diff --git a/src/fm_demod.rs b/src/fm_demod.rs
new file mode 100644
index 0000000..c2f5f9f
--- /dev/null
+++ b/src/fm_demod.rs
@@ -0,0 +1,39 @@
+use std::{os::unix::process, slice::Chunks};
+
+use crate::iq_reader::{IqChunk, IqSample};
+
+pub struct FmDemod<I> {
+    pub inner: I,
+    pub prev_sample: IqSample,
+}
+
+impl<I> FmDemod<I> {
+    pub fn new(inner: I) -> Self {
+        Self {
+            inner,
+            prev_sample: IqSample::new(1.0, 0.0),
+        }
+    }
+
+    pub fn process_chunk(&mut self, chunk: &mut IqChunk) {
+        // TODO: FM Demodulation
+        todo!();
+    }
+}
+
+impl<I, E> Iterator for FmDemod<I>
+where
+    I: Iterator<Item = Result<IqChunk, E>>,
+{
+    type Item = Result<IqChunk, E>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        match self.inner.next()? {
+            Ok(mut chunk) => {
+                self.process_chunk(&mut chunk);
+                Some(Ok(chunk))
+            }
+            Err(e) => Some(Err(e)),
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 48b77ca..fdc9380 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,6 +4,7 @@ use std::error::Error;
 
 mod agc;
 mod fir;
+mod fm_demod;
 mod iq_reader;
 mod pipeline;
 mod utils;