Flashcards in Auditory, Tactile, and Vestibular System (chapt. 5) Deck (15):
Any sudden mechanical movements sets up fluctuation in air. the frequency of a sound is the number of fluctuations or vibration per sound, expressed in hertz (HZ) intensity of sound is measured by logarithmic unit called decibel
the wavelength of sound is the distance between analogous points of two successive waves.
in audio, the number of repeating cycles of change in air pressure or oscillation in voltage, that occur in one unit ofttimes usually a second. Complex sounds are made up of many pure tones of different frequencies
Sounds and Noise
using sounds in design alarms, voice activated devices, protection of ears from dangerous sound, noise
the SI unit of frequency in particular the number of times something occurs in one second, abbreviated Hz. Named after Heinrich Rudolph hertz.
a ratio based measure of the comparative amount of some quality usually sound level power of voltage , relative to some reference amount. Is a logarithmic unit that describes a ratio of two measurements.
the range of frequencies which can be experienced by an average human being. The range is defined as 20 HZ to 20 KHZ for convince but in practice, is realistically closer to 20 Hz to 17 Khz. Dolphins are believed to hear up to 70 Khz
human ear sensitive to sounds in the frequency range of 16 to 20,000 Hertz below 16 Hz infrasonic above 20,000 ultrasonic greatest sensitivity lies in the range of 2000-5000 Hertz
convey specific information, as basis for communication between individuals. As an alarm system and understanding of speech.
Criteria for alarms system
the alarm must be heard, not be above the danger level, not be overlay starling or abrupt, not disrupt perceptual understanding of the other signals, be informative, signaling the nature of emergency
voice alarms and meaningful sounds false alarms
less suited for spatial location
speech signal,mask effect, speech communication,speech distortions
noise is any disturbing sound
physiological stress from noise, raising blood pressure,acceleration of heart rate,contraction of the blood vessels of the skin, increase in metabolism,slowing down of the digestive organs,increase muscular tension
high frequencies (above 2,000 HZ)