diff --git a/app/src/main/java/com/zs/smarthuman/ui/MainActivity.kt b/app/src/main/java/com/zs/smarthuman/ui/MainActivity.kt
index 5be2903..7a2e5a6 100644
--- a/app/src/main/java/com/zs/smarthuman/ui/MainActivity.kt
+++ b/app/src/main/java/com/zs/smarthuman/ui/MainActivity.kt
@@ -268,13 +268,13 @@ class MainActivity : BaseViewModelActivity<ActivityMainBinding, MainViewModel>()
             Log.e("VoiceService", "Invalid min buffer size")
             return false
         }
-
+        val bufferSize = minBuf * 2
         audioRecord = AudioRecord(
             audioSource,
             sampleRateInHz,
             channelConfig,
             audioFormat,
-            minBuf * 2
+            bufferSize
         )
 
         if (audioRecord?.state != AudioRecord.STATE_INITIALIZED) {
@@ -304,39 +304,30 @@ class MainActivity : BaseViewModelActivity<ActivityMainBinding, MainViewModel>()
 
 
     //开始录音
-    fun startRecording() {
+    private fun startRecording() {
         if (isRecording) return
+        if (audioRecord == null && !initMicrophone()) return
 
-        if (audioRecord == null) {
-            if (!initMicrophone()) {
-                Log.e("VoiceService", "startRecording: init failed")
-                return
-            }
-        }
-
-        try {
-            audioRecord?.startRecording()
-        } catch (e: IllegalStateException) {
-            Log.e("VoiceService", "startRecording failed, recreate", e)
-            recreateAudioRecord()
-            return
-        }
-
+        try { audioRecord?.startRecording() } catch (e: IllegalStateException) { recreateAudioRecord(); return }
         isRecording = true
 
         lifecycleScope.launch(Dispatchers.IO) {
-            val buf = ShortArray(512)
+            val buf = ShortArray(1024) // 32~64ms 够低延迟
+            val floatBuf = FloatArray(buf.size)
+
             while (isRecording) {
-                val n = audioRecord?.read(buf, 0, buf.size) ?: break
-                if (n > 0) {
-                    val raw = FloatArray(n) { buf[it] / 32768f }
-                    voiceController?.acceptAudio(raw)
+                val read = audioRecord?.read(buf, 0, buf.size) ?: break
+                if (read > 0) {
+                    // 避免每次都 new FloatArray，复用
+                    for (i in 0 until read) floatBuf[i] = buf[i] / 32768f
+                    voiceController?.acceptAudio(floatBuf.copyOf(read))
                 }
             }
         }
     }
 
 
+
     private fun recreateAudioRecord() {
         stopRecording()
         try {