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Fix impulse response of FIR filter

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This commit is contained in:
Jon Beniston 2021-03-19 08:54:12 +00:00
parent cae265a728
commit 5aab615aef
1 changed files with 3 additions and 3 deletions
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6
sdrbase/dsp/firfilter.h
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@ -38,7 +38,7 @@ public:
unsigned int n_samples = m_samples.size();
unsigned int n_taps = m_taps.size() - 1;
unsigned int a = m_ptr;
unsigned int b = a == 0 ? n_samples - 1 : a - 1;
unsigned int b = a == n_samples - 1 ? 0 : a + 1;
m_samples[m_ptr] = sample;
@ -46,8 +46,8 @@ public:
{
acc += (m_samples[a] + m_samples[b]) * m_taps[i];
a = (a == n_samples - 1) ? 0 : a + 1;
b = (b == 0) ? n_samples - 1 : b - 1;
a = (a == 0) ? n_samples - 1 : a - 1;
b = (b == n_samples - 1) ? 0 : b + 1;
}
acc += m_samples[a] * m_taps[n_taps];