<para>
The <guilabel>Processor</guilabel> control allows you to select a
-process to apply to the audio before it goes into the DCP. Three processes are currently provided:
+process to apply to the audio before it goes into the DCP. One process is currently provided:
</para>
<itemizedlist>
The remaining L/R parts will be kept in the L/R channels of the DCP.
This may be useful to make near-field L/R mixes more compatible with
cinema audio systems.</listitem>
-<listitem>Stereo to 5.1 up-mixer A — this will take a stereo input and up-mix it to ‘fake’ 5.1. The input L/R are treated as follows:
-<itemizedlist>
-<listitem>DCP L is input L bandpass-filtered between 1.9kHz and 4.8kHz.</listitem>
-<listitem>DCP R is input R bandpass-filtered between 1.9kHz and 4.8kHz.</listitem>
-<listitem>DCP C is input L mixed with input R, taken down by 3dB and then bandpass-filtered between 150Hz and 1.9kHz.</listitem>
-<listitem>DCP Lfe is input L mixed with input R, taken down by 3dB and then bandpass-filtered between 20Hz and 150Hz.</listitem>
-<listitem>DCP Ls is input L bandpass-filtered between 4.8kHz and 20kHz.</listitem>
-<listitem>DCP Rs is input R bandpass-filtered between 4.8kHz and 20kHz.</listitem>
</itemizedlist>
-<para>
-This upmixing algorithm is due to GĂ©rald Maruccia.
-</para>
-</listitem>
-<listitem>Stereo to 5.1 up-mixer B — this uses a different approach:
-<itemizedlist>
- <listitem>DCP L is input L.</listitem>
- <listitem>DCP R is input R.</listitem>
- <listitem>DCP C is input L + input R taken down by 3dB.</listitem>
- <listitem>DCP Lfe is DCP C bandpass filtered between 20Hz and 150Hz.</listitem>
- <listitem>DCP Ls and Rs are input L - input R with a 20ms delay.</listitem>
-</itemizedlist>
-</listitem>
-</itemizedlist>
-
-The up-mixers are not particularly advanced and should be used with care. You are strongly advised to check how the DCPs sound in a cinema if you have used one of DCP-o-matic's upmixers.
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