2) The sound waves travel into your body and hit a boundary between tissues (e.g. between fluid and soft tissue, soft tissue and bone). 3) Some of the sound waves get reflected back to the probe, while some travel on further until they reach another boundary and get reflected. 4) The reflected waves are picked up by the probe and relayed to the machine. 5) The machine calculates the distance from the probe to the tissue or organ (boundaries) using the speed of sound in tissue (5,005 ft/s…
that makes sound waves to produce or record a picture of the internal organs. Sonography is an important medical field because it allows technicians and physicians to see and diagnose a patient’s condition in a minimally intrusive way. What once may have required exploratory surgery now is a quick outpatient procedure with minimal patient discomfort. Ultrasound works by using a high rate of sound waves and echoes: it’s like echolocation which some animals use to find objects by sound. An…
If your recordings are distorting with that awful digital clipping that sounds like a garden rake scraped across a chalkboard, I am not likely to your recording skills very seriously. When initially setting the input gain to your recorder, keep in mind that most vocalists get a bit more excited as they warm up, and they begin…
Noise can cause permanent hearing loss at chronic exposure levels of at least 85 dB or higher for an eight hour period (Peter M. Rabinowitz, Pg.1). The louder the sound, the shorter the time period before NIHL can occur. Sounds of less than 75 decibels, even after long exposure, are unlikely to cause hearing loss (Hearing Health Foundation 2015). Hearing loss that is caused by the noise exposure due to recreational or non-occupational activities is termed socioacusis. Hearing loss due to…
Acoustic reflexes are contractions of the stapedius muscle in the middle ear. This reflex occurs when a loud sound is presented to the ear causing the tympanic membrane to stiffen and cause a change in immittance (Martin & Clark, 2012). When measuring the acoustic reflex threshold, we are measuring the softest sound that can cause a reflex of the stapedius muscle as well as the duration of time needed for the reflex to decay. The reflex is presented as a deflection, or a curve/dip, on the…
a live production, or if you are watching a recital through a computer screen. The performances both include very unique uniforms, scenery, dancers, and music timbre. But what you miss out on when watching a recording, is hearing the live gamelan sounds flood around you and all the energy in the concert hall. Over all, I prefer the live version. The melodies in both versions have very large ranges due to the various instruments. Each type of instrument plays their own rhythm and when layered…
is the breath that supports the sound, the power source involves the lungs, diaphragm, trachea and core muscles. By correctly…
ability to play even higher, or lower. The trumpet is capable of playing these pitches because of the acoustic principles and mechanical construction. Vibrations Vibrations are the basis for the trumpet sound. The trumpet player creates vibrations by pressing his lips together to create a buzzing sound. Trumpeters can buzz specific pitches by creating additional pressure with the lips and concentrating the airflow by keeping the cheeks tucked in. By increasing the speed of the vibrations the…
piece when the entire brass or the woodwind section would come together on rhythms and play chords together creating a fool smooth sounds that glided over the audience. However, though this piece may have sounded easy and laid…
ear called the cochlea, which is lined with little hair cells. Sound waves are transmitted by the external ear, through the center ear, to the internal ear. In the internal ear, the sound wave weight moves the hair cells, which then send messages to the mind, through the sensory system, about the sounds heard by the ear. High clamor levels will harm the hair cells in the inward ear and decrease the capacity of the ear to "listen" sounds and transmit the data to the cerebrum. Once the hair cells…