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let's try the reversed poly 1101101

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This commit is contained in:
Ahmet Inan 2025-12-23 18:03:13 +01:00
commit 174f569cd9
2 changed files with 16 additions and 10 deletions
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13
pac_encoder.hh
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@ -21,18 +21,21 @@ class PACEncoder
static bool conv(int *state, bool input)
{
#if 0
// 1011011
bool b1 = (*state >> 1) & 1;
bool b3 = (*state >> 3) & 1;
bool b4 = (*state >> 4) & 1;
bool b6 = (*state >> 6) & 1;
bool output = input ^ b1 ^ b3 ^ b4 ^ b6;
*state = ((*state & 126) << 1) | (input ? 2 : 0) | (output ? 1 : 0);
#else
bool s1 = *state & 1;
bool s2 = *state & 2;
bool output = input ^ s1 ^ s2;
*state = (s1 << 1) | output;
// 1101101
bool b2 = (*state >> 2) & 1;
bool b3 = (*state >> 3) & 1;
bool b5 = (*state >> 5) & 1;
bool b6 = (*state >> 6) & 1;
bool output = input ^ b2 ^ b3 ^ b5 ^ b6;
#endif
*state = ((*state & 126) << 1) | (input ? 2 : 0) | (output ? 1 : 0);
return output;
}
public: