[chuck-users] help understanding lisa

dan trueman dtrueman at Princeton.EDU
Wed Nov 5 20:04:42 EST 2008


i don't think i got it committed...

dan

On Nov 5, 2008, at 7:51 PM, eduard aylon wrote:

> Hi Dan, do you mean It didn't get committed or that it just wasn't  
> included in the release. If the latter, then I'll check out the cvs.
>
> eduard
>
> On Nov 6, 2008, at 1:40 AM, dan trueman wrote:
>
>> yeah, i think i found and fixed this bug a while ago also, but  
>> again i don't think it got checked in.... apologies!
>>
>> dt
>>
>> On Nov 5, 2008, at 7:33 PM, eduard wrote:
>>
>>> Ok, got the answer:
>>>
>>> lisa.valueAt(Math.sin(2.0*pi*60*i/(size-1)), i::samp);
>>>
>>> should be put into lisa and not
>>>
>>> lisa.valueAt(Math.sin(2.0*pi*60*i/size), i::samp);
>>>
>>> the difference is in using size or size-1. This seems not right  
>>> though...
>>>
>>> eduard
>>>
>>>
>>> Begin forwarded message:
>>>
>>>> From: eduard aylon <eduard.aylon at gmail.com>
>>>> Date: November 6, 2008 1:20:56 AM GMT+01:00
>>>> To: ChucK Users Mailing List <chuck-users at lists.cs.princeton.edu>
>>>> Subject: help understanding lisa
>>>>
>>>> Hello list,
>>>>
>>>> I am trying to build a granular patch with lisa, but for some  
>>>> reason I am getting clicks every time lisa repeats the buffer.  
>>>> Maybe it has to do with lisa's duration? Hope someone can  
>>>> explain me what I am doing wrong. Following I attach two  
>>>> examples one uses lisa the other uses an array. The one that  
>>>> runs with lisa has clicks, the other sounds pristine, why? (even  
>>>> if rampup and rampdown were set for lisa). The strange thing is  
>>>> that if recorded to file and checked with an audio editor I  
>>>> can't see any strange artifacts in the waveform.
>>>>
>>>> thanks for any help,
>>>>
>>>> eduard
>>>>
>>>> // the patch that uses lisa:
>>>>
>>>> LiSa lisa => dac;
>>>> 1024 => int size;
>>>> size::samp => lisa.duration;
>>>>
>>>> for (int i; i < size; i++)
>>>> {
>>>> lisa.valueAt(Math.sin(2.0*pi*60*i/size), i::samp);
>>>> }
>>>>
>>>> 1 => lisa.play;
>>>> while(true)
>>>> {
>>>> lisa.rampUp(10::samp);
>>>> lisa.duration() - 20::samp => now;
>>>> lisa.rampDown(10::samp);
>>>> }
>>>>
>>>>
>>>>
>>>> // the other patch with a simple buffer:
>>>>
>>>> Impulse imp => dac;
>>>> 1024 => int size;
>>>> float buffer[size];
>>>> size - 1 => int bitmask;
>>>>
>>>> for (int i; i < size; i++)
>>>> {
>>>> Math.sin(2.0*pi*60*i/size) => buffer[i];
>>>> }
>>>>
>>>> 0 => int pos;
>>>>
>>>> while(true)
>>>> {
>>>> buffer[pos&bitmask] => imp.next;
>>>> pos++;
>>>> 1::samp => now;
>>>> }
>>>>
>>>
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