Detect blow in Mic and do something {iPhone SDK}
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Published on 2010-04-11T19:07:33Z
Indexed on
2010/04/11
19:13 UTC
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Hi , i found this tutorial , and it's good , but doesn't work for me !
here is the code :
- (void)listenForBlow:(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;
if (lowPassResults > 0.95)
NSLog(@"Mic blow detected");
//change the background color e.g !
}
in the console show me the nslog reseult like this (without any bowling !):
2010-04-11 23:32:27.935 MicBlow[2358:207] Mic blow detected
2010-04-11 23:32:27.965 MicBlow[2358:207] Mic blow detected
2010-04-11 23:32:27.995 MicBlow[2358:207] Mic blow detected
2010-04-11 23:32:28.026 MicBlow[2358:207] Mic blow detected
2010-04-11 23:32:28.055 MicBlow[2358:207] Mic blow detected
2010-04-11 23:32:28.086 MicBlow[2358:207] Mic blow detected
2010-04-11 23:32:28.115 MicBlow[2358:207] Mic blow detected
2010-04-11 23:32:28.145 MicBlow[2358:207] Mic blow detected
2010-04-11 23:32:28.175 MicBlow[2358:207] Mic blow detected
2010-04-11 23:32:28.205 MicBlow[2358:207] Mic blow detected
2010-04-11 23:32:28.236 MicBlow[2358:207] Mic blow detected
i change this value :
if (lowPassResults < 0.95)
to
if (lowPassResults > 0.95)
so it seems work ! but doesn't chage anything , again if i put the background changing code the , my code change background but without any bowling !! what's the problem ?
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