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Compromise on 8 bit decimator pre process shift constants so that it pads to 15 bits instead of 16. Prevents saturation in all cases.

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f4exb 2018-01-14 05:12:24 +01:00
parent e3575d5f5f
commit 45e04f06ae
1 changed files with 7 additions and 7 deletions
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14
sdrbase/dsp/decimators.h
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@ -83,18 +83,18 @@ struct decimation_shifts<16, 12>
template<> template<>
struct decimation_shifts<16, 8> struct decimation_shifts<16, 8>
{ {
static const uint pre1 = 8; static const uint pre1 = 7;
static const uint pre2 = 7; static const uint pre2 = 6;
static const uint post2 = 0; static const uint post2 = 0;
static const uint pre4 = 6; static const uint pre4 = 5;
static const uint post4 = 0; static const uint post4 = 0;
static const uint pre8 = 5; static const uint pre8 = 4;
static const uint post8 = 0; static const uint post8 = 0;
static const uint pre16 = 4; static const uint pre16 = 3;
static const uint post16 = 0; static const uint post16 = 0;
static const uint pre32 = 3; static const uint pre32 = 2;
static const uint post32 = 0; static const uint post32 = 0;
static const uint pre64 = 2; static const uint pre64 = 1;
static const uint post64 = 0; static const uint post64 = 0;
}; };