31 Acoustics, audio, and high fidelity

Chapter 31 Acoustics, audio, and high fidelity

Teach Yourself Electricity and Electronics Third Edition Book
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Teach Yourself Electricity and Electronics Third Edition Book

  • 31CHAPTERAcoustics, audio, andhigh fidelityUP TO THIS POINT, WE HAVE STUDIED COMPONENTS, CIRCUITS, AND SYSTEMS INwhich esthetic appeal is not especially important. When you are stranded in a snow-storm and you switch on the cell phone to call for help, you probably won’t care whatthe phone set looks like, nor will you be too worried about the fidelity of the audio com-ing through the earpiece (as long as you can understand what the other party is saying).Efficiency and reliability will be your main concerns. But when it comes to soundrecording and reproduction, especially when music is involved, quality comes to thefore. Minimizing distortion, for example, becomes more important than amplifier efficiency.AcousticsThe term acoustics refers to the physics of sound waves as they are transmittedthrough air. Acoustics is important to architects and engineers who design and buildconcert halls, where sound must propagate from a stage or speaker system to a largenumber of people. Engineers consider acoustics in the construction of speaker en-closures. Some knowledge of acoustics is helpful if you want to set up a high-fidelity(hi-fi) sound system.The sound spectrumSound consists of molecular vibrations at audio frequency, ranging from about 20 Hzto 20 kHz. Young people can hear the full range of audio frequencies; older peoplelose hearing sensitivity at the upper and lower extremes. An elderly person mightonly hear sounds from 50 to 5000 Hz.583Copyright © 2002, 1997, 1993 by The McGraw-Hill Companies. Click here for terms of use.