| 释义 |
modulator|ˈmɒdjʊleɪtə(r)|
[a. L. modulātor, agent-n. f. modulārī to modulate.]
1. a. One who, or a thing which, modulates.
c1500Proverbis in Antiq. Rep. (1809) IV. 408 A perfyte modulatour makithe his songe trew. 1654Whitlock Zootomia 477 Poetry..is a most musicall Modulator of all Intelligibles by her inventive Variations. 1713Derham Phys.-Theol. v. v. (1727) 295 The Tongue..the artful Modulator of our Voice. 1834De Quincey Autobiogr. Sk. vi. Wks. 1862 XIV. 171 Thus, in a musical metaphor, the great man is the sole modulator and determiner of the key in which the conversation proceeds. 1896Mrs. Caffyn Quaker Grandmother 145 The haze was a modulator of all things—a balancer.
b. spec. A device that produces modulation of a wave (modulation 7). Also transf., a regulator, a controlling mechanism.
1919Proc. IRE VII. 193 The curvature of the characteristic..makes possible its employment as a modulator and detector. 1930Discovery Dec. 398/2 The output from the subscriber's telephone is amplified in the transmitting voice frequency amplifier and passes to the low frequency modulator. 1952[see modulate v. 5 a]. 1964M. Brotherton Masers & Lasers xv. 182 If we feed into a modulator a voice frequency of 256 cps along with a carrier frequency of 50,000 cps, the modulator reacts by producing two new frequencies—one the difference frequency at 49,744 cps and the other the sum frequency at 50,256 cps. 1970R. W. McGilvery Biochem. xxiii. 547 The deoxycytidine phosphates are not modulators of any of the reductions. 1970Sci. Amer. Nov. 120/1 The use of the laser for mass communication..awaits the development of a practical modulator: an apparatus for impressing multiple signals on the light beam. 1972Jazz & Blues Nov. 21/1, I..checked out this new modulator which a lot of people..are now using. You put in your voice and you get another sound on it. 1974Nature 17 May 250/1 Such a test might assess the role of putrescine as a potential modulator of growth in normal and neoplastic tissue.
2. A chart used in the ‘tonic sol-fa’ system, showing the relations of tones and scales.
1862Catal. Internat. Exhib. II. xxiv. 35 The Modulator, or pointing board for teaching tunes. |