LIN323H1 Lecture Notes - Root Mean Square, Hearing Loss, Threshold Of Pain
Document Summary
Frequency: the number of complete cycles or vibrations existing in one second (hz) Pitch: the subjective auditory property of a sound that enables a listener to place the sound on a scale going from low to high without considering the acoustic properties of the sound. Supersonics: sounds that are above normal hearing range (>12 khz, e. g. mosquito device that emits an 18000 hz signal is audible to an 18 year old but not to a 50 year old. Subsonics: sounds that are below normal hearing range (<20 hz, can cause discomfort (headaches, influence on speech, chest pains, urge to urinate, etc. ) Frequency range of speech is 100 hz to 12000 hz: only need up to 4000 hz to correctly identify speech under normal hearing. Characteristics of low-frequency sounds: long wavelengths, good transmission in air, difficult to reflect or attenuate. Characteristics of high-frequency sounds: short wavelengths, poor transmission in air, easily reflected or attenuated.
