java - How can I get the ratio of two audio signals in the frequencies domain? -


i need compare 2 audio signals, signal1 , signal2. signal1 white noise. signal2 same signal of signal1, particular equalization cutting or attenuating frequencies. how can ratio of 2 audio signals in frequencies domain? (e.g.: @ frequency of 100hz, signal2 attenuated 50% compared signal1). need information process third signal applying same equalization applied transform signal1 in signal2.

i used this library process data , pass time domain frequencies domain. code same signal1 , signal2.

doublefft_1d fft1 = new doublefft_1d (fft_size); double[] input1 = new double[fft_size];  double[] fftbuff1 = new double[fft_size * 2];   this.wavfiledoubleinputstreammic.read(input1, 0, fft_size);   (int = 0; < fft_size; i++){     fftbuff1[2*i] = input1[i];     fftbuff1[2*i+1] = 0; }   fft1.complexforward(fftbuff1);

how can use fft results (from signal1 , signal2) reach goal?

you need calculate magnitude of each signal in frequency domain power spectrum estimate each, , divsion, i.e.

  • get signal 1 , signal 2
  • apply suitable window function both signals (e.g. von hann)
  • apply fft windowed signals
  • calculate magnitude of fft output, mag = sqrt(re*re+im*im) - gives real-valued power spectrum
  • divide power spectrum of signal 1 power spectrum of signal 2 real-valued ratio versus frequency

to apply correction signal 3 can use overlap-add or overlap-save method - take fft of signal3, multiply each complex value real value obtained above, use inverse fft time domain. slight complication need overlap successive sample windows , process overlap correctly (see links overlap-add/overlap-save methods above.)


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