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As previously described, sound is vibration traveling through a substance. These vibrations can be captured by a microphone. Microphones convert the vibrations that travel through air into a constantly varying electrical current. When a microphone is used to capture sound by a computer, that sound is digitized. Specifically, amplitude samples of a specific size (sample size) are taken many times a second (sample rate). This stream of data is called a PCM (pulse code modulation) stream, which forms the foundation for digital audio. Taken all together, the samples represented in the PCM stream digitally represent the audio waveform that is captured. The higher the sample rate, the more accurate the representation and the higher the frequency of audio that can be captured. As we learned in the previous chapter, when we started working with the AudioRecord class, these parameters may be passed into the constructor of the AudioRecord class when creating an object. To revisit what each of the parameters means, please see the Raw Audio Recording with AudioRecord section in 7. NOTE: The Nyquist sampling theorem, named after Harry Nyquist, who was an engineer for Bell Labs in the early to mid-twentieth century, explains that the highest frequency that may be captured by a digitizing system is one half of the sample rate used. Therefore, in order to capture audio at 440 Hz (middle A), our system needs to capture samples at 880 Hz or higher. Here is a quick recap of the steps required to capture audio using an object of type AudioRecord.

Additionally, you need to wire up an event handler for the Button.Click event, as shown here: protected void Button1_Click(object sender, System.EventArgs e) { lblInfo.Text += "Button1.Click event handled.<br />"; } You may have noticed that the Button.Click event handler requires a different accessibility level than the page event handlers. The page event handlers are private, while all control event handlers are protected. To understand this difference, you need to reconsider the code model that was introduced in 2. Page handlers are hooked up explicitly using delegates in a hidden portion of designer code. Because this designer code is still considered part of your class (thanks to the magic of partial classes), it can hook up any method, including a private method. Control event handlers are connected using a different mechanism the control tag. They are bound at a later stage of processing, after the markup in the .aspx file and the code-behind class have been merged together. ASP .NET creates this merged class by deriving a new class from the code-behind class. Here s where things get tricky. This derived class needs to be able to access the event handlers in the page so it can connect them to the appropriate controls. The derived class can access the event handlers only if they are public (in which case any class can access them) or protected (in which case any derived class can access them).

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Although it s acceptable for page event handlers to be private, it s a common convention in ASP.NET 2.0 code to make all event handlers protected, just for consistency and simplicity.

int frequency = 8000; int channelConfiguration = AudioFormat.CHANNEL_CONFIGURATION_MONO; int audioEncoding = AudioFormat.ENCODING_PCM_16BIT; int bufferSize = AudioRecord.getMinBufferSize(frequency, channelConfiguration, audioEncoding); AudioRecord audioRecord = new AudioRecord( MediaRecorder.AudioSource.MIC, frequency, channelConfiguration, audioEncoding, bufferSize); short[] buffer = new short[blockSize]; audioRecord.startRecording(); while (started) { int bufferReadResult = audioRecord.read(buffer, 0, blockSize); } audioRecord.stop();

In this chapter I covered the most important Spring Security concepts. You have seen how to secure Java applications using both URL patterns and method security. I explained the important role of filters and the filter chain, and showed how Spring Security uses the DelegatingFilterProxy object to delegate all requests to the other filters added by default into the filter chain stack. Then I showed you how to add a custom authentication filter into the filter chain to replace the default one. Finally, I touched on the most important authentication processes using databases, LDAP repositories, and static values. Application security is very important in enterprise development, and thanks to Spring Security, you don t have to be a security analyst anymore the Spring Security framework already does most of the job. Instead, you can focus on deciding what the best user storage and authentication/authorization solution for your needs is. In the next chapter I will introduce you to the Flex framework that we will use to develop the view layer.

Figure 3-5 shows the ASP.NET page after clicking the button, which triggers a postback and the Button1.Click event. Note that even though this event caused the postback, Page.Init and Page.Load were both raised first.

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