diff --git a/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/dnr_dsp.c b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/dnr_dsp.c
index 7a88951..c489460 100644
--- a/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/dnr_dsp.c
+++ b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/dnr_dsp.c
@@ -15,33 +15,35 @@
 #include "debug_print.h"
 
 unsigned  g_dsp_eof = 0;
+
 void dnr_exchange_buffer(int32_t *data) {
+#if XMOS_NS_EN || DNR_50MS || DNR_11MS
     static unsigned buff_index = 0;
-    write_to_sample_in_buf(data[1], buff_index, 0);
-    read_from_sample_out_buf(&data[1],buff_index, 0);
+    unsigned out_sample = 0;
+    write_to_sample_in_buf((unsigned)data[1], buff_index, 0);
+    read_from_sample_out_buf(&out_sample, buff_index, 0);
+    data[1] = (int32_t)out_sample;
     data[0] = data[1];
 
     buff_index++;
-#if DNR_11MS
-    if (buff_index == 128)
+    /* 改动原因：XMOS NS 块长 1024，满帧后轮转 triple-buffer 并通知 tile0 处理任务。 */
+    if (buff_index == DNR_DSP_FRAME_SIZE)
     {
-#else
-    if (buff_index == 512)
-    {
-#endif
         buf_slot_rotate();
         buff_index = 0;
         SET_SHARED_GLOBAL(g_dsp_eof, 1);
     }
+#else
+    /* 改动原因：未启用 NS/DNR 时直通，保持 extra_i2s 链接符号可用。 */
+    data[0] = data[1];
+#endif
 }
 
-
-void Aizip_DNR_init(void);
-
 void dnr_dsp_proc_task(void)
 {
-#if DNR_50MS || DNR_11MS
-    Aizip_DNR_init();
+#if XMOS_NS_EN || DNR_50MS || DNR_11MS
+    /* 改动原因：由 Aizip_DNR_init 替换为 xmos_ns_init，对接 libxmos_ns.a。 */
+    xmos_ns_init();
     while(1) {
         unsigned dsp_eof = 0;
         GET_SHARED_GLOBAL(dsp_eof, g_dsp_eof);
diff --git a/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/dnr_dsp_buf.c b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/dnr_dsp_buf.c
index 3a4336b..0c0fd0e 100644
--- a/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/dnr_dsp_buf.c
+++ b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/dnr_dsp_buf.c
@@ -13,18 +13,23 @@
 #include <platform.h>
 #include <string.h>
 #include "dnr_dsp_buf.h"
-#include "aizip_dnr.h"
 #include "debug_print.h"
+
+#if XMOS_NS_EN
+#include "ns_api.h"
+#elif defined(DNR_50MS) || defined(DNR_11MS)
+#include "aizip_dnr.h"
 #include "flash.h"
 #include "swlock.h"
-
-// Global flash lock defined in lfs_services.c — protects all flash hardware access
 extern swlock_t flash_lock;
+#endif
 
-//for AGC
-//static agc_stage_ctx_t DWORD_ALIGNED agc_stage_state = {};
-
-static unsigned __attribute__((aligned (4))) dsp_dnr_frame_buf[BUF_SLOT_NUM][DSP_CH_NUM][DNR_DSP_FRAME_SIZE];
+/* 改动原因：XMOS NS 使用 int16 样点缓冲；原 Aizip DNR 使用 unsigned 32bit 缓冲。 */
+#if XMOS_NS_EN
+static int16_t __attribute__((aligned(8))) dsp_dnr_frame_buf[BUF_SLOT_NUM][DSP_CH_NUM][DNR_DSP_FRAME_SIZE];
+#else
+static unsigned __attribute__((aligned(4))) dsp_dnr_frame_buf[BUF_SLOT_NUM][DSP_CH_NUM][DNR_DSP_FRAME_SIZE];
+#endif
 
 unsigned sample_in_buf_slot=0;
 unsigned processing_buf_slot=2;
@@ -57,13 +62,56 @@ void buf_slot_rotate()
 
 void write_to_sample_in_buf(unsigned data, unsigned index, unsigned ch)
 {
+#if XMOS_NS_EN
+    /* 改动原因：USB 24bit 样点存于 int32 高 24 位，右移 16 位得到 int16 送入 NS。 */
+    dsp_dnr_frame_buf[sample_in_buf_slot][ch][index] = (int16_t)((int32_t)data >> 16);
+#else
     dsp_dnr_frame_buf[sample_in_buf_slot][ch][index]=data;
+#endif
 }
 
 void read_from_sample_out_buf(unsigned* read_data, unsigned index, unsigned ch)
 {
+#if XMOS_NS_EN
+    /* 改动原因：NS 输出 int16 左移 16 位还原为 USB 32bit 样点格式。 */
+    *read_data = (unsigned)((int32_t)dsp_dnr_frame_buf[sample_out_buf_slot][ch][index] << 16);
+#else
     *read_data = dsp_dnr_frame_buf[sample_out_buf_slot][ch][index];
+#endif
 }
+
+#if XMOS_NS_EN
+
+unsigned ns_init_flag = 0;
+
+void xmos_ns_init(void)
+{
+    ns_xmos_xc_init();
+    /* 改动原因：仅启用 NS 降噪，关闭 NS 库内 EQ，避免与主 EQ 引擎冲突。 */
+    ns_xmos_xc_set_module_enable(1, 0);
+    int16_t gains_zero[10] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+    ns_xmos_xc_eq_set_all_gains(gains_zero);
+    ns_init_flag = 1;
+    debug_printf("XMOS NS init done\n");
+}
+
+void start_dsp_processing(void)
+{
+    int16_t __attribute__((aligned(8))) ns_in[DNR_DSP_FRAME_SIZE];
+    int16_t __attribute__((aligned(8))) ns_out[DNR_DSP_FRAME_SIZE];
+
+    /* 改动原因：从 processing slot 取出 1024 样点单声道数据，调用 ns_xmos_xc_process 处理后写回。 */
+    memcpy(ns_in, &dsp_dnr_frame_buf[processing_buf_slot][0][0],
+           DNR_DSP_FRAME_SIZE * sizeof(int16_t));
+
+    ns_xmos_xc_process(ns_in, ns_out);
+
+    memcpy(&dsp_dnr_frame_buf[processing_buf_slot][0][0], ns_out,
+           DNR_DSP_FRAME_SIZE * sizeof(int16_t));
+}
+
+#elif defined(DNR_50MS) || defined(DNR_11MS)
+
 #if DNR_11MS
 int8_t buffer[4208] __attribute__((aligned(4)));
 int8_t buffer2[31136] __attribute__((aligned(4)));
@@ -79,27 +127,22 @@ azp_dnr_param_t pram = {
     .sample_rate = 48000};
 
 unsigned dnr_init_flag = 0;
-void Aizip_DNR_init(void)
-{
-#if DNR_50MS || DNR_11MS
-    delay_microseconks(10000);
-   // setFlashPortPins(XS1_PORT_1B,XS1_PORT_1C,XS1_PORT_4B, XS1_CLKBLK_3);
 
+void xmos_ns_init(void)
+{
+    delay_microseconds(10000);
     swlock_acquire(&flash_lock);
     int sta = AI_DNR_init(&pram);
     swlock_release(&flash_lock);
     dnr_init_flag = 1;
     debug_printf("AI_DNR_init status %d\n", sta);
-#endif
 }
 
 void start_dsp_processing(void)
 {
-#if DNR_50MS || DNR_11MS
     float level = -200;
-
     setNoisy_mix_factor(level);
-
     AI_DNR_Processing((int32_t *)&dsp_dnr_frame_buf[processing_buf_slot][0][0]);
-#endif
 }
+
+#endif
diff --git a/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/dnr_dsp_buf.h b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/dnr_dsp_buf.h
index 61d2edd..1ccdb82 100644
--- a/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/dnr_dsp_buf.h
+++ b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/dnr_dsp_buf.h
@@ -10,11 +10,16 @@
 #include <platform.h>
 #include <xcore/chanend.h>
 #include <xcore/channel.h>
-#if DNR_11MS
+
+/* 改动原因：XMOS_NS_EN 时单帧 1024 样点，替代原 DNR_50MS(512)/DNR_11MS(128) 帧长。 */
+#if XMOS_NS_EN
+#define DNR_DSP_FRAME_SIZE 1024
+#elif DNR_11MS
 #define DNR_DSP_FRAME_SIZE 128
 #else
 #define DNR_DSP_FRAME_SIZE 512
 #endif
+
 #define BUF_SLOT_NUM    3   //one for input, one for output, one for processing
 #define DSP_CH_NUM      2
 
@@ -30,10 +35,10 @@ void write_to_sample_in_buf(unsigned data, unsigned index, unsigned ch);
 void read_from_sample_out_buf(unsigned* read_data, unsigned index, unsigned ch);
 
 void start_dsp_processing(void);
-void Aizip_DNR_init(void);
+/* 改动原因：Aizip_DNR_init 更名为 xmos_ns_init，对接 libxmos_ns.a。 */
+void xmos_ns_init(void);
 
 #if __XC__
 } //extern c
 #endif
 #endif //RINGBUFFER_H
-
diff --git a/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/libxmos_ns.a b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/libxmos_ns.a
new file mode 100644
index 0000000..db6734c
Binary files /dev/null and b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/libxmos_ns.a differ
diff --git a/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/ns_api.h b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/ns_api.h
new file mode 100644
index 0000000..37d196f
--- /dev/null
+++ b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/dnr/ns_api.h
@@ -0,0 +1,33 @@
+#ifndef __NS_API_H__
+#define __NS_API_H__
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* 改动原因：由 Aizip DNR 切换为 XMOS NS 库，初始化 NS 处理链及默认运行状态。 */
+void ns_xmos_xc_init(void);
+
+/*
+ * 改动原因：运行时控制 NS/EQ 子模块开关；C1 仅使用 NS，EQ 由主 EQ 引擎处理故 eq_enable=0。
+ * ns_enable: 0 旁路 NS，非 0 开启
+ * eq_enable: 0 旁路 NS 内建 EQ，非 0 开启
+ */
+void ns_xmos_xc_set_module_enable(int ns_enable, int eq_enable);
+
+/* 改动原因：NS 库内建 10 段 EQ 增益设置，C1 默认全 0 旁路。 */
+void ns_xmos_xc_eq_set_all_gains(int16_t *gains);
+void ns_xmos_xc_eq_set_band_gain(int band, int16_t gain);
+
+/*
+ * 改动原因：单声道处理，block 长度 1024 Samples（用户指定，替代原 DNR 512/128 帧）。
+ */
+void ns_xmos_xc_process(int16_t *input, int16_t *output);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/extra_i2s.xc b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/extra_i2s.xc
index 247e6bc..d76fa90 100644
--- a/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/extra_i2s.xc
+++ b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/extra_i2s.xc
@@ -15,48 +15,21 @@
 #include "xc_ptr.h"
 #include "tile1_clk.h"
 
-#if BR_UAC2
-unsigned g_3d_fps = 2;
-#elif XMOS_FPS_EN
+#if XMOS_FPS_EN
 unsigned g_3d_fps = 1;
 #else
 unsigned g_3d_fps = 0;
 #endif
 
+/* 改动原因：factory 无 UAC1 时 UserBufferManagement 不编译，但 user_main 仍赋值 uc_br_data，须全局定义避免链接错误 */
+unsafe chanend uc_br_data;
+
 /* TODO
     - Seperate recording and playback SRC related defines
 */
 #if UAC1
 
-#ifndef USE_ASRC
-#define USE_ASRC (0)//(0)
-#endif
-
-#define DISABLE_ASRC_HIGHER_THAN_192000 1
-
-#ifndef EXTRA_I2S_CHAN_COUNT_IN
-#define EXTRA_I2S_CHAN_COUNT_IN  (2)
-#endif
-
-#ifndef EXTRA_I2S_CHAN_INDEX_IN
-#define EXTRA_I2S_CHAN_INDEX_IN  (0)//(0)
-#endif
-
-#ifndef EXTRA_I2S_CHAN_COUNT_OUT
-#define EXTRA_I2S_CHAN_COUNT_OUT (0)
-#endif
-
-#ifndef EXTRA_I2S_CHAN_INDEX_OUT
-#define EXTRA_I2S_CHAN_INDEX_OUT (0)//(0)
-#endif
-
-#define DATA_BITS                (32)
-
-#define SAMPLE_FREQUENCY         (48000)
-#define MASTER_CLOCK_FREQUENCY   (24576000)
-
 unsafe chanend uc_i2s;
-unsafe chanend uc_br_data;
 
 /* Note, re-using I2S data lines on MC audio board for LR and Bit clocks */
 
@@ -95,12 +68,7 @@ void UserBufferManagement(unsigned sampsFromUsbToAudio[], unsigned sampsFromAudi
         GET_SHARED_GLOBAL(tile1_ready, g_tile1_audio_ready);
 #endif
 
-        if (l_3d_fps == 2)
-        {
-            if (tile1_ready)
-                buffer_exchange((chanend) uc_br_data, sampsFromUsbToAudio, sampsFromAudioToUsb, NUM_USB_CHAN_OUT);
-        } 
-        else if (l_3d_fps == 1)
+        if (l_3d_fps == 1)
         {
             if (tile1_ready)
                 buffer_exchange((chanend)uc_br_data, sampsFromUsbToAudio, sampsFromAudioToUsb, 2);
@@ -108,22 +76,14 @@ void UserBufferManagement(unsigned sampsFromUsbToAudio[], unsigned sampsFromAudi
 
         if (dnr_enable)
         {
-            dnr_exchange_buffer((int32_t *)&sampsFromAudioToUsb[EXTRA_I2S_CHAN_INDEX_IN]);
+            dnr_exchange_buffer((int32_t *)&sampsFromAudioToUsb[0]);
         }
         else
         {
             sampsFromAudioToUsb[0] = sampsFromAudioToUsb[1];
         }
         
-        if (adc_loop)
-        {
-       //     sampsFromUsbToAudio[0] = (sampsFromAudioToUsb[1]) + (sampsFromUsbToAudio[0]);
-       //     sampsFromUsbToAudio[1] = (sampsFromAudioToUsb[1]) + (sampsFromUsbToAudio[1]);
-        }
-
-       // sampsFromAudioToUsb[0] =  sampsFromUsbToAudio[0];
-       // sampsFromAudioToUsb[0] =  tmp;
-    }
+   }
 #endif
 }
 #endif
diff --git a/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/fps_wrapper.c b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/fps_wrapper.c
index 0f9d0c4..c82ef23 100644
--- a/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/fps_wrapper.c
+++ b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/fps_wrapper.c
@@ -10,8 +10,10 @@
 #include "xc_ptr.h"
 
 #include "xua_conf.h"
-/* 改动原因：FPS库V1.5改为单核xc接口，使用fps_api.h中的fps_xmos_xc_*声明 */
+#if XMOS_FPS_EN
+/* 改动原因：FPS库V1.5改为单核xc接口，使用fps_api.h中的fps_xmos_xc_*声明；factory 不链接 libxmos_fps 故不编译 */
 #include "fps_api.h"
+#endif
 #include "fps_eq_sync.h"
 
 
@@ -97,6 +99,8 @@ void fps_eq_publish_mode_and_gains(unsigned mode, const int16_t gains[FPS_EQ_BAN
     fps_eq_publish_gains_to_shared(gains);
 }
 
+#if XMOS_FPS_EN
+
 void fps_apply_eq_mode(void)
 {
     int16_t gains[FPS_EQ_BAND_COUNT];
@@ -257,4 +261,6 @@ void fps1_dsp_proc_task()
             SET_SHARED_GLOBAL(fps_buf_ready, 0);
         }
     }
-}
\ No newline at end of file
+}
+
+#endif /* XMOS_FPS_EN */
\ No newline at end of file
diff --git a/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/main.xc b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/main.xc
index fe94159..25fb3a2 100644
--- a/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/main.xc
+++ b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/main.xc
@@ -520,6 +520,14 @@ int main()
     {
         USER_MAIN_CORES
 
+#if XMOS_NS_EN
+        /* 改动原因：XMOS NS 降噪在 tile[0] 独立核运行，与 extra_i2s 的 triple-buffer 配合处理 1024 样点块。 */
+        on tile[0]: {
+            set_core_high_priority_on();
+            dnr_dsp_proc_task();
+        }
+#endif
+
 #if XMOS_FPS_EN
         on tile[1]: {
             debug_printf("start fps_main\n");
@@ -532,12 +540,6 @@ int main()
             set_core_high_priority_on();
             fps1_dsp_proc_task();
         }
-#else
-#if UAC1
-        on tile[1]: {
-            dsp_main(c_data_transport, cc_br_eof);
-        }
-#endif
 #endif
 #if (((XUA_SYNCMODE == XUA_SYNCMODE_SYNC  && !XUA_USE_SW_PLL) || XUA_SPDIF_RX_EN || XUA_ADAT_RX_EN))
         on tile[PLL_REF_TILE]: PllRefPinTask(i_pll_ref, p_pll_ref);
diff --git a/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/user_main.h b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/user_main.h
index a107a04..665aa6a 100644
--- a/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/user_main.h
+++ b/sw_usb_audio/app_usb_aud_fosi_c1/src/extensions/user_main.h
@@ -3,7 +3,6 @@
 #define _USER_MAIN_H_
 
 #ifdef __XC__
-#if (!MQA_EN)
 
 #include "app_dsp.h"
 // 改动原因：mode/mic mute LED物理端口在tile1，定义跨tile的LED控制interface，供tile0按键逻辑调用，tile1统一驱动硬件LED。
@@ -13,8 +12,7 @@ interface c1_led_ctrl_if {
     // 改动原因：规格 mic 指示灯仅反映静音——0=静音红灯常亮，1=非静音全灭；DNR 无灯由 APP 显示。
     void set_mic_mute_state(unsigned mute_switch);
 };
-void switch_handler(void);
-void flag_handler();
+
 /* 改动原因：固件升级 START 在 AudioHwRemote2 处理，需传入 c_dfu；其余升级命令在 process_send_params 直接处理 */
 void AudioHwRemote(streaming chanend c, client interface c1_led_ctrl_if i_c1_led_ctrl, streaming chanend c_dfu, chanend c_app_sync);
 void i2s_driver(chanend c);
@@ -55,7 +53,7 @@ extern unsigned g_fps_drc_mode;
                                         unsafe { \
                                         uc_audiohw = (chanend) c_audiohw;\
                                         uc_dfu = (chanend) c_dfu;\
-                                        /* 改动原因：FPS/BR 音频经 c_data_transport 与 tile1 fps_main 交换；未赋值 uc_br_data 会导致 UserBufferManagement buffer_exchange ECALL */\
+                                        /* 改动原因：FPS/BR 音频经 c_data_transport 与 tile1 fps_main 交换；factory 亦定义 uc_br_data 占位，避免链接错误 */\
                                         uc_br_data = (chanend) c_data_transport;\
                                         } \
                                     }\
@@ -65,11 +63,6 @@ extern unsigned g_fps_drc_mode;
                         on tile[1]: app_control_slave(i_c1_led_ctrl, c_app_sync); \
 \
 
-#else
-
-#define USER_MAIN_DECLARATIONS_A 
-#define USER_MAIN_CORES_A // on tile[0]:{board_setup();}
-#endif
 
 #endif