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Commit 712205bd authored by Glenn Kasten's avatar Glenn Kasten Committed by Android Git Automerger
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am 5e8e3fc3: Merge "fix a few small typos in the FIR computation" 

* commit '5e8e3fc3':
  fix a few small typos in the FIR computation
parents fd513006 5e8e3fc3

tools/resampler_tools/fir.cpp

+2 −6
Original line number Diff line number Diff line
@@ -78,10 +78,9 @@ int main(int argc, char** argv) 
    const int nz = 4;

    

    // total number of coefficients

    const int N = (1 << 4) * nzc;

    const int N = (1 << nz) * nzc;



    // generate the right half of the filter



    printf("const int32_t RESAMPLE_FIR_SIZE           = %d;\n", N);

    printf("const int32_t RESAMPLE_FIR_NUM_COEF       = %d;\n", nzc);

    printf("const int32_t RESAMPLE_FIR_COEF_BITS      = %d;\n", nc);
@@ -91,19 +90,16 @@ int main(int argc, char** argv) 
    printf("static int16_t resampleFIR[%d] = {", N);

    for (int i=0 ; i<N ; i++)

    {

        double x = (2.0 * M_PI * i * Fcr) / (1 << 4);

        double x = (2.0 * M_PI * i * Fcr) / (1 << nz);

        double y = kaiser(i+N, 2*N, alpha) * sinc(x);



        int yi = floor(y * (1<<(nc-1)) + 0.5);

        if (yi >= (1<<(nc-1))) yi = (1<<(nc-1))-1;        



        //printf("%6d\n", yi);



        if ((i % (1 << 4)) == 0) printf("\n    ");

        printf("0x%04x, ", yi & 0xFFFF);

    }

    printf("\n};\n");



    return 0;

 }

 
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