| 释义 |
preˈamplify, v.
[pre- A. 1.]
trans. To subject to a preliminary amplification; to amplify in a preamplifier. Hence preˈamplified ppl. a.
1959Geophysics XXIV. 750 The reflected signal detected by the hydrophone is pre-amplified, passed through a variable passive filter, then amplified and printed on the recorder. 1978Nature 13 July 135/1 After cell contact, lock-in amplifiers sample preamplified cell potentials..at selectable phase angles. Ibid. 14 Sept. 111/2 The signals were preamplified and detected by two automatic gain⁓controlled receivers.
Hence preamplifiˈcation, the action or result of preamplifying.
1960Practical Wireless XXXVI. 397/1 The amplifier has sufficient gain for many purposes with no pre-amplification. 1971Melody Maker 13 Nov. 36/5 A new concept in sound engineering..is the Mark 3 Jam-Pak series, a unique idea in pre-amplification systems. 1977Rolling Stone 13 Jan. 58/2 Most ribbon mikes produce lower output signals than most dynamic types and require more preamplification. |