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Wed 6 Jul, 2005 04:37 pm
I'm applying for a job. It's mostly a writing job, with a research component. They've made it clear that I need to be able to find the answers to these questions, but that they expect I'll get the answers via research -- if I know it off the top of my head, that's great, but not required.
So, the research shortcut -- asking you guys!!
These are the questions:
1. What's the difference between the laser in a CD-ROM drive and the laser in a DVD player?
2. Which video standard would you use in Thailand?
NTSC
PAL
SECAM
3. What is the capacity of a DVD-R disc?
4. What is the most common interface for transferring digital video from a camcorder to a computer?
USB
Composite video
IEEE 1394 (FireWire)
S-Video
5. On a camcorder, why are 3 CCDs better than 1?
6. What is the difference between optical zoom and digital zoom? Which is better?
7. What is the purpose of white balance?
8. What is real-time non-linear editing?
9. What advantages does an LCD flat-panel TV have over a plasma flat-panel TV?
10. What advantages does a plasma flat-panel TV have over an LCD flat-panel TV?
11. Can I use a DV cassette in a DVCAM deck?
12. What is S-Video?
13. A 32-bit video file contains three 8-bit channels, one for each of the three primary colors. What is the remaining 8-bit channel used for?
14. How much full-screen, full-quality video will fit on a Video CD?
15. What is pixel response time, and how does it affect image quality?
16. Which of the following are digital video file formats?
.AVI __
.AIFF __
.MPG __
.WAV __
.MOV __
.DXF __
.JPEG __
.DOC __
.EXE __
17. How does high-definition TV achieve its high-definition image?
18. What is the aspect ratio of a TV image that is "letterboxed"?
19. In your opinion, what is the most impressive development in consumer video in the last 5 years, and why? 50 words or less, please.
Thanks!!
I'm gonna put answers here as I find them... feel free to correct.
#2: PAL
#6: Optical zoom is better. Digital zoom is basically just cropping. Optical zoom uses the lens to bring things closer.
#7: The purpose of white balance is to ensure that whatever the source of light, the colours of a subject photographed under that light will be reproduced as faithfully as possible. It basically means color balance.
Did you want help getting some of the answers?
#12: Separated Video, an encoded video signal which separates the luminance (brightness) and chrominance (colour) signals, it improves the picture quality when connecting televisions and video projectors to any high quality video source such as Digital Broadcast, Satellite, D-VHS and DVD's.
Yes, husker.
I'm researching the answers myself, will probably work my way through all of them before too long, but would like feedback and expert input from people who know a lot about this stuff. As in, not for anyone to look it up for me, but if someone happens to know the advantages and disadvantages of LCD vs. plasma flat-panels, would be great to get your take. Any answers I haven't posted yet would be appreciated, too.
I have to pause, but will be back.
#19
The consumer camcorder, has become such an integral part of people's lives."
expand on that
#4 -- just a guess -- firewire
#16: AVI and MOV for sure, not sure about mpg.
Thanks guys. Back into the fray:
#3: Changing. Typically 4.7 GB. An 8.5 GB dual layer version by Pioneer appeared this year.
#5. A CCD (charge coupled device) is an image sensor in digital cameras. In a camera with a single CCD, approximately 50% of the pixels are dedicated to capture Green, 25% to capture Red and 25% to capture Blue. This technology does not produce life like color fidelity.
If there are three CCDs, each one is assigned a primary color (red, green, and blue), which produces a significantly sharper image and realistic coloration.
#13 seems to be a trick question. The 8 extra bits are not used at all. It can just be processed more quickly than 24-bit. (?)
#17: Copy and paste from Wikipedia -- I haven't parsed it to my satisfaction yet:
#15: The time it takes for a pixel to switch from active to inactive. If the time is too slow, the result is motion trails.
#18: A typical TV has an aspect ratio of 4:3. or about 1.33 inches in width for every inch in height. Movies are shot using aspect ratios between 1.85:1 and 2.4:1. By adding a black area along the top and bottom of the screen, a regular TV is able to mimic the aspect ratio of the movie screen.
#16:
.AVI __
.MPG __
.MOV __
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