Kuroda I, Fujiwara O, Okamura N, Utsuki N
Aviat Space Environ Med. 1976 May;47(5):528-33.
Factors inherent in aircraft communication systems hinder customary approaches to voice analysis in the determination of the degree of stress experienced by a pilot during an inflight emergency. By means of a sound spectrogram, the mean vibration space of a voice can be analyzed if the space between the vertical deflections of the vowel sounds is calculated in micrometers. The vibration space shift rate (VSSR) is calculated by comparing the widest vibration space of the voice during the normal phase of the same flight (standard vibration space: SVS) with that encountered during the emergency situation (EVS) by the following formula: VSSR = ((SUS-EVS)/SUS) X 100%. The number of measuring points in each case differs in regard to the length of communication during the emergency. The VSSR can be divided into three phases - normal, urgent, and emergency - each with three grades of 0.5 S.D. apiece.
飞机通信系统中固有的因素阻碍了在确定飞行员在飞行紧急情况中所经历的压力程度时采用常规的语音分析方法。通过声谱图，如果以微米为单位计算元音声音垂直偏转之间的间距，就可以分析语音的平均振动间距。振动间距变化率（VSSR）是通过将同一航班正常阶段语音的最宽振动间距（标准振动间距：SVS）与紧急情况期间遇到的振动间距（EVS）进行比较，按照以下公式计算得出：VSSR = ((SUS - EVS)/SUS) × 100%。每种情况下的测量点数因紧急情况期间通信时长而异。VSSR可分为三个阶段——正常、紧急和危急——每个阶段各有三个标准差等级，每个等级为0.5。
