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Coup de glotte
Coup de glotte or 'shock of the glottis' is a term used in the theory of singing technique to describe a particular method of emitting or opening a note by an abrupt physical mechanism of the glottis (the space between the vocal folds). During the 19th century there was disagreement among teachers and performers as to whether the technique should be taught as a normal part of vocal method or not. The technique is still sometimes used to achieve particular effects, dramatic or ornamental, but is usually avoided in the teaching of fundamental vocal method.
== Tone production and vocal 'attack' ==
Vocal sound is produced by a column of air passing from the lungs through the larynx while the vocal cords or ligaments are drawn together, leaving narrow spaces through which the air passes in short, rapid pulsations or vibrations. The discipline of training aims to remove all rigidity and strain in the throat while governing the maximum economy of the ratio of breath to tone produced, so that a relaxed and pure tone may float freely on the breath, supported by the trained and elastic pressure of the diaphragm upon the lungs.
When singing a note, it is desirable that the release of breath and the attack of the tone should occur simultaneously and without artifice. When beginning on a vowel, with no added consonant to mask the start of the note, one can hear if there is any undesirable emission of breath or aspirate (Ha) ''before'' the production of tone. If the voice is correctly produced the union of tone and breath should be spontaneous, but if it is not, this fault will apply to every note produced even when the effect is masked by a consonant, and will form a basic (and vocally destructive) flaw in the vocal method.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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