Hi,

There seems to be a bug with pvshift. When I modify a signal with it, 
the amplitude becomes a lot smaller, and even after applying a gain it 
sounds completely different from the original signal, even if the 
frequency shift is very small or even zero.

(This is with the doubles version of CSound 5.13 on Windows XP)

Here is a csd that shows the problem (I first found this problem with a 
sampled file, but a sawtooth shows the problem just as well):




sr=44100
ksmps=1
nchnls=2

    instr 1
kenv linen 10000, 0.1, p3, 0.1
asig vco2 kenv, 200
fsig pvsanal asig, 1024,256,2048,0
fsigo  pvshift    fsig, 0.1, 100
aout pvsynth fsigo
aout = aout*2000
outs aout, aout
;outs asig, asig
    endin



i1 0 1
e

Mark,

I've only realised now that this bug has been reported and fixed in  
GIT. The problem is that pvshift gain gets initialised to 0, so
to fix it (for now, before next release), just set it to 1, e.g.

fs1 pvshift  fsin, 0.1,100,0,1

(if you want more details, you'll find it in the list archives)

Victor


On 23 May 2011, at 22:50, Mark Van Peteghem wrote:

> Hi,
>
> There seems to be a bug with pvshift. When I modify a signal with  
> it, the amplitude becomes a lot smaller, and even after applying a  
> gain it sounds completely different from the original signal, even  
> if the frequency shift is very small or even zero.
>
> (This is with the doubles version of CSound 5.13 on Windows XP)
>
> Here is a csd that shows the problem (I first found this problem  
> with a sampled file, but a sawtooth shows the problem just as well):
>
> 
>
> 
> sr=44100
> ksmps=1
> nchnls=2
>
>   instr 1
> kenv linen 10000, 0.1, p3, 0.1
> asig vco2 kenv, 200
> fsig pvsanal asig, 1024,256,2048,0
> fsigo  pvshift    fsig, 0.1, 100
> aout pvsynth fsigo
> aout = aout*2000
> outs aout, aout
> ;outs asig, asig
>   endin
> 
>
> 
> i1 0 1
> e
> 
> 
>
>
> -- 
> Mark
> _________________________________________
> When you get lemons, you make lemonade.
> When you get hardware, you make software.
>
>
>
> 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"
>

Dr Victor Lazzarini
Senior Lecturer
Dept. of Music
NUI Maynooth Ireland
tel.: +353 1 708 3545
Victor dot Lazzarini AT nuim dot ie





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"

That works fine, thanks!

Victor Lazzarini wrote:
> Mark,
>
> I've only realised now that this bug has been reported and fixed in 
> GIT. The problem is that pvshift gain gets initialised to 0, so
> to fix it (for now, before next release), just set it to 1, e.g.
>
> fs1 pvshift  fsin, 0.1,100,0,1
>
> (if you want more details, you'll find it in the list archives)
>
> Victor
>
>
> On 23 May 2011, at 22:50, Mark Van Peteghem wrote:
>
>> Hi,
>>
>> There seems to be a bug with pvshift. When I modify a signal with it, 
>> the amplitude becomes a lot smaller, and even after applying a gain 
>> it sounds completely different from the original signal, even if the 
>> frequency shift is very small or even zero.
>>
>> (This is with the doubles version of CSound 5.13 on Windows XP)
>>
>> Here is a csd that shows the problem (I first found this problem with 
>> a sampled file, but a sawtooth shows the problem just as well):
>>
>> 
>>
>> 
>> sr=44100
>> ksmps=1
>> nchnls=2
>>
>>   instr 1
>> kenv linen 10000, 0.1, p3, 0.1
>> asig vco2 kenv, 200
>> fsig pvsanal asig, 1024,256,2048,0
>> fsigo  pvshift    fsig, 0.1, 100
>> aout pvsynth fsigo
>> aout = aout*2000
>> outs aout, aout
>> ;outs asig, asig
>>   endin
>> 
>>
>> 
>> i1 0 1
>> e
>> 
>> 
>>
>>
>> -- 
>> Mark
>> _________________________________________
>> When you get lemons, you make lemonade.
>> When you get hardware, you make software.
>>
>>
>>
>> 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"
>>
>
> Dr Victor Lazzarini
> Senior Lecturer
> Dept. of Music
> NUI Maynooth Ireland
> tel.: +353 1 708 3545
> Victor dot Lazzarini AT nuim dot ie
>
>
>
>
>
> 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"
>
>