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8bit quantization #8

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CornN64 opened this issue Jul 1, 2021 · 0 comments

CornN64 commented Jul 1, 2021

To improve the 8bit quantization in the RTL mode with ½ LSB and round it to the nearest LSB I would suggest to replace the lines

*(data++) = (unsigned char)(((*xi << sample_shift) >> 8) + 128);
*(data++) = (unsigned char)(((*xq << sample_shift) >> 8) + 128);

with

*(data++) = (unsigned char)((((*xi << sample_shift) + 0x80) >> 8) + 128);
*(data++) = (unsigned char)((((*xq << sample_shift) + 0x80) >> 8) + 128);

or even more optimized

*(data++) = (unsigned char)(((*xi << sample_shift) + 0x8080) >> 8);
*(data++) = (unsigned char)(((*xq << sample_shift) + 0x8080) >> 8);

Cheers

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