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AAERT equipment Questions and Answers 100% Accurate
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Exam of 6 pages for the course aaert at aaert (AAERT equipment)
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AAERT equipmentsound - answer is defined as vibrations that can be perceived
microphone - answer converts the acoustical energy that is sound into an electrical
signal that can be delivered to either an analog or a digital device
analog and digital - answer recordings start the same way; with sound
digital mixer or A/D converter - answer to change the analog signal to a digital signal it
will need to pass through an analog to digital converter, commonly referred to as a
sample rate (44.1 khz, 48 khz,etc.)
bit rate (usually 16 or 24 bits) - answer the two most important factors in the quality of
the new digital audio are
low sampling rate - answer approximation
high sampling rate - answer smooth
the bit rate - answerrepresents the amount of information, or detail that is stored per unit
of time of a recording
digital court reporting programs - answersample at a rate fast enough, thousands of
times a second, so speech sounds are smooth and correctly represented
when selecting the microphones that you will use there are several variables: these
variables include - answerMicrophone type (dynamic or condenser)
microphone pick-up pattern
microphone size and stands
microphone cost
for the purpose of digital reporting, AAERT recommends that you slect -
answerdynamic, condenser, or a combination of dynamic and condenser microphones.
Both of these microphone types work in a unique way but can generate a high quality
audio reproduction
dynamic microphones - answer(also called "moving coil" microphones) are made up of
a diaphragm, a coil, and a magnet. As acoustical energy hits against the diaphragm,
which is a flat plate at the front of the microphone, it causes the coil that is attached to it
to move back and forth over top of the magnet . they are bulky
, condenser microphone - answerconsists of a front plate (diaphragm), back plate, and a
48 volt power source. The front and back plate together create a capacitor. wider
assortment of shapes and sizes. one type commonly used is a gooseneck microphone
phantom power - answerwhen acoustical energy hits the front plate of the capacitor, the
distance between the front and back plate changes. the gap between these two plates
is electrically charged. this charge is created by either an internal battery source or an
external power source referred to as ..
aaert does not recommend: - answerthe use of batteries as the supply of this charge. if
a battery would die during use, you could have a gap in your recording and you would
need to interrupt the event you are reporting to fix this problem
most digital mixers and A/D converters - answeract as a phantom power supply source.
the changes in electrical energy between these two plates will travel through the wires
of the microphone and eventually reach your digital mixer or A/D converter. essentially
the biggest difference between these microphone types is the way by which acoustical
energy is transformed into electrical energy: one assisted by an electrical source and
the other by a magnet. both are capable of facilitating a quality audio recording and are
recommended for use in the field of digital reporting
pick-up pattern - answeris the set path in which a microphone will intercept sound
cardioid pick-up pattern - answer(also known as unidirectional) meaning heart shaped,
is a heart shaped pattern which reaches out from the diaphragm of a microphone. This
pick-up pattern is beneficial for capturing a SINGLE voice located in front of a
microphone while rejecting additional ambient room sound
omnidirectional pick-up pattern - answeris the combination of the word omni meaning
"ALL" and direction. It intercepts sound from all directions from its placement. meaning it
captures sound equally from all directions. Its beneficial for capturing multiple voices
using only one microphone
low profile boundary microphone - answerthese microphones lay flat on a desk or table
and are commonly no more than inch or two thick. one important note about these
microphones is that you must be aware of its location so that it does not get covered up.
out of sight, out of mind should not be the approach for these microphones
lavalier microphone - answerthis is an extremely small condenser microphone that
attaches directly to the speaker. These microphones are extremely useful when the
environment does not offer an opportunity to place a microphone in front of a speaker.
they can be both wired and wireless. the use of these mics requires the use of batteries
and should be used with extreme caution
XLR connectors - answerare the most common microphone connectors. ______ cables,
commonly refered to as microphone cables have a male end and a female end. without
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