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Voiceless glottal fricative

The voiceless glottal fricative, symbolized as in the International Phonetic Alphabet (IPA), is a consonantal sound produced by airflow passing through the glottis—the opening between the vocal folds—without vibration of the folds, generating turbulent noise akin to a breathy release.^[1] This articulation occurs at the glottal place of articulation and is categorized as a fricative due to the partial obstruction creating friction, though it is sometimes debated whether it functions as a true consonant or merely a transitional element in speech.^[2]^[3] In phonology, the voiceless glottal fricative often patterns as a consonant but can exhibit approximant-like qualities in some languages, lacking the intense turbulence of other fricatives like or . It is voiceless by definition, with the vocal folds held apart to allow uninterrupted airflow, distinguishing it from its voiced counterpart [ɦ], which involves partial vibration.^[2] This sound is common in the world's languages, occurring in approximately 56% of documented inventories according to the PHOIBLE database,^[4] and serves roles such as syllable onset or aspiration marker. Notable examples include English ("hat" pronounced [hæt]), where it contrasts phonemically, and German, where it typically initiates stressed syllables.^[3] In some contexts, such as intervocalic positions, it may undergo voicing or deletion, reflecting its phonetic variability across dialects and languages.^[5]

Phonetic Properties

Articulation and Physiology

The voiceless glottal fricative, represented in the International Phonetic Alphabet as , is articulated at the glottis with the vocal folds held apart and abducted, preventing vibration and resulting in a voiceless sound.^[6] This configuration creates turbulent airflow through the narrowed but not fully closed glottis, producing a characteristic aspiration noise from the friction of air passing over the vocal folds.^[7] Unlike consonants with supraglottal constrictions, involves no obstruction in the oral or pharyngeal regions, allowing the airstream to flow freely from the glottis to the lips.^[8] The sound employs a pulmonic egressive airstream mechanism, in which air is pushed outward from the lungs by the action of the diaphragm and intercostal muscles through the open vocal tract.^[7] This mechanism is standard for the majority of speech sounds, including , and contrasts with non-pulmonic airstreams such as glottalic or velaric ones. Physiologically, production of resembles a forceful exhalation without phonation, akin to sighing or heavy breathing, where the glottal opening generates mild turbulence without significant resistance elsewhere in the tract.^[6] Due to the absence of any supraglottal narrowing, the timbre of is heavily influenced by adjacent vowels, often mirroring the spectral qualities of the following vowel and imparting a breathy onset to it.^[8] For instance, in English words like "hat" [hæt], the takes on a quality similar to a voiceless, breathy version of the subsequent low front vowel /æ/, facilitating smooth transitions in syllable-initial positions.^[7] This vowel-like coloring arises because the vocal tract filter remains largely unchanged from the ensuing vowel articulation.^[6] Although categorized as a fricative based on the presence of glottal turbulence, generates comparatively minimal airflow disruption relative to sibilant fricatives such as or [ʃ], which involve stronger supraglottal constriction and higher noise levels.^[7] Consequently, its acoustic output often borders on approximant-like, with weaker friction that can render it perceptually transitional rather than distinctly obstructive.^[6]

Acoustic Characteristics

The voiceless glottal fricative /h/ exhibits spectral properties characterized by the absence of distinct formants, relying instead on transitional formant patterns that align with the adjacent vowel's resonances, overlaid with diffuse low-intensity noise spanning a broad frequency range. On spectrograms, this manifests as faint, irregular banding corresponding to the voiceless counterpart of the neighboring vowel's formants, interspersed with weak turbulent noise rather than concentrated frication energy.^[9]^[10] In terms of duration and intensity, /h/ is typically brief, lasting 50-100 ms in intervocalic positions, with amplitude notably lower than that of surrounding vowels—often around -14 dB normalized RMS. Turbulence noise, when present, tends to peak in the 1-4 kHz range in certain contexts, though overall frication remains minimal and less intense than in other voiceless fricatives. For instance, acoustic analyses of Arabic /h/ report an average duration of approximately 99 ms and a spectral mean of 2.5 kHz, underscoring its subdued energy profile compared to sibilants like /s/.^[11] Perceptually, /h/ is cued more by its contextual integration and the subtle "coloring" it imparts to vowels via formant perturbations than by prominent noise, as its acoustic footprint often blends with vocalic elements. In languages like Arabic, these formant displacements—such as lowered F2 values around 1.6 kHz at vowel onset—are more pronounced, reflecting stronger glottal influence than in English, where /h/ functions primarily as a low-energy transitional bridge with minimal disruption. Similarly, in Hebrew, realizations of /h/ show clearer shifts in F1 and F2 frequencies in non-elided contexts, distinguishing them from the more vowel-like blending observed in English. Experimental spectrographic studies consistently depict /h/ as a sparse, low-amplitude interval between vowels, with negligible frication in neutral articulations, emphasizing its role in vowel-to-vowel transitions over independent noise generation.^[11]^[12]^[13]

Notation

IPA and Historical Development

The symbol /h/ for the voiceless glottal fricative was introduced in the first version of the International Phonetic Alphabet (IPA) in 1888 by the International Phonetic Association, appearing as a provisional symbol (marked with an asterisk) to represent a laryngeal sound in early charts published in Le Maître Phonétique.^[14] This notation derived from the Latin letter "h," which historically represented the aspirate sound in ancient Greek, as transliterated through Etruscan and Roman scripts to denote the rough breathing (spiritus asper).^[15] In 19th-century phonetic transcriptions preceding the IPA's formalization, linguists such as Henry Sweet and Otto Jespersen employed "h" to denote breathy or aspirated sounds, influenced by Sweet's Romic alphabet, which adapted Roman letters for broad phonetic representation without diacritics. Sweet described the sound as arising from open glottal emission with minimal friction, while Jespersen used "h" in his articulatory analyses of speech sounds, including English and Danish examples, to capture its continuant quality. The symbol /h/ was distinguished from the glottal stop /ʔ/, which involves complete vocal fold closure, and the voiced glottal fricative /ɦ/; its selection emphasized the fricative turbulence at the glottis, though debates persisted on whether /h/ qualifies as a true fricative or better as a voiceless approximant due to variable supraglottal coloration. Early 20th-century phonetic works, such as Daniel Jones's English Pronouncing Dictionary (1917), recognized /h/ as a glottal continuant in transcriptions of Received Pronunciation, positioning it as a voiceless fricative at the syllable onset. Global standardization advanced through IPA revisions, with the 1989 Kiel Convention (published in the 1993 handbook) reinstating and [ɦ] in the pulmonic consonant chart after earlier removals, confirming their fricative status despite proposals to reclassify them as approximants. The 2020 revision of the IPA chart retained /h/ without alteration, solidifying its use across languages for the voiceless glottal fricative.^[16]

Diacritic Variations

The voiceless glottal fricative can be modified using diacritics in narrow phonetic transcriptions to capture subtle articulatory or phonatory variations, as outlined in the International Phonetic Alphabet (IPA). These modifications are applied based on the degree of glottal constriction, airflow turbulence, or additional phonatory features, rather than as standard representations for all occurrences of /h/.^[17] To indicate stronger fricative turbulence, the raising diacritic is used, transcribed as [h̝] or [h˔], denoting increased glottal constriction for emphatic or intensified realizations. This notation highlights contexts where the sound approaches a more robust fricative quality, such as in emphatic speech patterns across various languages. For weaker, approximant-like realizations with reduced turbulence, the lowering diacritic produces [h̞] or an alternative transcription as [ə̯], reflecting transitional or glide-like articulations. This is common in intervocalic positions in languages like English, where the sound may lack strong frication and function more as a voiceless approximant between vowels.^[17] Nasalized variants are represented by [h̃], indicating airflow through the nasal cavity alongside glottal frication. Such realizations occur in languages like Pirahã, where the glottal fricative induces nasalization, and Lisu, featuring a nasalized glottal fricative with distinct acoustic properties like higher spectral variance.^[18]^[19] Additional modifiers include the breathy voice diacritic [h̤], used for partially breathy or murmured phonation while remaining voiceless. This appears in Bantu languages such as Kwangali and Mbukushu, where [h̤] contrasts with plain and involves a wider glottal aperture without full voicing. According to the IPA Handbook, these diacritics are selected judiciously to denote phonetic details like constriction degree or phonation type, ensuring precise transcription without overgeneralization to all /h/ instances.^[17]

Linguistic Distribution

Phonemic Status

The voiceless glottal fricative /h/ serves as a distinct phoneme in a wide array of languages, appearing in the consonant inventories of 1,703 languages (56% of those documented) according to the PHOIBLE 2.0 database.^[4] It is frequently unpaired in these inventories, lacking a systematic voiced counterpart /ɦ/, and occupies the glottal place of articulation slot in consonant charts, often alongside the glottal stop /ʔ/ but without merger.^[4] This phonemic status enables /h/ to contrast meaningfully with other sounds, particularly in initial positions where it is most stable and frequent across languages, though word-final occurrences are rarer and sometimes restricted or lost in casual speech.^[20] In Semitic languages, /h/ plays a key role in distinguishing lexical roots through contrasts with related gutturals. For instance, in Arabic, /h/ contrasts with the glottal stop /ʔ/ and the voiceless pharyngeal fricative /ħ/, as evidenced by minimal pairs such as /ħasan/ 'beautiful' (from root ḥ-s-n) versus /hasan/ 'good' (from root h-s-n).^[12]^[21] These distinctions are phonemically robust across word positions, though /h/ is most contrastive initially and medially in root-based morphology. In Hebrew, /h/ maintains phonemic independence within the guttural series, contrasting with pharyngeals like /χ/ or /ħ/ (historically from ḥet) and the approximant from ayin /ʕ/, as in pairs distinguishing roots such as /ḥet/ 'sin' versus forms without the pharyngeal but with /h/ in intervocalic contexts; modern realizations preserve this in careful speech despite occasional reduction.^[22]^[23] Among Indo-European languages, English exemplifies /h/'s phonemic role through initial contrasts, such as "hat" /hæt/ versus "at" /æt/, where its absence alters word identity; /h/ is strictly word-initial in this inventory, unpaired and non-contrastive elsewhere.^[24] In German, /h/ functions phonemically as an initial aspirate, distinguishing words like "Haus" /haʊs/ 'house' from hypothetical non-/h/ forms, though it patterns as a fricative limited to syllable onsets.^[25] Hindi-Urdu includes /h/ phonemically, often realized voiceless initially as in "ham" /həm/ 'we' contrasting with non-/h/-initial words like "am" /əm/ (from Sanskrit roots), though it may voice to [ɦ] intervocalically. (Note: Secondary source for broad inventory; primary contrasts from root etymologies.) Non-Indo-European examples further illustrate /h/'s phonemic versatility. Japanese treats /h/ as a core phoneme in its small consonant inventory, occurring initially in native morphemes (e.g., /hana/ 'nose') and loanwords, contrasting with zero in vowel-initial forms.^[26] In Shanghainese (a Wu Chinese variety), /h/ is phonemically distinct from its voiced counterpart /ɦ/, with contrasts whose realizations vary by tone (voiceless in high tones, voiced in low tones).^[27] Additional languages with phonemic /h/ include Adyghe (Northwest Caucasian, initial contrasts in a rich fricative series), Albanian (Indo-European, word-initial /h/ from Latin loans), and Danish (Germanic, phonemic /h/ in aspirated onsets like "hus" 'house'). These cases highlight /h/'s frequent initial positioning and role in lexical differentiation, in numerous additional languages.^[4]

Allophonic and Dialectal Variations

In English, the voiceless glottal fricative /h/ undergoes allophonic deletion in casual speech, particularly in intervocalic and unstressed positions, such as the realization of "ahead" as [əˈwɛd] rather than [əˈhɛd]. This process, known as h-dropping, is more prevalent word-initially before vowels and serves as a marker of informal or dialectal speech styles.^[28] Dialectal variations in the realization of /h/ appear across English varieties; for instance, in Scottish English, /h/ is typically retained with a more robust fricative quality compared to southern British dialects where deletion is common. This stronger articulation in onset positions distinguishes Scottish realizations from those in urban southern varieties.^[29] In Spanish, the phoneme /x/ (as in "jota") exhibits dialectal allophonic variation, realized as in Caribbean varieties, leading to pronunciations like [ˈhota] in Puerto Rican and Cuban Spanish. This glottal aspiration reflects Andalusian influence and contrasts with the velar in peninsular and highland Latin American dialects.^[30] Japanese /h/ shows vowel-dependent allophony, assimilating in place of articulation to the following vowel; for example, it surfaces as the palatal fricative [ç] before /i/, as in "hito" [çito] 'person'. This coarticulatory variation maintains the voiceless fricative manner while adapting to high front vowels.^[31] Although French lost its historical /h/ phoneme centuries ago, allophonic glottal transitions can occur in liaison contexts, where a non-smooth juncture resembling a brief -like pause marks h-aspiré words, blocking full consonant linking (e.g., "les héros" [le e.ʁo]). This subtle realization preserves word boundaries without a full fricative.^[32] Other allophonic realizations include nasalized variants like [h̃] in languages such as Krim, where /h/ nasalizes before nasal vowels or consonants, creating a breathy nasal airflow. In some Slavic dialects, the voiced counterpart /ɦ/ devoices to in final position due to word-final devoicing rules, as seen in certain Czech and Slovak varieties. Geographically, the voiceless glottal fricative is absent in many Australian languages, such as those of the Pama-Nyungan family, where glottal sounds are rare. However, per the UPSID database, it appears in over 70% of sampled world languages, underscoring its widespread allophonic adaptability.^[33]

Phonological Behavior

Fricative or Approximant Nature

The classification of the voiceless glottal fricative /h/ as either a true fricative or an approximant has been debated in phonetic literature, originating with Peter Ladefoged's 1975 analysis, which contended that /h/ lacks the sustained frication noise characteristic of other fricatives and instead functions more like a voiceless approximant or a transitional element toward the following vowel.^[34] This perspective highlights /h/'s production without oral constriction, resulting in minimal turbulence beyond the glottis, often resembling a devoiced version of an adjacent vowel.^[35] Supporting its fricative status, phonetic evidence from emphatic varieties in Arabic demonstrates glottal turbulence and periodic noise bursts during /h/ production, consistent with fricative aerodynamics.^[36]^[37] The International Phonetic Association classifies /h/ as a fricative based on its manner of articulation involving airflow friction at the glottis. Counterarguments emphasize the lack of supraglottal constriction, prompting reclassifications of /h/ as a glottal approximant, sometimes notated as [ʰə], that primarily serves to fill hiatus between vowels rather than acting as a robust consonant.^[38]^[37] Its infrequent occurrence in consonant clusters across languages underscores this approximant-like behavior, as /h/ rarely participates in complex onsets or codas due to its weak articulatory independence.^[39] Cross-linguistic variation further complicates the debate: in Hebrew, /h/ produces noticeable formant displacement in adjacent vowels, evidencing fricative-like consonantal influence, whereas in English, it typically imparts vowel coloring through aspiration without prominent frication noise, reinforcing its approximant qualities.^[13]^[40] These classificatory ambiguities impact phonological analyses, particularly regarding /h/'s viability as a syllable onset; in Optimality Theory frameworks, /h/ is often deemed a non-prototypical consonant, subject to constraints that limit glottal segments in onset positions or treat them as featurally underspecified elements prone to deletion in hiatus resolution.^[41]^[42]

Interactions with Other Sounds

The voiceless glottal fricative /h/ frequently emerges through historical sound changes, such as the lenition of sibilants or the resolution of vowel hiatus. In various Indo-European languages, /h/ derives from earlier *s in intervocalic or initial positions. Additionally, /h/ often arises as an epenthetic element to break vowel hiatus, inserting between adjacent vowels to prevent sequences like V#V, a process documented in languages such as Modern Greek where h-insertion repairs potential hiatus in compounds or derivations.^[43] Conversely, /h/ undergoes loss in many lineages, notably in Romance languages where the sound, inherited from Latin, became silent by late Vulgar Latin and disappeared entirely, leading to modern French's h muet in words like hiver (from Latin hiems), pronounced [ivɛʁ] without glottal friction.^[44] In terms of co-articulation, /h/ influences adjacent vowels through carryover effects on phonation, often imparting breathy voice quality to the preceding or following segment due to glottal spreading. For instance, the voiceless airflow of /h/ can induce breathiness on the preceding vowel via anticipatory or perseverative coarticulation, as observed in breathy vowel systems derived historically from /Vh/ sequences in languages like Gujarati, where the glottal frication spills over to create non-modal phonation.^[45] In connected speech, /h/ frequently deletes before vowels, a phenomenon known as h-dropping prevalent in many English dialects, such as Cockney and working-class varieties in southern England, where initial /h/ in words like hand surfaces as [ænd] in unstressed or casual contexts, conditioned by prosodic weakening.^[46] Phonologically, /h/ serves as a marker of aspiration in Indo-Aryan languages, particularly in post-aspirated stops where the release involves a voiceless glottal fricative-like phase, distinguishing voiceless aspirates /pʰ tʰ kʰ/ from unaspirated /p t k/ in Hindi; for example, phəl [pʰəl] 'fruit' features prolonged glottal spreading post-release, contrasting with pəl [pəl] 'moment'.^[47] In Arabic, /h/ contrasts sharply with the glottal stop /ʔ/, maintaining distinct roles in consonant clusters; /h/ allows free airflow with frication at the glottis, as in huna [huna] 'here', while /ʔ/ involves complete closure, as in ʔana [ʔana] 'I', preventing vowel elision in emphatic or pharyngeal contexts.^[48] Syllabically, /h/ predominantly occupies onset positions across languages, rarely appearing in codas where it tends to delete due to sonority constraints or positional markedness. In German, for instance, /h/ in potential coda sites, such as the historical form sah (from sehen), realizes as [zaː] with /h/-deletion, preserving syllable structure by avoiding low-sonority codas and aligning with final devoicing rules. Comparatively, /h/ often contrasts with its voiced counterpart /ɦ/ in languages like Bengali, where /h/ maintains voiceless frication in initial positions (e.g., hawa [hawa] 'air') while /ɦ/ appears intervocalically as a breathy approximant (e.g., baha [baɦa] 'flow'), reflecting a phonemic distinction tied to aspiration in the stop system. Evolutionarily, /h/ frequently paths to zero in Romance languages through progressive weakening, as in the shift from Latin homo to French homme [ɔm], where glottal friction eroded entirely by the medieval period, influencing liaison rules and vowel elision.^[47]^[44]

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### Summary of Voiceless Glottal Fricative [h]
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### Summary of IPA Chart Content
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[51]
[PDF] The Phonology and Phonetics of Laryngeal Stop Contrasts in ... - MIT
This fact led Ladefoged (1975) to propose that voiced aspirates are murmured sounds: produced with one portion of the glottis open during stop closure and ...
[52]
[PDF] the phonetic correlates of pharyngealization and - IDEALS
The major articulatory differences between plain and pharyngealized speech sounds in Arabic are ... except the set of pharyngeals /ɦ, ʕ, h, ʔ/, effectively blocks ...
[53]
[PDF] The distribution of aspirated stops and /h/ in American English and ...
The optimality-theoretic analysis that we offer would readily account for their distribution even if we assume that. [spread glottis] is underlyingly present on ...