[chuck-users] help understanding lisa

[eduard aylon]

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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