| 释义 |
rolloff, roll-off|ˈrəʊlɒf, -ɔː-|
[f. to roll off.]
1. Ten-Pin Bowling. A game to resolve a tie or determine the qualifier for a later round of competition.
1947Richmond (Va.) News-Leader 2 May 22 (heading) Scher wins Major Men's Pin Championship after rolloff. 1975Cleveland (Ohio) Plain Dealer 6 Apr. 7-c/3 When they bowl in the rolloffs each contestant will be presented a Brunswick bowling bag as the prize for gaining the finals. 1976Eastern Even. News (Norwich) 27 Aug., He won the roll-off competition with an eight game total of 1474 for a tournament average of 185. 1979Arizona Daily Star 22 July c2/4 He won in the two-frame roll-off.
2. The smooth fall of response with frequency of a piece of audio equipment or the like at an end of its range. Cf. roll v.2 11 and 25.
1950Audio Engin. Aug. 28/2 It is due to irregularities in the groove walls, and if heard through a flat system, sounds smooth or satiny, corresponding to initially white (flat spectrum) noise with perhaps some roll-off of the highs. 1956IRE Trans. Audio IV. 35/2 To obtain the smooth transition between the woofer and tweeter, the two units should be designed to complement each other, both as to level balance and for obtaining the required rolloff in the low-frequency unit at the crossover frequency. 1959Kuh & Pederson Princ. Circuit Synthesis xiii. 212 In practice, the roll-off of the magnitude of the transfer function of an m-derived delay line is primarily due to the dissipation of the inductances. 1975G. J. King Audio Handbk. ii. 39 From the practical point of view, it is commonly necessary to introduce infrabass roll-off at least to attenuate rumble and other infrasonic noises which are often present on the programme signal.
3. First throw at dice.
1966O. Norton School of Liars vi. 94 [We] flipped for roll-off. Wally's ace took the box. |