Loudness, a subjective measure, is often confused with physical measures of sound strength such as sound pressure, sound pressure level (in decibels), sound intensity or sound power. More modern standards, such as Nordtest ACOU112 and ISO/AWI 532-3 (in progress) take into account other components of loudness, such as onset rate, time variation and spectral masking. Others, such as ISO 532A (Stevens loudness, measured in sones), ISO 532B ( Zwicker loudness), DIN 45631 and ASA/ANSI S3.4, have a more general scope and are often used to characterize loudness of environmental noise. Some definitions, such as ITU-R BS.1770 refer to the relative loudness of different segments of electronically reproduced sounds, such as for broadcasting and cinema. In different industries, loudness may have different meanings and different measurement standards. The study of apparent loudness is included in the topic of psychoacoustics and employs methods of psychophysics. The relation of physical attributes of sound to perceived loudness consists of physical, physiological and psychological components. More formally, it is defined as the "attribute of auditory sensation in terms of which sounds can be ordered on a scale extending from quiet to loud". In acoustics, loudness is the subjective perception of sound pressure. The horizontal axis shows frequency in Hz For the Japanese band, see Loudness (band).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |