[chuck-users] help understanding lisa

[dan trueman]

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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