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iPhone 音频工具箱中的音频电平表是什么？

发布于 2024-11-03 05:36:38 字数 37 浏览 4 评论 0原文

iPhone 音频工具箱中的音频电平表是什么？它有什么用呢？

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请叫√我孤独 2024-11-10 05:36:38

计量帮助我们在播放和录音期间获得以分贝 (dB) 为单位的音频增益。要使用它，您首先要为播放器（或录音机）启用计量，

audioPlayer.meteringEnabled  = TRUE;
[audioPlayer prepareToPlay];
[audioPlayer play];
[NSTimer scheduledTimerWithTimeInterval:1.0 
      target:self 
      selector:@selector(getGain:) 
      userInfo:nil 
      repeats:YES];

并且每当您需要增益值时，您首先调用 updateMeters 并获取 dB 值。在这里，我使用计时器来记录播放时间的每一秒的音频增益。

-(void)getGain:(NSTimer*)sender{
   [audioPlayer updateMeters];
   float avgPower = [audioPlayer averagePowerForChannel:0];
   NSLog(@"avgPower : %f",avgPower);
   float peakPower = [audioPlayer peakPowerForChannel:0];
   NSLog(@"peakPower : %f",peakPower);
}

您可以使用这些值来绘制音频波形等。请参阅此链接< /a> 寻求一些帮助..

Metering helps us to get audio gain in decibel (dB) during playing and recoring..To use it you first enable metering for the player (or recorder)

audioPlayer.meteringEnabled  = TRUE;
[audioPlayer prepareToPlay];
[audioPlayer play];
[NSTimer scheduledTimerWithTimeInterval:1.0 
      target:self 
      selector:@selector(getGain:) 
      userInfo:nil 
      repeats:YES];

and whenever you want gain Values you first call updateMeters and get the dB value. Here I am using a timer to log audio gain for every second of its playing time.

-(void)getGain:(NSTimer*)sender{
   [audioPlayer updateMeters];
   float avgPower = [audioPlayer averagePowerForChannel:0];
   NSLog(@"avgPower : %f",avgPower);
   float peakPower = [audioPlayer peakPowerForChannel:0];
   NSLog(@"peakPower : %f",peakPower);
}

You can use these value for drawing audio waveforms etc..See this link for some help for that..

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