Day 2 AP-GRAS Seminar
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Professional Development
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14 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose for the use of an ear simulator when testing headphones?
To realistically simulate the impact of the human head and torso in the sound field
To provide an acoustical loading similar to how a human ear will load the headphone
To provide an ear canal for realistic placement of a headphone
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of these can be considered as a limitation for the IEC 60318-1 ear simulator for headphone testing?
It can reliably be used only up to 8kHz
It has a short ear canal
You don´t have an ear canal so in-ear headphones and ear buds cannot be tested
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of these can be considered as a limtation for the IEC 60318-4 ("711 coupler") era simulator?
It has a big resonance at 13.5kHz and that can affect the reliability of the test results in the high freq range
It cannot be used to test in-ear headphones
The ear canal is too short
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which GRAS test fixtures can be equipped with a mouth simulator?
GRAS 45CB and 45CA
GRAS KEMAR and 45CA
GRAS 45CC and KEMAR
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What of the following things is important to remember when using a Mouth Simulator for headset test?
To make the signal coming out of the mouth simulator as loud as possible
To calibrate the Mouth Simulator´s frequency response
To measure the mouth simulator´s output at 1m distance from the mouth
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is important when performing ANC Insertion Loss Tests?
That the test fixture has enough self-insertion loss to provide reliable test results
That the self-noise of the ear simulator´s microphones are low enough
That the test is performed with a fixture using "711 couplers"
7.
MULTIPLE SELECT QUESTION
45 sec • 4 pts
Which of the below are Bluetooth Profiles commonly used in Headset Measurements
A2DP
AVRCP
HFP
HSP
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