diff --git a/src/switch_core_asr.c b/src/switch_core_asr.c
index b49dfb63c3..6f63302042 100644
--- a/src/switch_core_asr.c
+++ b/src/switch_core_asr.c
@@ -251,7 +251,7 @@ SWITCH_DECLARE(switch_status_t) switch_core_asr_feed(switch_asr_handle_t *ah, vo
 		}
 
 		switch_resample_process(ah->resampler, data, len / 2);
-		if (ah->resampler->to_len > orig_len) {
+		if (ah->resampler->to_len * 2 > orig_len) {
 			if (!ah->dbuf) {
 				void *mem;
 				ah->dbuflen = ah->resampler->to_len * 2;
@@ -266,7 +266,7 @@ SWITCH_DECLARE(switch_status_t) switch_core_asr_feed(switch_asr_handle_t *ah, vo
 			memcpy(data, ah->resampler->to, ah->resampler->to_len * 2);
 		}
 
-		len = ah->resampler->to_len;
+		len = ah->resampler->to_len * 2;
 	}
 
 	return ah->asr_interface->asr_feed(ah, data, len, flags);
diff --git a/tests/unit/Makefile.am b/tests/unit/Makefile.am
index c795fd7d9f..214ec467b1 100644
--- a/tests/unit/Makefile.am
+++ b/tests/unit/Makefile.am
@@ -2,7 +2,7 @@ include $(top_srcdir)/build/modmake.rulesam
 
 noinst_PROGRAMS = switch_event switch_hash switch_ivr_originate switch_utils switch_core switch_console switch_vpx switch_core_file \
 			   switch_ivr_play_say switch_core_codec switch_rtp switch_xml
-noinst_PROGRAMS+= switch_core_video switch_core_db switch_vad
+noinst_PROGRAMS+= switch_core_video switch_core_db switch_vad switch_core_asr
 AM_LDFLAGS  = -avoid-version -no-undefined $(SWITCH_AM_LDFLAGS) $(openssl_LIBS)
 AM_LDFLAGS += $(FREESWITCH_LIBS) $(switch_builddir)/libfreeswitch.la $(CORE_LIBS) $(APR_LIBS)
 AM_CFLAGS   = $(SWITCH_AM_CPPFLAGS)
diff --git a/tests/unit/conf/freeswitch.xml b/tests/unit/conf/freeswitch.xml
index 90600975e4..578a4fe2b7 100644
--- a/tests/unit/conf/freeswitch.xml
+++ b/tests/unit/conf/freeswitch.xml
@@ -16,6 +16,7 @@
 		<load module="mod_sndfile"/>
 		<load module="mod_dialplan_xml"/>
 		<load module="mod_sndfile"/>
+		<load module="mod_test"/>
       </modules>
     </configuration>
 
diff --git a/tests/unit/switch_core_asr.c b/tests/unit/switch_core_asr.c
new file mode 100644
index 0000000000..4b585e07d0
--- /dev/null
+++ b/tests/unit/switch_core_asr.c
@@ -0,0 +1,83 @@
+/*
+ * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+ * Copyright (C) 2005-2018, Anthony Minessale II <anthm@freeswitch.org>
+ *
+ * Version: MPL 1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+ *
+ * The Initial Developer of the Original Code is
+ * Anthony Minessale II <anthm@freeswitch.org>
+ * Portions created by the Initial Developer are Copyright (C)
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ * Willie Zhang <zhanghong905011@163.com>
+ *
+ * switch_core_asr.c -- tests file core functions
+ *
+ */
+#include <switch.h>
+#include <stdlib.h>
+
+#include <test/switch_test.h>
+
+FST_CORE_BEGIN("./conf")
+{
+	FST_SUITE_BEGIN(switch_core_asr)
+	{
+		FST_SETUP_BEGIN()
+		{
+			fst_requires_module("mod_test");
+			fst_requires_module("mod_tone_stream");
+		}
+		FST_SETUP_END()
+
+		FST_TEARDOWN_BEGIN()
+		{
+		}
+		FST_TEARDOWN_END()
+
+		FST_TEST_BEGIN(core_asr_feed_resample)
+		{
+			uint8_t *buf;
+			size_t len = 960;
+			char input_filename[1024];
+			const char* session_id = "123456";
+			switch_asr_handle_t ah = { 0 };
+			switch_file_handle_t file_handle = { 0 };
+			switch_asr_flag_t flags = SWITCH_ASR_FLAG_NONE;
+			char *grammar = switch_core_sprintf(fst_pool, "{start-input-timers=true,no-input-timeout=5000,speech-timeout=10000,channel-uuid=%s}default", session_id);
+			fst_requires(fst_core > 1)
+			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "Open recognizer\n");
+			fst_requires(switch_core_asr_open(&ah, "test", "L16", 48000, "", &flags, fst_pool) == SWITCH_STATUS_SUCCESS);
+			sprintf(input_filename, "%s", "silence_stream://100,0");
+			file_handle.channels = 1;
+			file_handle.native_rate = 48000;
+			fst_requires(switch_core_asr_load_grammar(&ah, grammar, "") == SWITCH_STATUS_SUCCESS);
+			fst_requires(switch_core_file_open(&file_handle, input_filename, file_handle.channels, 48000, SWITCH_FILE_FLAG_READ | SWITCH_FILE_DATA_SHORT, NULL) == SWITCH_STATUS_SUCCESS);
+			buf = (uint8_t *)switch_core_alloc(fst_pool, sizeof(uint8_t) * 960 * sizeof(uint16_t) * file_handle.channels);
+			fst_requires(switch_core_file_read(&file_handle, buf, &len) == SWITCH_STATUS_SUCCESS);
+			fst_requires(switch_core_asr_feed(&ah, buf, len * sizeof(int16_t), &flags) == SWITCH_STATUS_SUCCESS);
+			fst_check(ah.resampler->to_len == 320);
+			fst_requires(switch_core_file_close(&file_handle) == SWITCH_STATUS_SUCCESS);
+			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "Close recognizer\n");
+			flags = SWITCH_ASR_FLAG_NONE;
+			fst_requires(switch_core_asr_close(&ah, &flags) == SWITCH_STATUS_SUCCESS);
+		}
+		FST_TEST_END()
+	}
+	FST_SUITE_END()
+}
+FST_CORE_END()
+