diff --git a/src-core/dsp/utils/delay_one_imag.cpp b/src-core/dsp/utils/delay_one_imag.cpp
new file mode 100644
index 000000000..a01dda960
--- /dev/null
+++ b/src-core/dsp/utils/delay_one_imag.cpp
@@ -0,0 +1,45 @@
+#include "delay_one_imag.h"
+
+namespace satdump
+{
+    namespace ndsp
+    {
+        DelayOneImagBlock::DelayOneImagBlock() : Block("delay_one_imag_cc", {{"in", DSP_SAMPLE_TYPE_CF32}}, {{"out", DSP_SAMPLE_TYPE_CF32}}) {}
+
+        DelayOneImagBlock::~DelayOneImagBlock() {}
+
+        bool DelayOneImagBlock::work()
+        {
+            DSPBuffer iblk;
+            inputs[0].fifo->wait_dequeue(iblk);
+
+            if (iblk.isTerminator())
+            {
+                if (iblk.terminatorShouldPropagate())
+                    outputs[0].fifo->wait_enqueue(DSPBuffer::newBufferTerminator());
+                iblk.free();
+                return true;
+            }
+
+            auto oblk = DSPBuffer::newBufferSamples<complex_t>(iblk.max_size);
+            complex_t *ibuf = iblk.getSamples<complex_t>();
+            complex_t *obuf = iblk.getSamples<complex_t>();
+
+            for (uint32_t i = 0; i < iblk.size; i++)
+            {
+                float imag = i == 0 ? lastSamp : ibuf[i - 1].imag;
+                float real = ibuf[i].real;
+                obuf[i] = complex_t(real, imag);
+            }
+
+            lastSamp = ibuf[iblk.size - 1].imag;
+
+            oblk.size = iblk.size;
+            outputs[0].fifo->wait_enqueue(oblk);
+            iblk.free();
+            return false;
+        }
+
+    }; // namespace ndsp
+
+} // namespace satdump
diff --git a/src-core/dsp/utils/delay_one_imag.h b/src-core/dsp/utils/delay_one_imag.h
new file mode 100644
index 000000000..103869850
--- /dev/null
+++ b/src-core/dsp/utils/delay_one_imag.h
@@ -0,0 +1,40 @@
+#pragma once
+
+#include "common/dsp/complex.h"
+#include "dsp/block.h"
+
+namespace satdump
+{
+    namespace ndsp
+    {
+        class DelayOneImagBlock : public Block
+        {
+        private:
+        //
+
+        private:
+            float lastSamp;
+            // complex_t tmp_val;
+
+            bool work();
+
+        public:
+            DelayOneImagBlock();
+            ~DelayOneImagBlock();
+
+            void init() {}
+
+            nlohmann::json get_cfg(std::string key)
+            {
+                throw satdump_exception(key);
+            }
+
+            cfg_res_t set_cfg(std::string key, nlohmann::json v)
+            {
+                throw satdump_exception(key);
+                return RES_OK;
+            }
+        };
+
+    } // namespace ndsp
+} // namespace satdump