lowpass

adj

1. (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, …”