Fidelity

2025-07-24T13:26:38Z

87.90.80.199: /* References */

{{Short description|Quality of faithfulness or loyalty to another person or group}}
{{Other uses}}
{{Unfocused|date=March 2023}}
[[File:4243 - Venezia - Palazzo ducale - Capitello 28 - In fidelitate nullli gero - Foto Giovanni Dall'Orto, 30-Jul-2008.jpg|thumb|right|220px|[[Doge's Palace, Venice|Palazzo Ducale in Venice]]: [[:commons:Category:Capitals in the Doge's Palace (Venice) - 28|capital # 28]] in the porch, featuring Virtues and vices — '''In fidelitate nulli gero''' (Fidelity)]]

'''Fidelity''' is the quality of [[faithfulness]] or [[loyalty]]. Its original meaning regarded [[duty]] in a broader sense than the related concept of ''[[fealty]]''. Both derive from the [[Latin]] word {{lang|la|fidēlis}}, meaning "faithful or loyal". In the [[City of London]] financial markets it has traditionally been used in the sense encompassed in the motto "my word is my bond".

== In moral philosophy ==
In moral philosophy, fidelity refers to a person who keeps agreements. Strong fidelity refers to a person who keeps agreements even if not mutually beneficial to the other person. <ref>{{Cite journal |last=Kuhn |first=Steven T. |date=1996 |title=Agreement Keeping and Indirect Moral Theory |url=https://www.jstor.org/stable/2940872 |journal=The Journal of Philosophy |volume=93 |issue=3 |pages=105–128 |doi=10.2307/2940872 |issn=0022-362X|url-access=subscription }}</ref>

==<span id="lofi"></span> Audio and electronics==
{{See also|Sound recording and reproduction}}
In audio, "fidelity" denotes how accurately a copy reproduces its source. In the 1950s, the terms "[[high fidelity]]" or "hi-fi" were popularized for equipment and recordings which exhibited more accurate [[sound reproduction]].<ref>{{cite book |last1=Hartley |first1=H. A. |title=Audio Design Handbook |url=http://www.tech-systems-labs.com/books/hartley.pdf |archive-url=https://web.archive.org/web/20090127021505/http://www.tech-systems-labs.com/books/hartley.pdf |url-status=dead |archive-date=2009-01-27 |format=PDF |access-date=2009-08-08 |year=1958 |publisher=Gernsback Library |location=New York, New York |id=[[Library of Congress]] Catalog Card No. 57-9007 |pages=7, 20}}</ref> For example, a worn [[gramophone record]] will have a lower fidelity than one in good condition, and a recording made by a low budget record company in the early 20th century is likely to have significantly less audio fidelity than a good modern recording.{{Citation needed|date=January 2020}} Similarly in [[electronics]], fidelity refers to the correspondence of the output signal to the input signal, rather than sound quality, as in the popular internet connection technology "[[Wi-Fi]]".{{Citation needed|date=January 2020}}

The term "[[Lo-fi music|lo-fi]]" has existed since at least the 1950s, shortly after the acceptance of "hi-fi", but its definition evolved continuously between the 1970s and 2000s. In the 1976 edition of the ''Oxford Dictionary'',{{clarify|reason=Oxford University Press publishes many dictionaries. Which one?|date=June 2020}} lo-fi was added under the definition of "sound production less good in quality than '[[hi-fi]]'", and in the glossary of the 1977 book ''The Tuning of the World'', was defined as "unfavourable signal-to-noise ratio". In 2003, the ''Oxford Dictionary'' added a second definition: "A genre of rock music characterized by minimal production, giving a raw and unsophisticated sound." A third was added in 2008: "Unpolished, amateurish, or technologically unsophisticated, esp. as a deliberate aesthetic choice."<ref>{{cite thesis |last= Harper|first=Adam |date=2014 |title=Lo-Fi Aesthetics in Popular Music Discourse |type=PDF |publisher= [[Wadham College]]|url=https://ora.ox.ac.uk/objects/uuid:cc84039c-3d30-484e-84b4-8535ba4a54f8/datastreams/THESIS01 |access-date=March 10, 2018|pp=7–11}}</ref>

==<span id="scimodsim"></span> Scientific modelling and simulation==
In the fields of [[scientific modelling]] and [[simulation]], fidelity refers to the degree to which a model or simulation reproduces the state and behaviour of a real world object, feature or condition. Fidelity is therefore a measure of the realism of a model or simulation.<ref name=SISO/> Simulation fidelity has also been described in the past as "degree of similarity".<ref name=HaysSinger/> In quantum mechanics and optics,<ref>{{Cite journal|last=Bowman|first=D.|last2=Harte|first2=T. L.|last3=Chardonnet|first3=V.|last4=Groot|first4=C. De|last5=Denny|first5=S. J.|last6=Goc|first6=G. Le|last7=Anderson|first7=M.|last8=Ireland|first8=P.|last9=Cassettari|first9=D.|date=2017-05-15|title=High-fidelity phase and amplitude control of phase-only computer generated holograms using conjugate gradient minimisation|url=https://www.osapublishing.org/abstract.cfm?uri=oe-25-10-11692|journal=Optics Express|language=EN|volume=25|issue=10|pages=11692–11700|arxiv=1701.08620|doi=10.1364/OE.25.011692|issn=1094-4087|bibcode=2017OExpr..2511692B|pmid=28788742}}</ref> the fidelity of a field is calculated as an [[Orbital overlap|overlap integral]] of the field of interest with a reference or target field.

==Program evaluation==
In the field of [[program evaluation]], the term fidelity denotes how closely a set of procedures were implemented as they were supposed to have been. For example, it is difficult to draw conclusions from a study about formative assessment in school classrooms if the teachers are not able or willing to follow the procedures they received in training.<ref name=ODonnell/>

==Translation==
{{main|Translation#Fidelity and transparency}}

In [[translation]], ''fidelity'' is the extent to which a translation accurately renders the [[Meaning (linguistics)|meaning]] of the source text, without distortion. It is contrasted with ''transparency'', which is the extent to which a translation appears to a native speaker of the target language to have originally been written in that language.

== See also ==
{{Wikiquote}}
*{{annotated link|[[Classism]]}}
*[[Erik Erikson#Erikson's theory of personality|Erikson's theory of personality]] – Erikson's fidelity is the ability to commit to others and acceptance of others
*{{annotated link|[[Infidelity]]}}
*{{annotated link|[[Knighthood]]}}
*{{annotated link|[[Monasticism]]}}
*{{annotated link|[[Rankism]]}}

== References ==
{{Reflist|refs=
<ref name=SISO>{{cite web |url=http://www.sisostds.org/ProductsPublications/ReferenceDocuments.aspx |title=SISO-REF-002-1999: Fidelity Implementation Study Group Report |publisher=Simulation Interoperability Standards Organization |year=1999 |access-date=January 2, 2015}}</ref>
<ref name=HaysSinger>{{cite book |author=Hays, R. T. |author2=Singer, M. J. |title=Simulation fidelity in training system design: Bridging the gap between reality and training |publisher=Springer-Verlag |year=1989}}</ref>
<ref name=ODonnell>{{cite journal |title=Defining, Conceptualizing, and Measuring Fidelity of Implementation and Its Relationship to Outcomes in K–12 Curriculum Intervention Research |last=O'Donnell |first= Carol L.|year=2008 |journal=Review of Educational Research |volume=78 |issue=1 |pages=33–84 |doi= 10.3102/0034654307313793 }}</ref>
}}

{{Virtues}}

{{Authority control}}

[[Category:Concepts in ethics]]
[[Category:Semantics]]

Vero - Wikipedia - User contributions [en]

Fidelity