A Brief Discussion of Filters

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A Brief Discussion of Filters

Low Pass Filter

In most cases, filters extract the required frequency from a signal. Low-pass filters only permit frequencies falling below and attenuating frequencies above the cutoff frequency.

Fig: Low Pass Filter

A low pass filter's cutoff frequency is calculated as

Cut off frequency = 1 / 2*pi*R*C

High Pass Filter

All frequencies in a signal above the high pass filter's cutoff frequency can pass through the high pass filter.

Fig: High Pass Filter

A high pass filter's cutoff frequency is calculated as

Cut off frequency = 1 / 2*pi*R1*C1

Band Pass Filter

A band pass filter is a device that permits frequencies that fall within a specific frequency range. Both frequencies inside and outside of the field are attenuated.

Fig: Band Pass Filter

All frequencies above (1/2*pi*R1*C1) and below (1/2*pi*R2*C2) are passed by the band pass filter shown in the figure above.

Keep in mind that a bandpass filter is a combination of a high pass and a low pass filter.

Q. What are the filter coefficients for Low Pass and High Pass filters?

A. The filter coefficients for Low Pass Filter are [1 1]

and the filter coefficients for the High Pass filter are [1 -1]

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