
Principles of Analog Electronics
6
whereby knowing the velocity v and the frequency f of a wave, it is possible to
calculate the wavelength λ.
A real signal is necessarily limited in time and, therefore, every real signal pres-
ents frequency bounds. In electronic jargon, these bounds determine the band,
aterm that actually means interval, so that a frequency interval corresponds to
a band of frequency, and every real signal has its band limitation.
Table 1.2 shows some typical bands of frequency for signals.
Examples
In the United States, the frequency of household electricity is 60 Hz, meaning
the sinusoidal wave repeats itself 60 times in a second, ...