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Lab%206%20-%20Audio%20Lab

Lab%206%20-%20Audio%20Lab - IST 195 Student Guide for...

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IST 195 – Student Guide for Laboratory Session - 6 Computer Peripherals - Audio IST 195 Lab – Using computer peripherals The purpose of this lab is to understand how computer peripherals work. Here you will learn how computers distinguish between analog and digital signals as well as how the computer acts as a transducer by converting incoming analog signals to one of the standard format digital signals. In this lab exercise we will be experimenting with audio signals using headphones but the principles are the same for digitizing analog signals for other computer peripherals like keyboards, monitors, mice, joysticks and printers. Learning Outcomes After completing this lab, you will be able to: Describe computer peripherals and how they work Explain the difference between analog and digital signals Explain the concept of transduction Use a digital audio editor called Audacity to create an audio clip BASIC LAB – “B” Level Lab Part 1: Preparing to create an audio file For this lab, you will create a short audio file using a standard recording format called .wav. Your audio file should include the following components: A timing track called a tick track A personal audio/voice track A music background loop 1
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IST 195 – Student Guide for Laboratory Session - 6 Computer Peripherals - Audio Part 2: Plugging in your headsets The sound card is the hardware whose function it is to input and output audio signals for the computer. The computers in the iLab have an integrated sound card, which means that the sound card components are on the motherboard, rather than on a separate card. The input and output connectors for the sound card are typically on the back of the tower, and are labeled and color- coded. Refer to the diagram below for the function of each connection. (For the computers in the iLab, you can find the input and output connectors on the front.) a. Connect the microphone to the pink microphone connector on the back of the machine. b. Connect the headset to the green line-out connector on the back of the machine. There are many tools for capturing and editing audio. We will be using an open source application called AUDACITY . Audacity is a software application that allows you to record and edit your sounds or audio. It is available at http://audacity.sourceforge.net . If you are doing this lab at home, you will need to download and install a copy of Audacity. You might also have to download a copy of the LAME Encoder, needed by Audacity to encode to mp3 format: http://www.free-codecs.com/Lame_Encoder_download.htm (if this site is down, Google "lame encoder” and you'll find a site that carries it.) It is a zip file, and you'll have to unzip it before using the required .dll file.
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