diff --git a/human/audio_mal_handler.py b/human/audio_mal_handler.py
index bb78507..43104cf 100644
--- a/human/audio_mal_handler.py
+++ b/human/audio_mal_handler.py
@@ -79,7 +79,6 @@ class AudioMalHandler(AudioHandler):
         # print(mel.shape[0],mel.shape,len(mel[0]),len(self.frames))
         # cut off stride
         left = max(0, self._context.stride_left_size * 80 / self._context.fps)
-        right = min(len(mel[0]), len(mel[0]) - self._context.stride_right_size * 80 / 50)
         mel_idx_multiplier = 80. * 2 / self._context.fps
         mel_step_size = 16
         i = 0
diff --git a/human/human_context.py b/human/human_context.py
index 585803f..6d55e8e 100644
--- a/human/human_context.py
+++ b/human/human_context.py
@@ -18,11 +18,10 @@ class HumanContext:
     def __init__(self):
         self._fps = 50  # 20 ms per frame
         self._image_size = 288
-        self._batch_size = 16
+        self._batch_size = 6
         self._sample_rate = 16000
-        self._stride_left_size = 10
-        self._stride_right_size = 10
-        self._render_batch = 5
+        self._stride_left_size = 4
+        self._stride_right_size = 4
 
         self._asr = None
         self._nlp = None
@@ -62,10 +61,6 @@ class HumanContext:
     def image_size(self):
         return self._image_size
 
-    @property
-    def render_batch(self):
-        return self._render_batch
-
     @property
     def device(self):
         return self._device
diff --git a/human/human_render.py b/human/human_render.py
index 0c9a25c..efe3a63 100644
--- a/human/human_render.py
+++ b/human/human_render.py
@@ -52,11 +52,11 @@ class HumanRender(AudioHandler):
             if self._render_status is RenderStatus.E_Empty:
                 continue
             real_delay = delay - use
-            print(f'send voice {use}')
+            # print(f'send voice {use}')
             if real_delay > 0:
                 time.sleep(real_delay)
-            else:
-                print(f'send voice {real_delay}')
+            # else:
+            #     print(f'send voice {real_delay}')
 
         logging.info('human render exit')
 
diff --git a/ui/ipc_render.py b/ui/ipc_render.py
index a15229e..44035dd 100644
--- a/ui/ipc_render.py
+++ b/ui/ipc_render.py
@@ -49,17 +49,23 @@ class IpcRender(HumanRender):
 
     def _on_reader_callback(self, data_str, size):
         data_str = data_str.decode('utf-8')
-        print(f'on_reader_callback: {data_str}, size:{size}')
+        # print(f'on_reader_callback: {data_str}, size:{size}')
         if 'quit' == data_str:
             self._context.stop()
         elif 'heartbeat' == data_str:
             pass
         elif 'full' == data_str:
-            self._render_status = RenderStatus.E_Full
+            if self._render_status != RenderStatus.E_Full:
+                logger.info(f'change to E_Full status')
+                self._render_status = RenderStatus.E_Full
         elif 'empty' == data_str:
-            self._render_status = RenderStatus.E_Empty
+            if self._render_status != RenderStatus.E_Empty:
+                logger.info(f'change to E_Full status')
+                self._render_status = RenderStatus.E_Empty
         elif 'normal' == data_str:
-            self._render_status = RenderStatus.E_Normal
+            if self._render_status != RenderStatus.E_Normal:
+                logger.info(f'change to E_Normal status')
+                self._render_status = RenderStatus.E_Normal
 
     def run(self):
         self._ipc.set_reader_callback(self._on_reader_callback)