| 单词 | sequencer |
| 释义 | ▪ I. sequencer1 Now Hist.|ˈsiːkwənsə(r)|
[a. OF. sequencier (AF. *sequencer), ad. L. sequentiārius: see sequentiary.]
A book containing sequences.
1488in Archæologia XLV. 118 A Primer and a Sequencer. 1904Wordsw. & Littlehales Old Service-bks. Index, Sequentiale, Sequentiarius, a Sequencer, or Book of Sequences.
▪ II. sequencer2|ˈsiːkwənsə(r)|
[f. sequence n. + -er1.]
1. a. (See quot.)
1954Computers & Automation Dec. 21/1 Sequencer, in punch card machinery, a mechanism which will put items of information in sequence.
b. An apparatus for performing or initiating operations in the correct sequence; spec. one forming part of the control system of a computer.
1964New Scientist 6 Feb. 319/1 A late decision to photograph the Moon in passing was defeated by a malfunction in the so-called central computer and sequencer. 1977N. Freeling Gadget v. 222 We..make an automatic sequencer which takes over the work of sending the signals. 1978D. J. Kuck Struct. Computers & Computations I. iv. 282 The sequencer drives the entire machine through a specified sequence of events which carry out (indeed are) whatever the instruction is defined to do.
2. Biochem. An apparatus for determining the sequence of monomers in a biological polymer.
1971European Jrnl. Biochem. XX. 89 Using the sequencer and unpurified reagents, it was possible to degrade entirely a 0·24 µmole sample of the 21 amino acid insulin A-chain (oxidized) and to analyze the products. 1977Sci. Amer. Oct. 103/1 The exact positions at which the labeled amino acid appears are determined with the aid of an automatic machine called a sequencer, which chemically removes one amino acid at a time from the polypeptide chain beginning at the amino terminal (NH2) end.
Add:3. Mus. A programmable electronic device capable of storing a sequence of musical notes, chords, or other signals which can then be reproduced when required.
1975J. E. Rogers in Appleton & Perera Devel. & Pract. Electronic Mus. v. 190 Sequencers and keyboards have at most a few hundred memory positions. 1984D. Crombie Synthesizer & Electronic Keyboard Handbk. 72/3 There are three basic types of sequencer: analog, digital and hybrid-computer sequencers. 1985Listener 24 Oct. 43/4 The Synclavier also has a ‘sequencer’, which is like a word processor for music: you can use it to program the machine to play ‘Chopsticks’ for you. 1989Rhythm Mar. 30/2 Musicians create their rhythm patterns in the sequencer rather than on the drum machine. |
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