https://wiki.robotika.sk/robowiki/index.php?action=history&feed=atom&title=Spektr%C3%A1 2026-05-14T03:02:23Z Revision history for this page on the wiki MediaWiki 1.30.0 https://wiki.robotika.sk/robowiki/index.php?title=Spektr%C3%A1&diff=3214&oldid=prev 2008-06-18T22:12:21Z

<p></p> <table class="diff diff-contentalign-left" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr style="vertical-align: top;" lang="en"> <td colspan="2" style="background-color: white; color:black; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 22:12, 18 June 2008</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l42" >Line 42:</td> <td colspan="2" class="diff-lineno">Line 42:</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Image:spektrum.m]]</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Image:spektrum.m]]</div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Category:DSP]]</ins></div></td></tr> </table>

Balogh https://wiki.robotika.sk/robowiki/index.php?title=Spektr%C3%A1&diff=3182&oldid=prev 2008-06-18T14:24:25Z

<p></p> <p><b>New page</b></p><div>== Spektrá ==<br /> <br /> &lt;source lang=&quot;octave&quot;&gt;<br /> % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % <br /> % % <br /> % Takto sa kresli spektrum signalu typu Sinus s f 440 Hz. % <br /> % % <br /> % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % <br /> <br /> f_sample = 8000; % [Hz] - pre telefony OK <br /> duration = 1; % [s] - jedna sekunda <br /> freq = 440; % [Hz] - komorne A4 = 440 Hz <br /> A = 0.9; % [V] - amplituda signalu z &lt;-1,1&gt; <br /> <br /> time = 0 : (1/f_sample) : duration; <br /> SinusSignal = A * sin( 2*pi*freq*time + 0 ); <br /> <br /> T_sample = 1/f_sample; <br /> N = length(SinusSignal); <br /> <br /> maxtime = (N-1) * T_sample; % Doba trvania signalu <br /> <br /> time = (0:N-1) * T_sample; % Casova osa <br /> freq = (0:N-1) / maxtime; % Kmitoctova osa <br /> <br /> <br /> % Fourierova analyza: <br /> <br /> S = fft(SinusSignal); % Vypocet komplexneho spektra <br /> Mod = 2/N * abs(S); % Spravne amplitudove spektrum <br /> Pha = 180/pi * angle(S); % Fazove spektrum v stupnoch <br /> <br /> N1 = round(N/2); % Kreslime len relevantu cast po f_sample/2 <br /> <br /> subplot(2,1,1); <br /> plot(freq(1:N1),Mod(1:N1)); % Aplitudova frekvencna charakteristika <br /> <br /> subplot(2,1,2); <br /> plot(freq(1:N1),Pha(1:N1)); % Fazova frekvencna charakteristika<br /> <br /> &lt;/source&gt;<br /> <br /> [[Image:spektrum.m]]</div>

Balogh