Re: Interpolation on WaveShaperNode?

On Mon, May 13, 2013 at 3:09 PM, Chris Rogers <crogers@google.com> wrote:

>
>
>
> On Mon, May 13, 2013 at 11:32 AM, Ehsan Akhgari <ehsan.akhgari@gmail.com>wrote:
>
>> FWIW, in Gecko, I'm implementing linear interpolation by default.
>>
>
> Good, I think that's what we should do for the default, but we could
> consider an attribute "linear" or "nearest-neighbor" to select the
> interpolation method.  On the other hand, it's pretty easy to create the
> "bit-crushing" effects even with linear interpolation as long as the table
> size is suitably large, so maybe all we need is linear.
>
> WebKit/Blink are not doing the linear interpolation, so that'll have to
> change.
>

Sounds good.  Can you please spec this as well?


> By the way, I've been looking in some detail about how to implement a
> "high-quality" mode for the shaper, which up-samples the signal to a higher
> sample-rate (2x, in the simple case), does the shaping, then down-samples
> back down to the node sample-rate.  This type of processing is important
> for guitar amp simulation and other simulation of analog gear to avoid the
> harsh aliasing.  I think the default mode of operation for the shaper
> should not do this up-sampling, but that it would be good to opt-in by
> having a .quality attribute.
>

Are you planning to add the quality attribute right now, or wait for a
"post-v1" spec?

--
Ehsan
<http://ehsanakhgari.org/>