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[Bug 17366] (OscillatorTypes): Oscillator types are not defined

From: <bugzilla@jessica.w3.org>
Date: Mon, 02 Sep 2013 07:40:27 +0000
To: public-audio@w3.org
Message-ID: <bug-17366-5429-uXecWqQjoT@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=17366

Marcus Geelnard (Opera) <mage@opera.com> changed:

           What    |Removed                     |Added
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                 CC|                            |mage@opera.com

--- Comment #4 from Marcus Geelnard (Opera) <mage@opera.com> ---
Paul, I think that specifying the amplitude (i.e. time-domain signal) the way
you suggest requires that an implementation does not deal with frequency
folding.

An important point of the oscillator node is that it is capable of producing a
high quality signal without folding effects. For instance, this requires that
the signal is allowed to have ripples (for every wave type except the sine).

I agree that we need to specify:

- The phase of the signal (and it should be consistent between wave forms).
- The signal strength (RMS, or something else).

On the other hand, I'm not sure how to specify the actual time-domain amplitude
level. As I've mentioned before, there are a wide range of options for
implementing the signal generation logic.

One option could be to specify the signal amplitude as a continuous time signal
(i.e. with infinite sample rate), and then specify in what ways an
implementation is allowed to sample this continuous time signal.

Also, I think that we should decide whether or not it's OK for implementations
to use different signal generation methods (e.g. trade quality for
performance), or if all implementations must use a specific signal generation
method.

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Received on Monday, 2 September 2013 07:40:28 UTC

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