R Vin (t) Vout (t) Fig. 1. A simple lowpass filter circuit R Vin (t) Vout (t) Fig. 2. A simple series-resonant circuit 1 Wo = LC .Equation 8 3.2 The Notch Filter Circuit For the circuits in Fig. 1 and Fig. 2, let the input and output sinusoids be given Vin(t) = cos(wt) Vout (t) = Vout Cos(wt + Oout) where w is the independent frequency variable, and Vout and 0ut are the unknov Let C = 0.047µF, L = 100 mH, and R= 820 N in the circuit of Fig. 2. 1. Using equation (8) above, determine the notch frequency fo, in Hz. 2. At the notch frequency, calculate the voltage across the capacitor, and expre it in the form vc(t) = Vc cos(2T fot + Oc). Is vc(t) leading or lagging v(t)?

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Filter

A filter is a device or process which removes some of the unwanted features or components like frequencies from a signal in signal processing. The feature of filters is the complete or partial suppression of some part of the signal, and filtering is a class of signal processing. This most often means removing some frequency bands or some frequencies. In the frequency domain, the filters do not exclusively act, especially in the image processing field many other targets for filtering exist. Without having to act in the frequency domain, the correlations can be removed for certain frequency components and not for others. The filters are widely used in electronics and telecommunication, in television, radio, radar, audio recording, music synthesis, control systems, computer graphics, and image processing.