Re: Frequency Shifting & Hilbert Transforms

Date	1999-03-18 14:53
From	Jens Groh
Subject	Re: Frequency Shifting & Hilbert Transforms
	Roger Klaveness wrote: >Will this do the trick ? [......] > > ; Hilbert transform, 11-order FIR > igain = 1.570796327 > > axv0 init 0 > axv1 init 0 > axv2 init 0 > axv3 init 0 > axv4 init 0 > axv5 init 0 > axv6 init 0 > axv7 init 0 > axv8 init 0 > axv9 init 0 > axv10 init 0 > > axv0 = axv1 > axv1 = axv2 > axv2 = axv3 > axv3 = axv4 > axv4 = axv5 > axv5 = axv6 > axv6 = axv7 > axv7 = axv8 > axv8 = axv9 > axv9 = axv10 > axv10 = ain/igain; > > ahilb = .0160000000 * (axv0 - axv10) + .1326173942 * (axv2 - axv8) + .9121478174 * (axv4 - axv6) > ; ------------------------------------------------------------------ > > amod1 = ahilbasinmod > amod2 = ainacosmod > > outs amod2-amod1,amod1+amod2 > [......] Hi Roger! Probably it will, if you replace your delay line with one that has its taps at every sample, not every ksmps samples. Try it with the delay1 opcode. Or try to use the filter2 opcode which should be suitable to implement a FIR filter, too. Jens Groh Received: from shaun.maths.bath.ac.uk by omphalos.maths.Bath.AC.UK id aa19679; 18 Mar 99 17:11 GMT Received: from [144.173.6.14] (helo=exeter.ac.uk) by shaun.maths.bath.ac.uk with esmtp (Exim 1.92 #2) for jpff@maths.bath.ac.uk id 10NgKh-0004WN-00; Thu, 18 Mar 1999 17:11:47 +0000 Received: from noether [144.173.8.10] by hermes via SMTP (QAA15367); Thu, 18 Mar 1999 16:41:25 GMT Received: from exeter.ac.uk by maths.ex.ac.uk; Thu, 18 Mar 1999 16:41:06 GMT Received: from mhd1.moorhead.msus.edu [199.17.81.1] by hermes via ESMTP (QAA06140); Thu, 18 Mar 1999 16:40:59 GMT Received: from localhost by mhd1.moorhead.msus.edu (8.8.7/1.1.20.3/11Nov97-0622PM) id KAA0000005242; Thu, 18 Mar 1999 10:39:34 -0600 (CST) Date: Thu, 18 Mar 1999 10:39:34 -0600 (CST) From: Tesch David To: Csound List Subject: off the subject Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-csound-outgoing@maths.ex.ac.uk Precedence: bulk sorry to get off the subject, but has anyone heard that lame ORGY tune that Joy Division did a long time ago? I think it's called Blue Monday. anyway, the guitar tone is really cool. I think it sounds like the engineer processed the soundfile in Soundhack spectral compressor. i inevitably had to try it (im not a guitar player-what do i know) but did not get even similiar results. ANYONE KNOW? On the subject> I have built two compressors in Csound (for soundfiles) but they are rms type compressors. the rms command is not suitable for limiting, however. i have done some research and not found any command for finding the instantaniuos peak value on a sample by sample basis. i like the way digital compression sounds, as i have built a orc+sco that sets all sample values to the same value (except it's RMS value so there is still some amplitude variation) anyone's help would be appreciated. -Tracy Love Received: from shaun.maths.bath.ac.uk by omphalos.maths.Bath.AC.UK id aa20106; 18 Mar 99 19:38 GMT Received: from [144.173.6.14] (helo=exeter.ac.uk) by shaun.maths.bath.ac.uk with esmtp (Exim 1.92 #2) for jpff@maths.bath.ac.uk id 10Nicb-0004cm-00; Thu, 18 Mar 1999 19:38:25 +0000 Received: from noether [144.173.8.10] by hermes via SMTP (TAA09234); Thu, 18 Mar 1999 19:33:39 GMT Received: from exeter.ac.uk by maths.ex.ac.uk; Thu, 18 Mar 1999 19:33:28 GMT Received: from dns2.seanet.com [199.181.164.2] by hermes via ESMTP (TAA06896); Thu, 18 Mar 1999 19:33:24 GMT Received: from seanet.com (cy36.dialup.seanet.com [207.12.136.36]) by mx.seanet.com (8.8.8/Seanet-8.7.3) with ESMTP id LAA16830; Thu, 18 Mar 1999 11:33:15 -0800 (PST) Message-ID: <36F1563E.320B1801@seanet.com> Date: Thu, 18 Mar 1999 11:38:38 -0800 From: Sean Costello X-Mailer: Mozilla 4.05 [en] (Win95; I) MIME-Version: 1.0 To: Sergey Batov CC: csound@maths.ex.ac.uk Subject: Re: pitch in K-S algorithm References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-csound-outgoing@maths.ex.ac.uk Precedence: bulk Sergey Batov wrote: > Here are two examples of Karplus Strong Algorithm (from List). > > It seems that the pitches of notes are good enough in first example , > but not in second example. Why? > In the beginning I thought that this is because of LPF y[n]=(x[n]+x[n-1])/2 > in the second example, but using the 'tone' brings worst results. > > May be the pair "delayr - delayw" works more exactly than "delay"? Try using deltapi in conjunction with a delayr/delayw pair. delay will round the pitch off to the nearest integer sample number, which is bad for pitch accuracy at higher pitches. deltapi will interpolate between samples to get a more exact pitch, although the slight amount of delay of the LPF in the feedback loop will probably add a slight bit of pitch change. You should also note that the linear interpolation in deltapi will act very close to the LPF you describe in your example, so the tone and sustain of pitches will probably vary in some unpredictable ways. Sean Costello Received: from shaun.maths.bath.ac.uk by omphalos.maths.Bath.AC.UK id aa20115; 18 Mar 99 19:39 GMT Received: from [144.173.6.14] (helo=exeter.ac.uk) by shaun.maths.bath.ac.uk with esmtp (Exim 1.92 #2) for jpff@maths.bath.ac.uk id 10Nie0-0004cq-00; Thu, 18 Mar 1999 19:39:52 +0000 Received: from noether [144.173.8.10] by hermes via SMTP (TAA05747); Thu, 18 Mar 1999 19:37:07 GMT Received: from exeter.ac.uk by maths.ex.ac.uk; Thu, 18 Mar 1999 19:36:56 GMT Received: from dns2.seanet.com [199.181.164.2] by hermes via ESMTP (TAA15464); Thu, 18 Mar 1999 19:36:48 GMT Received: from seanet.com (cy36.dialup.seanet.com [207.12.136.36]) by mx.seanet.com (8.8.8/Seanet-8.7.3) with ESMTP id LAA17157; Thu, 18 Mar 1999 11:36:42 -0800 (PST) Message-ID: <36F1570C.3122A59C@seanet.com> Date: Thu, 18 Mar 1999 11:42:04 -0800 From: Sean Costello X-Mailer: Mozilla 4.05 [en] (Win95; I) MIME-Version: 1.0 To: Jens Groh CC: csound@maths.ex.ac.uk Subject: Re: Frequency Shifting & Hilbert Transforms References: <199903181159.MAA08047@nett.irt.de> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-csound-outgoing@maths.ex.ac.uk Precedence: bulk Jens Groh wrote: > P.S. Dear Sean Costello, would you like to tell us what you want to use the frequency shifter for? Frequency Shifting!! It's just a beautiful sound, plain and simple. I've heard it in Hyperprism, and it sounds beautiful, especially on voices. Plus, some nice paradoxical sounds can be generated with feedback - i.e. a phasing sound that goes in one direction only. Lots of stuff I want to explore. I'll be testing out the algorithms people posted early next week - just finished up some compositions for class last week, so ran out of time. Thanks for all the input on this one, folks! I've got some nice stuff to try out. I also have a friend at CCRMA who wrote a frequency shifter in CLM, so I might try to get that from him and translate it into Csound or C. I'll keep people posted. Sean Costello Received: from wallace.maths.bath.ac.uk by omphalos.maths.Bath.AC.UK id aa20310; 18 Mar 99 21:10 GMT Received: from [144.173.6.14] (helo=exeter.ac.uk) by wallace.maths.bath.ac.uk with esmtp (Exim 1.92 #2) for jpff@maths.bath.ac.uk id 10Nk3j-0000X2-00; Thu, 18 Mar 1999 21:10:31 +0000 Received: from noether [144.173.8.10] by hermes via SMTP (VAA18011); Thu, 18 Mar 1999 21:07:10 GMT Received: from exeter.ac.uk by maths.ex.ac.uk; Thu, 18 Mar 1999 21:06:58 GMT Received: from grynet.passagen.se [195.163.107.36] by hermes via ESMTP (VAA02781); Thu, 18 Mar 1999 21:06:56 GMT Received: from dumburk (dialup200-3-29.swipnet.se [130.244.200.157]) by grynet.passagen.se (8.8.6/8.8.6) with SMTP id WAA28124 for ; Thu, 18 Mar 1999 22:06:55 +0100 (MET) Message-ID: <36F16B81.6662@hem.passagen.se> Date: Thu, 18 Mar 1999 22:09:21 +0100 From: rasmus ekman X-Mailer: Mozilla 3.04 (Win95; I) MIME-Version: 1.0 To: Csound list Subject: peak (Re: off the subject) References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-csound-outgoing@maths.ex.ac.uk Precedence: bulk Tesch David wrote: > > i have done some research and not found any command > for finding the instantaniuos peak value on a sample by sample basis. You may be looking for peak/peakk. Not sure if they're in the main docs. re ******************** kpeak peakk ksig kpeak peak asig These opcodes maintain the output k rate variable as the peak absolute level so far received. peakk takes k-rate inputs and peak takes a-rate inputs. Received: from shaun.maths.bath.ac.uk by omphalos.maths.Bath.AC.UK id aa20364; 18 Mar 99 21:36 GMT Received: from [144.173.6.14] (helo=exeter.ac.uk) by shaun.maths.bath.ac.uk with esmtp (Exim 1.92 #2) for jpff@maths.bath.ac.uk id 10NkT9-0004fB-00; Thu, 18 Mar 1999 21:36:47 +0000 Received: from noether [144.173.8.10] by hermes via SMTP (VAA02066); Thu, 18 Mar 1999 21:35:06 GMT Received: from exeter.ac.uk by maths.ex.ac.uk; Thu, 18 Mar 1999 21:34:55 GMT Received: from exim@wallace.maths.bath.ac.uk [138.38.100.104] by hermes via ESMTP (VAA02674); Thu, 18 Mar 1999 21:34:54 GMT Received: from [138.38.97.36] (helo=maths.Bath.AC.UK ident=mmdf) by wallace.maths.bath.ac.uk with smtp (Exim 1.92 #2) for csound@maths.ex.ac.uk id 10NkRK-0000XQ-00; Thu, 18 Mar 1999 21:34:54 +0000 Date: Thu, 18 Mar 99 21:34:49 GMT From: J P Fitch To: csound@maths.ex.ac.uk Subject: peakk/peak Message-Id: Sender: owner-csound-outgoing@maths.ex.ac.uk Precedence: bulk Is there any reason why these are not both called peak as the discrimination on teh first argument is easy. ==John > > i have done some research and not found any command > for finding the instantaniuos peak value on a sample by sample basis. You may be looking for peak/peakk. Not sure if they're in the main docs. re Received: from wallace.maths.bath.ac.uk by omphalos.maths.Bath.AC.UK id aa20488; 18 Mar 99 22:49 GMT Received: from [144.173.6.14] (helo=exeter.ac.uk) by wallace.maths.bath.ac.uk with esmtp (Exim 1.92 #2) for jpff@maths.bath.ac.uk id 10NlbJ-0000Z6-00; Thu, 18 Mar 1999 22:49:17 +0000 Received: from noether [144.173.8.10] by hermes via SMTP (WAA03021); Thu, 18 Mar 1999 22:48:27 GMT Received: from exeter.ac.uk by maths.ex.ac.uk; Thu, 18 Mar 1999 22:48:15 GMT Received: from grynet.passagen.se [195.163.107.36] by hermes via ESMTP (WAA17262); Thu, 18 Mar 1999 22:48:14 GMT Received: from dumburk (dialup169-2-53.swipnet.se [130.244.169.117]) by grynet.passagen.se (8.8.6/8.8.6) with SMTP id XAA27510 for ; Thu, 18 Mar 1999 23:48:13 +0100 (MET) Message-ID: <36F18340.79EA@hem.passagen.se> Date: Thu, 18 Mar 1999 23:50:40 +0100 From: rasmus ekman X-Mailer: Mozilla 3.04 (Win95; I) MIME-Version: 1.0 To: Csound list Subject: Re: peakk/peak References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-csound-outgoing@maths.ex.ac.uk Precedence: bulk J P Fitch wrote: > > Is there any reason why [peak/peakk] are not both called peak Not at all in my opinion. Quite a few of the more recent opcodes have been unnecessarily split by type. Opcode writers, look at the pile of existing ugens to see how to make your code handle i/a/k-rate arguments transparently to the end-users! (and of course, thanks for all your hard work!!) Cheers, r the enduser Received: from shaun.maths.bath.ac.uk by omphalos.maths.Bath.AC.UK id aa20522; 18 Mar 99 23:13 GMT Received: from [138.38.32.81] (helo=mercury.bath.ac.uk ident=qmailr) by shaun.maths.bath.ac.uk with smtp (Exim 1.92 #2) for j.p.ffitch@maths.bath.ac.uk id 10Nlz2-0004hI-00; Thu, 18 Mar 1999 23:13:48 +0000 Received: (qmail 9434 invoked from network); 18 Mar 1999 23:13:27 -0000 Received: from amos.bath.ac.uk (qmailr@138.38.32.36) by mercury.bath.ac.uk with SMTP; 18 Mar 1999 23:13:27 -0000 Received: (qmail 15831 invoked by uid 1457); 18 Mar 1999 23:13:21 -0000 Mailing-List: contact xtcsound-help@lists.bath.ac.uk; run by ezmlm Precedence: bulk Delivered-To: mailing list xtcsound@lists.bath.ac.uk Received: (qmail 15819 invoked from network); 18 Mar 1999 23:13:20 -0000 Received: from pat.bath.ac.uk (qmailr@138.38.32.2) by amos.bath.ac.uk with SMTP; 18 Mar 1999 23:13:20 -0000 Received: (qmail 13483 invoked from network); 18 Mar 1999 23:13:19 -0000 Received: from adinet.analog.com (137.71.23.3) by pat.bath.ac.uk with SMTP; 18 Mar 1999 23:13:19 -0000 Received: by adinet.analog.com id SAA08689 (InterLock SMTP Gateway 3.0 for xtcsound@lists.bath.ac.uk); Thu, 18 Mar 1999 18:12:53 -0500 Received: by adinet.analog.com (Internal Mail Agent-1); Thu, 18 Mar 1999 18:12:53 -0500 Message-Id: From: "Vercoe, Scotty" To: CSOUND , XTCsound Cc: CSOUND SUPPORT Subject: xtcsound drivers Date: Thu, 18 Mar 1999 18:14:33 -0500 X-Mailer: Internet Mail Service (5.5.2232.9) We now have an upgrade of the XTCsound card drivers. To download, visit: http://www.geocities.com/researchtriangle/thinktank/2138/xtc.html thanks for your patience, Scotty Vercoe XTCsound Applications Consultant Analog Devices Software & Systems Technology Division Tel: (781) 461-3569 FAX: (781) 461-4291 Support: Csound.support@analog.com Website: http://www.geocities.com/researchtriangle/thinktank/2138/ Received: from wallace.maths.bath.ac.uk by omphalos.maths.Bath.AC.UK id aa20528; 18 Mar 99 23:14 GMT Received: from [144.173.6.14] (helo=exeter.ac.uk) by wallace.maths.bath.ac.uk with esmtp (Exim 1.92 #2) for jpff@maths.bath.ac.uk id 10Nlzg-0000ZZ-00; Thu, 18 Mar 1999 23:14:28 +0000 Received: from noether [144.173.8.10] by hermes via SMTP (XAA06328); Thu, 18 Mar 1999 23:13:31 GMT Received: from exeter.ac.uk by maths.ex.ac.uk; Thu, 18 Mar 1999 23:13:24 GMT Received: from adinet.analog.com [137.71.23.3] by hermes via SMTP (XAA13611); Thu, 18 Mar 1999 23:13:23 GMT Received: by adinet.analog.com id SAA08688 (InterLock SMTP Gateway 3.0 for csound@noether.ex.ac.uk); Thu, 18 Mar 1999 18:12:53 -0500 Received: by adinet.analog.com (Internal Mail Agent-1); Thu, 18 Mar 1999 18:12:53 -0500 Message-Id: From: "Vercoe, Scotty" To: CSOUND , XTCsound Cc: CSOUND SUPPORT Subject: xtcsound drivers Date: Thu, 18 Mar 1999 18:14:33 -0500 X-Mailer: Internet Mail Service (5.5.2232.9) Sender: owner-csound-outgoing@maths.ex.ac.uk Precedence: bulk We now have an upgrade of the XTCsound card drivers. To download, visit: http://www.geocities.com/researchtriangle/thinktank/2138/xtc.html thanks for your patience, Scotty Vercoe XTCsound Applications Consultant Analog Devices Software & Systems Technology Division Tel: (781) 461-3569 FAX: (781) 461-4291 Support: Csound.support@analog.com Website: http://www.geocities.com/researchtriangle/thinktank/2138/ Received: from wallace.maths.bath.ac.uk by omphalos.maths.Bath.AC.UK id aa20841; 19 Mar 99 2:38 GMT Received: from [144.173.6.14] (helo=exeter.ac.uk) by wallace.maths.bath.ac.uk with esmtp (Exim 1.92 #2) for jpff@maths.bath.ac.uk id 10NpBX-0000eJ-00; Fri, 19 Mar 1999 02:38:55 +0000 Received: from noether [144.173.8.10] by hermes via SMTP (CAA07212); Fri, 19 Mar 1999 02:37:54 GMT Received: from exeter.ac.uk by maths.ex.ac.uk; Fri, 19 Mar 1999 02:37:42 GMT Received: from crius.flash.net [209.30.0.49] by hermes via ESMTP (CAA08759); Fri, 19 Mar 1999 02:37:36 GMT Received: from flash.net (p252.amax50.dialup.ftw1.flash.net [209.30.160.252]) by crius.flash.net (8.9.1/8.8.5) with ESMTP id UAA25592 for ; Thu, 18 Mar 1999 20:37:34 -0600 (CST) Message-ID: <36F1B8C7.5EBA78E2@flash.net> Date: Thu, 18 Mar 1999 20:39:03 -0600 From: pete moss Organization: pete moss GmbH X-Mailer: Mozilla 4.51 [en] (Win98; I) X-Accept-Language: en MIME-Version: 1.0 To: csound Subject: csounders at seamus99 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-csound-outgoing@maths.ex.ac.uk Precedence: bulk are anyone of you csounders out there going to be at seamus99 next week in san jose? i will be there. i have a piece called 'descent' on the first concert at 1:30 on friday. look for me. it would be nice to meet some of my fellow csound users face to face. pete Received: from wallace.maths.bath.ac.uk by omphalos.maths.Bath.AC.UK id aa21485; 19 Mar 99 8:40 GMT Received: from [144.173.6.14] (helo=exeter.ac.uk) by wallace.maths.bath.ac.uk with esmtp (Exim 1.92 #2) for jpff@maths.bath.ac.uk id 10NupT-0000nO-00; Fri, 19 Mar 1999 08:40:31 +0000 Received: from noether [144.173.8.10] by hermes via SMTP (IAA06617); Fri, 19 Mar 1999 08:37:38 GMT Received: from exeter.ac.uk by maths.ex.ac.uk; Fri, 19 Mar 1999 08:37:27 GMT Received: from mailb.telia.com [194.22.194.6] by hermes via ESMTP (IAA15141); Fri, 19 Mar 1999 08:37:25 GMT Received: from d1o211.telia.com (root@d1o211.telia.com [195.204.228.241]) by mailb.telia.com (8.8.8/8.8.8) with ESMTP id JAA01378 for ; Fri, 19 Mar 1999 09:37:24 +0100 (CET) Received: from apas.no (t2o211p11.telia.com [195.204.228.71]) by d1o211.telia.com (8.8.8/8.8.5) with ESMTP id JAA17850 for ; Fri, 19 Mar 1999 09:37:21 +0100 (CET) Message-ID: <36F20CE4.9A3A1844@apas.no> Date: Fri, 19 Mar 1999 09:37:56 +0100 From: Roger Klaveness X-Mailer: Mozilla 4.5 [en] (WinNT; I) X-Accept-Language: en MIME-Version: 1.0 To: csound@maths.ex.ac.uk Subject: Re: Frequency Shifting & Hilbert Transforms References: <199903181453.PAA10932@nett.irt.de> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-csound-outgoing@maths.ex.ac.uk Precedence: bulk >Jens Groh wrote: > > Hi Roger! > Probably it will, if you replace your delay line with one that has its taps at every sample, ?? I'm using a-rate for the filter >not every ksmps samples. Try it with the delay1 opcode. Or try to use the filter2 opcode which >should be suitable to implement a FIR filter, too. > Jens Groh I have had difficulties with filter2 and zfilter2. Sometimes they just doesen't work ( coeffs generated by matlab and http://www.cs.york.ac.uk/~fisher/mkfilter ) That was with some Butterworth IIR-filters, I didn't try them out with the hilbert-FIR though. Anyway I think it is funny to implement a filter directly in csound-code ;-) > > Roger Klaveness wrote: > > >Will this do the trick ? > [......] > > > > ; Hilbert transform, 11-order FIR > > igain = 1.570796327 > > > > axv0 init 0 > > axv1 init 0 > > axv2 init 0 > > axv3 init 0 > > axv4 init 0 > > axv5 init 0 > > axv6 init 0 > > axv7 init 0 > > axv8 init 0 > > axv9 init 0 > > axv10 init 0 > > > > axv0 = axv1 > > axv1 = axv2 > > axv2 = axv3 > > axv3 = axv4 > > axv4 = axv5 > > axv5 = axv6 > > axv6 = axv7 > > axv7 = axv8 > > axv8 = axv9 > > axv9 = axv10 > > axv10 = ain/igain; > > > > ahilb = .0160000000 * (axv0 - axv10) + .1326173942 * (axv2 - axv8) + .9121478174 * (axv4 - axv6) > > ; ------------------------------------------------------------------ > > > > amod1 = ahilbasinmod > > amod2 = ainacosmod > > > > outs amod2-amod1,amod1+amod2 > > > [......] Received: from shaun.maths.bath.ac.uk by omphalos.maths.Bath.AC.UK id aa21604; 19 Mar 99 9:49 GMT Received: from [144.173.6.14] (helo=exeter.ac.uk) by shaun.maths.bath.ac.uk with esmtp (Exim 1.92 #2) for jpff@maths.bath.ac.uk id 10NvuX-0004x8-00; Fri, 19 Mar 1999 09:49:50 +0000 Received: from noether [144.173.8.10] by hermes via SMTP (JAA07924); Fri, 19 Mar 1999 09:41:00 GMT Received: from exeter.ac.uk by maths.ex.ac.uk; Fri, 19 Mar 1999 09:40:44 GMT Received: from zit-108.irt.de [194.172.230.108] by hermes via ESMTP (JAA09600); Fri, 19 Mar 1999 09:40:38 GMT Received: from pctb151 (pctb151.irt.de [192.168.3.151]) by nett.irt.de (8.9.1/8.9.1) with SMTP id KAA18864 for ; Fri, 19 Mar 1999 10:39:16 +0100 (MET) Date: Fri, 19 Mar 1999 10:39:16 +0100 (MET) Message-Id: <199903190939.KAA18864@nett.irt.de> X-Sender: groh@mail X-Mailer: Windows Eudora Version 1.4.4 Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" To: csound@maths.ex.ac.uk From: Jens Groh Subject: Re: Frequency Shifting & Hilbert Transforms Sender: owner-csound-outgoing@maths.ex.ac.uk Precedence: bulk > > > axv0 = axv1 > > > axv1 = axv2 > > > axv2 = axv3 > > > axv3 = axv4 > > > axv4 = axv5 > > > axv5 = axv6 > > > axv6 = axv7 > > > axv7 = axv8 > > > axv8 = axv9 > > > axv9 = axv10 > > > axv10 = ain/igain; > > > > [...] replace your delay line with one that has its taps at every sample, > > not every ksmps samples. Try it with the delay1 opcode. > > ?? > I'm using a-rate for the filter > Roger, I'm afraid there is a big misunderstanding! (Hope it's not on my side.) The a-rate operations in Csound code are _not_ executed every a-rate cycle. They are executed every k-rate cycle, but apply to a _vector_ of values. (The dimension of this vector is ksmps.) Jens Received: from shaun.maths.bath.ac.uk by omphalos.maths.Bath.AC.UK id aa21670; 19 Mar 99 10:24 GMT Received: from [144.173.6.14] (helo=exeter.ac.uk) by shaun.maths.bath.ac.uk with esmtp (Exim 1.92 #2) for jpff@maths.bath.ac.uk id 10NwSR-0004yo-00; Fri, 19 Mar 1999 10:24:51 +0000 Received: from noether [144.173.8.10] by hermes via SMTP (KAA02492); Fri, 19 Mar 1999 10:16:24 GMT Received: from exeter.ac.uk by maths.ex.ac.uk; Fri, 19 Mar 1999 10:15:56 GMT Received: from hawk.glasnet.ru [193.124.5.50] by hermes via ESMTP (KAA02285); Fri, 19 Mar 1999 10:15:53 GMT Received: from mail.glasnet.ru([193.124.5.37]) (1025 bytes) by hawk.glasnet.ru via sendmail with P:esmtp/R:inet_hosts/T:inet_zone_smtp (sender: ) id for ; Fri, 19 Mar 1999 13:15:13 +0300 (WSU) (Smail-3.2.0.104 1998-Nov-20 #2 built 1998-Nov-27) Received: from default(src addr [195.218.251.231]) (645 bytes) by mail.glasnet.ru via sendmail with P\:esmtp/R:smart_host/T:smtp (sender: ) id for ; Fri, 19 Mar 1999 13:15:06 +0300 (WSU) (Smail-3.2.0.96 1997-Jun-2 #11 built DST-Aug-25) Message-Id: From: Sergey Batov To: csound@maths.ex.ac.uk MMDF-Warning: Parse error in original version of preceding line at UK.AC.Bath.maths.omphalos Subject: simple LPF Date: Fri, 19 Mar 1999 13:15:04 +0300 X-MSMail-Priority: Normal X-Priority: 3 X-Mailer: Microsoft Internet Mail 4.70.1155 MIME-Version: 1.0 Content-Type: text/plain; charset=KOI8-R Content-Transfer-Encoding: 7bit Sender: owner-csound-outgoing@maths.ex.ac.uk Precedence: bulk Hi, sorry for "loop" but I'd like to ask it again: is it possible to know characteristics (cutoff frequency, e.t.c.) of the LPF: a3 delay1 a2 afeedback=(a2+a3)*.5 ? Thank you, Sergey Batov batov@glasnet.ru Received: from shaun.maths.bath.ac.uk by omphalos.maths.Bath.AC.UK id aa21694; 19 Mar 99 10:40 GMT Received: from [144.173.6.14] (helo=exeter.ac.uk) by shaun.maths.bath.ac.uk with esmtp (Exim 1.92 #2) for jpff@maths.bath.ac.uk id 10Nwhr-0004zL-00; Fri, 19 Mar 1999 10:40:47 +0000 Received: from noether [144.173.8.10] by hermes via SMTP (KAA17160); Fri, 19 Mar 1999 10:16:24 GMT Received: from exeter.ac.uk by maths.ex.ac.uk; Fri, 19 Mar 1999 10:15:56 GMT Received: from falcon.glasnet.ru [193.124.5.54] by hermes via ESMTP (KAA11650); Fri, 19 Mar 1999 10:15:46 GMT Received: from mail.glasnet.ru([193.124.5.37]) (1050 bytes) by falcon.glasnet.ru via sendmail with P:esmtp/R:inet_hosts/T:inet_zone_smtp (sender: ) id for ; Fri, 19 Mar 1999 13:15:14 +0300 (WSU) (Smail-3.2.0.104 1998-Nov-20 #2 built 1998-Nov-27) Received: from default(src addr [195.218.251.231]) (682 bytes) by mail.glasnet.ru via sendmail with P\:esmtp/R:smart_host/T:smtp (sender: ) id for ; Fri, 19 Mar 1999 13:14:58 +0300 (WSU) (Smail-3.2.0.96 1997-Jun-2 #11 built DST-Aug-25) Message-Id: From: Sergey Batov To: csound@maths.ex.ac.uk MMDF-Warning: Parse error in original version of preceding line at UK.AC.Bath.maths.omphalos Subject: parameters in K-S? Date: Fri, 19 Mar 1999 12:34:10 +0300 X-MSMail-Priority: Normal X-Priority: 3 X-Mailer: Microsoft Internet Mail 4.70.1155 MIME-Version: 1.0 Content-Type: text/plain; charset=KOI8-R Content-Transfer-Encoding: 7bit Sender: owner-csound-outgoing@maths.ex.ac.uk Precedence: bulk Dear Csounders! I'd like to know: is it possible to change "place of plucking" and time of decay in a simplest form of Karplus-Strong algorithm ("cycling" delay line + LPF)? Thanks in advance, Sergey Batov batov@glasnet.ru Received: from wallace.maths.bath.ac.uk by omphalos.maths.Bath.AC.UK id aa21753; 19 Mar 99 11:20 GMT Received: from [144.173.6.14] (helo=exeter.ac.uk) by wallace.maths.bath.ac.uk with esmtp (Exim 1.92 #2) for jpff@maths.bath.ac.uk id 10NxKZ-0000xH-00; Fri, 19 Mar 1999 11:20:47 +0000 Received: from noether [144.173.8.10] by hermes via SMTP (LAA09026); Fri, 19 Mar 1999 11:02:09 GMT Received: from exeter.ac.uk by maths.ex.ac.uk; Fri, 19 Mar 1999 11:01:57 GMT Received: from root@lix.intercom.es [194.179.21.2] by hermes via ESMTP (KAA03942); Fri, 19 Mar 1999 10:52:54 GMT Received: from intercom.es (iv2-161.intercom.es [195.76.206.161]) by lix.intercom.es (8.7.3/8.6.12) with ESMTP id LAA08610; Fri, 19 Mar 1999 11:59:07 +0100 Message-ID: <36F22BA2.7A822362@intercom.es> Date: Fri, 19 Mar 1999 11:49:07 +0100 From: Josep M Comajuncosas X-Mailer: Mozilla 4.05 [en] (Win95; I) MIME-Version: 1.0 To: Sergey Batov CC: csound@maths.ex.ac.uk Subject: Re: parameters in K-S? References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-csound-outgoing@maths.ex.ac.uk Precedence: bulk Sergey Batov wrote: > Dear Csounders! > I'd like to know: is it possible to change "place of plucking" > and time of decay in a simplest form of Karplus-Strong algorithm > ("cycling" delay line + LPF)? Yes, simply prefilter the excitation signal with a FIR comb filter.Time decay: loop filter gain at DC & filter cutoff (harmonic decay rate)