mirror of https://github.com/thesofproject/sof.git
65 lines
1.5 KiB
Matlab
65 lines
1.5 KiB
Matlab
function drc_plot_db_curve(coefs);
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if exist('OCTAVE_VERSION', 'builtin')
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pkg load control;
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endif
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db_thres = coefs.db_threshold;
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db_knee_thres = db_thres + coefs.db_knee;
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% Plot range of db_x determined by db_thres and db_knee_thres
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db_x_center = (db_thres + db_knee_thres) / 2;
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db_x_half_range = max(coefs.db_knee, 20);
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db_x_start = db_x_center - db_x_half_range;
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db_x_end = db_x_center + db_x_half_range;
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db_xs = linspace(db_x_start, db_x_end, 100);
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db_ys = db_curve(coefs, db_xs);
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% Plot the x-y dB curve
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plot(db_xs, db_ys, "b");
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hold on
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grid on
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% Plot the reference line: x = db_thres
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plot([db_thres, db_thres], [db_ys(1), db_knee_thres], "g");
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hold on
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% Plot the reference line: x = db_knee_thres
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plot([db_knee_thres, db_knee_thres], [db_ys(1), db_knee_thres], "g");
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hold on
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% Plot the reference line: y = x
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plot([db_xs(1), db_knee_thres], [db_xs(1), db_knee_thres], "r");
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hold off
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%pause();
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end
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function db_ys = db_curve(coefs, db_xs);
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db_thres = coefs.db_threshold;
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db_knee_thres = db_thres + coefs.db_knee;
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db_thres_y = db_knee_curve(coefs, db_thres);
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db_knee_thres_y = db_knee_curve(coefs, db_knee_thres);
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for i = 1:100
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db_x = db_xs(i);
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if db_x < db_thres
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db_ys(i) = db_thres_y + (db_x - db_thres);
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elseif db_x > db_knee_thres
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db_ys(i) = db_knee_thres_y + coefs.slope * (db_x - db_knee_thres);
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else
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% Among knee curve
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db_ys(i) = db_knee_curve(coefs, db_x);
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endif
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end
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end
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function db_y = db_knee_curve(coefs, db_x);
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x = db2mag(db_x);
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y = coefs.knee_alpha + coefs.knee_beta * exp(-coefs.K * x);
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db_y = mag2db(y);
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end
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