--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/src/spandsp/dds.h	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,259 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * dds.h
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2003 Steve Underwood
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1,
+ * as published by the Free Software Foundation.
+ *
+ * This program 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id: dds.h,v 1.23 2009/01/31 08:48:11 steveu Exp $
+ */
+
+/*! \file */
+
+#if !defined(_SPANDSP_DDS_H_)
+#define _SPANDSP_DDS_H_
+
+#if defined(__cplusplus)
+extern "C"
+{
+#endif
+
+/*! \brief Find the phase rate value to achieve a particular frequency.
+    \param frequency The desired frequency, in Hz.
+    \return The phase rate which while achieve the desired frequency.
+*/
+SPAN_DECLARE(int32_t) dds_phase_rate(float frequency);
+
+/*! \brief Find the frequency, in Hz, equivalent to a phase rate.
+    \param phase_rate The phase rate.
+    \return The equivalent frequency, in Hz.
+*/
+SPAN_DECLARE(float) dds_frequency(int32_t phase_rate);
+
+/*! \brief Find the scaling factor needed to achieve a specified level in dBm0.
+    \param level The desired signal level, in dBm0.
+    \return The scaling factor.
+*/
+SPAN_DECLARE(int16_t) dds_scaling_dbm0(float level);
+
+/*! \brief Find the scaling factor needed to achieve a specified level in dBmov.
+    \param level The desired signal level, in dBmov.
+    \return The scaling factor.
+*/
+SPAN_DECLARE(int16_t) dds_scaling_dbov(float level);
+
+/*! \brief Find the amplitude for a particular phase.
+    \param phase The desired phase 32 bit phase.
+    \return The signal amplitude.
+*/
+SPAN_DECLARE(int16_t) dds_lookup(uint32_t phase);
+
+/*! \brief Find the amplitude for a particular phase offset from an accumulated phase.
+    \param phase_acc The accumulated phase.
+    \param phase_offset The phase offset.
+    \return The signal amplitude.
+*/
+SPAN_DECLARE(int16_t) dds_offset(uint32_t phase_acc, int32_t phase_offset);
+
+/*! \brief Advance the phase, without returning any new signal sample.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+*/
+SPAN_DECLARE(void) dds_advance(uint32_t *phase_acc, int32_t phase_rate);
+
+/*! \brief Generate an integer tone sample.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+    \return The signal amplitude, between -32767 and 32767.
+*/
+SPAN_DECLARE(int16_t) dds(uint32_t *phase_acc, int32_t phase_rate);
+
+/*! \brief Lookup the integer value of a specified phase.
+    \param phase The phase accumulator value to be looked up.
+    \return The signal amplitude, between -32767 and 32767.
+*/
+SPAN_DECLARE(int16_t) dds_lookup(uint32_t phase);
+
+/*! \brief Generate an integer tone sample, with modulation.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+    \param scale The scaling factor.
+    \param phase The phase offset.
+    \return The signal amplitude, between -32767 and 32767.
+*/
+SPAN_DECLARE(int16_t) dds_mod(uint32_t *phase_acc, int32_t phase_rate, int16_t scale, int32_t phase);
+
+/*! \brief Lookup the complex integer value of a specified phase.
+    \param phase The phase accumulator value to be looked up.
+    \return The complex signal amplitude, between (-32767, -32767) and (32767, 32767).
+*/
+SPAN_DECLARE(complexi_t) dds_lookup_complexi(uint32_t phase);
+
+/*! \brief Generate a complex integer tone sample.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+    \return The complex signal amplitude, between (-32767, -32767) and (32767, 32767).
+*/
+SPAN_DECLARE(complexi_t) dds_complexi(uint32_t *phase_acc, int32_t phase_rate);
+
+/*! \brief Generate a complex integer tone sample, with modulation.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+    \param scale The scaling factor.
+    \param phase The phase offset.
+    \return The complex signal amplitude, between (-32767, -32767) and (32767, 32767).
+*/
+SPAN_DECLARE(complexi_t) dds_complexi_mod(uint32_t *phase_acc, int32_t phase_rate, int16_t scale, int32_t phase);
+
+/*! \brief Generate a complex 16 bit integer tone sample.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+    \return The complex signal amplitude, between (-32767, -32767) and (32767, 32767).
+*/
+SPAN_DECLARE(complexi16_t) dds_lookup_complexi16(uint32_t phase);
+
+/*! \brief Generate a complex 16 bit integer tone sample.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+    \return The complex signal amplitude, between (-32767, -32767) and (32767, 32767).
+*/
+SPAN_DECLARE(complexi16_t) dds_complexi16(uint32_t *phase_acc, int32_t phase_rate);
+
+/*! \brief Generate a complex 16bit integer tone sample, with modulation.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+    \param scale The scaling factor.
+    \param phase The phase offset.
+    \return The complex signal amplitude, between (-32767, -32767) and (32767, 32767).
+*/
+SPAN_DECLARE(complexi16_t) dds_complexi16_mod(uint32_t *phase_acc, int32_t phase_rate, int16_t scale, int32_t phase);
+
+/*! \brief Generate a complex 32 bit integer tone sample, with modulation.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+    \param scale The scaling factor.
+    \param phase The phase offset.
+    \return The complex signal amplitude, between (-32767, -32767) and (32767, 32767).
+*/
+SPAN_DECLARE(complexi32_t) dds_complexi32_mod(uint32_t *phase_acc, int32_t phase_rate, int16_t scale, int32_t phase);
+
+/*! \brief Generate a complex 32 bit integer tone sample.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+    \return The complex signal amplitude, between (-32767, -32767) and (32767, 32767).
+*/
+SPAN_DECLARE(complexi32_t) dds_lookup_complexi32(uint32_t phase);
+
+/*! \brief Generate a complex 32 bit integer tone sample.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+    \return The complex signal amplitude, between (-32767, -32767) and (32767, 32767).
+*/
+SPAN_DECLARE(complexi32_t) dds_complexi32(uint32_t *phase_acc, int32_t phase_rate);
+
+/*! \brief Generate a complex 32 bit integer tone sample, with modulation.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+    \param scale The scaling factor.
+    \param phase The phase offset.
+    \return The complex signal amplitude, between (-32767, -32767) and (32767, 32767).
+*/
+SPAN_DECLARE(complexi32_t) dds_complexi32_mod(uint32_t *phase_acc, int32_t phase_rate, int16_t scale, int32_t phase);
+
+/*! \brief Find the phase rate equivalent to a frequency, in Hz.
+    \param frequency The frequency, in Hz.
+    \return The equivalent phase rate.
+*/
+SPAN_DECLARE(int32_t) dds_phase_ratef(float frequency);
+
+/*! \brief Find the frequency, in Hz, equivalent to a phase rate.
+    \param phase_rate The phase rate.
+    \return The equivalent frequency, in Hz.
+*/
+SPAN_DECLARE(float) dds_frequencyf(int32_t phase_rate);
+
+/*! \brief Find the scaling factor equivalent to a dBm0 value.
+    \param level The signal level in dBm0.
+    \return The equivalent scaling factor.
+*/
+SPAN_DECLARE(float) dds_scaling_dbm0f(float level);
+
+/*! \brief Find the scaling factor equivalent to a dBmov value.
+    \param level The signal level in dBmov.
+    \return The equivalent scaling factor.
+*/
+SPAN_DECLARE(float) dds_scaling_dbovf(float level);
+
+/*! \brief Advance the phase, without returning any new signal sample.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+*/
+SPAN_DECLARE(void) dds_advancef(uint32_t *phase_acc, int32_t phase_rate);
+
+/*! \brief Generate a floating point tone sample.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+    \return The signal amplitude, between -1.0 and 1.0.
+*/
+SPAN_DECLARE(float) ddsf(uint32_t *phase_acc, int32_t phase_rate);
+
+/*! \brief Lookup the floating point value of a specified phase.
+    \param phase The phase accumulator value to be looked up.
+    \return The signal amplitude, between -1.0 and 1.0.
+*/
+SPAN_DECLARE(float) dds_lookupf(uint32_t phase);
+
+/*! \brief Generate a floating point tone sample, with modulation.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+    \param scale The scaling factor.
+    \param phase The phase offset.
+    \return The signal amplitude, between -1.0 and 1.0.
+*/
+SPAN_DECLARE(float) dds_modf(uint32_t *phase_acc, int32_t phase_rate, float scale, int32_t phase);
+
+/*! \brief Generate a complex floating point tone sample.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+    \return The complex signal amplitude, between (-1.0, -1.0) and (1.0, 1.0).
+*/
+SPAN_DECLARE(complexf_t) dds_complexf(uint32_t *phase_acc, int32_t phase_rate);
+
+/*! \brief Lookup the complex value of a specified phase.
+    \param phase The phase accumulator value to be looked up.
+    \return The complex signal amplitude, between (-1.0, -1.0) and (1.0, 1.0).
+*/
+SPAN_DECLARE(complexf_t) dds_lookup_complexf(uint32_t phase_acc);
+
+/*! \brief Generate a complex floating point tone sample, with modulation.
+    \param phase_acc A pointer to a phase accumulator value.
+    \param phase_rate The phase increment to be applied.
+    \param scale The scaling factor.
+    \param phase The phase offset.
+    \return The complex signal amplitude, between (-1.0, -1.0) and (1.0, 1.0).
+*/
+SPAN_DECLARE(complexf_t) dds_complex_modf(uint32_t *phase_acc, int32_t phase_rate, float scale, int32_t phase);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif
+/*- End of file ------------------------------------------------------------*/