我正在制作一个应用程序，我需要使用 iPhone 的内置麦克风在房间里听到非常微弱的声音。
如何使 AVAudioRecorder 对小或微弱的噪音更敏感？我需要使用的设置有什么建议吗？
目前我正在使用它来启动我的 AVAudioRecorder
NSArray *dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docsDir = [dirPaths objectAtIndex:0];
NSString *soundFilePath = [docsDir stringByAppendingPathComponent:str2];
NSURL *soundFileURL = [NSURL fileURLWithPath:soundFilePath];
NSDictionary *recordSettings = [NSDictionary
dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:AVAudioQualityHigh],
AVEncoderAudioQualityKey,
[NSNumber numberWithInt:16],
AVEncoderBitRateKey,
[NSNumber numberWithInt: 2],
AVNumberOfChannelsKey,
[NSNumber numberWithFloat:44100.0],
AVSampleRateKey,
nil];
NSError *error = nil;
audioRecorder = [[AVAudioRecorder alloc]
initWithURL:soundFileURL
settings:recordSettings
error:&error];
if (error)
{
NSLog(@"error: %@", [error localizedDescription]);
}
else
{
[audioRecorder prepareToRecord];
}
if (!audioRecorder.recording)
{
[audioRecorder record];
}