lowpass en · ADJ
Etymology
From low + pass.
Meanings
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(not-comparable) Describing a filter, circuit, or system that rejects or attenuates a frequencies above a specified value while passing those be.
From the “highpass-lowpass” filter, “bandpass-bandreject” filter, or the flat amplifier, the signal, after suitable amplification with adjustable gain, may be fed to a meter which gives the root mean square value of the voltage, …
1950, Machinery and Production Engineering, volume 77, number 2, Machinery Publishing Company, page 636: