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Modified time constant of DC removal high-pass filter to avoid a too high cut-off frequency when run with at fast sample rates

pull/68/head
Silvano Seva 2022-05-09 21:29:52 +02:00
rodzic 6b31a73f42
commit b998d3b78f
1 zmienionych plików z 3 dodań i 3 usunięć
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openrtx/src/core/dsp.cpp
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@ -74,9 +74,9 @@ void dsp_dcRemoval(filter_state_t *state, audio_sample_t *buffer, size_t length)
{ {
/* /*
* Removal of DC component performed using an high-pass filter with * Removal of DC component performed using an high-pass filter with
* transfer function G(z) = (z - 1)/(z - 0.99). * transfer function G(z) = (z - 1)/(z - 0.999).
* Recursive implementation of the filter is: * Recursive implementation of the filter is:
* y(k) = u(k) - u(k-1) + 0.99*y(k-1) * y(k) = u(k) - u(k-1) + 0.999*y(k-1)
*/ */
if(length < 2) return; if(length < 2) return;
@ -87,7 +87,7 @@ void dsp_dcRemoval(filter_state_t *state, audio_sample_t *buffer, size_t length)
state->initialised = true; state->initialised = true;
} }
static constexpr float alpha = 0.99f; static constexpr float alpha = 0.999f;
for(size_t i = 1; i < length; i++) for(size_t i = 1; i < length; i++)
{ {