Characteristic analysis of screeching noise using 24bit/192 kHz high-resolution measurement system in anechoic room

Abstract

Many researches on the screeching sound have been investigated for some decades. Halpern et al.(1986) reported acoustic evaluation of “chilling sound” as a pioneering study. The screeching sound makes us feel so-called hair-raising, bloodcurdling chills, which is generated by scratching a blackboard and frosted glass with a fingernail, metal, and so on. This might be common sensation shared by the world. Although Halpern et al. (1986) employed a tape recorder of up to 20.0 kHz as a recording equipment, in recent years researchers can use a 24 bit/192 kHz high-resolution measurement system. The frequency range of screeching sound can’t be not fundamentally limited up to 20.0 kHz. Scratching should cause the sound above the human audible range; it is known as “Hypersonic effect.” In this study, therefore, we try to record and analyze the screeching noise at the frequency range of up to 96 kHz. We employ 24 bit/192 kHz high-resolution measurement system in anechoic room as a recording equipment. This presentation reports the findings from characteristic analysis of screeching sound obtained by high-resolution measurement. We demonstrate that scratching generates the sound above 20.0 kHz, and that so-called screeching noise have many overtone sounds above 20.0 kHz and remarkable features of like sawtooth wave.