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diff --git a/gnuradio-runtime/include/gnuradio/nco.h b/gnuradio-runtime/include/gnuradio/nco.h
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+++ b/gnuradio-runtime/include/gnuradio/nco.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2002,2013 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_NCO_H_
+#define _GR_NCO_H_
+
+#include <gnuradio/sincos.h>
+#include <gnuradio/gr_complex.h>
+#include <vector>
+#include <cmath>
+
+namespace gr {
+
+  /*!
+   * \brief base class template for Numerically Controlled Oscillator (NCO)
+   * \ingroup misc
+   */
+  template<class o_type, class i_type>
+  class nco
+  {
+  public:
+    nco() : phase(0), phase_inc(0) {}
+
+    virtual ~nco() {}
+
+    // radians
+    void set_phase(double angle)
+    {
+      phase = angle;
+    }
+
+    void adjust_phase(double delta_phase)
+    {
+      phase += delta_phase;
+    }
+
+    // angle_rate is in radians / step
+    void set_freq(double angle_rate)
+    {
+      phase_inc = angle_rate;
+    }
+
+    // angle_rate is a delta in radians / step
+    void adjust_freq(double delta_angle_rate)
+    {
+      phase_inc += delta_angle_rate;
+    }
+
+    // increment current phase angle
+    void step()
+    {
+      phase += phase_inc;
+      if(fabs(phase) > M_PI) {
+        while(phase > M_PI)
+          phase -= 2*M_PI;
+
+        while(phase < -M_PI)
+          phase += 2*M_PI;
+      }
+    }
+
+    void step(int n)
+    {
+      phase += phase_inc * n;
+      if(fabs(phase) > M_PI){
+        while(phase > M_PI)
+          phase -= 2*M_PI;
+
+        while(phase < -M_PI)
+          phase += 2*M_PI;
+      }
+    }
+
+    // units are radians / step
+    double get_phase() const { return phase; }
+    double get_freq() const { return phase_inc; }
+
+    // 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(phase); }
+    float sin() const { return std::sin(phase); }
+
+    // compute a block at a time
+    void sin(float *output, int noutput_items, double ampl = 1.0);
+    void cos(float *output, int noutput_items, double ampl = 1.0);
+    void sincos(gr_complex *output, int noutput_items, double ampl = 1.0);
+    void sin(short *output, int noutput_items, double ampl = 1.0);
+    void cos(short *output, int noutput_items, double ampl = 1.0);
+    void sin(int *output, int noutput_items, double ampl = 1.0);
+    void cos(int *output, int noutput_items, double ampl = 1.0);
+
+  protected:
+    double phase;
+    double phase_inc;
+  };
+
+  template<class o_type, class i_type>
+  void
+  nco<o_type,i_type>::sincos(float *sinx, float *cosx) const
+  {
+    gr::sincosf(phase, sinx, cosx);
+  }
+
+  template<class o_type, class i_type>
+  void
+  nco<o_type,i_type>::sin(float *output, int noutput_items, double ampl)
+  {
+    for(int i = 0; i < noutput_items; i++) {
+      output[i] = (float)(sin () * ampl);
+      step();
+    }
+  }
+
+  template<class o_type, class i_type>
+  void
+  nco<o_type,i_type>::cos(float *output, int noutput_items, double ampl)
+  {
+    for(int i = 0; i < noutput_items; i++) {
+      output[i] = (float)(cos() * ampl);
+      step();
+    }
+  }
+
+  template<class o_type, class i_type>
+  void
+  nco<o_type,i_type>::sin(short *output, int noutput_items, double ampl)
+  {
+    for(int i = 0; i < noutput_items; i++) {
+      output[i] = (short)(sin() * ampl);
+      step();
+    }
+  }
+
+  template<class o_type, class i_type>
+  void
+  nco<o_type,i_type>::cos(short *output, int noutput_items, double ampl)
+  {
+    for(int i = 0; i < noutput_items; i++) {
+      output[i] = (short)(cos() * ampl);
+      step();
+    }
+  }
+
+  template<class o_type, class i_type>
+  void
+  nco<o_type,i_type>::sin(int *output, int noutput_items, double ampl)
+  {
+    for(int i = 0; i < noutput_items; i++) {
+      output[i] = (int)(sin() * ampl);
+      step();
+    }
+  }
+
+  template<class o_type, class i_type>
+  void
+  nco<o_type,i_type>::cos(int *output, int noutput_items, double ampl)
+  {
+    for(int i = 0; i < noutput_items; i++) {
+      output[i] = (int)(cos() * ampl);
+      step();
+    }
+  }
+
+  template<class o_type, class i_type>
+  void
+  nco<o_type,i_type>::sincos(gr_complex *output, int noutput_items, double ampl)
+  {
+    for(int i = 0; i < noutput_items; i++) {
+      float cosx, sinx;
+      nco::sincos(&sinx, &cosx);
+      output[i] = gr_complex(cosx * ampl, sinx * ampl);
+      step();
+    }
+  }
+
+} /* namespace gr */
+
+#endif /* _NCO_H_ */