痉挛性发声困难可分成内收型和外展型二类。外展型的特点是嗓音有中度到重度的漏气,且伴有音调的突然下降。作者对二例进行了声学和气体动力学的研究,并讨论了发声疗法对它的疗效。例一是51岁女性,主诉“失声”,音调突然下降,漏气,讲话吃力,音质明显变化已有十年,近二年来加剧。谈话时约每隔2、3个字音调和发声就有一次“破裂”,但发怒、笑或大声讲话时,则有所改善。真、假声带来见异常,发声时声门有1～2mm的裂隙,但偶能关闭。经用窄带语图(带宽45赫)测定元音“a”,发现其基频明显地比正常人高(365.3±14.9赫),频谱中可 Spasmodic dysphonia can be divided into adduction type and abduction type two. Abduction type is characterized by moderate to severe voice leak, and accompanied by a sudden drop in tone. The authors performed acoustic and aerodynamic studies on two cases and discussed the efficacy of acoustic therapy on it. The first case is a 51-year-old woman who complains of “aphasia”, a sudden drop in tone, a leak, difficulty in speaking, a clear change in sound quality for ten years or more in the past two years. There was a “break” every two or three words of pitch and voice during conversations, but an improvement was made when talking and laughing or speaking aloud. True, fake sound to see the exception, sound when the door has a 1 ~ 2mm cracks, but even able to close. The vowel “a” was determined by narrowband speech (bandwidth 45 Hz) and found that its fundamental frequency was significantly higher (365.3 ± 14.9 Hz) than normal