Version 0.1.2 from FTP

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@169 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 113 insertions, 0 deletions

diff --git a/codecs/lpc10/lpfilt.c b/codecs/lpc10/lpfilt.c
new file mode 100755
index 000000000..78551f457
--- /dev/null
+++ b/codecs/lpc10/lpfilt.c
@@ -0,0 +1,113 @@
+/*
+
+$Log$
+Revision 1.1  2000/01/05 08:20:39  markster
+Version 0.1.2 from FTP
+
+Revision 1.2  2000/01/05 08:20:39  markster
+Some OSS fixes and a few lpc changes to make it actually work
+
+ * Revision 1.1  1996/08/19  22:31:35  jaf
+ * Initial revision
+ *
+
+*/
+
+#ifdef P_R_O_T_O_T_Y_P_E_S
+extern int lpfilt_(real *inbuf, real *lpbuf, integer *len, integer *nsamp);
+#endif
+
+/*  -- translated by f2c (version 19951025).
+   You must link the resulting object file with the libraries:
+	-lf2c -lm   (in that order)
+*/
+
+#include "f2c.h"
+
+/* *********************************************************************** */
+
+/* 	LPFILT Version 55 */
+
+/* $Log$
+ * Revision 1.1  2000/01/05 08:20:39  markster
+ * Version 0.1.2 from FTP
+ *
+/* Revision 1.2  2000/01/05 08:20:39  markster
+/* Some OSS fixes and a few lpc changes to make it actually work
+/*
+ * Revision 1.1  1996/08/19  22:31:35  jaf
+ * Initial revision
+ * */
+/* Revision 1.3  1996/03/15  16:53:49  jaf */
+/* Just put comment header in standard form. */
+
+/* Revision 1.2  1996/03/12  23:58:06  jaf */
+/* Comments added explaining that none of the local variables of this */
+/* subroutine need to be saved from one invocation to the next. */
+
+/* Revision 1.1  1996/02/07 14:47:44  jaf */
+/* Initial revision */
+
+
+/* *********************************************************************** */
+
+/*   31 Point Equiripple FIR Low-Pass Filter */
+/*     Linear phase, delay = 15 samples */
+
+/* 	Passband:  ripple = 0.25 dB, cutoff =  800 Hz */
+/* 	Stopband:  atten. =  40. dB, cutoff = 1240 Hz */
+
+/* Inputs: */
+/*  LEN    - Length of speech buffers */
+/*  NSAMP  - Number of samples to filter */
+/*  INBUF  - Input speech buffer */
+/*           Indices len-nsamp-29 through len are read. */
+/* Output: */
+/*  LPBUF  - Low passed speech buffer (must be different array than INBUF) */
+/*           Indices len+1-nsamp through len are written. */
+
+/* This subroutine has no local state. */
+
+/* Subroutine */ int lpfilt_(real *inbuf, real *lpbuf, integer *len, integer *
+	nsamp)
+{
+    /* System generated locals */
+    integer i__1;
+
+    /* Local variables */
+    integer j;
+    real t;
+
+/* 	Arguments */
+/* 	Parameters/constants */
+/*       Local variables that need not be saved */
+/*       Local state */
+/*       None */
+    /* Parameter adjustments */
+    --lpbuf;
+    --inbuf;
+
+    /* Function Body */
+    i__1 = *len;
+    for (j = *len + 1 - *nsamp; j <= i__1; ++j) {
+	t = (inbuf[j] + inbuf[j - 30]) * -.0097201988f;
+	t += (inbuf[j - 1] + inbuf[j - 29]) * -.0105179986f;
+	t += (inbuf[j - 2] + inbuf[j - 28]) * -.0083479648f;
+	t += (inbuf[j - 3] + inbuf[j - 27]) * 5.860774e-4f;
+	t += (inbuf[j - 4] + inbuf[j - 26]) * .0130892089f;
+	t += (inbuf[j - 5] + inbuf[j - 25]) * .0217052232f;
+	t += (inbuf[j - 6] + inbuf[j - 24]) * .0184161253f;
+	t += (inbuf[j - 7] + inbuf[j - 23]) * 3.39723e-4f;
+	t += (inbuf[j - 8] + inbuf[j - 22]) * -.0260797087f;
+	t += (inbuf[j - 9] + inbuf[j - 21]) * -.0455563702f;
+	t += (inbuf[j - 10] + inbuf[j - 20]) * -.040306855f;
+	t += (inbuf[j - 11] + inbuf[j - 19]) * 5.029835e-4f;
+	t += (inbuf[j - 12] + inbuf[j - 18]) * .0729262903f;
+	t += (inbuf[j - 13] + inbuf[j - 17]) * .1572008878f;
+	t += (inbuf[j - 14] + inbuf[j - 16]) * .2247288674f;
+	t += inbuf[j - 15] * .250535965f;
+	lpbuf[j] = t;
+    }
+    return 0;
+} /* lpfilt_ */
+