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  2. Voiced alveolar and postalveolar approximants - Wikipedia

    en.wikipedia.org/wiki/Voiced_alveolar_and_post...

    The voiced alveolar approximant is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet that represents the alveolar and postalveolar approximants is ɹ , a lowercase letter r rotated 180 degrees. The equivalent X-SAMPA symbol is r\.

  3. Reflection (physics) - Wikipedia

    en.wikipedia.org/wiki/Reflection_(physics)

    Reflection of light is either specular (mirror-like) or diffuse (retaining the energy, but losing the image) depending on the nature of the interface.In specular reflection the phase of the reflected waves depends on the choice of the origin of coordinates, but the relative phase between s and p (TE and TM) polarizations is fixed by the properties of the media and of the interface between them.

  4. Phonestheme - Wikipedia

    en.wikipedia.org/wiki/Phonestheme

    A phonestheme (/ f oʊ ˈ n ɛ s θ iː m / foh-NESS-theem; [1] phonaestheme in British English) is a pattern of sounds systematically paired with a certain meaning in a language.The concept was proposed in 1930 by British linguist J. R. Firth, who coined the term from the Greek φωνή phone, "sound", and αἴσθημα aisthema, "perception" (from αίσθάνομαι aisthanomai, "I ...

  5. Consonant voicing and devoicing - Wikipedia

    en.wikipedia.org/wiki/Consonant_voicing_and...

    Initial voicing is a process of historical sound change in which voiceless consonants become voiced at the beginning of a word. For example, modern German sagen [ˈzaːɡn̩], Yiddish זאָגן [ˈzɔɡn̩], and Dutch zeggen [ˈzɛɣə] (all "say") all begin with [z], which derives from [s] in an earlier stage of Germanic, as is still attested ...

  6. Phoneme - Wikipedia

    en.wikipedia.org/wiki/Phoneme

    By contrast, some other sounds would cause a change in meaning if substituted: for example, substitution of the sound [t] would produce the different word still, and that sound must therefore be considered to represent a different phoneme (the phoneme /t/). The above shows that in English, [k] and [kʰ] are allophones of a single phoneme /k/.

  7. Voiced alveolar affricate - Wikipedia

    en.wikipedia.org/wiki/Voiced_alveolar_affricate

    This refers to a class of sounds, not a single sound. There are several types with significant perceptual differences: The voiced alveolar sibilant affricate [d͡z] is the most common type, similar to the ds in English lads .

  8. Room acoustics - Wikipedia

    en.wikipedia.org/wiki/Room_acoustics

    Room acoustics is a subfield of acoustics dealing with the behaviour of sound in enclosed or partially-enclosed spaces. The architectural details of a room influences the behaviour of sound waves within it, with the effects varying by frequency.

  9. Voiced dental, alveolar and postalveolar trills - Wikipedia

    en.wikipedia.org/wiki/Voiced_dental,_alveolar...

    The voiced alveolar trill is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet that represents dental, alveolar, and postalveolar trills is r , and the equivalent X-SAMPA symbol is r. It is commonly called the rolled R, rolling R, or trilled R.

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