Examples of DSP.fft.RDFT.evaluateInverse()

DSP.fft.RDFT.evaluateInverse()
Evaluates the inverse DFT of a conjugate symmetric transform. @param X double[] containing the input transform of the sequence in conjugate symmetric packed form. @param x double[] containing the output real sequence in natural order.

    Arrays.fill( tmp, 0.0f );
    System.arraycopy( coefficients, 0, tmp, 0, coefficients.length );
    fft.evaluate( tmp, kernel );
    
    RDFT.dftProduct( kernel, transform, 1.0f );
    fft.evaluateInverse( transform, tmp );
    
    // trim off trailing zeros
    
    kernel = new double[ n ];
    System.arraycopy( tmp, 0, kernel, 0, n );

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    for ( int i = 0;  i <= nfft/2;  i++ ) {
      X[i] = (double) LP.evaluate( Math.cos( 2.0*Math.PI*i/nfft ) );
    }
    
    RDFT dft = new RDFT( log2nfft );
    dft.evaluateInverse( X, x );
    
    return x;
  }

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