Wie Stopp Spracherkennung auf Auto, wenn Stopp

Question

sprechen Benutzer

ich auf Bot App arbeite und ich habe hier zwei Funktionen

• Speech
• Text to Speech to Text

Beide arbeiten als erwartet, aber ich möchte erkennen, dass, wenn Benutzer zu dieser Zeit aufhören zu sprechen ich die Erkennung stoppen und diese Daten an den Server senden möchte.

Gibt es eine Möglichkeit, dass der Benutzer nicht spricht?

ich unten Code verwenden für die Spracherkennung:

// Starts an AVAudio Session 
    NSError *error; 
    AVAudioSession *audioSession = [AVAudioSession sharedInstance]; 
    [audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&error]; 
    [audioSession setActive:YES withOptions:AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation error:&error]; 

    // Starts a recognition process, in the block it logs the input or stops the audio 
    // process if there's an error. 
    recognitionRequest = [[SFSpeechAudioBufferRecognitionRequest alloc] init]; 
    AVAudioInputNode *inputNode = audioEngine.inputNode; 
    recognitionRequest.shouldReportPartialResults = YES; 
    recognitionTask = [speechRecognizer recognitionTaskWithRequest:recognitionRequest resultHandler:^(SFSpeechRecognitionResult * _Nullable result, NSError * _Nullable error) { 
     BOOL isFinal = NO; 
     if (result) { 
      // Whatever you say in the microphone after pressing the button should be being logged 
      // in the console. 
      NSLog(@"RESULT:%@",result.bestTranscription.formattedString); 
      self.inputToolbar.contentView.textView.text = result.bestTranscription.formattedString; 
      self.inputToolbar.contentView.rightBarButtonItem.enabled = YES; 
      isFinal = !result.isFinal; 
     } 
     if (error) { 
      if (audioEngine != NULL) { 
       [audioEngine stop]; 
       [inputNode removeTapOnBus:0]; 
       recognitionRequest = nil; 
       recognitionTask = nil; 
      } 
     } 
    }]; 

    // Sets the recording format 
    AVAudioFormat *recordingFormat = [inputNode outputFormatForBus:0]; //[[AVAudioFormat alloc] initStandardFormatWithSampleRate:44100 channels:1]; 
    [inputNode installTapOnBus:0 bufferSize:1024 format:recordingFormat block:^(AVAudioPCMBuffer * _Nonnull buffer, AVAudioTime * _Nonnull when) { 
     [recognitionRequest appendAudioPCMBuffer:buffer]; 
    }]; 

    // Starts the audio engine, i.e. it starts listening. 
    [audioEngine prepare]; 
    [audioEngine startAndReturnError:&error]; 
    NSLog(@"Say Something, I'm listening"); 

Lassen Sie mich wissen, wenn jemand auf diesem Detail erforderlich.

Vielen Dank im Voraus.

Answer 1

versuchen Sie es mit dieser:

AVAudioRecorder *recorder; 
NSTimer *levelTimer; 
double lowPassResults; 

-(void)configureRecorder{ 
    // AVAudioSession already set in your code, so no need for these 2 lines. 
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:nil]; 
    [[AVAudioSession sharedInstance] setActive:YES error:nil]; 

    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; 

    lowPassResults = 0; 

    recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&error]; 

    if (recorder) { 
     [recorder prepareToRecord]; 
     recorder.meteringEnabled = YES; 
     [recorder record]; 
     levelTimer = [NSTimer scheduledTimerWithTimeInterval: 0.05 target: self selector: @selector(levelTimerCallback:) userInfo: nil repeats: YES]; 
    } else 
     NSLog(@"%@", [error description]); 
    } 
} 


- (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(@"lowPassResults: %f",lowPassResults); 

    // Use here a threshold value to stablish if there is silence or speech 
    if (lowPassResults < 0.1) { 
     NSLog(@"Silence"); 
    } else if(lowPassResults > 0.5){ 
     NSLog(@"Speech"); 
    } 
} 

Referenz: http://codedrago.com/q/200783/ios-objective-c-speech-recognition-how-to-detect-speech-start-on-ios-speech-api