| 单词 | radio echo |
| 释义 | > as lemmasradio echo d. In full radio echo. A radio wave which has been reflected or otherwise returned with sufficient magnitude and delay to be perceived as a wave distinct from that transmitted (see also quot. 1941). Also attributive and figurative. ΘΚΠ society > communication > telecommunication > radio communications > [noun] > signal > interference cross-talk1887 static1905 X1906 statics1912 click1914 jam1914 grinder1922 hash1923 mush1924 echo1928 image1928 radio echo1928 harmonic interference1929 second channel1932 1928 C. Størmer in Nature 3 Nov. 681/1 (heading) Short wave echoes and the Aurora Borealis. 1928 C. Størmer in Nature 3 Nov. 681/1 On Feb. 29 of this year I received a letter from Engineer Jørgen Hals..in which he says: ‘..I repeatedly heard signals from the Dutch short-wave transmitter station... At the same time as I heard the telegraph-signals I also heard echoes.’ 1928 C. Størmer in Nature 17 Nov. 768/1 (heading) Radio echoes and magnetic storms. 1930 Times 25 Mar. 11/4 Neither..appear to attach very much importance to these ‘echo’ effects... The effect of these ‘echoes’ at the receiving station can..be overcome by a directive aerial system which does not accept radiation from the backward direction. Echo signals may..also be produced by radiation leaving the transmitter..and travelling more than once round the world. 1941 B.B.C. Gloss. Broadc. Terms 10 Echo (1) Repetition of a sound after an interval of time, caused for example by reflection of sound waves, or occurring as a result of propagation of electro~magnetic waves over more than one path. (2) Reverberation artificially added to the output from a studio or hall. 1965 New Statesman 11 June 904/3 The hire-purchase controls just introduced, small enough not to induce substantial ‘echo’ effects in the future. radio echo radio echo n. = echo n. 1d. ΘΚΠ society > communication > telecommunication > radio communications > [noun] > signal > interference cross-talk1887 static1905 X1906 statics1912 click1914 jam1914 grinder1922 hash1923 mush1924 echo1928 image1928 radio echo1928 harmonic interference1929 second channel1932 1928 C. Størmer in Nature 17 Nov. 768/1 (heading) Radio echoes and magnetic storms. 1947 Sci. News 5 36 Radio echoes do not come from the meteors themselves but from the lengthy filament of highly conducting gas which forms their trail. 1996 New Scientist 22 June 16/1 Called Lake Vostok, the lake..is one of 77 lakes known to lie under the Antarctic ice sheet. It came to light during radio-echo experiments in the late 1970s. < as lemmas |
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