Attenuation, dissipation, conversion, plot, degrade, noise ,distortion

1. All transmitted signals are to some extent … by the environment through which they propagate. 2. Reduction in power is called … . 3. … is any undesired change in the amplitude or phase of any component of an information signal that causes a change in the overall waveform of the signal. 4. The … of channel attenuation as the signal frequency is varied is known as the attenuation spectrum. 5. … and distortion are commonly introduced by all transmission media. 6. Since all practical conductor materials are characterized by some electrical resistance, part of the electric current is always lost by … to heat.

 

9. Вставьте пропущенные предлоги:

1. All transmitted signals are degraded by the environment … which they propagate. 2. The principal cause … power loss is dissipation. 3. A radiating antenna converts a time-varying electric current … an electromagnetic wave or field. 4. Signal degradation generally falls … three types: noise, distortion, and attenuation . 5. Propagation of the wave is always accompanied … a flow of electric current through the conductor. 6. Optical wavelengths are naturally suited … high-rate broadband telecommunication. 7. Both noise and distortion are commonly introduced … all transmission media, and they both result in errors in reception.

 

Text 2. Wire Media Types

 

10. Выучите следующие слова и выражения: