Acoustic and articulatory differences between spoken and shouted vowels were analyzed for two male and two female subjects by means of acoustic recordings and midsagittal magnetic resonance images of the vocal tract. In accordance with previous acoustic findings, the fundamental frequencies, intensities, and formant frequencies were all generally higher for shouted than for spoken vowels. The harmonics-to-noise ratios and H1-H2 measures were generally lower for shouted vowels than for spoken vowels. With regard to articulation, all subjects used an increased lip opening, an increased jaw opening, and a lower tongue position for shouted vowels. However, the changes of vertical larynx position, uvula elevation, and jaw protrusion between spoken and shouted vowels were inconsistent among subjects. Based on the analysis results, a perception experiment was conducted to examine how changes of fundamental frequency, subglottal pressure, vocal tract shape, and phonation type contribute to the perception of stimuli created by articulatory synthesis as being shouted. Here, fundamental frequency had the greatest effect, followed by vocal tract shape and lung pressure, with no measurable effect of phonation type.

通过声音记录和声道中矢状核磁共振图像分析了两个男性和两个女性受试者的口语和喊叫元音之间的声学​​和发音差异。根据以前的声学发现，大声喊叫的基本频率，强度和共振峰频率通常都比口语元音高。喊声元音的谐波噪声比和H1-H2度量通常比口语元音低。关于关节，所有受试者对呼喊的元音都使用增加的嘴唇张开，增加的下巴张开和较低的舌头位置。然而，受试者的口语和呼喊元音之间的垂直喉部位置，小舌抬高和下颌突出的变化并不一致。根据分析结果，进行了知觉实验，以检查基本频率，声门下压力，声道形状和发声类型的变化如何对被发音的关节合成产生的刺激产生知觉。在这里，基频影响最大，其次是声道形状和肺压力，而发声类型则没有可测量的影响。