🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiSvenskaРусскийفارسی한국어中文日本語EntityQ1498677· pop 14· linked from 552 articlesequal-loudness contourfrequency characteristics of hearing and perceived volumeAvailable in 14 languagesEspañolFrançaisDeutsch日本語ItalianoCatalanGalicianPolskiSlovakSvenskaUkrainianConnectionsISO 0070EntityISO 31EntityCategoriesAcousticsAudio engineeringISO standardsPsychoacousticsSound