From e440fc873593821254b6b2741a5daec6bccdef47 Mon Sep 17 00:00:00 2001
From: Jon Nordby <jononor@gmail.com>
Date: Fri, 8 Aug 2025 21:26:58 +0200
Subject: pdm: Try add high pass filter for DC blocking/removal

Does not work right...
---
 bindings/sim_cic3_pdm.cc | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'bindings/sim_cic3_pdm.cc')

diff --git a/bindings/sim_cic3_pdm.cc b/bindings/sim_cic3_pdm.cc
index 0368217..cb612f8 100644
--- a/bindings/sim_cic3_pdm.cc
+++ b/bindings/sim_cic3_pdm.cc
@@ -15,6 +15,8 @@ pdm2pcm_cic3(const uint8_t *pdm, int pdm_length, int16_t *pcm, int pcm_length)
 
 	Vcic3_pdm *top = new Vcic3_pdm{cp};
 
+    top->hpf_alpha = 240;
+
 	// Start clock off
 	top->clk = 0;
 
-- 
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