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AAERT CER Exam Questions and Answers

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  • AAERT CER

Methods of audio recording  :-- Analog and digital Microphone  :-- Converts acoustical energy that is sound into electrical signal that can be delivered to either an analog or digital device Path of digital audio  :-- To change the analog signal to a digital signal it will need to p...

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  • August 28, 2024
  • 18
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • AAERT CER
  • AAERT CER
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AAERT CER Exam Questions and Answers
Methods of audio recording


 :-- Analog and digital




Microphone


 :-- Converts acoustical energy that is sound into electrical signal that can be delivered to

either an analog or digital device




Path of digital audio


 :-- To change the analog signal to a digital signal it will need to pass through an analog to

digital

converter (digital mixer or A/D converter)




Sample rate


 :-- Number of samples taken each second when recording sound. (44.1 kHz, 48 kHz, et

cetera)




Bit rate


 :-- the number of bits transferred or received per unit of time (usually 16 or 24 bits)




Low sampling rate




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 :-- Approximation




High sampling rate


 :-- Smooth




Digital mixer or A/D converter


 :-- The digital mixer, or A/D converter, will output the signal through one of a variety

of connections such as USB, FireWire (IEEE 1394), serial, local computer bus, or

Ethernet.




Dynamic Microphone


 :-- (Moving coil) - made up of 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 the top of the magnet. The

movement of the coil over top of the magnet creates an electrical signal which travels

through the wires within the microphone and eventually reaches your digital mixer or

A/D converter.




Condenser Microphone




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 :-- Consists of a front plate (diaphragm), back plate, and a 48-volt power source. The

front and back plate together create a capacitor. When 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 phantom power.




Should you use microphones with batteries?


 :-- No. 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.




Digital mixers and A/D converters act as


 :-- Phantom power source for condenser microphones




Biggest difference between dynamic and condenser microphones


 :-- 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.




Pickup pattern


 :-- Set path in which a microphone will intercept sound




Cardioid pickup pattern




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