如何在我的iPhone应用程序中检测语音?
问题描述:
我想在语音检测方面采取一些方法。
I want to fire some method on voice detection.
例如,
就像在 PragDuck
app,当用户开始讲话时 duck
开始动画。
Just like in PragDuck
app, When user starts speaking duck
starts its animation.
如何检测用户的语音?
答
使用AVAudioRecorder - 音频计量 - 结帐本教程 - 当用户吹入麦克风时取消 http://mobileorchard.com/tutorial-detecting-when-a-user-blows-into-the-mic/
Use AVAudioRecorder - Audio Metering - checkout out this tutorial - dettect when a user blows into mic http://mobileorchard.com/tutorial-detecting-when-a-user-blows-into-the-mic/
快速示例:
_audioRecorder.meteringEnabled = YES;
//1. This method will get the current mic activity and will format it to a 0 - 1 scale.
-(void)checkRecordingMeters:(NSTimer *)timer
{
[_audioRecorder updateMeters];
const double ALPHA = 0.2;
float peakPower = [_audioRecorder peakPowerForChannel:0];
double peakPowerForChannel = pow(10, (0.05 * peakPower));
lowPassResults = ALPHA * peakPowerForChannel + (1.0 - ALPHA) * lowPassResults;
NSLog(@"Meters: %f" , peakPower);
NSLog(@"lowPassResults: %f \n" , lowPassResults);
}
//2. Call this method to run a loop timer to check the current mic activity
-(void)enableMettering:(BOOL)enable
{
if(enable)
{
levelTimer = [[NSTimer scheduledTimerWithTimeInterval:0.03
target:self
selector:@selector(checkRecordingMeters:)
userInfo:nil
repeats:YES] retain];
}
else
{
[levelTimer invalidate];
[levelTimer release];
}
}