Mercurial > hg > audiostuff
diff spandsp-0.0.6pre17/src/dds_float.c @ 4:26cd8f1ef0b1
import spandsp-0.0.6pre17
| author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
|---|---|
| date | Fri, 25 Jun 2010 15:50:58 +0200 |
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| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/spandsp-0.0.6pre17/src/dds_float.c Fri Jun 25 15:50:58 2010 +0200 @@ -0,0 +1,2189 @@ +/* + * SpanDSP - a series of DSP components for telephony + * + * complex_dds.c + * + * 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_float.c,v 1.11 2009/02/03 16:28:39 steveu Exp $ + */ + +/*! \file */ + +#if defined(HAVE_CONFIG_H) +#include "config.h" +#endif + +#include <stdio.h> +#include <inttypes.h> +#if defined(HAVE_TGMATH_H) +#include <tgmath.h> +#endif +#if defined(HAVE_MATH_H) +#include <math.h> +#endif +#include "floating_fudge.h" + +#include "spandsp/telephony.h" +#include "spandsp/complex.h" +#include "spandsp/dds.h" + +#define SLENK 11 +#define SINELEN (1 << SLENK) + +/* Precreating this table allows it to be in const memory, which might + have some performance advantage. */ +static const float sine_table[SINELEN] = +{ + 0.00000000f, + 0.00306796f, + 0.00613588f, + 0.00920375f, + 0.01227154f, + 0.01533921f, + 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(int32_t) (frequency*65536.0f*65536.0f/SAMPLE_RATE); +} +/*- End of function --------------------------------------------------------*/ + +SPAN_DECLARE(float) dds_frequencyf(int32_t phase_rate) +{ + return (float) phase_rate*(float) SAMPLE_RATE/(65536.0f*65536.0f); +} +/*- End of function --------------------------------------------------------*/ + +SPAN_DECLARE(float) dds_scaling_dbm0f(float level) +{ + return powf(10.0f, (level - DBM0_MAX_SINE_POWER)/20.0f)*32767.0f; +} +/*- End of function --------------------------------------------------------*/ + +SPAN_DECLARE(float) dds_scaling_dbovf(float level) +{ + return powf(10.0f, (level - DBOV_MAX_SINE_POWER)/20.0f)*32767.0f; +} +/*- End of function --------------------------------------------------------*/ + +SPAN_DECLARE(void) dds_advancef(uint32_t *phase_acc, int32_t phase_rate) +{ + *phase_acc += phase_rate; +} +/*- End of function --------------------------------------------------------*/ + +SPAN_DECLARE(float) ddsf(uint32_t *phase_acc, int32_t phase_rate) +{ + float amp; + + amp = sine_table[*phase_acc >> (32 - SLENK)]; + *phase_acc += phase_rate; + return amp; +} +/*- End of function --------------------------------------------------------*/ + +SPAN_DECLARE(float) dds_lookupf(uint32_t phase) +{ + return sine_table[phase >> (32 - SLENK)]; +} +/*- End of function --------------------------------------------------------*/ + +SPAN_DECLARE(float) dds_modf(uint32_t *phase_acc, int32_t phase_rate, float scale, int32_t phase) +{ + float amp; + + amp = sine_table[*(phase_acc + phase) >> (32 - SLENK)]*scale; + *phase_acc += phase_rate; + return amp; +} +/*- End of function --------------------------------------------------------*/ + +SPAN_DECLARE(complexf_t) dds_complexf(uint32_t *phase_acc, int32_t phase_rate) +{ + complexf_t amp; + + amp = complex_setf(sine_table[(*phase_acc + (1 << 30)) >> (32 - SLENK)], + sine_table[*phase_acc >> (32 - SLENK)]); + *phase_acc += phase_rate; + return amp; +} +/*- End of function --------------------------------------------------------*/ + +SPAN_DECLARE(complexf_t) dds_lookup_complexf(uint32_t phase) +{ + return complex_setf(sine_table[(phase + (1 << 30)) >> (32 - SLENK)], + sine_table[phase >> (32 - SLENK)]); +} +/*- End of function --------------------------------------------------------*/ + +SPAN_DECLARE(complexf_t) dds_complex_modf(uint32_t *phase_acc, int32_t phase_rate, float scale, int32_t phase) +{ + complexf_t amp; + + amp = complex_setf(sine_table[(*phase_acc + phase + (1 << 30)) >> (32 - SLENK)]*scale, + sine_table[(*phase_acc + phase) >> (32 - SLENK)]*scale); + *phase_acc += phase_rate; + return amp; +} +/*- End of function --------------------------------------------------------*/ +/*- End of file ------------------------------------------------------------*/