[Csnd] pitch accuracy of moogvcf

Date	2010-04-04 21:38
From	Eric Lyon
Subject	[Csnd] pitch accuracy of moogvcf
	Greetings, I've just tested the Csound implementation of moogvcf, and its resonant frequency seems sharp by about a whole tone. A hacked demo of the doc example is appended below. Please let me know if this discrepancy has been discussed before. Thanks in advance, Eric (Tested on OSX 10.6.2, Csound 5.12, Intel build) === ; Select audio/midi flags here according to platform ; Audio out Audio in No messages -odac -iadc -d ;;;RT audio I/O ; For Non-realtime ouput leave only the line below: ; -o moogvcf.wav -W ;;; for file output any platform ; Initialize the global variables. sr = 44100 kr = 4410 ksmps = 10 nchnls = 1 ; Instrument #1. instr 1 ; Use broadband noise asig randi 15000, 20000 ; Set the resonance amount to one. krez init 1 kfco init p4 ; Scale the amplitude to 32768. iscale = 32768 a1 moogvcf asig, kfco, krez, iscale out a1 endin instr 2 ifreq = p4 asinny oscil 5000, ifreq, 1 out asinny endin instr 3 iadjust = 1.12 ifreq = p4 * iadjust asinny oscil 5000, ifreq, 1 out asinny endin ; sine wave f 1 0 16384 10 1 ; Play Instrument #1 for three seconds. i1 0 5 440 ; note 1 i2 2 3 440 ; note 2 ; now replace note 2 with note 3 for a better fit ; i3 2 3 440 ; note 3 Send bugs reports to the Sourceforge bug tracker https://sourceforge.net/tracker/?group_id=81968&atid=564599 Discussions of bugs and features can be posted here To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"

Date	2010-04-04 22:03
From	Victor Lazzarini
Subject	[Csnd] Re: pitch accuracy of moogvcf
	Have you tried moogladder? Antti's paper seems to suggest it is better in that department. Victor On 4 Apr 2010, at 21:38, Eric Lyon wrote: > Greetings, > > I've just tested the Csound implementation of moogvcf, and its > resonant frequency seems sharp by about a whole tone. A hacked demo of > the doc example is appended below. Please let me know if this > discrepancy has been discussed before. > > Thanks in advance, > > Eric > > (Tested on OSX 10.6.2, Csound 5.12, Intel build) > > === > > > ; Select audio/midi flags here according to platform > ; Audio out Audio in No messages > -odac -iadc -d ;;;RT audio I/O > ; For Non-realtime ouput leave only the line below: > ; -o moogvcf.wav -W ;;; for file output any platform > > > > ; Initialize the global variables. > sr = 44100 > kr = 4410 > ksmps = 10 > nchnls = 1 > > ; Instrument #1. > instr 1 > ; Use broadband noise > asig randi 15000, 20000 > > ; Set the resonance amount to one. > krez init 1 > kfco init p4 > > ; Scale the amplitude to 32768. > iscale = 32768 > > a1 moogvcf asig, kfco, krez, iscale > > out a1 > endin > > instr 2 > ifreq = p4 > asinny oscil 5000, ifreq, 1 > out asinny > endin > > instr 3 > > iadjust = 1.12 > ifreq = p4 * iadjust > asinny oscil 5000, ifreq, 1 > out asinny > endin > > > > > > ; sine wave > f 1 0 16384 10 1 > > ; Play Instrument #1 for three seconds. > i1 0 5 440 ; note 1 > i2 2 3 440 ; note 2 > ; now replace note 2 with note 3 for a better fit > ; i3 2 3 440 ; note 3 > > > > > > > Send bugs reports to the Sourceforge bug tracker > https://sourceforge.net/tracker/?group_id=81968&atid=564599 > Discussions of bugs and features can be posted here > To unsubscribe, send email sympa@lists.bath.ac.uk with body > "unsubscribe csound" > Send bugs reports to the Sourceforge bug tracker https://sourceforge.net/tracker/?group_id=81968&atid=564599 Discussions of bugs and features can be posted here To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"

Date	2010-04-04 22:24
From	Eric Lyon
Subject	[Csnd] Re: Re: pitch accuracy of moogvcf
	Thanks, Victor. Will have a look. Eric On Sun, Apr 4, 2010 at 5:03 PM, Victor Lazzarini wrote: > Have you tried moogladder? Antti's paper seems to suggest it is better in > that department. > > Victor > On 4 Apr 2010, at 21:38, Eric Lyon wrote: > >> Greetings, >> >> I've just tested the Csound implementation of moogvcf, and its >> resonant frequency seems sharp by about a whole tone. A hacked demo of >> the doc example is appended below. Please let me know if this >> discrepancy has been discussed before. >> >> Thanks in advance, >> >> Eric >> >> (Tested on OSX 10.6.2, Csound 5.12, Intel build) >> >> === >> >> >> ; Select audio/midi flags here according to platform >> ; Audio out Audio in No messages >> -odac -iadc -d ;;;RT audio I/O >> ; For Non-realtime ouput leave only the line below: >> ; -o moogvcf.wav -W ;;; for file output any platform >> >> >> >> ; Initialize the global variables. >> sr = 44100 >> kr = 4410 >> ksmps = 10 >> nchnls = 1 >> >> ; Instrument #1. >> instr 1 >> ; Use broadband noise >> asig randi 15000, 20000 >> >> ; Set the resonance amount to one. >> krez init 1 >> kfco init p4 >> >> ; Scale the amplitude to 32768. >> iscale = 32768 >> >> a1 moogvcf asig, kfco, krez, iscale >> >> out a1 >> endin >> >> instr 2 >> ifreq = p4 >> asinny oscil 5000, ifreq, 1 >> out asinny >> endin >> >> instr 3 >> >> iadjust = 1.12 >> ifreq = p4 * iadjust >> asinny oscil 5000, ifreq, 1 >> out asinny >> endin >> >> >> >> >> >> ; sine wave >> f 1 0 16384 10 1 >> >> ; Play Instrument #1 for three seconds. >> i1 0 5 440 ; note 1 >> i2 2 3 440 ; note 2 >> ; now replace note 2 with note 3 for a better fit >> ; i3 2 3 440 ; note 3 >> >> >> >> >> >> >> Send bugs reports to the Sourceforge bug tracker >> https://sourceforge.net/tracker/?group_id=81968&atid=564599 >> Discussions of bugs and features can be posted here >> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe >> csound" >> > > > > Send bugs reports to the Sourceforge bug tracker > https://sourceforge.net/tracker/?group_id=81968&atid=564599 > Discussions of bugs and features can be posted here > To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe > csound" > > Send bugs reports to the Sourceforge bug tracker https://sourceforge.net/tracker/?group_id=81968&atid=564599 Discussions of bugs and features can be posted here To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"