perceived noise level
61Psychoacoustics — is the study of subjective human perception of sounds. Alternatively it can be described as the study of the psychological correlates of the physical parameters of acoustics. Background Hearing is not a purely mechanical phenomenon of wave… …
62Sound localization — refers to a listener s ability to identify the location or origin of a detected sound in direction and distance. It may also refer to the methods in acoustical engineering to simulate the placement of an auditory cue in a virtual 3D space (see… …
63Sound — This article is about audible acoustic waves. For other uses, see Sound (disambiguation). In a drum sound is produ …
64Equal-loudness contour — An equal loudness contour is a measure of sound pressure (dB SPL), over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones. The unit of measurement for loudness levels is the phon, and …
65MPEG-1 — Moving Picture Experts Group Phase 1 (MPEG 1) Filename extension .mpg, .mpeg, .mp1, .mp2, .mp3, .m1v, .m1a, .m2a, .mpa, .mpv Internet media type audio/mpeg, video/mpeg Developed by ISO, IEC Type of format audio, vid …
66Tinnitus — Infobox Disease Name = Tinnitus Caption = DiseasesDB = 27662 ICD10 = ICD10|H|93|1|h|90 ICD9 = ICD9|388.3 ICDO = OMIM = MedlinePlus = 003043 eMedicineSubj = ent eMedicineTopic = 235 MeshID = D014012Tinnitus (pronEng|tɪˈnaɪtəs or IPA|/ˈtɪnɪtəs/,… …
67United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …
68Life Sciences — ▪ 2009 Introduction Zoology In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… …
69motion-picture technology — Introduction the means for the production and showing of motion pictures. It includes not only the motion picture camera and projector but also such technologies as those involved in recording sound, in editing both picture and sound, in… …
70Definition of music — How to define music has long been the subject of debate; philosophers, musicians, and, more recently, various social and natural scientists have argued about what constitutes music. The definition has varied through history, in different regions …
