Merge "Tweak the SINC resampler parameters and double the performance. It's...

    // cut off frequency ratio Fc/Fs

    // The bigger the stop-band, the less coefficients we'll need.

    double Fcr = 22050.0 / 48000.0;

    double Fcr = 20000.0 / 48000.0;

    // nzc is the number of zero-crossing on one half of the filter

    int nzc = 16;

    int nzc = 8;

    // alpha parameter of the kaiser window

    // Larger numbers reduce ripples in the rejection band but increase

    //    80 dB    7.865

    //    90 dB    8.960

    //   100 dB   10.056

    double alpha = 10.056;	// -100dB stop-band attenuation

    double alpha = 7.865;	// -80dB stop-band attenuation

    // 2^nz is the number coefficients per zero-crossing

    // (int theory this should be 1<<(nc/2))