Common high pass filter slopes are 6dB, 12dB, 18dB, and 24dB per octave. The slope of a high pass filter is sometimes adjusted using the Q setting. It is measured in decibels (dB) per octave. The slope of a high pass filter determines the rate of attenuation. A high pass filter that does not have an infinitely variable cutoff frequency setting only allows for specific frequencies to be selected, using a switch. The cutoff frequency settings of most high pass filters are infinitely variable, meaning that an engineer can set the cutoff frequency more precisely, using a knob. Thus, the filter might actually begin at a higher frequency than stated by the cutoff adjustment. Often the cutoff frequency is the point at which the filter attenuates by -3dB. In the above example, 500Hz is the cutoff frequency. The cutoff frequency setting of a high pass filter adjusts where in the frequency spectrum the filter begins.
High Pass Filter Settings Cutoff Frequency This section will explore the basic operation of a high pass filter.
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