Audio Integrating Systems Flashcards
Audio systems are controlled by _______.
Audio Integrating System
Each flight station (Captain, First Officer, Second Officer, Observer, etc.) has an ______.
Audio Selector Panel (ASP)
What is an Audio Selector Panel (ASP)?
It allows crew member to listen to as many systems as desired, simultaneously and allows crew member to transmit on only ONE system at a time.
Press to talk is located on the_______.
On the ASP, the Control Wheel, and often on the jack panel where microphones are connected.
PTT may have two positions.
ON/OFF switch
PTT may also have three positions.
OFF/INPH/MIC
It is a “Flight Interphone”, MIC is connected to Transmit selection on ASP.
INPH
Aircraft Headsets are typically rated at an impedance of ______.
600 ohms
3 Microphones used for aircraft applications.
Hand Held Mic
Boom Mic
Oxygen (O2) Mask Mic
the oldest, simplest and usually the least expensive mic
A diaphragm is connected to a small container of carbon granules.
The transmitter supplies a small bias current across the mic terminals
- A diaphragm is connected to a small container of carbon granules.
Carbon Microphones
How does carbon microphones work?
- Sound waves striking the diaphragm cause movement of the carbon granules
- This results in current changes that are then amplified for transmission.
Microphone that a wire wound coil is connected to the diaphragm
Dynamic Microphone
How does Dynamic microphone work?
- sound waves move the DIAPHRAGM and COIL in a strong magnetic field
- As a result, an ELECTRICAL SIGNAL is generated
- The voltage of this signal varies with the amplitude and frequency of the sound waves.
- smallest and lightest of all microphone elements.
- most effective NOISE CANCELLING mic and produces the clearest voice transmission
Electret Microphone
How does Electret microphone work?
Diaphragm movement, caused by sound waves, translates into an electric signal due to changes in distance between a FIXED PLATE and a CHARGED PLATE diaphragm
