| 单词 | modulation index |
| 释义 | > as lemmasmodulation index modulation index n. a coefficient representing the degree of modulation of a carrier wave; spec. the ratio of the difference between the maximum and minimum frequencies of a frequency-modulated carrier, to the frequency of the modulating signal. ΘΚΠ the world > matter > physics > electromagnetic radiation > electronics > electronic phenomena > processes > [noun] > modulation > co-efficient modulation index1930 modulation factor1939 1930 B. van der Pol in Proc. IRE 18 1200 The amount of disturbance arising from frequency modulation depends..upon the value of the ratio m = Δω/p of the absolute frequency deviation to the imposed audio frequency p. Owing to the importance of this parameter m..it may be found useful to designate it by..the expression ‘frequency modulation index’. 1931 Proc. IRE 19 2151 B. van der Pol has introduced the expression ‘modulation index’ for mf. We shall use this term for both mp and mf [where mp represents the degree of phase modulation in a wave i = A0 sin (ω0t + mp sin μt)]. 1983 E. Trundle Beginner's Guide Videocassette Recorders ii. 19 If we can reduce the modulation index, the significant sidebands draw closer to the carrier frequency. < as lemmas |
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