音频重新编码的语音质量不好

// Init audio with record capability 
audioSession = [AVAudioSession sharedInstance]; 
[audioSession setActive:YES error:nil]; 
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil]; 

NSMutableDictionary *recordSettings = [[NSMutableDictionary alloc] initWithCapacity:10]; 
if(recordEncoding == ENC_PCM) 
{ 
    [recordSettings setObject:[NSNumber numberWithInt: kAudioFormatLinearPCM] forKey: AVFormatIDKey]; 
    [recordSettings setObject:[NSNumber numberWithFloat:44100.0] forKey: AVSampleRateKey]; 
    [recordSettings setObject:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey]; 
    [recordSettings setObject:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey]; 
    [recordSettings setObject:[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey]; 
    [recordSettings setObject:[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey]; 
} 
else 
{ 
    NSNumber *formatObject; 

    switch (recordEncoding) { 
     case (ENC_AAC): 
      formatObject = [NSNumber numberWithInt: kAudioFormatMPEG4AAC]; 
      break; 
     case (ENC_ALAC): 
      formatObject = [NSNumber numberWithInt: kAudioFormatAppleLossless]; 
      break; 
     case (ENC_IMA4): 
      formatObject = [NSNumber numberWithInt: kAudioFormatAppleIMA4]; 
      break; 
     case (ENC_ILBC): 
      formatObject = [NSNumber numberWithInt: kAudioFormatiLBC]; 
      break; 
     case (ENC_ULAW): 
      formatObject = [NSNumber numberWithInt: kAudioFormatULaw]; 
      break; 
     default: 
      formatObject = [NSNumber numberWithInt: kAudioFormatAppleIMA4]; 
    } 

    [recordSettings setObject:formatObject forKey: AVFormatIDKey]; 
    [recordSettings setObject:[NSNumber numberWithFloat:44100.0] forKey: AVSampleRateKey]; 
    [recordSettings setObject:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey]; 
    [recordSettings setObject:[NSNumber numberWithInt:12800] forKey:AVEncoderBitRateKey]; 
    [recordSettings setObject:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey]; 
    [recordSettings setObject:[NSNumber numberWithInt: AVAudioQualityHigh] forKey: AVEncoderAudioQualityKey]; 
}

来源

2011-05-07 korat prashant

代码工作，但语音质量不达标标记请帮助我谢谢 – 2011-05-07 04:21:11

尝试记录与此问题的设置：

iphone-peakPowerForChannel function in AVAudioRecorder doesn't work

的设置使用似乎有从你使用的手机有点不同。

来源

2011-05-07 04:53:40 MusiGenesis

使用此recoed设置AVAudioRecorder ....

recordSetting = [[NSMutableDictionary alloc] init]; 
[recordSetting setValue :[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey]; 
[recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey]; 
[recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey]; 
[recordSetting setValue :[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey]; 
[recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey]; 
[recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];

它的工作，我都做到了......

问候

来源

2011-05-07 07:47:06

它的工作，但我的问题是，录制完成后，整个应用程序的声音是非常低 – 2011-05-07 09:00:14

雅，DUDE ..但检查有关录制你之前创建的字典..而且我只发布录音字典..之后你需要在AVAudioRecorder使用dictionnary .. – 2011-05-07 09:30:01

雅亲爱的我已经添加字典在avrecorder，但问题相同，请帮助，如果你有任何想法谢谢 – 2011-05-07 11:00:27

音频重新编码的语音质量不好

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