VE7UWU/sdrangel
1
0
Fork 0
mirror of https://github.com/f4exb/sdrangel.git synced 2025-08-03 14:32:25 -04:00
Code Issues Projects Releases Wiki Activity

Merge pull request #811 from srcejon/fir_fix

Browse Source 
Fix impulse response of FIR filter
This commit is contained in:
Edouard Griffiths 2021-03-19 12:27:03 +01:00 committed by GitHub
commit ae31b2ddcf
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
sdrbase/dsp/firfilter.h
View File

@ -38,7 +38,7 @@ public:
unsigned int n_samples = m_samples.size(); unsigned int n_samples = m_samples.size();
unsigned int n_taps = m_taps.size() - 1; unsigned int n_taps = m_taps.size() - 1;
unsigned int a = m_ptr; 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; m_samples[m_ptr] = sample;
@ -46,8 +46,8 @@ public:
{ {
acc += (m_samples[a] + m_samples[b]) * m_taps[i]; acc += (m_samples[a] + m_samples[b]) * m_taps[i];
a = (a == n_samples - 1) ? 0 : a + 1; a = (a == 0) ? n_samples - 1 : a - 1;
b = (b == 0) ? n_samples - 1 : b - 1; b = (b == n_samples - 1) ? 0 : b + 1;
} }
acc += m_samples[a] * m_taps[n_taps]; acc += m_samples[a] * m_taps[n_taps];