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[Csnd] What's the highest quality sawtooth in Csound?

Date2010-09-27 01:18
FromMarcel de Velde
Subject[Csnd] What's the highest quality sawtooth in Csound?
I'm writing a csound instrument that plays back microtuned midi files for research into microtuning (Just Intonation).
I'll be listening very carefully to the tuned results, Just Intonation research is a mix of math and the ear.
Ideally I'd like to use a perfect sawtooth wave without any imperfections that may make things less clear to the ear, as I've found that with lesser quality sawtooths the imperfections can generate things that can obscure (or mimic) beats and difference tones (which are important to be heard clearly for my research).

Am I right in thinking that the VCO2 opcode will give the best quality sawtooth in Csound?
Or are there better ways to make a bandlimited sawtooth?
I do not care at all about the memory / processor power involved as I won't need to use it realtime.

Thanks for any insights!

-Marcel

Date2010-09-27 04:27
FromGreg Schroeder
Subject[Csnd] Re: What's the highest quality sawtooth in Csound?
There's a few approaches.
Additive:
Go down to the yellow table. Express those values in the ftable as
decimals. If you'd like, observe the pattern for the sawtooth wave's
partial values and enter more values.
http://www.csounds.com/ezine/spectra/
and gen10's manual entry:
http://www.csounds.com/manualOLPC/GEN10.html

Or just draw a sawtooth wave with straight lines:
http://www.csounds.com/manualOLPC/GEN07.html



Those are the two most-obvious ones.

Greg



Use however many partials and adjust the size of the table to whatever
definition of "quality" you'd like.
That's the most precise way I know to make an audio-rate sawtooth wave.

Greg

On Mon, Sep 27, 2010 at 9:18 AM, Marcel de Velde  wrote:
> I'm writing a csound instrument that plays back microtuned midi files for
> research into microtuning (Just Intonation).
> I'll be listening very carefully to the tuned results, Just Intonation
> research is a mix of math and the ear.
> Ideally I'd like to use a perfect sawtooth wave without any imperfections
> that may make things less clear to the ear, as I've found that with lesser
> quality sawtooths the imperfections can generate things that can obscure (or
> mimic) beats and difference tones (which are important to be heard clearly
> for my research).
>
> Am I right in thinking that the VCO2 opcode will give the best quality
> sawtooth in Csound?
> Or are there better ways to make a bandlimited sawtooth?
> I do not care at all about the memory / processor power involved as I won't
> need to use it realtime.
>
> Thanks for any insights!
>
> -Marcel
>


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            https://sourceforge.net/tracker/?group_id=81968&atid=564599
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Date2010-09-27 05:23
FromMarcel de Velde
Subject[Csnd] Re: Re: What's the highest quality sawtooth in Csound?
Hi Greg,

Thanks for your help!


There's a few approaches.
Additive:
Go down to the yellow table. Express those values in the ftable as
decimals. If you'd like, observe the pattern for the sawtooth wave's
partial values and enter more values.
http://www.csounds.com/ezine/spectra/
and gen10's manual entry:
http://www.csounds.com/manualOLPC/GEN10.html

Ok so then I call gen10 for every note that's played (make a big new table for each note) to make the harmonics from the note frequency up till the nyquist and then use for instance poscil3 to play the note?
Just to be sure I got that right before I go figure out how to do that (I'm very much a csound programming newbie)

 

Or just draw a sawtooth wave with straight lines:
http://www.csounds.com/manualOLPC/GEN07.html

That will give me a lot of aliasing. Can't have that for my use.
 



Those are the two most-obvious ones.

Greg



Use however many partials and adjust the size of the table to whatever
definition of "quality" you'd like.
That's the most precise way I know to make an audio-rate sawtooth wave.

Greg


Still wondering if the method above will give a better audio quality than VCO2.
Do you know why or in which way VCO2 gives inferior results?
VCO2 would be way simpler but if it's lacking in quality then I'll do it the other way..

-Marcel


Date2010-09-27 05:29
FromCorbin Simpson
Subject[Csnd] Re: Re: Re: What's the highest quality sawtooth in Csound?

vco2 has been perfectly acceptable for me. I don't believe that a hand-rolled ioscil is any better, based on how the vco family is implemented.

Sending from a mobile, pardon the brevity. ~ C.

On Sep 26, 2010 9:23 PM, "Marcel de Velde" <m.develde@gmail.com> wrote:
> Hi Greg,
>
> Thanks for your help!
>
>
> There's a few approaches.
>> Additive:
>> Go down to the yellow table. Express those values in the ftable as
>> decimals. If you'd like, observe the pattern for the sawtooth wave's
>> partial values and enter more values.
>> http://www.csounds.com/ezine/spectra/
>> and gen10's manual entry:
>> http://www.csounds.com/manualOLPC/GEN10.html
>>
>
> Ok so then I call gen10 for every note that's played (make a big new table
> for each note) to make the harmonics from the note frequency up till the
> nyquist and then use for instance poscil3 to play the note?
> Just to be sure I got that right before I go figure out how to do that (I'm
> very much a csound programming newbie)
>
>
>
>>
>> Or just draw a sawtooth wave with straight lines:
>> http://www.csounds.com/manualOLPC/GEN07.html
>>
>
> That will give me a lot of aliasing. Can't have that for my use.
>
>
>>
>>
>>
>> Those are the two most-obvious ones.
>>
>> Greg
>>
>>
>>
>> Use however many partials and adjust the size of the table to whatever
>> definition of "quality" you'd like.
>> That's the most precise way I know to make an audio-rate sawtooth wave.
>>
>> Greg
>>
>
>
> Still wondering if the method above will give a better audio quality than
> VCO2.
> Do you know why or in which way VCO2 gives inferior results?
> VCO2 would be way simpler but if it's lacking in quality then I'll do it the
> other way..
>
> -Marcel
>
> 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"
>


Date2010-09-27 07:31
FromGreg Schroeder
Subject[Csnd] Re: Re: Re: Re: What's the highest quality sawtooth in Csound?
Listen to Mr. Simpson, I suspect he does this for a living.
Could someone direct me to a discussion of exactly how vco/vco2 works?
Just on principle, I try to stick with opcodes where I can figure out
their guts.

Greg

On Mon, Sep 27, 2010 at 1:29 PM, Corbin Simpson
 wrote:
> vco2 has been perfectly acceptable for me. I don't believe that a
> hand-rolled ioscil is any better, based on how the vco family is
> implemented.
>
> Sending from a mobile, pardon the brevity. ~ C.
>
> On Sep 26, 2010 9:23 PM, "Marcel de Velde"  wrote:
>> Hi Greg,
>>
>> Thanks for your help!
>>
>>
>> There's a few approaches.
>>> Additive:
>>> Go down to the yellow table. Express those values in the ftable as
>>> decimals. If you'd like, observe the pattern for the sawtooth wave's
>>> partial values and enter more values.
>>> http://www.csounds.com/ezine/spectra/
>>> and gen10's manual entry:
>>> http://www.csounds.com/manualOLPC/GEN10.html
>>>
>>
>> Ok so then I call gen10 for every note that's played (make a big new table
>> for each note) to make the harmonics from the note frequency up till the
>> nyquist and then use for instance poscil3 to play the note?
>> Just to be sure I got that right before I go figure out how to do that
>> (I'm
>> very much a csound programming newbie)
>>
>>
>>
>>>
>>> Or just draw a sawtooth wave with straight lines:
>>> http://www.csounds.com/manualOLPC/GEN07.html
>>>
>>
>> That will give me a lot of aliasing. Can't have that for my use.
>>
>>
>>>
>>>
>>>
>>> Those are the two most-obvious ones.
>>>
>>> Greg
>>>
>>>
>>>
>>> Use however many partials and adjust the size of the table to whatever
>>> definition of "quality" you'd like.
>>> That's the most precise way I know to make an audio-rate sawtooth wave.
>>>
>>> Greg
>>>
>>
>>
>> Still wondering if the method above will give a better audio quality than
>> VCO2.
>> Do you know why or in which way VCO2 gives inferior results?
>> VCO2 would be way simpler but if it's lacking in quality then I'll do it
>> the
>> other way..
>>
>> -Marcel
>>
>> 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
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Date2010-09-27 10:26
FromCorbin Simpson
Subject[Csnd] Re: Re: Re: Re: Re: What's the highest quality sawtooth in Csound?
I should point out that "does this for a living" only pertains to
graphics drivers, not sound systems. I don't really get paid for my
music either. :3

The vco opcodes work by integrating impulses. Googling "band limited
impulse train" should bring up a decent explanation. (At least, that's
how I learned about it.)

vco and vco2 both do very nice-sounding things. As the manual states,
vco2 precalculates the needed tables. If you're doing real-time stuff
and don't mind a bit of extra memory usage, vco2 works far better.

~ C.

On Sun, Sep 26, 2010 at 11:31 PM, Greg Schroeder  wrote:
> Listen to Mr. Simpson, I suspect he does this for a living.
> Could someone direct me to a discussion of exactly how vco/vco2 works?
> Just on principle, I try to stick with opcodes where I can figure out
> their guts.
>
> Greg
>
> On Mon, Sep 27, 2010 at 1:29 PM, Corbin Simpson
>  wrote:
>> vco2 has been perfectly acceptable for me. I don't believe that a
>> hand-rolled ioscil is any better, based on how the vco family is
>> implemented.
>>
>> Sending from a mobile, pardon the brevity. ~ C.
>>
>> On Sep 26, 2010 9:23 PM, "Marcel de Velde"  wrote:
>>> Hi Greg,
>>>
>>> Thanks for your help!
>>>
>>>
>>> There's a few approaches.
>>>> Additive:
>>>> Go down to the yellow table. Express those values in the ftable as
>>>> decimals. If you'd like, observe the pattern for the sawtooth wave's
>>>> partial values and enter more values.
>>>> http://www.csounds.com/ezine/spectra/
>>>> and gen10's manual entry:
>>>> http://www.csounds.com/manualOLPC/GEN10.html
>>>>
>>>
>>> Ok so then I call gen10 for every note that's played (make a big new table
>>> for each note) to make the harmonics from the note frequency up till the
>>> nyquist and then use for instance poscil3 to play the note?
>>> Just to be sure I got that right before I go figure out how to do that
>>> (I'm
>>> very much a csound programming newbie)
>>>
>>>
>>>
>>>>
>>>> Or just draw a sawtooth wave with straight lines:
>>>> http://www.csounds.com/manualOLPC/GEN07.html
>>>>
>>>
>>> That will give me a lot of aliasing. Can't have that for my use.
>>>
>>>
>>>>
>>>>
>>>>
>>>> Those are the two most-obvious ones.
>>>>
>>>> Greg
>>>>
>>>>
>>>>
>>>> Use however many partials and adjust the size of the table to whatever
>>>> definition of "quality" you'd like.
>>>> That's the most precise way I know to make an audio-rate sawtooth wave.
>>>>
>>>> Greg
>>>>
>>>
>>>
>>> Still wondering if the method above will give a better audio quality than
>>> VCO2.
>>> Do you know why or in which way VCO2 gives inferior results?
>>> VCO2 would be way simpler but if it's lacking in quality then I'll do it
>>> the
>>> other way..
>>>
>>> -Marcel
>>>
>>> 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"
>
>



-- 
When the facts change, I change my mind. What do you do, sir? ~ Keynes

Corbin Simpson



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
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Date2010-09-27 13:46
FromAndres Cabrera
Subject[Csnd] Re: Re: Re: Re: Re: Re: What's the highest quality sawtooth in Csound?
Yes, if you want sound quality, you should use a bandlimited
oscillator like vco2. Using a table with a straight line will produce
aliasing. QuteCsound includes an example showing exactly this, and you
can clearly hear the difference. However, for larger size tables with
cubic interpolation, the difference starts to become very small.

Cheers,
Andrés

On Mon, Sep 27, 2010 at 10:26 AM, Corbin Simpson
 wrote:
> I should point out that "does this for a living" only pertains to
> graphics drivers, not sound systems. I don't really get paid for my
> music either. :3
>
> The vco opcodes work by integrating impulses. Googling "band limited
> impulse train" should bring up a decent explanation. (At least, that's
> how I learned about it.)
>
> vco and vco2 both do very nice-sounding things. As the manual states,
> vco2 precalculates the needed tables. If you're doing real-time stuff
> and don't mind a bit of extra memory usage, vco2 works far better.
>
> ~ C.
>
> On Sun, Sep 26, 2010 at 11:31 PM, Greg Schroeder  wrote:
>> Listen to Mr. Simpson, I suspect he does this for a living.
>> Could someone direct me to a discussion of exactly how vco/vco2 works?
>> Just on principle, I try to stick with opcodes where I can figure out
>> their guts.
>>
>> Greg
>>
>> On Mon, Sep 27, 2010 at 1:29 PM, Corbin Simpson
>>  wrote:
>>> vco2 has been perfectly acceptable for me. I don't believe that a
>>> hand-rolled ioscil is any better, based on how the vco family is
>>> implemented.
>>>
>>> Sending from a mobile, pardon the brevity. ~ C.
>>>
>>> On Sep 26, 2010 9:23 PM, "Marcel de Velde"  wrote:
>>>> Hi Greg,
>>>>
>>>> Thanks for your help!
>>>>
>>>>
>>>> There's a few approaches.
>>>>> Additive:
>>>>> Go down to the yellow table. Express those values in the ftable as
>>>>> decimals. If you'd like, observe the pattern for the sawtooth wave's
>>>>> partial values and enter more values.
>>>>> http://www.csounds.com/ezine/spectra/
>>>>> and gen10's manual entry:
>>>>> http://www.csounds.com/manualOLPC/GEN10.html
>>>>>
>>>>
>>>> Ok so then I call gen10 for every note that's played (make a big new table
>>>> for each note) to make the harmonics from the note frequency up till the
>>>> nyquist and then use for instance poscil3 to play the note?
>>>> Just to be sure I got that right before I go figure out how to do that
>>>> (I'm
>>>> very much a csound programming newbie)
>>>>
>>>>
>>>>
>>>>>
>>>>> Or just draw a sawtooth wave with straight lines:
>>>>> http://www.csounds.com/manualOLPC/GEN07.html
>>>>>
>>>>
>>>> That will give me a lot of aliasing. Can't have that for my use.
>>>>
>>>>
>>>>>
>>>>>
>>>>>
>>>>> Those are the two most-obvious ones.
>>>>>
>>>>> Greg
>>>>>
>>>>>
>>>>>
>>>>> Use however many partials and adjust the size of the table to whatever
>>>>> definition of "quality" you'd like.
>>>>> That's the most precise way I know to make an audio-rate sawtooth wave.
>>>>>
>>>>> Greg
>>>>>
>>>>
>>>>
>>>> Still wondering if the method above will give a better audio quality than
>>>> VCO2.
>>>> Do you know why or in which way VCO2 gives inferior results?
>>>> VCO2 would be way simpler but if it's lacking in quality then I'll do it
>>>> the
>>>> other way..
>>>>
>>>> -Marcel
>>>>
>>>> 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"
>>
>>
>
>
>
> --
> When the facts change, I change my mind. What do you do, sir? ~ Keynes
>
> Corbin Simpson
> 
>
>
> 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"
>
>



-- 


Andrés


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
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Date2010-09-28 00:37
FromGreg Schroeder
Subject[Csnd] Re: Re: Re: Re: Re: Re: Re: What's the highest quality sawtooth in Csound?
Thank you everyone!
Is this: http://cnx.org/content/m15457/latest/
the explanation I'm looking for?

"The band-limited pulse, however, is free of aliasing problems because
its maximum harmonic can be chosen to be below the folding frequency."

Greg

On Mon, Sep 27, 2010 at 9:46 PM, Andres Cabrera  wrote:
> Yes, if you want sound quality, you should use a bandlimited
> oscillator like vco2. Using a table with a straight line will produce
> aliasing. QuteCsound includes an example showing exactly this, and you
> can clearly hear the difference. However, for larger size tables with
> cubic interpolation, the difference starts to become very small.
>
> Cheers,
> Andrés
>
> On Mon, Sep 27, 2010 at 10:26 AM, Corbin Simpson
>  wrote:
>> I should point out that "does this for a living" only pertains to
>> graphics drivers, not sound systems. I don't really get paid for my
>> music either. :3
>>
>> The vco opcodes work by integrating impulses. Googling "band limited
>> impulse train" should bring up a decent explanation. (At least, that's
>> how I learned about it.)
>>
>> vco and vco2 both do very nice-sounding things. As the manual states,
>> vco2 precalculates the needed tables. If you're doing real-time stuff
>> and don't mind a bit of extra memory usage, vco2 works far better.
>>
>> ~ C.
>>
>> On Sun, Sep 26, 2010 at 11:31 PM, Greg Schroeder  wrote:
>>> Listen to Mr. Simpson, I suspect he does this for a living.
>>> Could someone direct me to a discussion of exactly how vco/vco2 works?
>>> Just on principle, I try to stick with opcodes where I can figure out
>>> their guts.
>>>
>>> Greg
>>>
>>> On Mon, Sep 27, 2010 at 1:29 PM, Corbin Simpson
>>>  wrote:
>>>> vco2 has been perfectly acceptable for me. I don't believe that a
>>>> hand-rolled ioscil is any better, based on how the vco family is
>>>> implemented.
>>>>
>>>> Sending from a mobile, pardon the brevity. ~ C.
>>>>
>>>> On Sep 26, 2010 9:23 PM, "Marcel de Velde"  wrote:
>>>>> Hi Greg,
>>>>>
>>>>> Thanks for your help!
>>>>>
>>>>>
>>>>> There's a few approaches.
>>>>>> Additive:
>>>>>> Go down to the yellow table. Express those values in the ftable as
>>>>>> decimals. If you'd like, observe the pattern for the sawtooth wave's
>>>>>> partial values and enter more values.
>>>>>> http://www.csounds.com/ezine/spectra/
>>>>>> and gen10's manual entry:
>>>>>> http://www.csounds.com/manualOLPC/GEN10.html
>>>>>>
>>>>>
>>>>> Ok so then I call gen10 for every note that's played (make a big new table
>>>>> for each note) to make the harmonics from the note frequency up till the
>>>>> nyquist and then use for instance poscil3 to play the note?
>>>>> Just to be sure I got that right before I go figure out how to do that
>>>>> (I'm
>>>>> very much a csound programming newbie)
>>>>>
>>>>>
>>>>>
>>>>>>
>>>>>> Or just draw a sawtooth wave with straight lines:
>>>>>> http://www.csounds.com/manualOLPC/GEN07.html
>>>>>>
>>>>>
>>>>> That will give me a lot of aliasing. Can't have that for my use.
>>>>>
>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> Those are the two most-obvious ones.
>>>>>>
>>>>>> Greg
>>>>>>
>>>>>>
>>>>>>
>>>>>> Use however many partials and adjust the size of the table to whatever
>>>>>> definition of "quality" you'd like.
>>>>>> That's the most precise way I know to make an audio-rate sawtooth wave.
>>>>>>
>>>>>> Greg
>>>>>>
>>>>>
>>>>>
>>>>> Still wondering if the method above will give a better audio quality than
>>>>> VCO2.
>>>>> Do you know why or in which way VCO2 gives inferior results?
>>>>> VCO2 would be way simpler but if it's lacking in quality then I'll do it
>>>>> the
>>>>> other way..
>>>>>
>>>>> -Marcel
>>>>>
>>>>> 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"
>>>
>>>
>>
>>
>>
>> --
>> When the facts change, I change my mind. What do you do, sir? ~ Keynes
>>
>> Corbin Simpson
>> 
>>
>>
>> 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"
>>
>>
>
>
>
> --
>
>
> Andrés
>
>
> 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"


Date2010-09-28 09:43
FromAndres Cabrera
Subject[Csnd] Re: Re: Re: Re: Re: Re: Re: Re: What's the highest quality sawtooth in Csound?
Hi,

Yes. That kind of bandlimiting. There are several ways to do band
limited oscillators, including Victor's somewhat recent FM techniques
he talks about in a recent Csound journal article.

Cheers,
Andres

On Tue, Sep 28, 2010 at 12:37 AM, Greg Schroeder  wrote:
> Thank you everyone!
> Is this: http://cnx.org/content/m15457/latest/
> the explanation I'm looking for?
>
> "The band-limited pulse, however, is free of aliasing problems because
> its maximum harmonic can be chosen to be below the folding frequency."
>
> Greg
>
> On Mon, Sep 27, 2010 at 9:46 PM, Andres Cabrera  wrote:
>> Yes, if you want sound quality, you should use a bandlimited
>> oscillator like vco2. Using a table with a straight line will produce
>> aliasing. QuteCsound includes an example showing exactly this, and you
>> can clearly hear the difference. However, for larger size tables with
>> cubic interpolation, the difference starts to become very small.
>>
>> Cheers,
>> Andrés
>>
>> On Mon, Sep 27, 2010 at 10:26 AM, Corbin Simpson
>>  wrote:
>>> I should point out that "does this for a living" only pertains to
>>> graphics drivers, not sound systems. I don't really get paid for my
>>> music either. :3
>>>
>>> The vco opcodes work by integrating impulses. Googling "band limited
>>> impulse train" should bring up a decent explanation. (At least, that's
>>> how I learned about it.)
>>>
>>> vco and vco2 both do very nice-sounding things. As the manual states,
>>> vco2 precalculates the needed tables. If you're doing real-time stuff
>>> and don't mind a bit of extra memory usage, vco2 works far better.
>>>
>>> ~ C.
>>>
>>> On Sun, Sep 26, 2010 at 11:31 PM, Greg Schroeder  wrote:
>>>> Listen to Mr. Simpson, I suspect he does this for a living.
>>>> Could someone direct me to a discussion of exactly how vco/vco2 works?
>>>> Just on principle, I try to stick with opcodes where I can figure out
>>>> their guts.
>>>>
>>>> Greg
>>>>
>>>> On Mon, Sep 27, 2010 at 1:29 PM, Corbin Simpson
>>>>  wrote:
>>>>> vco2 has been perfectly acceptable for me. I don't believe that a
>>>>> hand-rolled ioscil is any better, based on how the vco family is
>>>>> implemented.
>>>>>
>>>>> Sending from a mobile, pardon the brevity. ~ C.
>>>>>
>>>>> On Sep 26, 2010 9:23 PM, "Marcel de Velde"  wrote:
>>>>>> Hi Greg,
>>>>>>
>>>>>> Thanks for your help!
>>>>>>
>>>>>>
>>>>>> There's a few approaches.
>>>>>>> Additive:
>>>>>>> Go down to the yellow table. Express those values in the ftable as
>>>>>>> decimals. If you'd like, observe the pattern for the sawtooth wave's
>>>>>>> partial values and enter more values.
>>>>>>> http://www.csounds.com/ezine/spectra/
>>>>>>> and gen10's manual entry:
>>>>>>> http://www.csounds.com/manualOLPC/GEN10.html
>>>>>>>
>>>>>>
>>>>>> Ok so then I call gen10 for every note that's played (make a big new table
>>>>>> for each note) to make the harmonics from the note frequency up till the
>>>>>> nyquist and then use for instance poscil3 to play the note?
>>>>>> Just to be sure I got that right before I go figure out how to do that
>>>>>> (I'm
>>>>>> very much a csound programming newbie)
>>>>>>
>>>>>>
>>>>>>
>>>>>>>
>>>>>>> Or just draw a sawtooth wave with straight lines:
>>>>>>> http://www.csounds.com/manualOLPC/GEN07.html
>>>>>>>
>>>>>>
>>>>>> That will give me a lot of aliasing. Can't have that for my use.
>>>>>>
>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Those are the two most-obvious ones.
>>>>>>>
>>>>>>> Greg
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Use however many partials and adjust the size of the table to whatever
>>>>>>> definition of "quality" you'd like.
>>>>>>> That's the most precise way I know to make an audio-rate sawtooth wave.
>>>>>>>
>>>>>>> Greg
>>>>>>>
>>>>>>
>>>>>>
>>>>>> Still wondering if the method above will give a better audio quality than
>>>>>> VCO2.
>>>>>> Do you know why or in which way VCO2 gives inferior results?
>>>>>> VCO2 would be way simpler but if it's lacking in quality then I'll do it
>>>>>> the
>>>>>> other way..
>>>>>>
>>>>>> -Marcel
>>>>>>
>>>>>> 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"
>>>>
>>>>
>>>
>>>
>>>
>>> --
>>> When the facts change, I change my mind. What do you do, sir? ~ Keynes
>>>
>>> Corbin Simpson
>>> 
>>>
>>>
>>> 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"
>>>
>>>
>>
>>
>>
>> --
>>
>>
>> Andrés
>>
>>
>> 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"
>
>



-- 


Andrés


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