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Define oscillator phases for the predefined types. #270

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Define oscillator phases for the predefined types. #270

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cfead4d
Define oscillator phases for the predefined types.
Nov 8, 2013
70f46a8
Clean up according to review:
Dec 19, 2013
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Expand Up @@ -3629,7 +3629,7 @@ <h2 id="OscillatorNode">4.23. The OscillatorNode Interface</h2>

<p>
There are several practical approaches that an implementation may take to avoid this aliasing.
But regardless of approach, the <em>idealized</em> discrete-time digital audio signal is well defined mathematically.
But regardless of approach, the <a href="#oscillatorTypes-OscillatorNode"><em>idealized</em> discrete-time digital audio signal</a> is well defined mathematically.
The trade-off for the implementation is a matter of implementation cost (in terms of CPU usage) versus fidelity to
achieving this ideal.
</p>
Expand Down Expand Up @@ -3747,6 +3747,30 @@ <h3 id="methodsandparams-OscillatorNode">4.23.2. Methods and Parameters</h3>
</dl>
</div>

<div id="oscillatorTypes-OscillatorNode-section" class="section">
<h3 id="oscillatorTypes-OscillatorNode">4.23.3. Oscillator Types</h3>
The idealized mathematical waveforms for the various oscillator types are defined here. In summary,
all waveforms are defined mathematically to be an odd function with a positive slope at time
0. The actual waveforms produced by the oscillator may differ to prevent aliasing affects.
<div id="oscillatorSin-OscillatorNode-section" class="section">
<h4 id="oscillatorSin-OscillatorNode">4.23.3.1 "sine"</h3>
The waveform for sine oscillator is sin(t).
</div>
<div id="oscillatorSquare-OscillatorNode-section" class="section">
<h4 id="oscillatorSquare-OscillatorNode">4.23.3.2 "square"</h3>
The waveform for the square wave oscillator is 1 for 0&le; t &lt; &pi; and -1 for -&pi; &lt; t &lt; 0.
</div>
<div id="oscillatorSawtooth-OscillatorNode-section" class="section">
<h4 id="oscillatorSawTooth-OscillatorNode">4.23.3.2 "sawtooth"</h3>
The waveform for the sawtooth oscillator is the ramp t/&pi; for -&pi; &lt; t &le; &pi;.
</div>
<div id="oscillatorTriangle-OscillatorNode-section" class="section">
<h4 id="oscillatorTriangle-OscillatorNode">4.23.3.2 "triangle"</h3>
The waveform for the triangle oscillator is 2/&pi;*t for 0 &le; t &le; &pi;/2 and
1-2/&pi;*(t-&pi;/2) for &pi;/2 &lt; t &le; &pi;. This is extended to all t by using the fact
that the waveform is an odd function with period 2&pi;.
</div>
</div>

<div id="PeriodicWave-section" class="section">
<h2 id="PeriodicWave">4.24. The PeriodicWave Interface</h2>
Expand Down