diff --git a/dsp/mrate/fir_decim.cpp b/dsp/mrate/fir_decim.cpp
new file mode 100644
index 0000000..f1f354e
--- /dev/null
+++ b/dsp/mrate/fir_decim.cpp
@@ -0,0 +1,107 @@
+#include "fir_decim.h"
+#include "../complex.h"
+#include <string.h>
+#include <volk/volk.h>
+
+namespace dsp::mrate {
+    template <class SAMPLE, class TAP>
+    FIRDecim<SAMPLE, TAP>::FIRDecim() {}
+
+    template <class SAMPLE, class TAP>
+    FIRDecim<SAMPLE, TAP>::FIRDecim(const Taps<TAP>& taps, int decim) {
+        // Save the parameters
+        this->taps = taps;
+        this->decim = decim;
+
+        // Pre-allocate the history buffer
+        hist.reserve(taps.size());
+
+        // Initialize the state
+        reset();
+    }
+
+    template <class SAMPLE, class TAP>
+    FIRDecim<SAMPLE, TAP>::FIRDecim(Taps<TAP>&& taps, int decim) {
+        // Save the parameters
+        this->taps = taps;
+        this->decim = decim;
+
+        // Pre-allocate the history buffer
+        hist.reserve(taps.size());
+
+        // Initialize the state
+        reset();
+    }
+
+    template <class SAMPLE, class TAP>
+    const Taps<TAP>& FIRDecim<SAMPLE, TAP>::getTaps() const {
+        // Return the taps
+        return taps;
+    }
+
+    template <class SAMPLE, class TAP>
+    void FIRDecim<SAMPLE, TAP>::setTaps(const Taps<TAP>& taps, int decim) {
+        // Update the taps
+        this->taps = taps;
+
+        // Update the decimation factor if it was given
+        if (decim) { this->decim = decim; }
+    }
+
+    template <class SAMPLE, class TAP>
+    void FIRDecim<SAMPLE, TAP>::setTaps(Taps<TAP>&& taps, int decim) {
+        // Update the taps
+        this->taps = taps;
+        
+        // Update the decimation factor if it was given
+        if (decim) { this->decim = decim; }
+    }
+
+    template <class SAMPLE, class TAP>
+    void FIRDecim<SAMPLE, TAP>::reset() {
+        // Zero out the history buffer
+        memset(hist.data(), 0, (taps.size() - 1) * sizeof(SAMPLE));
+
+        // Reset the offset
+        offset = 0;
+    }
+
+    template <class SAMPLE, class TAP>
+    size_t FIRDecim<SAMPLE, TAP>::process(const SAMPLE* in, SAMPLE* out, size_t count) {
+        // Reserve enough space in the history buffer
+        hist.reserve(taps.size() + count - 1, REALLOC_KEEP);
+
+        // Copy over the new input samples
+        memcpy(&hist[taps.size() - 1], in, count * sizeof(SAMPLE));
+
+        // Filter the samples
+        uintptr_t i;
+        uintptr_t io = 0;
+        for (i = offset; i < count; i += decim) {
+            // Compute the dot product depending on type
+            if constexpr (std::is_same_v<SAMPLE, float>) {
+                volk_32f_x2_dot_prod_32f(&out[io++], &hist[i], taps.data(), taps.size());
+            }
+            else if constexpr (std::is_same_v<SAMPLE, Complex> && std::is_same_v<TAP, float>) {
+                volk_32fc_32f_dot_prod_32fc((lv_32fc_t*)&out[io++], (const lv_32fc_t*)&hist[i], taps.data(), taps.size());
+            }
+            else if constexpr (std::is_same_v<SAMPLE, Complex> && std::is_same_v<TAP, Complex>) {
+                volk_32fc_x2_dot_prod_32fc((lv_32fc_t*)&out[io++], (const lv_32fc_t*)&hist[i], (const lv_32fc_t*)taps.data(), taps.size());
+            }
+        }
+
+        // Update the offset
+        offset = i - count;
+
+        // Move over the unused sample to the history buffer
+        memmove(hist.data(), &hist[count], (taps.size() - 1) * sizeof(SAMPLE));
+
+        // Return the number of samples generated
+        return io;
+    }
+
+    // Instantiate the class
+    template class FIRDecim<float, float>;
+    template class FIRDecim<Complex, float>;
+    template class FIRDecim<Complex, Complex>;
+}
\ No newline at end of file
diff --git a/dsp/mrate/fir_decim.h b/dsp/mrate/fir_decim.h
new file mode 100644
index 0000000..f554321
--- /dev/null
+++ b/dsp/mrate/fir_decim.h
@@ -0,0 +1,79 @@
+#pragma once
+#include "../processor.h"
+#include "../buffer.h"
+#include "../taps.h"
+
+namespace dsp::mrate {
+    template <class SAMPLE, class TAP>
+    class FIRDecim {
+    public:
+        // Default constructor
+        FIRDecim();
+
+        /**
+         * Create a decimating FIR filter.
+         * @param taps Taps to use for the filter.
+         * @param decim Decimation factor.
+        */
+        FIRDecim(const Taps<TAP>& taps, int decim);
+
+        /**
+         * Create a decimating FIR filter.
+         * @param taps Taps to use for the filter.
+         * @param decim Decimation factor.
+        */
+        FIRDecim(Taps<TAP>&& taps, int decim);
+
+        /**
+         * Get the filter taps.
+         * @return Filter taps.
+        */
+        const Taps<TAP>& getTaps() const;
+
+        /**
+         * Set the filter taps.
+         * @param taps Filter taps.
+         * @param decim Decimation factor. Zero to keep unchanged.
+        */
+        void setTaps(const Taps<TAP>& taps, int decim = 0);
+
+        /**
+         * Set the filter taps.
+         * @param taps Filter taps.
+         * @param decim Decimation factor. Zero to keep unchanged.
+        */
+        void setTaps(Taps<TAP>&& taps, int decim = 0);
+
+        /**
+         * Get the decimation factor.
+         * @return Decimation factor.
+        */
+        int getDecimation();
+
+        /**
+         * Set the decimation factor.
+         * @param decim Decimation factor.
+        */
+        void setDecimation(int decim);
+
+        /**
+         * Reset the state of the filter.
+        */
+        void reset();
+
+        /**
+         * Filter and decimate samples.
+         * @param in Input samples.
+         * @param out Output samples.
+         * @param count Number of samples to filter.
+         * @return Number of samples generates.
+        */
+        size_t process(const SAMPLE* in, SAMPLE* out, size_t count);
+
+    private:
+        Buffer<SAMPLE> hist;
+        uintptr_t offset = 0;
+        Taps<TAP> taps;
+        int decim = 0;
+    };
+}
\ No newline at end of file
diff --git a/dsp/mrate/fir_interp.cpp b/dsp/mrate/fir_interp.cpp
new file mode 100644
index 0000000..d65e6ce
--- /dev/null
+++ b/dsp/mrate/fir_interp.cpp
@@ -0,0 +1,98 @@
+#include "fir_interp.h"
+#include "../complex.h"
+#include <string.h>
+#include <volk/volk.h>
+
+namespace dsp::mrate {
+    template <class SAMPLE, class TAP>
+    FIRInterp<SAMPLE, TAP>::FIRInterp() {}
+
+    template <class SAMPLE, class TAP>
+    FIRInterp<SAMPLE, TAP>::FIRInterp(const Taps<TAP>& taps, int interp) {
+        // Save the parameters
+        this->taps = taps;
+        this->interp = interp;
+
+        // Pre-allocate the history buffer
+        hist.reserve(taps.size());
+
+        // Initialize the state
+        reset();
+
+        // Generate the tap phases
+        generatePhases();
+    }
+
+    template <class SAMPLE, class TAP>
+    FIRInterp<SAMPLE, TAP>::FIRInterp(Taps<TAP>&& taps, int interp) {
+        // Save the parameters
+        this->taps = taps;
+        this->interp = interp;
+
+        // Pre-allocate the history buffer
+        hist.reserve(taps.size());
+
+        // Initialize the state
+        reset();
+
+        // Generate the tap phases
+        generatePhases();
+    }
+
+    template <class SAMPLE, class TAP>
+    const Taps<TAP>& FIRInterp<SAMPLE, TAP>::getTaps() const {
+        // Return the taps
+        return taps;
+    }
+
+    template <class SAMPLE, class TAP>
+    void FIRInterp<SAMPLE, TAP>::setTaps(const Taps<TAP>& taps, int interp) {
+        // Update the taps
+        this->taps = taps;
+
+        // Update the interpolation factor if it was given
+        if (interp) { this->interp = interp; }
+
+        // Regenerate the tap phases
+        generatePhases();
+    }
+
+    template <class SAMPLE, class TAP>
+    void FIRInterp<SAMPLE, TAP>::setTaps(Taps<TAP>&& taps, int interp) {
+        // Update the taps
+        this->taps = taps;
+        
+        // Update the interpolation factor if it was given
+        if (interp) { this->interp = interp; }
+
+        // Regenerate the tap phases
+        generatePhases();
+    }
+
+    template <class SAMPLE, class TAP>
+    void FIRInterp<SAMPLE, TAP>::reset() {
+        // Zero out the history buffer
+        memset(hist.data(), 0, (taps.size() - 1) * sizeof(SAMPLE));
+
+        // Reset the offset
+        offset = 0;
+    }
+
+    template <class SAMPLE, class TAP>
+    size_t FIRInterp<SAMPLE, TAP>::process(const SAMPLE* in, SAMPLE* out, size_t count) {
+        // TODO
+
+        // Return the number of samples generated
+        return 0;
+    }
+
+    template <class SAMPLE, class TAP>
+    void FIRInterp<SAMPLE, TAP>::generatePhases() {
+        // TODO
+    }
+
+    // Instantiate the class
+    template class FIRInterp<float, float>;
+    template class FIRInterp<Complex, float>;
+    template class FIRInterp<Complex, Complex>;
+}
\ No newline at end of file
diff --git a/dsp/mrate/fir_interp.h b/dsp/mrate/fir_interp.h
new file mode 100644
index 0000000..4dff76c
--- /dev/null
+++ b/dsp/mrate/fir_interp.h
@@ -0,0 +1,83 @@
+#pragma once
+#include "../processor.h"
+#include "../buffer.h"
+#include "../taps.h"
+#include <vector>
+
+namespace dsp::mrate {
+    template <class SAMPLE, class TAP>
+    class FIRInterp {
+    public:
+        // Default constructor
+        FIRInterp();
+
+        /**
+         * Create a decimating FIR filter.
+         * @param taps Taps to use for the filter.
+         * @param interp Interpolation factor.
+        */
+        FIRInterp(const Taps<TAP>& taps, int interp);
+
+        /**
+         * Create a decimating FIR filter.
+         * @param taps Taps to use for the filter.
+         * @param interp Interpolation factor.
+        */
+        FIRInterp(Taps<TAP>&& taps, int interp);
+
+        /**
+         * Get the filter taps.
+         * @return Filter taps.
+        */
+        const Taps<TAP>& getTaps() const;
+
+        /**
+         * Set the filter taps.
+         * @param taps Filter taps.
+         * @param interp Interpolation factor. Zero to keep unchanged.
+        */
+        void setTaps(const Taps<TAP>& taps, int interp = 0);
+
+        /**
+         * Set the filter taps.
+         * @param taps Filter taps.
+         * @param interp Interpolation factor. Zero to keep unchanged.
+        */
+        void setTaps(Taps<TAP>&& taps, int interp = 0);
+
+        /**
+         * Get the interpolation factor.
+         * @return Interpolation factor.
+        */
+        int getInterpolation();
+
+        /**
+         * Set the interpolation factor.
+         * @param interp Interpolation factor.
+        */
+        void setInterpolation(int interp);
+
+        /**
+         * Reset the state of the filter.
+        */
+        void reset();
+
+        /**
+         * Filter and decimate samples.
+         * @param in Input samples.
+         * @param out Output samples.
+         * @param count Number of samples to filter.
+         * @return Number of samples generates.
+        */
+        size_t process(const SAMPLE* in, SAMPLE* out, size_t count);
+
+    private:
+        void generatePhases();
+
+        Buffer<SAMPLE> hist;
+        uintptr_t offset = 0;
+        Taps<TAP> taps;
+        std::vector<Buffer<TAP>> phases;
+        int interp = 0;
+    };
+}
\ No newline at end of file