aliasingn.

Brit.

/ˈeɪlɪəsɪŋ/, U.S.

/ˈeɪliəsɪŋ/

Origin: Formed within English, by derivation. Etymons: alias v., -ing suffix¹.

Etymology: < alias v. + -ing suffix¹. Compare alias n. 4.

a. Electronics. The imperfect or faulty copying or reproduction of a sampled signal which occurs if the sampling frequency is too low, with the result that the original signal cannot be uniquely reconstructed. Cf. alias n. 4.This is likely to happen if the sampling frequency is less than twice the frequency of the highest-frequency component present in the signal being sampled. Cf. Nyquist frequency n. at Nyquist n. 4b.

ΚΠ

1957 Jrnl. Royal Statist. Soc. B. 19 59 If, however, the spectrum is known to extend to several hundred cycles per second, the analysis would be seriously affected by the fact that the spectrum beyond the 20 c.p.s. region would fold back on itself and interfere with the estimation of the spectrum in the 0–20 c.p.s. region—this is what Professor Tukey has called ‘aliasing’.

1986 Electronic Musician May 73/3 The frequency response is limited, high-frequency sounds are prone to aliasing, and it's not exactly noise-free.

2004 Future Music May 69/3 If there's one problem, it's that there is some aliasing evident in the oscillators.

b. Computing. The distortion of an image when too few pixels are used to represent it, one consequence of which is that smooth lines appear jagged.

ΚΠ

1976 Photo-Electronic Image Devices: Proc. Sixth Symp. 714 In an optimised system the digital pixel size should be such that there are at least two digital elements per limiting spatial frequency in the optical image. This is advisable to eliminate aliasing and to minimise the spatial filtering due to the sampling process.

1981 Cartographica 18 iii. 26 Raster aliasing..is a systematic sampling error.

2002 Electronic Gaming Monthly Feb. 42/1 Aliasing is what you're really talking about when referring to ‘jaggies’. This is the stairstep, jagged look of polygon edges you see on early PS2 games.

2009 New Yorker 11 May 81/1 Before you reconfigure, mount a scratch monkey. A dogcow makes a moof. An aliasing bug can smash the stack.

2. Computing. The existence of more than one variable pointing to the same location in memory. Also: the use of aliases in programming or emailing.

ΚΠ

1977 SIGPLAN Notices Mar. 13/2 In ‘Algol-like’ languages the rules connecting names (identifiers) to what they denote (e.g., variables) give rise to some subtle..problems. Some variables..may be accessible by more than one name. Thus, assignment to x may change y. We will call this aliasing.

1989 Byte Aug. 126/1 The new Finder is also supposed to include many file management features..including file aliasing.

2001 Sydney Morning Herald (Nexis) 14 Aug. 5 These include free sub-domain registration..and unlimited email aliasing and forwarding.

2007 B. Costales et al. Sendmail (ed. 4) i. 5 Aliasing is also available to the individual user via a file called ~/.forward in the user's home directory.

This is a new entry (OED Third Edition, September 2012; most recently modified version published online June 2022).

单词	aliasing
释义	aliasingn. Brit. /ˈeɪlɪəsɪŋ/, U.S. /ˈeɪliəsɪŋ/ Origin: Formed within English, by derivation. Etymons: alias v., -ing suffix¹. Etymology: < alias v. + -ing suffix¹. Compare alias n. 4. 1. a. Electronics. The imperfect or faulty copying or reproduction of a sampled signal which occurs if the sampling frequency is too low, with the result that the original signal cannot be uniquely reconstructed. Cf. alias n. 4.This is likely to happen if the sampling frequency is less than twice the frequency of the highest-frequency component present in the signal being sampled. Cf. Nyquist frequency n. at Nyquist n. 4b. ΚΠ 1957 Jrnl. Royal Statist. Soc. B. 19 59 If, however, the spectrum is known to extend to several hundred cycles per second, the analysis would be seriously affected by the fact that the spectrum beyond the 20 c.p.s. region would fold back on itself and interfere with the estimation of the spectrum in the 0–20 c.p.s. region—this is what Professor Tukey has called ‘aliasing’. 1986 Electronic Musician May 73/3 The frequency response is limited, high-frequency sounds are prone to aliasing, and it's not exactly noise-free. 2004 Future Music May 69/3 If there's one problem, it's that there is some aliasing evident in the oscillators. b. Computing. The distortion of an image when too few pixels are used to represent it, one consequence of which is that smooth lines appear jagged. ΚΠ 1976 Photo-Electronic Image Devices: Proc. Sixth Symp. 714 In an optimised system the digital pixel size should be such that there are at least two digital elements per limiting spatial frequency in the optical image. This is advisable to eliminate aliasing and to minimise the spatial filtering due to the sampling process. 1981 Cartographica 18 iii. 26 Raster aliasing..is a systematic sampling error. 2002 Electronic Gaming Monthly Feb. 42/1 Aliasing is what you're really talking about when referring to ‘jaggies’. This is the stairstep, jagged look of polygon edges you see on early PS2 games. 2009 New Yorker 11 May 81/1 Before you reconfigure, mount a scratch monkey. A dogcow makes a moof. An aliasing bug can smash the stack. 2. Computing. The existence of more than one variable pointing to the same location in memory. Also: the use of aliases in programming or emailing. ΚΠ 1977 SIGPLAN Notices Mar. 13/2 In ‘Algol-like’ languages the rules connecting names (identifiers) to what they denote (e.g., variables) give rise to some subtle..problems. Some variables..may be accessible by more than one name. Thus, assignment to x may change y. We will call this aliasing. 1989 Byte Aug. 126/1 The new Finder is also supposed to include many file management features..including file aliasing. 2001 Sydney Morning Herald (Nexis) 14 Aug. 5 These include free sub-domain registration..and unlimited email aliasing and forwarding. 2007 B. Costales et al. Sendmail (ed. 4) i. 5 Aliasing is also available to the individual user via a file called ~/.forward in the user's home directory. This is a new entry (OED Third Edition, September 2012; most recently modified version published online June 2022). < n.1957
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