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| Subject | English | German |
| commun. | first order linear filter | lineares Filter der ersten Ordnung |
| 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 |
| nat.sc. | non-linear adaptive filter | nichtlinearer Angleichfilter |