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DSP Filters and slopes?
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<blockquote data-quote="Peter Morris" data-source="post: 27167" data-attributes="member: 652"><p>Re: DSP Filters and slopes?</p><p></p><p></p><p> </p><p><span style="font-family: 'Arial'"><span style="font-size: 12px">What you are asking has more or less been available since about 1998 in the Lake Contour, which offers brick wall FIR filters with slopes of up to 180 dB/oct. </span></span></p><p> </p><p><span style="font-family: 'Arial'"><a href="http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/DLP_LinearPhaseCrossoversWhitePaper.pdf" target="_blank"><span style="font-size: 12px"><span style="color: #800080">http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/DLP_LinearPhaseCrossoversWhitePaper.pdf</span></span></a></span></p><p> </p><p><span style="font-family: 'Arial'"><span style="font-size: 12px">The filters are implemented using a tapped delay chain. As a result the time needed to implement a crossover is proportional to the period of the crossover frequency. Depending on you application this may or may not be a issue.</span></span></p><p> </p><p><span style="font-family: 'Arial'"><a href="http://en.wikipedia.org/wiki/Finite_impulse_response" target="_blank"><span style="color: #800080">http://en.wikipedia.org/wiki/Finite_impulse_response</span></a></span></p></blockquote><p></p>
[QUOTE="Peter Morris, post: 27167, member: 652"] Re: DSP Filters and slopes? [FONT=Arial][SIZE=3]What you are asking has more or less been available since about 1998 in the Lake Contour, which offers brick wall FIR filters with slopes of up to 180 dB/oct. [/SIZE][/FONT] [FONT=Arial][URL="http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/DLP_LinearPhaseCrossoversWhitePaper.pdf"][SIZE=3][COLOR=#800080]http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/DLP_LinearPhaseCrossoversWhitePaper.pdf[/COLOR][/SIZE][/URL][/FONT] [FONT=Arial][SIZE=3]The filters are implemented using a tapped delay chain. As a result the time needed to implement a crossover is proportional to the period of the crossover frequency. Depending on you application this may or may not be a issue.[/SIZE][/FONT] [FONT=Arial][URL="http://en.wikipedia.org/wiki/Finite_impulse_response"][COLOR=#800080]http://en.wikipedia.org/wiki/Finite_impulse_response[/COLOR][/URL][/FONT] [/QUOTE]
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