Chapter 18

Focusing on the Frequency Responses

In This Chapter

arrow Understanding frequency response and types of filters

arrow Interpreting Bode plots

arrow Using circuits to create high-pass, low-pass, band-pass, and band-reject filters

When you hear your favorite music coming from various instruments and melodic voices, the unique sounds you hear consist of many frequencies. In a stereo system, you can adjust the low-frequency and high-frequency sounds by adjusting a stereo equalizer. Equalizers adjust the volume of a specific band of frequencies relative to others. They’re often used to boost the bass guitar on bass-hungry speakers or to bring out the vocals of a favorite singer.

With a combination of resistors, capacitors, and inductors, you can select or reject a range of frequencies. As a result, you can pick out frequencies to boost or cut. For audio applications, you can adjust the bass, treble, or midrange frequencies to get the sound quality you like best. You also find wide applications of frequency response and filtering in communication, control, and instrumentation systems.

How is this all possible? A major component found in older entertainment systems is an electronic filter that ...

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