127 lines
5.0 KiB
Matlab
127 lines
5.0 KiB
Matlab
%% Design effect EQs and bundle them to parameter block
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%%
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% Copyright (c) 2016, Intel Corporation
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% All rights reserved.
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%
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% Redistribution and use in source and binary forms, with or without
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% modification, are permitted provided that the following conditions are met:
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% * Redistributions of source code must retain the above copyright
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% notice, this list of conditions and the following disclaimer.
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% * Redistributions in binary form must reproduce the above copyright
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% notice, this list of conditions and the following disclaimer in the
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% documentation and/or other materials provided with the distribution.
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% * Neither the name of the Intel Corporation nor the
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% names of its contributors may be used to endorse or promote products
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% derived from this software without specific prior written permission.
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%
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% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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% POSSIBILITY OF SUCH DAMAGE.
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%
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% Author: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
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%
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function example_iir_eq()
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blob_fn = 'example_iir_eq.blob';
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alsa_fn = 'example_iir_eq.txt';
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endian = 'little';
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fs = 48e3;
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%% Design IIR loudness equalizer
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eq_loud = loudness_iir_eq(fs);
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%% Define a passthru IIR EQ equalizer
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[z_pass, p_pass, k_pass] = tf2zp([1 0 0],[1 0 0]);
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%% Quantize and pack filter coefficients plus shifts etc.
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bq_pass = eq_iir_blob_quant(z_pass, p_pass, k_pass);
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bq_loud = eq_iir_blob_quant(eq_loud.p_z, eq_loud.p_p, eq_loud.p_k);
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%% Build blob
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platform_max_channels = 4; % Setup max 4 channels EQ
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assign_response = [1 1 1 1]; % Switch to response #1
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num_responses = 2; % Two responses: pass, loud
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bm = eq_iir_blob_merge(platform_max_channels, ...
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num_responses, ...
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assign_response, ...
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[bq_pass bq_loud]);
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%% Pack and write file
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bp = eq_iir_blob_pack(bm);
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eq_blob_write(blob_fn, bp);
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eq_alsactl_write(alsa_fn, bp);
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end
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%%
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function eq = loudness_iir_eq(fs)
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%% Derived from Fletcher-Munson curves for 80 and 60 phon
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f = [ 20,21,22,24,25,27,28,30,32,34,36,38,40,43,45,48,51,54,57,60,64, ...
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68,72,76,81,85,90,96,102,108,114,121,128,136,144,153,162,171, ...
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182,192,204,216,229,243,257,273,289,306,324,344,364,386,409, ...
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434,460,487,516,547,580,614,651,690,731,775,821,870,922,977, ...
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1036,1098,1163,1233,1307,1385,1467,1555,1648,1747,1851,1962, ...
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2079,2203,2335,2474,2622,2779,2945,3121,3308,3505,3715,3937, ...
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4172,4421,4686,4966,5263,5577,5910,6264,6638,7035,7455,7901, ...
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8373,8873,9404,9966,10561,11193,11861,12570,13322,14118,14962, ...
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15856,16803,17808,18872,20000];
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m = [ 0.00,-0.13,-0.27,-0.39,-0.52,-0.64,-0.77,-0.89,-1.02,-1.16, ...
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-1.31,-1.46,-1.61,-1.76,-1.91,-2.07,-2.24,-2.43,-2.64,-2.85, ...
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-3.04,-3.21,-3.35,-3.48,-3.62,-3.78,-3.96,-4.16,-4.35,-4.54, ...
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-4.72,-4.90,-5.08,-5.26,-5.45,-5.64,-5.83,-6.02,-6.19,-6.37, ...
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-6.57,-6.77,-6.98,-7.19,-7.40,-7.58,-7.76,-7.92,-8.08,-8.25, ...
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-8.43,-8.60,-8.76,-8.92,-9.08,-9.23,-9.38,-9.54,-9.69,-9.84, ...
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-9.97,-10.09,-10.18,-10.26,-10.33,-10.38,-10.43,-10.48,-10.54, ...
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-10.61,-10.70,-10.78,-10.85,-10.91,-10.95,-10.98,-11.02, ...
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-11.05,-11.07,-11.10,-11.11,-11.11,-11.10,-11.10,-11.11, ...
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-11.14,-11.17,-11.20,-11.21,-11.22,-11.21,-11.20,-11.20, ...
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-11.21,-11.21,-11.20,-11.17,-11.11,-11.02,-10.91,-10.78, ...
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-10.63,-10.46,-10.25,-10.00,-9.72,-9.39,-9.02,-8.62,-8.19, ...
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-7.73,-7.25,-6.75,-6.25,-5.75,-5.28,-4.87,-4.54,-4.33,-4.30];
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%% Get defaults for equalizer design
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eq = eq_defaults();
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eq.fs = fs;
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eq.target_f = f;
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eq.target_m_db = m;
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eq.enable_iir = 1;
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eq.norm_type = 'loudness';
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eq.norm_offs_db = 0;
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%% Manually setup low-shelf and high shelf parametric equalizers
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%
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% Parametric EQs are PEQ_HP1, PEQ_HP2, PEQ_LP1, PEQ_LP2, PEQ_LS1,
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% PEQ_LS2, PEQ_HS1, PEQ_HS2 = 8, PEQ_PN2, PEQ_LP4, and PEQ_HP4.
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%
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% Parametric EQs take as second argument the cutoff frequency in Hz
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% and as second argument a dB value (or NaN when not applicable) . The
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% Third argument is a Q-value (or NaN when not applicable).
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eq.peq = [ ...
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eq.PEQ_LS1 40 +2 NaN ; ...
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eq.PEQ_LS1 80 +3 NaN ; ...
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eq.PEQ_LS1 200 +3 NaN ; ...
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eq.PEQ_LS1 400 +3 NaN ; ...
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eq.PEQ_HS2 13000 +7 NaN ; ...
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];
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%% Design EQ
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eq = eq_compute(eq);
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%% Plot
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eq_plot(eq);
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end
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