Table 1 lists the approximate velocity of sound in air and other media. In gases, the higher the velocity of sound, the higher the pitch will be (Remember the "Mickey Mouse" sound when people talk after inhaling helium gas?).

Thermal noise occurs in all transmission media and communication equipment, including passive devices. It arises from random electron motion and is characterized by a uniform distribution of energy over the frequency spectrum with a Gaussian distribution of levels ; the higher the temperature of the components or the medium, the greater the level of thermal noise.


Various - Noise Problems Selections Vol. 7 - 13Various - Noise Problems Selections Vol. 7 - 13Various - Noise Problems Selections Vol. 7 - 13Various - Noise Problems Selections Vol. 7 - 13

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