sigProcLib: Use explicit NaN check in sinc table generation
Using "x < 0.01" is a crude check for detecting NaN condition, which occurs in a sinc call when x = 0 due to divide-by-zero. Use stdlib isnan() call for this purpose. Also, as the table is created only once during initialization, use double floats for table value generation. Change-Id: I3a838fe3139fa977dfe906246020a14451185714
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@ -979,16 +979,10 @@ signalVector *modulateBurst(const BitVector &wBurst, int guardPeriodLength,
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static void generateSincTable()
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{
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float x;
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for (int i = 0; i < TABLESIZE; i++) {
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x = (float) i / TABLESIZE * 8 * M_PI;
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if (fabs(x) < 0.01) {
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sincTable[i] = 1.0f;
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continue;
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}
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sincTable[i] = sinf(x) / x;
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auto x = (double) i / TABLESIZE * 8 * M_PI;
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auto y = sin(x) / x;
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sincTable[i] = isnan(y) ? 1.0 : y;
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}
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}
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