File:Notch 50Hz audio filter.svg

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Notch_50Hz_audio_filter.svg‎ (SVG file, nominally 461 × 346 pixels, file size: 166 KB)

[edit] Summary

Description

the frequency response of a digital filter to remove the 50Hz mains hum. I created it with the following Matlab code:

N=20000;     %resolution
fmax=20000; %max frequency of audible sound [Hz]
[num,den] = iirnotch(50/fmax,10/fmax);
[H,F]=freqz(num,den,N,2*fmax);
H=20*log10(abs(H));
semilogx(F,H,'LineWidth',2);
axis([10 fmax -20 5]);
xlabel('frequency [Hz]');
ylabel('amplitude [dB]');
grid on;

I saved it as EPS, then I converted it to SVG with Scribus and post-processed it with Inkscape.
Date

November 2007(2007-11)
Source

Own work
Author

Alessio Damato
Permission
(Reusing this image)

see below

[edit] Licensing

I, the copyright holder of this work, hereby publish it under the following licenses:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".

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Creative Commons license
Creative Commons Attribution iconCreative Commons Share Alike icon		 This file is licensed under the Creative Commons Attribution ShareAlike 3.0, Attribution ShareAlike 2.5, Attribution ShareAlike 2.0 and Attribution ShareAlike 1.0 License. In short: you are free to share and make derivative works of the file under the conditions that you appropriately attribute it, and that you distribute it only under a license identical to this one. Official license.

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Date/TimeThumbnailDimensionsUserComment
current19:26, 4 November 2007Thumbnail for version as of 19:26, 4 November 2007461×346 (166 KB)Alejo2083 (Talk | contribs) ({{Information |Description=the frequency response of a digital filter to remove the 50Hz mains hum. I created it with the following Matlab code: <source lang="Matlab"> N=20000; %resolution fmax=20000; %max frequency of audible sound [)

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