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+---
+title: AudioContext.createOscillator()
+slug: Web/API/AudioContext/createOscillator
+translation_of: Web/API/BaseAudioContext/createOscillator
+---
+<p>{{ APIRef("Web Audio API") }}</p>
+
+<div>
+<p>{{ domxref("AudioContext") }}インターフェースの<code>createOscillator()</code>メソッドは、周期的な波形を発生源である{{ domxref("OscillatorNode") }}を生成します。これは基礎的な音源です。</p>
+</div>
+
+<h2 id="構文">構文</h2>
+
+<pre class="brush: js">var audioCtx = new AudioContext();
+var oscillator = audioCtx.createOscillator();</pre>
+
+<h3 id="Description" name="Description">戻り値</h3>
+
+<p>{{domxref("OscillatorNode")}}</p>
+
+<h2 id="Examples" name="Examples">例</h2>
+
+<p>次の例はオシレーターノードを生成する基礎的なAudioContextの使い方を示しています。例と情報の応用は、<a class="external external-icon" href="http://mdn.github.io/voice-change-o-matic/">Voice-change-O-maticデモ</a>(<a class="external external-icon" href="https://github.com/mdn/voice-change-o-matic/blob/gh-pages/scripts/app.js">ソースコード</a>)をチェックしてください。また、{{ domxref("OscillatorNode") }}にはより詳細な情報があります。</p>
+
+<pre class="brush: js">// webオーディオAPIコンテキストを生成する
+var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
+
+// オシレーターノードを生成する
+var oscillator = audioCtx.createOscillator();
+
+oscillator.type = 'square';
+oscillator.frequency.value = 3000; // 値はHz(ヘルツ)
+oscillator.start();</pre>
+
+<h2 id="仕様">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Specification</th>
+ <th scope="col">Status</th>
+ <th scope="col">Comment</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('Web Audio API', '#widl-AudioContext-createOscillator-OscillatorNode', 'createOscillator')}}</td>
+ <td>{{Spec2('Web Audio API')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="ブラウザ互換性">ブラウザ互換性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Chrome</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari (WebKit)</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{CompatChrome(10.0)}}{{property_prefix("webkit")}}</td>
+ <td>{{CompatGeckoDesktop(25.0)}} </td>
+ <td>{{CompatNo}}</td>
+ <td>15.0{{property_prefix("webkit")}}<br>
+ 22 (unprefixed)</td>
+ <td>6.0{{property_prefix("webkit")}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Android</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>Firefox OS</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ <th>Chrome for Android</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{CompatUnknown}}</td>
+ <td>26.0</td>
+ <td>1.2</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>{{CompatUnknown}}</td>
+ <td>33.0</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="参考">参考</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web_Audio_API/Using_Web_Audio_API">Using the Web Audio API</a></li>
+</ul>