Added filter for rateconversion 7200 -> 8000 samples/s.

lib/Makefile

@@ -1,7 +1,8 @@
 LDFLAGS=-lm
 CFLAGS=-O2 -g -Wall -pedantic -I../include
 
-LIBOBJS = bitreverse.o debug.o int2alaw.o module.o sincos.o isdn.o g711.o
+LIBOBJS = bitreverse.o debug.o int2alaw.o module.o sincos.o isdn.o g711.o \
+	  rate-7k2-8k-1.o
 
 all: isdnlib.a
 

lib/rate-7k2-8k-1.c

@@ -0,0 +1,53 @@
+/* $Id$
+******************************************************************************
+
+   Fax program for ISDN.
+   A filter for use when rateconverting from 7200 Hz to 8000 Hz after
+   the modulator.  The upsample factor is 10, downsample is 9.
+   This particular filter bandpasses the signal to 500-2900 Hz,
+   with -4.5dB at the limits.  Attenuation is -60dB at 3600Hz.
+   Filter is 247 coefs long, linear phase, with 3 added zeros to
+   get 250 coefs total (divisible by upsample factor of 10).
+
+   Copyright (C) 1998 Morten Rolland [Morten.Rolland@asker.mail.telia.com]
+  
+   Permission is hereby granted, free of charge, to any person obtaining a
+   copy of this software and associated documentation files (the "Software"),
+   to deal in the Software without restriction, including without limitation
+   the rights to use, copy, modify, merge, publish, distribute, sublicense,
+   and/or sell copies of the Software, and to permit persons to whom the
+   Software is furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+   THE AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+   IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+******************************************************************************
+*/
+
+
+signed short rate_7k2_8k_1[250] = {
+  0,-2,-4,-6,-9,-12,-14,-16,-16,-15,-12,-7,0,10,22,35,49,63,75,86,93,96,
+  94,85,70,49,22,-9,-43,-78,-111,-140,-161,-174,-175,-164,-140,-103,-56,
+  -1,58,118,172,215,243,251,234,191,121,24,-96,-234,-384,-538,-687,-821,
+  -932,-1011,-1052,-1051,-1007,-920,-798,-647,-480,-309,-150,-19,69,101,
+  65,-45,-232,-494,-822,-1203,-1620,-2049,-2468,-2849,-3168,-3403,-3533,
+  -3547,-3439,-3211,-2874,-2447,-1958,-1441,-934,-480,-119,109,171,43,-291,
+  -833,-1570,-2477,-3513,-4628,-5757,-6830,-7774,-8512,-8975,-9100,-8835,
+  -8147,-7019,-5454,-3478,-1138,1500,4353,7324,10304,13183,15848,18195,
+  20128,21569,22459,22759,22459,21569,20128,18195,15848,13183,10304,7324,
+  4353,1500,-1138,-3478,-5454,-7019,-8147,-8835,-9100,-8975,-8512,-7774,
+  -6830,-5757,-4628,-3513,-2477,-1570,-833,-291,43,171,109,-119,-480,-934,
+  -1441,-1958,-2447,-2874,-3211,-3439,-3547,-3533,-3403,-3168,-2849,-2468,
+  -2049,-1620,-1203,-822,-494,-232,-45,65,101,69,-19,-150,-309,-480,-647,
+  -798,-920,-1007,-1051,-1052,-1011,-932,-821,-687,-538,-384,-234,-96,24,
+  121,191,234,251,243,215,172,118,58,-1,-56,-103,-140,-164,-175,-174,-161,
+  -140,-111,-78,-43,-9,22,49,70,85,94,96,93,86,75,63,49,35,22,10,0,-7,-12,
+  -15,-16,-16,-14,-12,-9,-6,-4,-2,0,0
+};