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Re: Missing information in the Web Audio spec

From: Robert O'Callahan <robert@ocallahan.org>
Date: Thu, 17 May 2012 10:37:57 +1200
Message-ID: <CAOp6jLb306Ntfq7cs_1atDzYpPrfUujT8zqn_N1dvgfbAecO3A@mail.gmail.com>
To: Chris Rogers <crogers@google.com>
Cc: Philip Jägenstedt <philipj@opera.com>, public-audio@w3.org
On Thu, May 17, 2012 at 10:01 AM, Chris Rogers <crogers@google.com> wrote:

> On Wed, May 16, 2012 at 2:55 PM, Robert O'Callahan <robert@ocallahan.org>wrote:
>
>> On Thu, May 17, 2012 at 9:46 AM, Robert O'Callahan <robert@ocallahan.org>wrote:
>>
>>> Ah, thanks, I should have remembered that. Then resolving ISSUE-24 will
>>> require specification of a processing model that handles cycles. I would
>>> like resolving that to be quite high priority as it will have significant
>>> impact on the architecture of any implementation.
>>>
>>
>> [Two things I'm particularly curious about: how to handle cycles that
>> don't contain a DelayNode
>>
>
> In signal processing terms this is undefined or non-sensical.
>

Sure, but authors can still do it, so something needs to be defined.


>
>> , and how to handle a cycle containing a DelayNode with very small
>> delayTime, e.g. a single sample.]
>>
>
> This is well defined in signal processing.  In fact many common filters
> (IIR filters such as the biquad) are implemented this way.
>

I understand that that is well defined. Very small delays do impose
significant implementation constraints, however.

Rob
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Received on Wednesday, 16 May 2012 22:38:27 GMT

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