#pragma once /* This software is part of libcsdr, a set of simple DSP routines for Software Defined Radio. Copyright (c) 2014, Andras Retzler All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANDRAS RETZLER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ //predefined large arrays come here //De-emphasis FIR filters: //I chose not to implement a filter design algoritm for these, because: // - they are defined by their frequency envelope, and I didn't want to implement the least squares or similar algorithm to design such filters // - they are most likely needed at given fixed sample rates /*octave> function mkdeemph(sr,tapnum,norm_freq) % Make NFM deemphasis filter. Parameters: samplerate, filter length, frequency to normalize at (filter gain will be 0dB at this frequency) normalize_at_freq = @(vect,freq) vect/dot(vect,sin(2*pi*freq*[0:1/sr:size(vect)(1)/sr])); freqvect=[0,200, 200,400, 400,3700, 3700,sr/2]; coeffs=firls(tapnum,freqvect/(sr/2),[0,0,0,1,1,0.1,0,0]); coeffs=normalize_at_freq(coeffs,norm_freq); freqz(coeffs); printf("%g, ",coeffs); printf("\n") end */ //mkdeemph(48000,199,500) float deemphasis_nfm_predefined_fir_48000[] = { 0.00172568, 0.00179665, 0.00191952, 0.00205318, 0.00215178, 0.00217534, 0.00209924, 0.00192026, 0.00165789, 0.0013502, 0.00104545, 0.000790927, 0.000621911, 0.000553077, 0.000574554, 0.000653624, 0.000741816, 0.000785877, 0.000740151, 0.000577506, 0.000296217, -7.89273e-05, -0.0005017, -0.000914683, -0.00126243, -0.00150456, -0.00162564, -0.0016396, -0.00158725, -0.00152751, -0.00152401, -0.00163025, -0.00187658, -0.00226223, -0.00275443, -0.003295, -0.0038132, -0.00424193, -0.00453375, -0.00467274, -0.00467943, -0.00460728, -0.00453119, -0.00453056, -0.00467051, -0.00498574, -0.00547096, -0.00608027, -0.00673627, -0.00734698, -0.00782705, -0.00811841, -0.00820539, -0.00812057, -0.00793936, -0.00776415, -0.00770111, -0.00783479, -0.00820643, -0.00880131, -0.00954878, -0.0103356, -0.0110303, -0.011514, -0.0117094, -0.0116029, -0.0112526, -0.0107795, -0.010343, -0.0101053, -0.0101917, -0.0106561, -0.0114608, -0.0124761, -0.0135018, -0.0143081, -0.0146885, -0.0145126, -0.0137683, -0.0125796, -0.0111959, -0.00994914, -0.00918404, -0.00917447, -0.0100402, -0.0116822, -0.0137533, -0.0156723, -0.0166881, -0.0159848, -0.0128153, -0.00664117, 0.00274383, 0.0151313, 0.0298729, 0.0459219, 0.0619393, 0.076451, 0.0880348, 0.0955087, 0.098091, 0.0955087, 0.0880348, 0.076451, 0.0619393, 0.0459219, 0.0298729, 0.0151313, 0.00274383, -0.00664117, -0.0128153, -0.0159848, -0.0166881, -0.0156723, -0.0137533, -0.0116822, -0.0100402, -0.00917447, -0.00918404, -0.00994914, -0.0111959, -0.0125796, -0.0137683, -0.0145126, -0.0146885, -0.0143081, -0.0135018, -0.0124761, -0.0114608, -0.0106561, -0.0101917, -0.0101053, -0.010343, -0.0107795, -0.0112526, -0.0116029, -0.0117094, -0.011514, -0.0110303, -0.0103356, -0.00954878, -0.00880131, -0.00820643, -0.00783479, -0.00770111, -0.00776415, -0.00793936, -0.00812057, -0.00820539, -0.00811841, -0.00782705, -0.00734698, -0.00673627, -0.00608027, -0.00547096, -0.00498574, -0.00467051, -0.00453056, -0.00453119, -0.00460728, -0.00467943, -0.00467274, -0.00453375, -0.00424193, -0.0038132, -0.003295, -0.00275443, -0.00226223, -0.00187658, -0.00163025, -0.00152401, -0.00152751, -0.00158725, -0.0016396, -0.00162564, -0.00150456, -0.00126243, -0.000914683, -0.0005017, -7.89273e-05, 0.000296217, 0.000577506, 0.000740151, 0.000785877, 0.000741816, 0.000653624, 0.000574554, 0.000553077, 0.000621911, 0.000790927, 0.00104545, 0.0013502, 0.00165789, 0.00192026, 0.00209924, 0.00217534, 0.00215178, 0.00205318, 0.00191952, 0.00179665, 0.00172568 }; //mkdeemph(8000,79,500) float deemphasis_nfm_predefined_fir_8000[] = { 1.43777e+11, 1.45874e+11, -4.67746e+11, 9.98433e+10, -1.47835e+12, -3.78799e+11, -2.61333e+12, -1.07042e+12, -3.41242e+12, -1.57042e+12, -3.34195e+12, -1.4091e+12, -1.96864e+12, -2.26212e+11, 8.48259e+11, 2.04875e+12, 4.80451e+12, 5.06875e+12, 9.09434e+12, 8.04571e+12, 1.24874e+13, 9.85837e+12, 1.35433e+13, 9.28407e+12, 1.09287e+13, 5.30975e+12, 3.76762e+12, -2.54809e+12, -8.06152e+12, -1.39895e+13, -2.37664e+13, -2.77865e+13, -4.16745e+13, -4.16797e+13, -5.94708e+13, -5.17628e+13, -7.46014e+13, -4.66449e+13, -8.47575e+13, 1.51722e+14, 4.98196e+14, 1.51722e+14, -8.47575e+13, -4.66449e+13, -7.46014e+13, -5.17628e+13, -5.94708e+13, -4.16797e+13, -4.16745e+13, -2.77865e+13, -2.37664e+13, -1.39895e+13, -8.06152e+12, -2.54809e+12, 3.76762e+12, 5.30975e+12, 1.09287e+13, 9.28407e+12, 1.35433e+13, 9.85837e+12, 1.24874e+13, 8.04571e+12, 9.09434e+12, 5.06875e+12, 4.80451e+12, 2.04875e+12, 8.48259e+11, -2.26212e+11, -1.96864e+12, -1.4091e+12, -3.34195e+12, -1.57042e+12, -3.41242e+12, -1.07042e+12, -2.61333e+12, -3.78799e+11, -1.47835e+12, 9.98433e+10, -4.67746e+11, 1.45874e+11, 1.43777e+11 }; float deemphasis_nfm_predefined_fir_44100[] = { 0.0025158, 0.00308564, 0.00365507, 0.00413598, 0.00446279, 0.00461162, 0.00460866, 0.00452474, 0.00445739, 0.00450444, 0.00473648, 0.0051757, 0.0057872, 0.00648603, 0.00715856, 0.00769296, 0.00801081, 0.00809096, 0.00797853, 0.00777577, 0.00761627, 0.00762871, 0.00789987, 0.00844699, 0.00920814, 0.0100543, 0.0108212, 0.0113537, 0.011551, 0.0113994, 0.0109834, 0.0104698, 0.0100665, 0.00996618, 0.0102884, 0.0110369, 0.0120856, 0.0131998, 0.0140907, 0.0144924, 0.0142417, 0.0133401, 0.0119771, 0.0105043, 0.00935909, 0.00895022, 0.00952985, 0.0110812, 0.0132522, 0.015359, 0.0164664, 0.0155409, 0.0116496, 0.00416925, -0.00703664, -0.021514, -0.0382135, -0.0555955, -0.0718318, -0.0850729, -0.0937334, -0.0967458, -0.0937334, -0.0850729, -0.0718318, -0.0555955, -0.0382135, -0.021514, -0.00703664, 0.00416925, 0.0116496, 0.0155409, 0.0164664, 0.015359, 0.0132522, 0.0110812, 0.00952985, 0.00895022, 0.00935909, 0.0105043, 0.0119771, 0.0133401, 0.0142417, 0.0144924, 0.0140907, 0.0131998, 0.0120856, 0.0110369, 0.0102884, 0.00996618, 0.0100665, 0.0104698, 0.0109834, 0.0113994, 0.011551, 0.0113537, 0.0108212, 0.0100543, 0.00920814, 0.00844699, 0.00789987, 0.00762871, 0.00761627, 0.00777577, 0.00797853, 0.00809096, 0.00801081, 0.00769296, 0.00715856, 0.00648603, 0.0057872, 0.0051757, 0.00473648, 0.00450444, 0.00445739, 0.00452474, 0.00460866, 0.00461162, 0.00446279, 0.00413598, 0.00365507, 0.00308564, 0.0025158 }; //mkdeemph(11025,79,500) float deemphasis_nfm_predefined_fir_11025[] = { 0.00113162, 0.000911207, 0.00173815, -0.000341385, -0.000849373, -0.00033066, -0.00290692, -0.00357326, -0.0031917, -0.00607078, -0.00659201, -0.00601551, -0.00886603, -0.00880243, -0.00759841, -0.0100344, -0.0088993, -0.00664423, -0.00835258, -0.00572919, -0.00214109, -0.00302443, 0.00132902, 0.00627003, 0.00596494, 0.0120731, 0.0180437, 0.0176243, 0.0253776, 0.0316572, 0.0298485, 0.0393389, 0.0446019, 0.0389943, 0.0516463, 0.0521951, 0.0350192, 0.0600945, 0.0163128, -0.217526, -0.378533, -0.217526, 0.0163128, 0.0600945, 0.0350192, 0.0521951, 0.0516463, 0.0389943, 0.0446019, 0.0393389, 0.0298485, 0.0316572, 0.0253776, 0.0176243, 0.0180437, 0.0120731, 0.00596494, 0.00627003, 0.00132902, -0.00302443, -0.00214109, -0.00572919, -0.00835258, -0.00664423, -0.0088993, -0.0100344, -0.00759841, -0.00880243, -0.00886603, -0.00601551, -0.00659201, -0.00607078, -0.0031917, -0.00357326, -0.00290692, -0.00033066, -0.000849373, -0.000341385, 0.00173815, 0.000911207, 0.00113162 };