| 释义 |
loudness|ˈlaʊdnɪs|
[OE. hlúdnis, f. hlúd loud + -nis -ness.]
1. The quality or condition of being loud; an instance of this. Also, the (great or small) extent to which a sound is heard as loud.
c1050Byrhtferth's Handboc in Anglia (1885) VIII. 332 Clamor on lyden on englisc ys hludnys. c1440Promp. Parv. 314/1 Lowdenesse, altitudo. 1530Palsgr. 241/1 Loudnesse, haultesse. 1647Crashaw Poems 131 His prayers took their price and strength Not from the loudness nor the length. 1733Swift New Simile for Ladies 21 When th' alarum-bell is rung Of Xanti's everlasting tongue, The husband dreads its loudness more Than lightning's flash or thunder's roar. 1860Tyndall Glac. i. ii. 16 These echos would diminish in loudness just as the images of the candle diminish in brightness. 1881H. James Portr. Lady xxv. in Macm. Mag. XLIII. 413 Naturally, he couldn't like her style, her loudness, her want of repose. 1881Broadhouse Mus. Acoustics 394 They produce beats, or loudnesses separated by silences. 1937Ann. Reg. 1936 65 It was suggested that an overall loudness of 90 phons at a lateral distance of 18 ft. should be the maximum permitted for a private car running on full throttle at 30 m.p.h. 1948P. M. Morse Vibration & Sound (ed. 2) vi. 226 Corresponding to the physical quantities intensity and frequency are the physiological (or, rather, psychophysiological) quantities loudness and pitch. Ibid. 227 The bottom curve, for zero loudness, is the threshold of hearing, below which a sound..is inaudible to the average person. 1959Chambers's Encycl. XII. 728/1 It is important to distinguish between sound intensity—a physical quantity measurable in definite physical units; and loudness—the magnitude of the auditory sensation produced by that sound and therefore a subjective quantity depending upon personal judgements. 1961G. A. Briggs A to Z in Audio 117 Although loudness depends primarily on actual intensity, it is also strongly affected by frequency. 1962A. Nisbett Technique Sound Studio xi. 196 Equal loudness from the two voices will not generally be required.
2. attrib., as loudness level, loudness scale; loudness control, a device on an audio amplifier which corrects for the change in quality of reproduced sound at low volumes by boosting the bass (and often also the treble) relative to the middle frequencies, either combined with a volume control or as a separate on-off switch.
1961G. A. Briggs A to Z in Audio 117 When the volume is turned down, music tends to sound thin and emaciated. The effect may be counteracted to some extent by bass and treble boost in the amplifier. A *loudness control is a device which automatically applies bass and treble boost as volume is reduced. 1970J. Earl Tuners & Amplifiers i. 18 An idea which is popular in Europe and America (though not often liked in Great Britain) is the so-called loudness control. Ibid., Some amplifiers are equipped only with a loudness control, while others feature the ordinary (non-compensated) volume control which can be changed to loudness control action by means of a switch. 1975Gramophone May 2026 (Advt.), Separate loudness control.
1938Bell Lab. Rec. XVI. 213/1 The intensity level of the 1000-cycle reference tone was defined as the *loudness level of this tone, and any other sound which is judged by listeners to be equally loud is said to have an equal value of loudness level. Ibid. 214/2 The unit to be used for intensity level measurements is the decibel, but the unit to be used for the equivalent loudness level measurements is the phon.
1934Discovery Dec. 346/2 The number of phons and decibels coincides for the *loudness scale applying to the frequency 1,000 cycles per second, but for no other frequency. |