本文介绍了如何在iphone中检测来自麦克风而不是语音的打击?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在使用此代码来检测打击。
i'm using this code to detect blow.
但我无法得到打击。我有声音。
but i cant get the blow. i got voice.
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。
推荐答案
你必须要玩低通结果。试试这个:
You kind of have to play with the low pass results. Try this:
- (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");
}
这篇关于如何在iphone中检测来自麦克风而不是语音的打击?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!