
- {
- float d5[MAXNO+1], fctemp[MAXNO + 1];
- setr(l, 0.0, h);
- h[0] = 1.0;
- setr(no + 1, 0.0, d5);
- bwexp(gamma2, fc, fctemp, no);
- polefilt(fctemp, no, d5, h, l);
- }