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Q to (Lake) Bandwidth converter
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<blockquote data-quote="Michael John" data-source="post: 5089" data-attributes="member: 830"><p>The difference in DSP processor's interpretation of Q and bandwidth has frequently been raised. (I think Bennett wrote an article on this some time back.)</p><p></p><p>Attached is a spreadsheet (written in the Dolby Lake days) for converting Q into the BW (bandwidth) value for biquad-based parametric filters in the XOVER and AUX tabs in the Lake controller. (The original posting can be found on the old Dolby Live Sound Forum <a href="http://dolby.invisionzone.com/index.php?showtopic=230" target="_blank">Q To Bandwidth Converter - Knowledge Base - Dolby Live Sound Forum</a>.)</p><p></p><p>[ATTACH]156611[/ATTACH]</p><p></p><p>This was often a starting point when migrating DSP presets into Lake processors. (My understanding is that it's still relevant for the new Lab Gruppen amps and processors.) I must stress "starting point" for a number of reasons. A filter defined for one sample rate may have a different response if entered into a processor running at a different sample rate (e.g. 48 versus 96 kHz). Also I've heard Q is sometimes interpreted differently by different processors. And, this spreadsheet doesn't deal with shelf filters. <span style="color: #0000cd">It's always good to verify with measurements.</span></p><p></p><p>Regards,</p><p>Michael</p></blockquote><p></p>
[QUOTE="Michael John, post: 5089, member: 830"] The difference in DSP processor's interpretation of Q and bandwidth has frequently been raised. (I think Bennett wrote an article on this some time back.) Attached is a spreadsheet (written in the Dolby Lake days) for converting Q into the BW (bandwidth) value for biquad-based parametric filters in the XOVER and AUX tabs in the Lake controller. (The original posting can be found on the old Dolby Live Sound Forum [URL="http://dolby.invisionzone.com/index.php?showtopic=230"]Q To Bandwidth Converter - Knowledge Base - Dolby Live Sound Forum[/URL].) [ATTACH]156611.vB5-legacyid=4371[/ATTACH] This was often a starting point when migrating DSP presets into Lake processors. (My understanding is that it's still relevant for the new Lab Gruppen amps and processors.) I must stress "starting point" for a number of reasons. A filter defined for one sample rate may have a different response if entered into a processor running at a different sample rate (e.g. 48 versus 96 kHz). Also I've heard Q is sometimes interpreted differently by different processors. And, this spreadsheet doesn't deal with shelf filters. [COLOR=#0000cd]It's always good to verify with measurements.[/COLOR] Regards, Michael [/QUOTE]
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