| 单词 | exponential horn |
| 释义 | > as lemmasexponential horn exponential horn n. a horn (horn n. 15) whose cross-sectional area increases exponentially towards its open end, used to emit or receive either sound or radio waves efficiently. ΚΠ 1923 Electric Jrnl. Nov. 397/2 The long exponential horn with small throat and reasonably large mouth gives about the same average response over the frequency range as does the shorter horn. 1945 Radio Craft (Springfield, Mass.) Oct. 22/1 If a highly directional beam is to be broadcast or received using the horn type antenna, an exponential horn may be used. 2013 E. J. Johnson Why you hear what you Hear xvi. 323 If we wanted to get the sound directly out of a trumpet with little reflection, we'd use an exponential horn with a wide mouth, not a trumpet—shaped one with a small mouth. < as lemmas |
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