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diff --git a/gnuradio-runtime/include/gr_fxpt_vco.h b/gnuradio-runtime/include/gr_fxpt_vco.h
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+++ b/gnuradio-runtime/include/gr_fxpt_vco.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2002,2004,2005 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+#ifndef INCLUDED_GR_FXPT_VCO_H
+#define INCLUDED_GR_FXPT_VCO_H
+
+#include <gr_runtime_api.h>
+#include <gr_fxpt.h>
+#include <gr_complex.h>
+
+/*!
+ * \brief Voltage Controlled Oscillator (VCO)
+ * \ingroup misc
+ */
+class /*GR_RUNTIME_API*/ gr_fxpt_vco {
+  gr_int32	d_phase;
+
+public:
+  gr_fxpt_vco () : d_phase (0) {}
+
+  ~gr_fxpt_vco () {}
+
+  // radians
+  void set_phase (float angle) {
+    d_phase = gr_fxpt::float_to_fixed (angle);
+  }
+
+  void adjust_phase (float delta_phase) {
+    d_phase += gr_fxpt::float_to_fixed (delta_phase);
+  }
+
+  float get_phase () const { return gr_fxpt::fixed_to_float (d_phase); }
+
+  // compute sin and cos for current phase angle
+  void sincos (float *sinx, float *cosx) const
+  {
+    *sinx = gr_fxpt::sin (d_phase);
+    *cosx = gr_fxpt::cos (d_phase);
+  }
+
+  // compute a block at a time
+  void cos (float *output, const float *input, int noutput_items, float k, float ampl = 1.0)
+  {
+    for (int i = 0; i < noutput_items; i++){
+      output[i] = (float)(gr_fxpt::cos (d_phase) * ampl);
+      adjust_phase(input[i] * k);
+    }
+  }
+
+  // compute cos or sin for current phase angle
+  float cos () const { return gr_fxpt::cos (d_phase); }
+  float sin () const { return gr_fxpt::sin (d_phase); }
+};
+
+#endif /* INCLUDED_GR_FXPT_VCO_H */