[Stk] Pops and Crackling on Windows

[Ted Stockwell]

Thanks very much for the hints, I will try all of them.
Actually, I did see a couple of messages about exceeding +/- 1.0....



>________________________________
> From: Perry Cook <prc at CS.Princeton.EDU>
>To: Ted Stockwell <emorning at yahoo.com> 
>Cc: "stk at ccrma.stanford.edu" <stk at ccrma.Stanford.EDU> 
>Sent: Friday, August 30, 2013 5:41 PM
>Subject: Re: [Stk] Pops and Crackling on Windows
> 
>
>Hey Ted,
>
>I'm doing some STK on RPi already!  It works quite well if you
>pay attention to how much computation you're asking for at
>any given time.
>
>Since it happens the same way at the same instant, it could
>be clipping for some reason.  The CPU spiking might be 
>something inside STK checking for exceeding of +/- 1.0.
>
>I'd try changing the gain (downward) just a bit.  This could 
>be done in a variety of places, including right in the main 
>program.  Find a nice place where the Instrument.tick() method
>is being called, and multiply that times your test gain hack.
>
>Something like:  dac.tick(myRev.tick(0.5*myInstrument.tick())));
>where you add in that 0.5.  
>
>Another thing to try would be to run the demo with the GUI
>and see if things click any.  Wish I could help more.  
>
>PRC
>
>On Aug 30, 2013, at 2:59 PM, Ted Stockwell wrote:
>
>> Hi All,
>> 
>> I'm a programmer that is totally new to sound synthesis and STK.
>> I've built the demo project on Windows XP, I'm playing with it, and I have some questions... 
>> 
>> When I play a SKINI file in realtime I hear a lot of pops and crackling/buzzes at specific times in the sequence (demo Clarinet -or -if scores/bookert.ski).
>> The pops and crackling always happens at the same points in the sequence.
>> I've noticed that my CPU usage tops out when the crackling starts (BTW, I have 3.4 Ghz Pentium 4 CPU).
>> If I generate a .wav file instead and play the .wav file then I don't hear any crackling (demo Clarinet -if scores/bookert.ski -ow clarinet.wav) .
>> I figure the issue must be related to the realtime synthesis of the sound (but I suppose it could be the actual playing of the sound).
>> 
>> I've tried increasing RT_BUFFER_SIZE from 512 to 4096 but that made no difference.
>> Can anybody suggest a remedy?
>> My ultimate goal is too use STK on a Raspberry Pi so I'll need to understand/solve this issue in order to be comfortable moving forward.
>> 
>> Thanks in advance,
>> 
>> -ted stockwell
>> 
>> 
>> PS: I've ordered a copy of Real Sound Synthesis for Interactive Applications but I haven't received it yet, so I don't understand how any of this stuff works :-).
>> 
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>
>
>
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