Sine_f32.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2012 ARM Limited
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy
00005  * of this software and associated documentation files (the "Software"), to deal
00006  * in the Software without restriction, including without limitation the rights
00007  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008  * copies of the Software, and to permit persons to whom the Software is
00009  * furnished to do so, subject to the following conditions:
00010  *
00011  * The above copyright notice and this permission notice shall be included in
00012  * all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
00020  * SOFTWARE.
00021  */
00022 #include "Sine_f32.h"
00023 #include "math_helper.h"
00024 
00025 #define RAD_2PI         (2. * PI)
00026 
00027 namespace dsp {
00028 
00029 Sine_f32::Sine_f32(uint32_t frequency, uint32_t sample_rate, float32_t amplitude, float32_t phase, uint32_t block_size) {
00030     _dx = RAD_2PI * ((float32_t)frequency / (float32_t)sample_rate);
00031     _amplitude = amplitude;
00032     _x = phase;
00033     _block_size = block_size;
00034 }
00035 
00036 void Sine_f32::process(float32_t *sgn_in, float32_t *sgn_out) {
00037     for (int i=0; i<_block_size; i++) {
00038         *sgn_out = *sgn_in + (_amplitude * arm_sin_f32(_x));
00039         sgn_in++; sgn_out++;
00040         _x += _dx;
00041     }
00042 }
00043 
00044 void Sine_f32::generate(float32_t *sgn) {
00045     for (int i=0; i<_block_size; i++) {
00046         *sgn = (_amplitude * arm_sin_f32(_x));
00047         sgn++;
00048         _x += _dx;
00049     }
00050 }
00051 
00052 void Sine_f32::reset(void) {
00053     _x = 0.0f;
00054 }
00055 
00056 }