| Subject | English | German |
| commun. | first order linear filter | lineares Filter der ersten Ordnung |
| automat. | linear filter | Linearfilter |
| commun. | linear filter | lineares Filter |
| opt. | linear filter | lineares Filter (its transmittance is a continuous linearly increasing or decreasing function of wavelength) |
| IT, earth.sc. | linear phase digital filter | Digitalfilter mit linearer Phase |
| el. | linear phase filter | Linearphasenfilter |
| automat. | linear-slope delay filter | Verzögerungsfilter mit linearer Kennliniensteilheit |
| automat. | non-linear filter system | nichtlineares Filtersystem |
| nat.sc. | non-linear adaptive filter | nichtlinearer Angleichfilter |