<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office"><head><!--[if gte mso 9]><xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>96</o:PixelsPerInch></o:OfficeDocumentSettings></xml><![endif]--></head><body><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div><div>Hi Simon,<br><div><br><div>I remember trying to extract such information from pd-list members about 13 years ago...the silence was deafening!<br><div><br><div>I remember trying to get some help with why my ported lpc object wasn't initalizing properly earlier this week- also silence.<br><div><br><div>However, I soldier on regardless. If you have any ideas about why my mbc_lpc~ object doesn't load then please hack it and return(github details at the bottom) but also take a look at the original code for mbc.allpass~ - it contains various methods that are commented out for calculating filter coefficients, and there may be some clues in there for you to pick at.<br><div><br><div>I've never quite got to the bottom of calculating Line Spectrum Frequencies and manipulating these as formants, but it sounds like the project I was trying to pursue so many years ago (before my idiot managers pulled the funding and tried tobotch their own project together).<br><div><br><div>Anyway - here's how far I've got with the port - do you think you could share ideas and code with me? it may speed things up at my end...<br><div><br><div>Ed<br><div><br><div><a href="https://github.com/edkellytista9/LPCToolkitPd" rel="nofollow" target="_blank" class="enhancr_card_4794940851">edkellytista9/LPCToolkitPd</a><br><br></div><div><br></div><div id="ydp467f722benhancr_card_4794940851" class="ydp467f722byahoo-link-enhancr-card ydp467f722bymail-preserve-class ydp467f722bymail-preserve-style" style="max-width:400px;font-family:"Helvetica Neue", "Segoe UI", Helvetica, Arial, sans-serif;" data-url="https://github.com/edkellytista9/LPCToolkitPd" data-type="YENHANCER" data-size="MEDIUM" contenteditable="false"><a href="https://github.com/edkellytista9/LPCToolkitPd" style="text-decoration:none !important;color:#000 !important;" class="ydp467f722byahoo-enhancr-cardlink" rel="nofollow" target="_blank"><table class="ydp467f722bcard-wrapper ydp467f722byahoo-ignore-table" style="max-width:400px;" cellspacing="0" cellpadding="0" border="0"><tbody><tr><td width="400"><table class="ydp467f722bcard ydp467f722byahoo-ignore-table" style="max-width:400px;border-width:1px;border-style:solid;border-color:rgb(224, 228, 233);border-radius:2px;" width="100%" cellspacing="0" cellpadding="0" border="0"><tbody><tr><td class="ydp467f722bcard-primary-image-cell" style="background-image: url("https://s.yimg.com/lo/api/res/1.2/jqHWAqCCiWknR31BSHs_Ug--~A/Zmk9ZmlsbDt3PTQwMDtoPTIwMDthcHBpZD1pZXh0cmFjdA--/https://avatars0.githubusercontent.com/u/1565006?s=400&v=4.cf.jpg"); 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On Wednesday, 18 April 2018, 14:31:43 GMT+1, Simon Iten <itensimon@gmail.com> wrote:
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<div><div dir="ltr">calculate the zeroes (roots) of the polynomial i guess.<br clear="none"><br clear="none">still hints are very welcome :)<br clear="none"><div class="yqt1747527099" id="yqtfd78990"><br clear="none">> On 18 Apr 2018, at 11:51, Simon Iten <<a shape="rect" ymailto="mailto:itensimon@gmail.com" href="mailto:itensimon@gmail.com">itensimon@gmail.com</a>> wrote:<br clear="none">> <br clear="none">> hi list,<br clear="none">> <br clear="none">> this is more of a general DSP question...<br clear="none">> <br clear="none">> i am working on an LPC playback and mangling system for axoloti. i have most of it working and i am now trying to shift formants in the filter to change voice character. i found functions to convert reflection coefficients into polynomial pairs and presumably i should be able to shift filter frequencies in this representation of the data. unfortunately i have no clue how to do that. any hints, papers, code snippets etc. are very welcome.<br clear="none">> <br clear="none">> or if someone wants to take the time to explain, you are of course more then welcome<br clear="none">> <br clear="none">> thanks for any suggestions<br clear="none">> <br clear="none">> <br clear="none"><br clear="none"><br clear="none">_______________________________________________<br clear="none"><a shape="rect" ymailto="mailto:Pd-list@lists.iem.at" href="mailto:Pd-list@lists.iem.at">Pd-list@lists.iem.at</a> mailing list<br clear="none">UNSUBSCRIBE and account-management -> <a shape="rect" href="https://lists.puredata.info/listinfo/pd-list" target="_blank">https://lists.puredata.info/listinfo/pd-list</a><br clear="none"></div></div></div>
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