<P> Integrated circuits, FPGAs and other electrical components can then be assembled on printed circuit boards to form more complicated circuits . Today, printed circuit boards are found in most electronic devices including televisions, computers and audio players . </P> <P> Electronic engineering has many subfields . This section describes some of the most popular subfields in electronic engineering; although there are engineers who focus exclusively on one subfield, there are also many who focus on a combination of subfields . </P> <P> Signal processing deals with the analysis and manipulation of signals . Signals can be either analog, in which case the signal varies continuously according to the information, or digital, in which case the signal varies according to a series of discrete values representing the information . </P> <P> For analog signals, signal processing may involve the amplification and filtering of audio signals for audio equipment or the modulation and demodulation of signals for telecommunications . For digital signals, signal processing may involve the compression, error checking and error detection of digital signals . </P>

Applications of differential equations in electronics and communication engineering