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| 1 | |
In __________compression, the integrity of the data _____ preserved because compression and decompression algorithms are exact inverses of each other. |
| | A) | lossless; is |
| | B) | lossless; is not |
| | C) | lossy; is |
| | D) | lossy; is not |
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| 2 | |
Which of the following compression method is not lossless? |
| | A) | run-length coding |
| | B) | dictionary coding |
| | C) | arithmetic coding |
| | D) | predictive coding |
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| 3 | |
Lempel Ziv Welch (LZW) method is an example of ______________. |
| | A) | run-length coding |
| | B) | dictionary coding |
| | C) | arithmetic coding |
| | D) | predictive coding |
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| 4 | |
______________ assigns shorter codes to symbols that occur more frequently and longer codes to those that occur less frequently. |
| | A) | Run-length coding |
| | B) | Dictionary coding |
| | C) | Arithmetic coding |
| | D) | Huffman coding |
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| 5 | |
In arithmetic coding the entire message is mapped to a real number in the interval _________. |
| | A) | (0, 1) |
| | B) | [0, 1] |
| | C) | [0, 1) |
| | D) | (0, 1] |
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| 6 | |
Which of the following compression methods is considered as predictive coding? |
| | A) | DM |
| | B) | DPCM |
| | C) | LPC |
| | D) | All of the choices are correct |
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| 7 | |
In ________, instead of quantizing each sample separately, the differences are quantized. |
| | A) | predictive coding |
| | B) | perceptual coding |
| | C) | transfer coding |
| | D) | pulse code modulation |
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| 8 | |
The adaptive DM (ADM) is used to solve the problem of _________ in DM. |
| | A) | a slowly growing original function |
| | B) | a fast growing original function |
| | C) | overload distortion or granular noise |
| | D) | All of the choices are correct |
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| 9 | |
_______ can achieve a high level of compression and is normally used in military for compressing speech. The synthesized speech, though intelligible, lacks naturalness and quality to identify the speaker. |
| | A) | LCP |
| | B) | DPCM |
| | C) | ADM |
| | D) | ADPCM |
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| 10 | |
__________ coding is based on the science of psychoacoustics, which is the study of how people perceive sound. |
| | A) | Predictive |
| | B) | Perceptual |
| | C) | Transfer |
| | D) | None of the choices are correct |
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| 11 | |
Which step of transform coding used in multimedia is lossy? |
| | A) | transformation step |
| | B) | quantization step |
| | C) | reverse transformation step |
| | D) | All of the choices are correct. |
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| 12 | |
Since the square matrix that represents the DCT coefficient is ____________ matrix, inverse and transpose are the same. |
| | A) | a linear |
| | B) | a square |
| | C) | an orthogonal |
| | D) | a symmetric |
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| 13 | |
____________ is used to compress images. |
| | A) | MPEG |
| | B) | JPEG |
| | C) | MPEG or JPEG |
| | D) | None of the choices are correct |
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| 14 | |
The first phase of JPEG compression process is ___________. |
| | A) | DCT transformation |
| | B) | quantization |
| | C) | lossless compression encoding |
| | D) | None of the choices are correct |
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| 15 | |
The second phase of JPEG compression process is ___________. |
| | A) | DCT transformation |
| | B) | quantization |
| | C) | lossless compression encoding |
| | D) | None of the choices are correct |
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| 16 | |
The third phase of JPEG is ___________. |
| | A) | DCT transformation |
| | B) | quantization |
| | C) | lossless compression encoding |
| | D) | None of the choices are correct |
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| 17 | |
____________ is used to compress video. |
| | A) | MPEG |
| | B) | JPEG |
| | C) | MPEG or JPEG |
| | D) | None of the choices are correct |
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| 18 | |
In MPEG method, the ________ compression of each frame is done with JPEG; redundant frames are removed during _______ compression. |
| | A) | temporal; spatial |
| | B) | spatial; temporal |
| | C) | lossy; lossless |
| | D) | None of the choices are correct |
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| 19 | |
________ audio/video refers to on-demand requests for compressed audio/video files. |
| | A) | Streaming live |
| | B) | Streaming stored |
| | C) | Interactive |
| | D) | None of the choices are correct |
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| 20 | |
___________ audio/video refers to the broadcasting of radio and TV programs through the Internet. |
| | A) | Streaming live |
| | B) | Streaming stored |
| | C) | Interactive |
| | D) | None of the choices are correct |
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| 21 | |
_________ audio/video refers to the use of the Internet for interactive audio/video applications. |
| | A) | Streaming live |
| | B) | Streaming stored |
| | C) | Interactive |
| | D) | None of the choices are correct |
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| 22 | |
A ________buffer is required for real-time traffic. |
| | A) | playback |
| | B) | reordering |
| | C) | sorting |
| | D) | None of the choices are correct |
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| 23 | |
To establish time relationship and order of the packets, a real-time traffic needs __________ on each packet. |
| | A) | only a timestamp |
| | B) | only a sequence number |
| | C) | both a timestamp and a sequence number |
| | D) | None of the choices are correct |
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| 24 | |
__________ means changing the encoding of a payload to a lower quality to match the bandwidth of the receiving network. |
| | A) | Translation |
| | B) | Mixing |
| | C) | Encoding |
| | D) | None of the choices are correct |
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| 25 | |
__________ means combining several streams of traffic into one stream. |
| | A) | Translation |
| | B) | Mixing |
| | C) | Encoding |
| | D) | None of the choices are correct |
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| 26 | |
To make up for the lost and corrupt packets, the real-time traffic normally ____________. |
| | A) | retransmits the lost and corrupt packets |
| | B) | uses forward error correction (FEC) method |
| | C) | retransmits the whole traffic |
| | D) | None of the choices are correct |
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| 27 | |
A real-time video performance lasts 10 minutes. If there is jitter in the system, the viewer spends _______ minutes watching the performance. |
| | A) | less than 10 |
| | B) | more than 10 |
| | C) | exactly 10 |
| | D) | None of the choices are correct |
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| 28 | |
A _______ shows the time a packet was produced relative to the first or previous packet. |
| | A) | timestamp |
| | B) | playback buffer |
| | C) | sequence number |
| | D) | None of the choices are correct |
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| 29 | |
_______ are used to number the packets of a real-time transmission. |
| | A) | Timestamps |
| | B) | Playback buffers |
| | C) | Sequence numbers |
| | D) | None of the choices are correct |
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| 30 | |
A _______ adds signals from different sources to create a single composite signal. |
| | A) | timestamp |
| | B) | sequence number |
| | C) | mixer |
| | D) | None of the choices are correct |
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| 31 | |
A _______ changes the format of a high-bandwidth video signal to a lower quality narrow-bandwidth signal. |
| | A) | timestamp |
| | B) | sequence number |
| | C) | translator |
| | D) | None of the choices are correct |
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| 32 | |
_____is an application layer protocol that establishes, manages, and terminates a multimedia session. |
| | A) | SIP |
| | B) | H.323 |
| | C) | RTP |
| | D) | None of the choices are correct |
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| 33 | |
_____ is a standard designed by ITU to allow telephones on the public telephone network to talk to computers connected to the Internet. |
| | A) | SIP |
| | B) | H.323 |
| | C) | RTP |
| | D) | None of the choices are correct |
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| 34 | |
_____ is not suitable for interactive multimedia traffic because we cannot allow retransmission of packets. |
| | A) | TCP |
| | B) | UDP |
| | C) | RTP |
| | D) | None of the choices are correct |
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| 35 | |
__________ is the protocol designed to handle real-time traffic on the Internet. |
| | A) | TCP |
| | B) | UDP |
| | C) | RTP |
| | D) | None of the choices are correct |
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| 36 | |
___________ is a protocol for controlling the flow and quality of data in association with RTP. |
| | A) | SIP |
| | B) | RTCP |
| | C) | H.232 |
| | D) | None of the choices are correct |
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| 37 | |
An RTP packet is encapsulated in _______. |
| | A) | a UDP user datagram |
| | B) | a TCP segment |
| | C) | an IP datagram |
| | D) | None of the choices are correct |
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