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Sound Chapter 18 2007 The McGraw Hill Companies Inc All rights reserved Overview In this chapter you will learn to Describe how sound works in a PC Select the appropriate sound card for a given scenario Install a sound card in a Windows system Troubleshoot problems that might arise with sound cards and speakers 2007 The McGraw Hill Companies Inc All rights reserved How Sound Works in a PC 2007 The McGraw Hill Companies Inc All rights reserved Sound Capture Basics Four components for capturing and outputting sound 1 2 3 4 Sound card Speakers Microphone Recording Playback software 2007 The McGraw Hill Companies Inc All rights reserved Sound Capture Basics Sampling capturing sound Sampling rate is measured in cycles per second KHz Low quality 11 KHz to high quality 192 KHz Doesn t capture every nanosecond of sound Takes samples and extrapolates or predicts what the data is between samples Dotted line can you connect the dots 2007 The McGraw Hill Companies Inc All rights reserved Sound Capture Basics Sampling capturing sound Bit depth Number of characteristics of a particular sound for each sample Amplitude loudness Frequency tone Timbre qualities from different instruments 2007 The McGraw Hill Companies Inc All rights reserved Sound Capture Basics Waveforms are commonly sampled with either 8 or 16 bits per sample 8 bit stores 28 or 256 different characteristics 16 bit stores 216 or 65 536 different characteristics Tracks Monaural one track Stereo two tracks CD quality 44 1 KHz 16 bit depth 2007 The McGraw Hill Companies Inc All rights reserved Recorded Sound Formats Pulse code modulation PCM Developed for telephone calls Better known as the WAV format Large files Four minute song at 44 1 KHz and 16 bit stereo is greater than 40 MB Compressor decompressor CODEC programs Algorithms developed to compress sound files MPEG 1 Layer 3 codec or MP3 is one example of a codec 2007 The McGraw Hill Companies Inc All rights reserved Playing Sounds Every sound card can play WAV



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