How Camcorders Work?
Some members of the older generation remember the large video cameras of more than 20 years ago. These were so large and heavy that the user often had to rest them on the shoulder to keep them steady. Some of the earlier models required massive battery power and an assistant to carry the battery around.
Today, things are quite a bit different. Smaller camcorders have been on the scene of sporting events, school activities, weddings etc. for several years. Many of these are small enough to fit in the palm of your hand, though some larger, more complex models are slightly larger. In addition, battery technology has allowed camcorder users to get the same battery service (or even longer time) with much smaller, rechargeable batteries.
These amazing, small units now produce crisp video with bright colors, often for $300 or $400. Again, many larger, more complex video cameras cost thousands more. To understand how camcorders work, we have to look at both analog and digital technology, at least a summary of those two ideas. An analog camcorder had many of the same components as newer, digital cameras – quality lens, controls for zooming in etc. But they also had motors and reels to wind and rewind film/tape, which digital cameras don’t need, of course.
The lens focused an image that was transferred to video tape as an electronic signal. The information was stored on this special tape in specific magnetic patterns. All camcorders have some sort of viewfinder, with the latest designs offering a color image of what is being recorded so that the user can see exactly what will be in the action being recorded. New liquid-crystal display (LCD) screens are used.
With a digital camcorder, the image is transferred as an analog signal that is converted to digital form, as data bytes that are stored and retrieved in the same way information is stored and retrieved on a computer disk. This is the well-known binary form of 0s and 1s. In some digital camcorders there is no “track” of patterns on special tape. Some still use tapes but record the data digitally.
The camcorder lens focuses light from the image onto an image sensor that is basically a semiconductor surface. Brighter parts of the image create a larger electrical charge while smaller amounts of light from various parts of the image create smaller electrical charges.
One of the key benefits of digital camcorders is the consistent quality of copies made from the original. With older, analog/magnetic tape methods, copy quality tended to diminish. This is a key element of digital quality, as the most sensitive semiconductor surfaces not only distinguish light levels as black and white, but also measure light levels produced by various colors. The combination of high-quality tape and digital data storage make it possible to reproduce vivid color and quality motion.
Some of the most popular camcorders use DVDs as the storage device, making recording and replay simple and efficient.
Category: Consumer Electronics, Technology