Audio Integrating Systems

Question 1

Audio systems are controlled by _______.

Answer 1

Audio Integrating System

Question 2

Each flight station (Captain, First Officer, Second Officer, Observer, etc.) has an ______.

Answer 2

Audio Selector Panel (ASP)

Question 3

What is an Audio Selector Panel (ASP)?

Answer 3

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.

Question 4

Press to talk is located on the_______.

Answer 4

On the ASP, the Control Wheel, and often on the jack panel where microphones are connected.

Question 5

PTT may have two positions.

Answer 5

ON/OFF switch

Question 6

PTT may also have three positions.

Answer 6

OFF/INPH/MIC

Question 7

It is a “Flight Interphone”, MIC is connected to Transmit selection on ASP.

Answer 7

INPH

Question 8

Aircraft Headsets are typically rated at an impedance of ______.

Answer 8

600 ohms

Question 9

3 Microphones used for aircraft applications.

Answer 9

Hand Held Mic
Boom Mic
Oxygen (O2) Mask Mic

Question 10

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.

Answer 10

Carbon Microphones

Question 11

How does carbon microphones work?

Answer 11

• Sound waves striking the diaphragm cause movement of the carbon granules
• This results in current changes that are then amplified for transmission.

Question 12

Microphone that a wire wound coil is connected to the diaphragm

Answer 12

Dynamic Microphone

Question 13

How does Dynamic microphone work?

Answer 13

• 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.

Question 14

• smallest and lightest of all microphone elements.

- most effective NOISE CANCELLING mic and produces the clearest voice transmission

Answer 14

Electret Microphone

Question 15

How does Electret microphone work?

Answer 15

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

Question 16

these mics have carefully designed openings or ports which channel noise to both sides of the diaphragm at the same time.

Answer 16

noise cancelling mics

Question 17

How does Noise cancelling microphones work?

Answer 17

The pressure on both sides of the diaphragm is equal, so it is cancelled out. There is NO DIAPHRAGM movement.