Exam (elaborations)
CS6250 Exam 2 - Lesson 11
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- CS6250 Exam 2 - Lesson 11
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- CS6250 Exam 2 - Lesson 11
CS6250 Exam 2 - Lesson 11
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CS6250 Exam 2 - Lesson 11high bit rate - -The first defining property for video is ______, generally
somewhere between 100 kbps to over 3Mbps, depending on the quality of
the video.
-video - -The first defining property for _____ is high bit rate, generally
somewhere between 100 kbps to over 3Mbps, depending on the quality.
-stored video - -Streaming ________ is interactive (the user can play, pause,
etc.) and should have continuous playout, which means that it should play
out the same way it was recorded without freezing up in the middle.
-CDN - -Generally, streaming stored video files are stored on a ______ rather
than just one data center.
-audio and video - -Streaming live ________ generally has many
simultaneous users, sometimes with different geographical locations. They
are also delay-sensitive, but not as much as conversational voice and video
applications.
-delay-sensitive - -Streaming live audio and video generally has many
simultaneous users, sometimes with different geographical locations. They
are also ________, but not as much as conversational voice and video
applications.
-Conversational - -_______ voice and video is highly delay-sensitive and are
loss-tolerant.
-delay-sensitive - -Conversational voice and video is highly _______ and are
loss-tolerant.
-Audio - -_______ is encoded by taking many (as in, thousands) of samples
per second, and then rounding each sample's value to a discrete number
within a particular range.
-rounding - -Audio is encoded by taking many (as in, thousands) of samples
per second, and then ______ each sample's value to a discrete number within
a particular range.
-Quantization - -Rounding to a discrete number.
-encoding - -The three major categories of ______ schemes are narrowband,
broadband, and multimode (which can operate on either)
, -narrowband, broadband, multimode - -The three major categories of
encoding schemes are ________, _______, and _______ (which can operate on
either)
-signaling protocol - -A _______ takes care of how calls are set up and torn
down.
-QoS - -The three _____ VoIP metrics are end-to-end delay, jitter, and packet
loss.
-jitter - -The three QoS VoIP metrics are end-to-end delay, ____, and packet
loss.
-end-to-end delay - -The time it takes to encode the audio is an example of
_______.
-400 - -An end-to-end delay greater than _____ms starts becoming
unacceptable, as people start accidentally talking over each other.
-delay jitter - -Between all the different buffer sizes and queueing delays
and network congestion levels that a packet might experience, different
voice packets can end up with different amounts of delay. This is known as
_____.
-jitter buffer - -Using a _______ mechanism helps to smooth out and hide the
variation in delay between different received packets, by buffering them and
playing them out for decoding at a steady rate.
-longer - -A ______ jitter buffer reduces the number of packets that are
discarded because they were received too late, but that adds to the end-to-
end delay.
-shorter - -A _______ jitter buffer will not add to the end-to-end delay as
much, but that can lead to more dropped packets, which reduces the speech
quality.
-lost - -With VoIP, a packet is _____ if it either never arrives OR if it arrives
after its scheduled playout.
-packet loss - -VoIP protocols have three major methods of dealing with
________: FEC (Forward Error Correction), interleaving, and error
concealment.
-Forward Error Concealment (FEC) - -______ works by transmitting redundant
data alongside the main transmission, which allows the receiver to replace
lost data with the redundant data.
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