1

keyBoard/Class/AiTalk/VM/AudioSessionManager.m

@@ -141,7 +141,7 @@
 
   // 配置为录音+播放模式
   // Category: PlayAndRecord - 同时支持录音和播放
-  // Mode: VoiceChat - 优化语音通话场景
+  // Mode: VoiceChat - 允许系统进行 AGC/降噪，提升输入音量
   // Options:
   //   - DefaultToSpeaker: 默认使用扬声器
   //   - AllowBluetooth: 允许蓝牙设备
@@ -162,6 +162,31 @@
     return NO;
   }
 
+  // 优先使用后端要求的采样率和缓冲时长，减少重采样误差
+  NSError *sampleRateError = nil;
+  [session setPreferredSampleRate:16000 error:&sampleRateError];
+  if (sampleRateError) {
+    NSLog(@"[AudioSessionManager] Failed to set sample rate: %@",
+          sampleRateError.localizedDescription);
+  }
+
+  NSError *bufferError = nil;
+  [session setPreferredIOBufferDuration:0.02 error:&bufferError];
+  if (bufferError) {
+    NSLog(@"[AudioSessionManager] Failed to set IO buffer: %@",
+          bufferError.localizedDescription);
+  }
+
+  if ([session respondsToSelector:@selector(setPreferredInputNumberOfChannels:
+                                                    error:)]) {
+    NSError *channelsError = nil;
+    [session setPreferredInputNumberOfChannels:1 error:&channelsError];
+    if (channelsError) {
+      NSLog(@"[AudioSessionManager] Failed to set input channels: %@",
+            channelsError.localizedDescription);
+    }
+  }
+
   return YES;
 }
 
@@ -206,6 +231,15 @@
     return NO;
   }
 
+  if (session.isInputGainSettable) {
+    NSError *gainError = nil;
+    [session setInputGain:1.0 error:&gainError];
+    if (gainError) {
+      NSLog(@"[AudioSessionManager] Failed to set input gain: %@",
+            gainError.localizedDescription);
+    }
+  }
+
   self.isSessionActive = YES;
   return YES;
 }