http://avisynth.nl/index.php?action=history&feed=atom&title=BeFaBeFa - Revision history2026-06-02T03:37:47ZRevision history for this page on the wikiMediaWiki 1.19.24http://avisynth.nl/index.php?title=BeFa&diff=11796&oldid=prevReel.Deal: add Operation Overview and a few corrections2020-06-19T18:09:43Z<p>add Operation Overview and a few corrections</p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Description ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Description ==</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>[[BeFa]]: Band Eliminate Filter for Audio.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>[[BeFa]]: Band Eliminate Filter for Audio. <ins class="diffchange diffchange-inline">This plugin is designed to remove time signals by removing only specific frequency bands.<br></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">This is a ported version of the [https://www.marumo.ne.jp/auf/#befa AviUtl Filter Plug-in made by (MOGI, Kazuhiro).]</ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>'''Note''': the following documentation was translated from Japanese with online translators, it may not be 100% accurate.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>'''Note''': the following documentation was translated from Japanese with online translators, it may not be 100% accurate.</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>::{{Par2| |clip| }}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>::{{Par2| |clip| }}</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>:::Input clip.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>:::Input clip<ins class="diffchange diffchange-inline">; must have audio and only 16-bit audio is supported</ins>.</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>::{{Par2|sec|float|1.3}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>::{{Par2|sec|float|1.3}}</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:::Specify from 0 to 100%. If the graph is hard to see, lower the gain to make it easier to see.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:::Specify from 0 to 100%. If the graph is hard to see, lower the gain to make it easier to see.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div><br></div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div><br></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">==Operation Overview==</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">This filter is implemented as a FIR filter having a linear phase (group delay flat) characteristic by a real discrete Fourier transform (DFT). The product of the input sequence and the impulse response of the filter is convolved and the inverse DFT is performed to obtain the output sequence.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">    </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">The value specified for dftsize (2048 points by default) is set as one block, and 1/4 blocks are overlapped and the following filter processing is performed. (Overlap method)<br></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">In addition, in the overlapping portion, the ratio is linearly reduced in the front block and increased in the rear block, and finally added. It is decomposed into dftzise frequency components by real number DFT, and the band of radius (bandwidth+1) is blocked around the designated frequency band component.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">(By default, one bandwidth is sampling frequency/2/dftsize, which is 10Hz at 44.1KHz (11Hz at 48KHz), so 1000Hz is the center of -400 to +400Hz and 2000Hz is the center of -110 to +. Block 110Hz.)</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">However, if simply blocked by a rectangle, vibration (noise) with a frequency characteristic called the Gibbs phenomenon occurs. Therefore, as a preventive measure, an impulse sequence multiplied by a window function can be used. (Because this is cut off by a finite number of Fourier coefficients, the input sequence is in Audio 16bit format and is not normalized at the time of actual conversion, so 32768 times the actual value is calculated.</ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Examples ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== Examples ==</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>BeFa with default values filters for 1.3 seconds from the beginning and fades in for 0.3 seconds.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>BeFa with default values filters for 1.3 seconds from the beginning and fades in for 0.3 seconds.</div></td></tr>
</table>Reel.Dealhttp://avisynth.nl/index.php?title=BeFa&diff=11791&oldid=prevReel.Deal: /* Syntax and Parameters */ minor corrections2020-06-18T17:14:47Z<p><span dir="auto"><span class="autocomment">Syntax and Parameters: </span> minor corrections</span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>::{{Par2|bandwidth|int|40}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>::{{Par2|bandwidth|int|40}}</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>:::Sets the width of the removal frequency. Range: <del class="diffchange diffchange-inline">0 </del>to <del class="diffchange diffchange-inline">512</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>:::Sets the width of the removal frequency. Range: <ins class="diffchange diffchange-inline">1 </ins>to <ins class="diffchange diffchange-inline">1024</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:::Units are the number of points in the frequency domain after the discrete Fourier transform.  </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:::Units are the number of points in the frequency domain after the discrete Fourier transform.  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:::One unit of width is = sampling frequency / 2 / (2^dftsize) [Hz].</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:::One unit of width is = sampling frequency / 2 / (2^dftsize) [Hz].</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>::{{Par2|bandwidth2|int|-1}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>::{{Par2|bandwidth2|int|-1}}</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>:::Set the width of the second removal frequency. Range: <del class="diffchange diffchange-inline">-</del>1 to <del class="diffchange diffchange-inline">512</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>:::Set the width of the second removal frequency. Range: 1 to <ins class="diffchange diffchange-inline">1024</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:::When -1 is specified, <code>bandwidth2</code> = (bandwidth+7)/8</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:::When -1 is specified, <code>bandwidth2</code> = (bandwidth+7)/8</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:::*2 : Hamming window</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:::*2 : Hamming window</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:::*3 : Blackman window (Wide band, lacking sharpness, not suitable for time signal removal)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>:::*3 : Blackman window (Wide band, lacking sharpness, not suitable for time signal removal)</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>:::When specified, the frequency region specified by the width is not set to 0, but it is processed with a gentle characteristic so that it is close to 0 at the center and close to the original signal at the edges. When checking, use a wider width than usual.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>:::When specified, the frequency region specified by the width is not set to 0, but it is processed with a gentle characteristic so that it is close to 0 at the center and close to the original signal at the edges.</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">:::</ins>When checking, use a wider width than usual.</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>::{{Par2|mode|int|0}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>::{{Par2|mode|int|0}}</div></td></tr>
</table>Reel.Dealhttp://avisynth.nl/index.php?title=BeFa&diff=11789&oldid=prevReel.Deal: category2020-06-18T17:07:06Z<p>category</p>
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<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>{{<del class="diffchange diffchange-inline">FilterCat4</del>|External_filters|Plugins<del class="diffchange diffchange-inline">|Plugins_x64</del>|Audio_filters}}</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>{{<ins class="diffchange diffchange-inline">FilterCat</ins>|External_filters|Plugins|Audio_filters}}</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>{{Filter3</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>{{Filter3</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| 1={{Author/kiraru2002}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>| 1={{Author/kiraru2002}}</div></td></tr>
</table>Reel.Dealhttp://avisynth.nl/index.php?title=BeFa&diff=11788&oldid=prevReel.Deal: BeFa: add documentation (translated from Japanese with online translators)2020-06-18T17:06:18Z<p>BeFa: add documentation (translated from Japanese with online translators)</p>
<a href="http://avisynth.nl/index.php?title=BeFa&diff=11788&oldid=6785">Show changes</a>Reel.Dealhttp://avisynth.nl/index.php?title=BeFa&diff=6785&oldid=prevRaffriff42: redirect for convenient searching2015-11-08T05:02:54Z<p>redirect for convenient searching</p>
<p><b>New page</b></p><div>#REDIRECT [[External_filters#Audio_Filters]]<br />
{{FilterCat|External_filters|Audio_filters|}}</div>Raffriff42