tag:blogger.com,1999:blog-12894909463428380692012-02-16T20:40:31.792-08:00Sunil Saharanhttp://www.blogger.com/profile/16210408187010064473noreply@blogger.comBlogger11100tag:blogger.com,1999:blog-1289490946342838069.post-12440504632447128652010-07-19T10:24:00.001-07:002010-07-19T10:26:36.312-07:00<h2>What is a filter ?</h2><br />It is sometimes desirable to have circuits capable of selectively filtering one frequency or range of frequencies out of a mix of different frequencies in a circuit. A circuit designed to perform this frequency selection is called a filter circuit, or simply a filter. A common need for filter circuits is in high-performance stereo systems, where certain ranges of audio frequencies need to be amplified or suppressed for best sound quality and power efficiency. You may be familiar with equalizers, which allow the amplitudes of several frequency ranges to be adjusted to suit the listener's taste and acoustic properties of the listening area. You may also be familiar with crossover networks, which block certain ranges of frequencies from reaching speakers.<br /><h2> Quick Review </h2><br />A filter is an AC circuit that separates some frequencies from others within mixed-frequency signals.<br />Audio equalizers and crossover networks are two well-known applications of filter circuits.<br />A Bode plot is a graph plotting waveform amplitude or phase on one axis and frequency on the other.<div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/1289490946342838069-1244050463244712865?l=electrical-helpline.blogspot.com' alt='' /></div>Sunil Saharanhttp://www.blogger.com/profile/16210408187010064473noreply@blogger.com0