Detecting Microphone Activity in Java

Connect GS1 - 13 in Java Detecting Microphone Activity
Detecting Microphone Activity
Java gs1 - 13 drawer in java
use java ean13 printer torender ean13+2 with java
You can detect microphone activity in several ways. Like the Camera interface, you can elect to be noti ed when signi cant audio activity starts and ends, and you can see the activity level (the overall volume) at any time. The Speex codec, available in Flash Player 10 and later, can even lter out nonvoice audio and notify you when the user is speaking.
Barcode writer on java
use java barcode integrated todeploy barcode with java
Overall Activity
Bar Code barcode library with java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
To determine the overall volume the microphone is currently detecting, use the activityLevel accessor. Complete silence is an activity value of 0, and peak volume registers a 100. Use the gain setting to make sure audio peaks don t get clipped over 100; Example 33-3 shows one approach. You can also be noti ed of microphone activity by subscribing to the ActivityEvent.ACTIVITY event. The activating Boolean property of the event object tells you if activity is beginning (true) or ending. Activity refers to a duration of noise of a certain volume. For example, in creating a chat or broadcast application, when no one is talking, bandwidth can be saved because there is no need to send data. This information can also be used for visual feedback so that users know they (or others) are silent.
Control ean13 data on c#.net
to use ean 13 and upc - 13 data, size, image with visual c#.net barcode sdk
Microphone de nes a read-only silenceLevel property that reports what the silence level of the microphone is. This can be set using setSilenceLevel(), which sets the minimum input level
Control ean 13 data with .net
to access ean13+5 and upc - 13 data, size, image with .net barcode sdk
that should be considered activity and (optionally) the duration of silence necessary before activity is considered over. Silence values correspond directly to activity values. After gain is calibrated appropriately, any noise quieter than silenceLevel is not considered audio activity. This method is similar in purpose to Camera.setMotionLevel(); both methods specify when the activity event is dispatched. However, these methods have a signi cantly different impact on publishing streams:
Ean13 integrating for .net
using barcode writer for visual studio .net control to generate, create european article number 13 image in visual studio .net applications.
Camera.setMotionLevel() is designed to detect motion and does not affect bandwidth
usage. Even if a video stream does not detect motion, video is still sent.
Control qr code jis x 0510 size on java
to paint qrcode and qrcode data, size, image with java barcode sdk
Part VII: Sound and Video
Control ean-13 supplement 2 data on java
to print ean13 and ean13 data, size, image with java barcode sdk
Microphone.setSilenceLevel() is designed to optimize bandwidth. When an audio
Control code128 data with java
to get code 128c and barcode 128 data, size, image with java barcode sdk
stream is considered silent, no audio data is sent. Instead, a single message is sent, indicating that silence has started.
Control ean128 size for java
to print ean / ucc - 13 and gs1-128 data, size, image with java barcode sdk
Voice Activity
Control datamatrix data on java
to generate data matrix barcode and data matrix 2d barcode data, size, image with java barcode sdk
The Speex codec can recognize characteristics of voice and use its own heuristics to determine activity. To use voice-based activity instead of levels-based activity, follow these steps:
Incoporate usd8 with java
use java code 11 maker toinsert usd-8 in java
1. Set the codec to SoundCodec.SPEEX. 2. Enable voice activity detection by setting enableVAD to true. 3. Set the silence level to 0 with setSilenceLevel(). This lets Speex do its job instead.
Code 128B creator on .net
use visual studio .net code 128 code set a integration toconnect barcode code 128 on .net
Version
Control ean / ucc - 14 data on .net c#
ean / ucc - 14 data with c#.net
FP10.1. Voice Activity Detection is available only in Flash Player 10.1 and later.
Barcode integrated for microsoft excel
use office excel barcode integrating topaint barcode on office excel
Capturing and Analyzing Microphone Data
Deploy ean-13 on c#.net
using barcode implementation for asp.net aspx crystal control to generate, create ean13 image in asp.net aspx crystal applications.
With Flash Player 10.1 and later, you can get raw audio samples from the Microphone. Voice recognition is an obvious application; Didier Brun of http://bytearray.org was rst out of the gate to develop such an application. See his original post at http://bit.ly/bytearray-voice-gesture. Capturing audio from a Microphone is similar to dynamically sending audio to a Sound object. Simply subscribe to the Microphone s SampleDataEvent.SAMPLE_DATA event. The audio data is stored as a sequence of samples, each with a oating-point amplitude between 1 and 1. If you want frequencies instead, you have to do the Fourier transform yourself unless you want to mute all other sounds, set up a loopback, and use the SoundMixer s computeSpectrum() method. See 31 for more information about sound data. Example 33-4 draws the audio data to the screen in the simplest way possible.
Control gs1 - 12 data for office excel
to get gs1 - 12 and upc a data, size, image with office excel barcode sdk
EXAMPLE 33-4
Control code-128 image for visual c#.net
generate, create code 128 code set a none on visual c# projects
http://actionscriptbible.com/ch33/ex4
Linear Barcode barcode library on .net
generate, create linear barcode none on .net projects
Visualizing Captured Audio Data
package { import flash.display.Sprite; import flash.events.ActivityEvent; import flash.events.SampleDataEvent; import flash.media.Microphone; import flash.utils.ByteArray; public class ch33ex4 extends Sprite { protected var mic:Microphone; public function ch33ex4() { mic = Microphone.getMicrophone(); mic.rate = 22; mic.addEventListener(SampleDataEvent.SAMPLE_DATA, onSampleData); }
33: Capturing Sound and Video
protected function onSampleData(event:SampleDataEvent):void { var waveform:ByteArray = event.data; var SAMPLES:Number = waveform.length / 4; //4 bytes per float var W:Number = stage.stageWidth; var H:Number = stage.stageHeight; var xstep:Number = W/SAMPLES; graphics.clear(); graphics.lineStyle(0, 0); graphics.moveTo(0, H/2); for (var i:int = 0, x:Number = 0; i < SAMPLES; i++, x+=xstep) { var amplitude:Number = waveform.readFloat(); var y:Number = H/2 + (amplitude * H/2); //amplitude is from -1 to 1 graphics.lineTo(x, y); } } } }
You can de nitely get crazy with analyzing microphone input. You might even consider attempting to use one of the many C sound libraries using Alchemy (a product that runs C code in a virtualized C runtime inside the AVM2, allowing you to use C code alongside ActionScript 3.0).