Exemplo n.º 1
0
 public static SignalFrame[] DivideSignalToFrames(double[] pSignal, int pSamplingRate, double pSignalLengthInMilliSeconds, double pFrameLengthinMilliSeconds)
 {
     int numberOfFrames = (int)Math.Ceiling(pSignalLengthInMilliSeconds / pFrameLengthinMilliSeconds);
     //START FIX1
     int frameSize = (int)(pSamplingRate * pFrameLengthinMilliSeconds / 1000.0);
     //END FIX1
     //Start FIX2
     int remainingDataSize = pSignal.Length - frameSize * (numberOfFrames - 1);
     int compensation = (int)(remainingDataSize / frameSize);
     numberOfFrames += compensation;
     remainingDataSize -= compensation * frameSize;
     //End FIX2
     //initialize frames.
     SignalFrame[] frames = new SignalFrame[numberOfFrames];
     for (int i = 0; i < numberOfFrames; i++)
     {
         //START: FIX1
         frames[i] = new SignalFrame();
         //END: FIX1
         frames[i].Data = new double[frameSize];
     }
     //copy data from signal to frames.
     int signalIndex = 0;
     //START FIX1
     for (int i = 0; i < numberOfFrames - 1; i++)
     {
         Array.Copy(pSignal, signalIndex, frames[i].Data, 0, frameSize);
         signalIndex += frameSize;
     }
     Array.Copy(pSignal, signalIndex, frames[numberOfFrames - 1].Data, 0, remainingDataSize);
     //END FIX1 
     return frames;
 }
        public static SignalFrame[] DivideSignalToFrames(double[] pSignal, int pSamplingRate, double pSignalLengthInMilliSeconds, double pFrameLengthinMilliSeconds)
        {
            int numberOfFrames = (int)Math.Ceiling(pSignalLengthInMilliSeconds / pFrameLengthinMilliSeconds);
            //START FIX1
            int frameSize = (int)(pSamplingRate * pFrameLengthinMilliSeconds / 1000.0);
            //END FIX1
            //Start FIX2
            int remainingDataSize = pSignal.Length - frameSize * (numberOfFrames - 1);
            int compensation      = (int)(remainingDataSize / frameSize);

            numberOfFrames    += compensation;
            remainingDataSize -= compensation * frameSize;
            //End FIX2
            //initialize frames.
            SignalFrame[] frames = new SignalFrame[numberOfFrames];
            for (int i = 0; i < numberOfFrames; i++)
            {
                //START: FIX1
                frames[i] = new SignalFrame();
                //END: FIX1
                frames[i].Data = new double[frameSize];
            }
            //copy data from signal to frames.
            int signalIndex = 0;

            //START FIX1
            for (int i = 0; i < numberOfFrames - 1; i++)
            {
                Array.Copy(pSignal, signalIndex, frames[i].Data, 0, frameSize);
                signalIndex += frameSize;
            }
            Array.Copy(pSignal, signalIndex, frames[numberOfFrames - 1].Data, 0, remainingDataSize);
            //END FIX1
            return(frames);
        }
Exemplo n.º 3
0
        public static SignalFrame[] DivideSignalToFrames(double[] pSignal, int pSamplingRate, double pSignalLengthInMilliSeconds, double pFrameLengthinMilliSeconds)
        {
            int numberOfFrames = (int)Math.Floor(pSignalLengthInMilliSeconds / pFrameLengthinMilliSeconds);

            int frameSize = (int)(pSamplingRate * pFrameLengthinMilliSeconds / 100.0);

            //initialize frames.
            SignalFrame[] frames = new SignalFrame[numberOfFrames];

            for (int i = 0; i < numberOfFrames; i++)
            {
                frames[i].Data = new double[frameSize];
            }

            //copy data from signal to frames.

            int signalIndex = 0;

            for (int i = 0; i < numberOfFrames; i++)
            {
                pSignal.CopyTo(frames[i].Data, signalIndex);
                signalIndex += frameSize;
            }

            return(frames);
        }
        //Voice Activation Detection (VAD)
        public static SignalFrame[] RemoveSilentSegments(SignalFrame[] pFrames)
        {
            double[] framesWeights = new double[pFrames.Length];
            int      frameIndex    = 0;

            foreach (SignalFrame frame in pFrames)
            {
                double squareMean      = 0;
                double avgZeroCrossing = 0;
                for (int i = 0; i < frame.Data.Length - 1; i++)
                {
                    //FIX1
                    squareMean += frame.Data[i] * frame.Data[i];
                    // avgZeroCrossing += Math.Abs(Math.Sign(frame.Data[i+1]) - Math.Sign(frame.Data[i])) / 2;
                    avgZeroCrossing += Math.Abs(Math.Abs(frame.Data[i + 1]) - Math.Abs(frame.Data[i])) / 2.0;
                }
                squareMean                 /= frame.Data.Length;
                avgZeroCrossing            /= frame.Data.Length;
                framesWeights[frameIndex++] = squareMean * (1 - avgZeroCrossing) * 1000;
            }
            double avgWeights          = mean(framesWeights);
            double stdWeights          = std(framesWeights);
            double gamma               = 0.2 * Math.Pow(stdWeights, -0.8);
            double activationThreshold = avgWeights + gamma * stdWeights;

            //threshold weights.
            threshold(framesWeights, activationThreshold);
            //smooth weights to remove short silences.
            smooth(framesWeights);
            //set anything more than 0 with 1.
            threshold(framesWeights, 0);
            int numberOfActiveFrames = (int)framesWeights.Sum();

            SignalFrame[] activeFrames      = new SignalFrame[numberOfActiveFrames];
            int           activeFramesIndex = 0;

            for (int i = 0; i < pFrames.Length; i++)
            {
                if (framesWeights[i] == 1)
                {
                    activeFrames[activeFramesIndex]      = new SignalFrame();
                    activeFrames[activeFramesIndex].Data = new double[pFrames[i].Data.Length];
                    pFrames[i].Data.CopyTo(activeFrames[activeFramesIndex].Data, 0);
                    activeFramesIndex++;
                }
            }
            return(activeFrames);
        }
Exemplo n.º 5
0
        //Voice Activation Detection (VAD)
        public static SignalFrame[] RemoveSilentSegments(SignalFrame[] pFrames)
        {
            double[] framesWeights = new double[pFrames.Length];
            int frameIndex = 0;
            foreach (SignalFrame frame in pFrames)
            {
                double squareMean = 0;
                double avgZeroCrossing = 0;
                for (int i = 0; i < frame.Data.Length - 1; i++)
                {
                    //FIX1
                    squareMean += frame.Data[i] * frame.Data[i];
                    //avgZeroCrossing += Math.Abs(Math.Sign(frame.Data[i+1]) - Math.Sign(frame.Data[i])) / 2;
                    avgZeroCrossing += Math.Abs(Math.Abs(frame.Data[i + 1]) - Math.Abs(frame.Data[i])) / 2.0;
                }
                squareMean /= frame.Data.Length;
                avgZeroCrossing /= frame.Data.Length;
                framesWeights[frameIndex++] = squareMean * (1 - avgZeroCrossing) * 1000;
            }
            double avgWeights = mean(framesWeights);
            double stdWeights = std(framesWeights);
            double gamma = 0.2 * Math.Pow(stdWeights, -0.8);
            double activationThreshold = avgWeights + gamma * stdWeights;

            //threshold weights.
            threshold(framesWeights, activationThreshold);
            //smooth weights to remove short silences.
            smooth(framesWeights);
            //set anything more than 0 with 1.
            threshold(framesWeights, 0);
            int numberOfActiveFrames = (int)framesWeights.Sum();
            SignalFrame[] activeFrames = new SignalFrame[numberOfActiveFrames];
            int activeFramesIndex = 0;
            for (int i = 0; i < pFrames.Length; i++)
            {
                if (framesWeights[i] == 1)
                {
                    activeFrames[activeFramesIndex] = new SignalFrame();
                    activeFrames[activeFramesIndex].Data = new double[pFrames[i].Data.Length];
                    pFrames[i].Data.CopyTo(activeFrames[activeFramesIndex].Data, 0);
                    activeFramesIndex++;
                }
            }
            return activeFrames;
        }