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diff --git a/gnuradio-runtime/lib/math/vco.h b/gnuradio-runtime/lib/math/vco.h
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+++ b/gnuradio-runtime/lib/math/vco.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2005,2013 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 _GR_VCO_H_
+#define _GR_VCO_H_
+
+#include <gnuradio/sincos.h>
+#include <gnuradio/gr_complex.h>
+#include <vector>
+#include <cmath>
+
+namespace gr {
+
+  /*!
+   * \brief base class template for Voltage Controlled Oscillator (VCO)
+   * \ingroup misc
+   */
+  template<class o_type, class i_type>
+  class vco
+  {
+  public:
+    vco() : d_phase(0) {}
+
+    virtual ~vco() {}
+
+    // radians
+    void set_phase(double angle) {
+      d_phase = angle;
+    }
+
+    void adjust_phase(double delta_phase) {
+      d_phase += delta_phase;
+      if(fabs (d_phase) > M_PI){
+
+        while(d_phase > M_PI)
+          d_phase -= 2*M_PI;
+
+        while(d_phase < -M_PI)
+          d_phase += 2*M_PI;
+      }
+    }
+
+    double get_phase() const { return d_phase; }
+
+    // compute sin and cos for current phase angle
+    void sincos(float *sinx, float *cosx) const;
+
+    // compute cos or sin for current phase angle
+    float cos() const { return std::cos(d_phase); }
+    float sin() const { return std::sin(d_phase); }
+
+    // compute a block at a time
+    void cos(float *output, const float *input,
+             int noutput_items, double k, double ampl = 1.0);
+
+  protected:
+    double d_phase;
+  };
+
+  template<class o_type, class i_type>
+  void
+  vco<o_type,i_type>::sincos(float *sinx, float *cosx) const
+  {
+    gr::sincosf(d_phase, sinx, cosx);
+  }
+
+  template<class o_type, class i_type>
+  void
+  vco<o_type,i_type>::cos(float *output, const float *input,
+                          int noutput_items, double k, double ampl)
+  {
+    for(int i = 0; i < noutput_items; i++) {
+      output[i] = cos() * ampl;
+      adjust_phase(input[i] * k);
+    }
+  }
+
+} /* namespace gr */
+
+#endif /* _GR_VCO_H_ */