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Junior Varsity
out of band eq filters
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<blockquote data-quote="Peter Morris" data-source="post: 41444" data-attributes="member: 652"><p>Re: out of band eq filters</p><p></p><p></p><p></p><p></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"><span style="color: black">Very generally, the frequency response of a transducer is directly related to its phase response – flatten the amplitude response and you will have a flat phase response (except for things caused by non- linear behavior such as cone breakup etc.) </span><span style="color: #3e3e3e"><span style="font-family: 'Tahoma'"></span></span></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"><span style="color: #3e3e3e"><span style="font-family: 'Tahoma'"></span></span></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"><span style="color: #3e3e3e"><span style="font-family: 'Tahoma'"></span></span><span style="color: black">If a speaker has a 10 dB resonant peak “out of band”, unless the crossover causes it to be at least 30dB down compared to the in band level, you will still hear it as an artifact. You may not see it in the amplitude response but you will see it the energy time curve (ETC).</span><span style="color: #3e3e3e"><span style="font-family: 'Tahoma'"></span></span></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"><span style="color: #3e3e3e"><span style="font-family: 'Tahoma'"></span></span></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"><span style="color: #3e3e3e"><span style="font-family: 'Tahoma'"></span></span><span style="color: black">If you flatten the amplitude response and get ride of the resonant peak, it will flatten the phase and there will be no out of band artifacts … and no need to modify the phase with an out of band filter.</span><span style="color: #3e3e3e"><span style="font-family: 'Tahoma'"></span></span></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"><span style="color: #3e3e3e"><span style="font-family: 'Tahoma'"></span></span></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"><span style="color: #3e3e3e"><span style="font-family: 'Tahoma'"></span></span><span style="color: black">If you have issues with phase irregularities caused by non-linear behavior within transducer, I would suggest that you really need to start looking at modifying amplitude and phase separately with FIR filters … not a trivial </span></span></span></span><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'">exercise. </span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'">Peter </span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'">Here is a bit more ...</span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'">Your focus seems to be on crossovers and phase – here are a few papers that maybe of interest.</span></span></span></p><p> <span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"><a href="http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/DLP_LinearPhaseCrossoversWhitePaper.pdf" target="_blank"><span style="color: #800080">http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/DLP_LinearPhaseCrossoversWhitePaper.pdf</span></a></span></span></span></p><p> <span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"><a href="http://www.rane.com/note147.html" target="_blank"><span style="color: #800080">http://www.rane.com/note147.html</span></a></span></span></span></p><p> <span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"><a href="http://www.excelsior-audio.com/Publications/Crossover/Crossover1.html" target="_blank"><span style="color: #800080">http://www.excelsior-audio.com/Publications/Crossover/Crossover1.html</span></a></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Times New Roman'"></span></span></span></p></blockquote><p></p>
[QUOTE="Peter Morris, post: 41444, member: 652"] Re: out of band eq filters [SIZE=3][COLOR=#000000][FONT=Times New Roman][COLOR=black]Very generally, the frequency response of a transducer is directly related to its phase response – flatten the amplitude response and you will have a flat phase response (except for things caused by non- linear behavior such as cone breakup etc.) [/COLOR][COLOR=#3e3e3e][FONT=Tahoma] [/FONT][/COLOR][COLOR=black]If a speaker has a 10 dB resonant peak “out of band”, unless the crossover causes it to be at least 30dB down compared to the in band level, you will still hear it as an artifact. You may not see it in the amplitude response but you will see it the energy time curve (ETC).[/COLOR][COLOR=#3e3e3e][FONT=Tahoma] [/FONT][/COLOR][COLOR=black]If you flatten the amplitude response and get ride of the resonant peak, it will flatten the phase and there will be no out of band artifacts … and no need to modify the phase with an out of band filter.[/COLOR][COLOR=#3e3e3e][FONT=Tahoma] [/FONT][/COLOR][COLOR=black]If you have issues with phase irregularities caused by non-linear behavior within transducer, I would suggest that you really need to start looking at modifying amplitude and phase separately with FIR filters … not a trivial [/COLOR][/FONT][/COLOR][/SIZE][SIZE=3][COLOR=#000000][FONT=Times New Roman]exercise. Peter Here is a bit more ... Your focus seems to be on crossovers and phase – here are a few papers that maybe of interest. [URL="http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/DLP_LinearPhaseCrossoversWhitePaper.pdf"][COLOR=#800080]http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/DLP_LinearPhaseCrossoversWhitePaper.pdf[/COLOR][/URL] [URL="http://www.rane.com/note147.html"][COLOR=#800080]http://www.rane.com/note147.html[/COLOR][/URL] [URL="http://www.excelsior-audio.com/Publications/Crossover/Crossover1.html"][COLOR=#800080]http://www.excelsior-audio.com/Publications/Crossover/Crossover1.html[/COLOR][/URL] [/FONT][/COLOR][/SIZE] [/QUOTE]
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