However, the A‑weighted scale had disadvantages: it gave large errors in assessing the loudness levels of tonal, pulsed, and predominantly low-frequency noise, and was unsuitable for measuring peak sound pressure level (SPL) values. This international standard (ISO-226) was modified in 2003 and introduced in Russia in 2009. Such a scale was introduced in 1961, making it possible to estimate the loudness level of perceived noise. The traditional way of assessing the annoying effect of noise is to determine its level on an A-weighted decibel scale. Noise is defined as audible sound that disrupts silence and causes annoyance. This paper compares different methods for assessing the annoyance caused by noise recorded in Moscow subway cars. The resulting model helps to identify the causes of annoyance (subjective annoying qualities) develop work plans aimed at noise suppression, the formation of pleasant noise by machines and mechanisms and control changes in the rank of annoyance in the implementation of such plans. Another method for evaluating PAA includes conducting an auditory examination and constructing a mathematical model that relates the rank of auditory annoyance to the measured subjective qualities of the noise. Taking such qualities into account, a metric of short-term psychoacoustic annoyance (PAA) has been proposed, which is valid for many types of noise. Units of measurements have been defined for these and calculation methods developed. Annoyance, in addition to loudness, is caused by such subjective noise qualities as sharpness, roughness, fluctuation strength, tonality, etc. The existence of noise reduction limits and their informational significance have led to other methods for assessing noise annoyance. However, the A-weighted scale is inapplicable for analyzing tonal, pulsed, and predominantly low-frequency noise therefore, methods have been developed for calculating noise loudness in linear units, sones, which take into account not only auditory sensitivity, but also masking properties and auditory temporal effects. Such annoyance is traditionally assessed by the A-weighted sound pressure level of noise, roughly corresponding to the level of perceived loudness. Our exhibition presents the five most annoying sounds in the world – the same recordings used in the studies – each played over and over again for exactly one minute, beginning with the least annoying and ending with the scientifically determined Most Annoying Sound in the World.Noise is defined as audible sound that disrupts silence and causes annoyance. The amygdalae communicate with other portions of the brain to form emotional responses and memories, but are also believed to be involved in a surprising number of other experiences such as anxiety, social interaction, sexual orientation, alcoholism, post-traumatic stress disorder, and even political orientation. Human reactions of annoyance to sounds is thought to be controlled by the amygdalae, two small, acorn-shaped clusters of nuclei, one located in each hemisphere of the brains of humans and other mammals. The griding sounds proved once again to be the most annoying sounds of the bunch. These types of sounds have been the subject of previous studies of annoyance, but in the 2008 study they were, for the first time, intermixed with other types of sounds including human and animal vocalisations, weather sounds, musical instruments, and machines. Each of the five most annoying sounds is an example of a gride: a grating, grinding, or scraping noise.
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