如何在iphone中检测来自麦克风而不是语音的打击？

概述我正在使用此代码来检测打击. 但我不能受到打击.我有声音 NSURL *url = [NSURL fileURLWithPath:@"/dev/null"];NSDictionary *settings = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithFloa 我正在使用此代码来检测打击.

但我不能受到打击.我有声音

NSURL *url = [NSURL fileURLWithPath:@"/dev/null"];NSDictionary *settings = [NSDictionary dictionaryWithObjectsAndKeys:                          [NSNumber numberWithfloat: 44100.0],AVSampleRateKey,[NSNumber numberWithInt: kAudioFormatAppleLossless],AVFormatIDKey,[NSNumber numberWithInt: 1],AVNumberOfChannelsKey,[NSNumber numberWithInt: AVAudioQualityMax],AVEncoderAudioQualityKey,nil];NSError *error;recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&error];if (recorder) {    [recorder preparetoRecord];    recorder.meteringEnabled = YES;    [recorder record];    levelTimer = [NSTimer scheduledTimerWithTimeInterval: 0.3 target: self selector: @selector(levelTimerCallback:) userInfo: nil repeats: YES];} else    NSLog(@"error %@",[error description]);

但声音没有打击.

解决方法 你必须要玩低通结果.试试这个：

- (voID)levelTimerCallback:(NSTimer *)timer {    [recorder updateMeters];    const double Alpha = 0.05;    double peakPowerForChannel = pow(10,(0.05 * [recorder peakPowerForChannel:0]));    lowPassResults = Alpha * peakPowerForChannel + (1.0 - Alpha) * lowPassResults;      //NSLog(@"%f",lowPassResults);    if (lowPassResults > 0.55)        NSLog(@"Mic blow detected");}

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