Topic Outline
- DIGITIZING AUDIO AND VIDEO
- AUDIO AND VIDEO COMPRESSION
- STREAMING STORED AUDIO/VIDEO
- First Approach: Using a Web Server
- Second Approach: Using a Web Server with Metafile
- Third Approach: Using a Media Server
- Fourth Approach: Using a Media Server and RTSP
- STREAMING LIVE AUDIO/VIDEO
- REAL-TIME INTERACTIVE AUDIO/VIDEO
- RTP
- RTCP
- VOICE OVER IP
- SIP
- H.323
Begin and Good luck!
1. _______ is a standard to allow telephones on the public telephone network to talk to computers connected to the Internet.
- A) SIP
- B) H.323
- C) Q.991
- D) none of the above
2. When there is more than one source, the _______ identifier defines the mixer.
- A) synchronization source
- B) contributor
- C) timestamp
- D) none of the above
3. __________ is the protocol designed to handle real-time traffic on the Internet.
- A) TCP
- B) UDP
- C) RTP
- D) none of the above
4. Jitter is introduced in real-time data by the _______________.
- A) error caused during transmission
- B) delay between packets
- C) both a and b
- D) none of the above
5. In a real-time video conference, data from the server is _______ to the client sites.
- A) unicast
- B) multicast
- C) broadcast
- D) none of the above
6. An RTP packet is encapsulated in _______.
- A) a UDP user datagram
- B) a TCP segment
- C) an IP datagram
- D) none of the above
7. 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 above
8. ____________ is used to compress video.
- A) MPEG
- B) JPEG
- C) either a or b
- D) none of the above
9. Real-time traffic needs the support of ____________.
- A) broadcasting
- B) multicasting
- C) both a and b
- D) none of the above
10. _______ are used to number the packets of a real-time transmission.
- A) Timestamps
- B) Playback buffers
- C) Sequence numbers
- D) none of the above
11. The third phase of JPEG is ___________.
- A) DCT transformation
- B) quantization
- C) data compression
- D) none of the above
12. The second phase of JPEG is ___________.
- A) DCT transformation
- B) quantization
- C) data compression
- D) none of the above
13. A __________on each packet is required for real-time traffic.
- A) timestamp
- B) sequence number
- C) both a and b
- D) none of the above
14. To prevent _________, we can timestamp the packets and separate the arrival time from the playback time.
- A) error
- B) jitter
- C) either a or b
- D) none of the above
15. __________ means combining several streams of traffic into one stream.
- A) Translation
- B) Mixing
- C) both a and b
- D) none of the above
16. A real-time video performance lasts 10 min. 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 above
17. ___________ audio/video refers to the broadcasting of radio and TV programs through the Internet.
- A) Interactive
- B) Streaming live
- C) Streaming stored
- D) none of the above
18. __________ means changing the encoding of a payload to a lower quality to match the bandwidth of the receiving network.
- A) Translation
- B) Mixing
- C) both a and b
- D) none of the above
19. ____________ is used to compress images.
- A) MPEG
- B) JPEG
- C) either a or b
- D) none of the above
20. A ________buffer is required for real-time traffic.
- A) playback
- B) reordering
- C) sorting
- D) none of the above
21. In ________ encoding, the differences between the samples are encoded instead of encoding all the sampled values.
- A) predictive
- B) perceptual
- C) both a and b
- D) none of the above
22. __________ encoding is based on the science of psychoacoustics, which is the study of how people perceive sound.
- A) Predictive
- B) Perceptual
- C) both a and b
- D) none of the above
23. _________ audio/video refers to the use of the Internet for interactive audio/video applications.
- A) Interactive
- B) Streaming live
- C) Streaming stored
- D) none of the above
24. According to the Nyquist theorem, we need to sample an analog signal ________times the highest frequency.
- A) three
- B) two
- C) four
- D) none of the above
25. ___________ is an application protocol that establishes, manages, and terminates a multimedia session.
- A) RIP
- B) SIP
- C) DIP
- D) none of the above
26. _________ is not suitable for interactive multimedia traffic because it retransmits packets in case of errors.
- A) UDP
- B) TCP
- C) both a and b
- D) none of the above
27. RTCP uses an odd-numbered _______ port number that follows the port number selected for RTP.
- A) UDP
- B) TCP
- C) both a and b
- D) none of the above
28. We can divide audio and video services into _______ broad categories.
- A) three
- B) two
- C) four
- D) none of the above
29. RTP uses a temporary even-numbered _______ port.
- A) UDP
- B) TCP
- C) both a and b
- D) none of the above
30. ________ audio/video refers to on-demand requests for compressed audio/video files.
- A) Streaming live
- B) Streaming stored
- C) Interactive
- D) none of the above
31. ___________ is a protocol for controlling the flow and quality of data.
- A) RTP
- B) RTCP
- C) UDP
- D) none of the above
32. A _______ adds signals from different sources to create a single signal.
- A) timestamp
- B) sequence number
- C) mixer
- D) none of the above
33. 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 above
34. The first phase of JPEG is ___________.
- A) DCT transformation
- B) quantization
- C) data compression
- D) none of the above
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