Definition of "highpass" [highpass]

• An audio filter that discards lower frequencies while preserving higher ones. (noun)

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• "Very cool masking technique for the GIMP: Perfect masking using a highpass."
• "That said, normally, a filter operation does not subtract the output from the input in such a manner, i.e. a highpass filter would be used to remove the low frequencies, and a separate lowpass filter would be used to remove the high frequencies ."
• "I.e. typically you would take the “mirror” highpass filter and apply it to the original data to get the proper output."