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+---
+title: AnalyserNode
+slug: Web/API/AnalyserNode
+translation_of: Web/API/AnalyserNode
+---
+{{APIRef("Web Audio API")}}
+
+La interfaz **`AnalyserNode`** representa un nodo habilitado para proveer frecuencia en tiempo real y analisis de tiempo-dominio. Es un {{domxref("AudioNode")}} que pasa el flujo de audio sin modificación desde el origen de entrada a la salida, pero, te permite obtener los datos generados, procesarlos, y crear visualizaciones de audio.
+
+Un `AnalyzerNode` tiene exactamente una entrada y una salida. El nodo trabaja incluso si la salida no se encuentra conectada.
+
+![Without modifying the audio stream, the node allows to get the frequency and time-domain data associated to it, using a FFT.](https://mdn.mozillademos.org/files/9707/WebAudioFFT.png)
+
+<table class="properties">
+  <tbody>
+    <tr>
+      <th scope="row"><dfn>Numero de entradas</dfn></th>
+      <td><code>1</code></td>
+    </tr>
+    <tr>
+      <th scope="row"><dfn>Numero de salidas</dfn></th>
+      <td><code>1</code> (puede estar desconectada)</td>
+    </tr>
+    <tr>
+      <th scope="row"><dfn>Modo de conteo de canal</dfn></th>
+      <td><code>"explicit"</code></td>
+    </tr>
+    <tr>
+      <th scope="row"><dfn>Conteo de cana</dfn></th>
+      <td><code>1</code></td>
+    </tr>
+    <tr>
+      <th scope="row"><dfn>Interpretación de canal</dfn></th>
+      <td><code>"speakers"</code></td>
+    </tr>
+  </tbody>
+</table>
+
+## Herencia
+
+Esta interfaz hereda de las siguientes interfaces padre:
+
+{{InheritanceDiagram}}
+
+## Propiedades
+
+_Inherits properties from its parent,_ _{{domxref("AudioNode")}}_.
+
+- {{domxref("AnalyserNode.fftSize")}}
+  - : Is an unsigned long value representing the size of the FFT ([Fast Fourier Transform](http://en.wikipedia.org/wiki/Fast_Fourier_transform)) to be used to determine the frequency domain.
+- {{domxref("AnalyserNode.frequencyBinCount")}} {{readonlyInline}}
+  - : Is an unsigned long value half that of the FFT size. This generally equates to the number of data values you will have to play with for the visualization.
+- {{domxref("AnalyserNode.minDecibels")}}
+  - : Is a double value representing the minimum power value in the scaling range for the FFT analysis data, for conversion to unsigned byte values — basically, this specifies the minimum value for the range of results when using `getByteFrequencyData()`.
+- {{domxref("AnalyserNode.maxDecibels")}}
+  - : Is a double value representing the maximum power value in the scaling range for the FFT analysis data, for conversion to unsigned byte values — basically, this specifies the maximum value for the range of results when using `getByteFrequencyData()`.
+- {{domxref("AnalyserNode.smoothingTimeConstant")}}
+  - : Is a double value representing the averaging constant with the last analysis frame — basically, it makes the transition between values over time smoother.
+
+## Methods
+
+_Inherits methods from its parent,_ _{{domxref("AudioNode")}}_.
+
+- {{domxref("AnalyserNode.getFloatFrequencyData()")}}
+  - : Copies the current frequency data into a {{domxref("Float32Array")}} array passed into it.
+
+<!---->
+
+- {{domxref("AnalyserNode.getByteFrequencyData()")}}
+  - : Copies the current frequency data into a {{domxref("Uint8Array")}} (unsigned byte array) passed into it.
+
+<!---->
+
+- {{domxref("AnalyserNode.getFloatTimeDomainData()")}}
+  - : Copies the current waveform, or time-domain, data into a {{domxref("Float32Array")}} array passed into it.
+- {{domxref("AnalyserNode.getByteTimeDomainData()")}}
+  - : Copies the current waveform, or time-domain, data into a {{domxref("Uint8Array")}} (unsigned byte array) passed into it.
+
+## Examples
+
+> **Nota:** See the guide [Visualizations with Web Audio API](/es/docs/Web/API/Web_Audio_API/Visualizations_with_Web_Audio_API) for more information on creating audio visualizations.
+
+### Basic usage
+
+The following example shows basic usage of an {{domxref("AudioContext")}} to create an `AnalyserNode`, then {{domxref("window.requestAnimationFrame()","requestAnimationFrame")}} and {{htmlelement("canvas")}} to collect time domain data repeatedly and draw an "oscilloscope style" output of the current audio input. For more complete applied examples/information, check out our [Voice-change-O-matic](http://mdn.github.io/voice-change-o-matic/) demo (see [app.js lines 128–205](https://github.com/mdn/voice-change-o-matic/blob/gh-pages/scripts/app.js#L128-L205) for relevant code).
+
+```js
+var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
+var analyser = audioCtx.createAnalyser();
+
+  ...
+
+analyser.fftSize = 2048;
+var bufferLength = analyser.frequencyBinCount;
+var dataArray = new Uint8Array(bufferLength);
+analyser.getByteTimeDomainData(dataArray);
+
+// draw an oscilloscope of the current audio source
+
+function draw() {
+
+      drawVisual = requestAnimationFrame(draw);
+
+      analyser.getByteTimeDomainData(dataArray);
+
+      canvasCtx.fillStyle = 'rgb(200, 200, 200)';
+      canvasCtx.fillRect(0, 0, WIDTH, HEIGHT);
+
+      canvasCtx.lineWidth = 2;
+      canvasCtx.strokeStyle = 'rgb(0, 0, 0)';
+
+      canvasCtx.beginPath();
+
+      var sliceWidth = WIDTH * 1.0 / bufferLength;
+      var x = 0;
+
+      for(var i = 0; i < bufferLength; i++) {
+
+        var v = dataArray[i] / 128.0;
+        var y = v * HEIGHT/2;
+
+        if(i === 0) {
+          canvasCtx.moveTo(x, y);
+        } else {
+          canvasCtx.lineTo(x, y);
+        }
+
+        x += sliceWidth;
+      }
+
+      canvasCtx.lineTo(canvas.width, canvas.height/2);
+      canvasCtx.stroke();
+    };
+
+    draw();
+```
+
+## Specifications
+
+| Specification                                                                                        | Status                               | Comment |
+| ---------------------------------------------------------------------------------------------------- | ------------------------------------ | ------- |
+| {{SpecName('Web Audio API', '#the-analysernode-interface', 'AnalyserNode')}} | {{Spec2('Web Audio API')}} |         |
+
+## Browser compatibility
+
+{{Compat("api.AnalyserNode")}}
+
+## See also
+
+- [Using the Web Audio API](/es/docs/Web_Audio_API/Using_Web_Audio_API)