| 释义 |
subharˈmonic, n. and a.
Also sub-harmonic.
[sub- 9.]
A. n. An oscillation with a frequency equal to an integral submultiple of another frequency. Freq. attrib.
1924W. N. Bond in Nature 8 Mar. 355/2 The production of the half frequency easily, of the third frequency with care, and of the fourth frequency faintly..leaves little doubt that the frequencies obtainable are all sub⁓multiples of the fundamental applied frequency... These forced vibrations might be described as sub-harmonics. 1940H. F. Olson Elem. Acoustical Engin. vii. 137 It has been analytically shown..that subharmonics are possible in certain vibrating systems. 1952[see frequency divider s.v. frequency 5]. 1961M. L. Gayford Acoustical Techniques & Transducers iii. 67 A curvature of the sides of the [loudspeaker] cone assists the suppression of sub⁓harmonics. 1976Gloss. Terms Mech. Vibration & Shock (B.S.I.) 12 Subharmonic response, a response of a mechanical system exhibiting some of the characteristics of resonance at a frequency having a period that is an integral multiple of the period of the periodic excitation. 1978A. B. Pippard Physics of Vibration I. ix. 253 Each sub⁓harmonic is stable over a limited range of excitation.
B. adj. Involving or being a subharmonic.
1940H. F. Olson Elem. Acoustical Engin. vii. 137 Another feature of subharmonic phenomena is the relatively long time required for ‘build up’. 1962A. Nisbett Technique Sound Studio 245 Paper cones are often corrugated to reduce any tendency to ‘break up’ radially and produce sub-harmonic oscillations. 1978A. B. Pippard Physics of Vibration I. ix. 253 The pin is shown making contact with the cone every other cycle of the latter, and therefore responding in the octave subharmonic mode. |