Certified Videoconferencing Engineer
Exam Questions, Answers,
Thanks to www.exams.ws and www.examcheats.net.
But you don't need to have it from both of them, questions
from only one are sufficient regarding paper.
1---What is the speed of a European PRI?
A. 1.536 Mbps
B. 1.544 Mbps
C. 2.036 Mbps
D. 2.048 Mbps
2---When using robbed-bit signaling, how many kilobits
per second are passed on a single digital channel?
3---Which describes frequency response?
A. The ability to determine frequency content of a signal.
B. The ability of a device to respond to amplitude changes.
C. The ability of a circuit to define operating frequency
D. The ability of a device to operate within defined
4---Which describe the role room acoustics play regarding
acoustic echo cancellation? (Select 2 answers.)
A. People moving around in a room change the acoustic
paths presented to a microphone.
B. Fans, heaters, and air conditioners add background
noise to the room, changing the room acoustic paths.
C. Hard room surfaces act as reflectors for sound, causing
multiple acoustic paths from loudspeaker to microphone.
D. Heavy drapes and acoustic absorbers remove acoustic
paths and therefore cause problems for acoustic echo
5---Which describe training as it applies to Acoustic
Echo Cancellers (AEC)? (Select 2 answers.)
A. Training occurs regardless of the events occurring
in a given room.
B. Training is independent of room audio components
and gain settings.
C. Training is the process by which an AEC adapts to
the room acoustic system.
D. Training can be accomplished through an explicit
process such as white noise or pink noise.
6---Which correctly describes reverberation and echo?
(Select 2 answers.)
A. Echo is a coherent, distinct carry-on of sound.
B. Reverberation is irrelevant to conferencing audio.
C. Reverberation is long, distinct acoustic reflections.
D. Reverberation is an incoherent, diffuse carry-on
E. Echo is short, diffuse acoustic reflections that
linger after the original sound has stopped.
7---What does Automatic Gain Control (AGC) do? (Select
A. It turns up the volume to the far-end.
B. It selects among multiple microphones.
C. It turns down the volume to the far-end.
D. It builds the volume to the near-end microphone.
8---What correctly describes echo as it relates to acoustic
A. The sound one hears when the far-end is talking and
one tries to talk at the same time.
B. The sound of the room reverberation as picked up
by the local microphones, amplified and returned to
C. The result of sound bouncing off the walls in the
room caused by the person speaking in that room being
picked up by the microphones.
D. The sound of the far-end being returned to themselves,
caused by the room microphones picking up the audio
from the room loudspeakers.
9---What allows you to detect audio distortion? (Select
A. audible sound quality
B. measured audio signal level
C. measured background noise level
D. digital signal processor clock level
10---How is noise measured? (Select 2 answers.)
A. by volume
B. by distance
C. by amplitude
D. by impedance