Filter 02
Filter 02 : (1) A device for separating components of a signal on the basis of its frequency. It allows components in one or more frequency bands to pass relatively unattenuated, and it greatly attenuates components in other frequency bands. (2) A fibrous medium used in respirators to remove solid or liquid particles from the airstream entering the respirator. (3) A sheet of material that is interposed between patient and the source of x rays to absorb a selective part of the x rays. (4) A fibrous or membrane medium used to collect dust, fume, or mist air samples
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