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Tv card TV card selection
1. Buy on demand
If you just want to watch TV on the computer screen, you don't need to collect it on the computer. You can buy a TV box and connect it directly to the computer monitor, which is very convenient.
If you want to record TV programs on the computer, you can buy a TV card. You can not only watch TV programs on the computer, but also make your favorite programs into VCD, which is your family's best companion.
If you want to display the contents of the computer directly on the TV, then you can choose a video conversion box, which is usually used in company demonstrations and shopping malls.
Of course, if you want to watch TV programs on your laptop, you have to buy a USB TV box.
2. Measurement of TV card performance.
When buying a TV card, how to distinguish its performance is undoubtedly the most important, which is mainly measured from both software and hardware.
(1) Software aspect
1) application software: each TV card will have its own application software support. The application of some products is very user-friendly, and users' needs will be considered more in the process of use, such as self-search, multi-window program preview, scheduled recording and so on. And the application software of some TV cards is not very detailed. Generally speaking, the application software of TV cards of big brands is good. When buying, you can get a general understanding of this situation by looking at the product manual.
2) Compression: TV cards generally have compression function, which can compress the collected files into mpeg 1, MPEG-2, streaming media and other formats, which is convenient for making vcd or dvd. The source file recorded by TV card is in avi format, which contains the most complete information, but it is very large. Avi format video information can be compressed into smaller formats, such as mpeg 1 and MPEG-2, for storage by application software. Better software programs can provide greater compression ratio, higher video and audio quality and faster processing speed. Of course, these are also related to the computer configuration you use.
2) Hardware aspect
1) chip
The chip of the TV card is just like the cpu of the computer, which is the heart of the whole TV card. Its quality determines the processing ability and performance of TV cards. Chip brands with good reputation include Tirident, Philips, Keshengxun and so on.
2) Tuner
The sealed metal box connected to the RF interface on the TV card is the tuner circuit, and the left and right sides of this metal shell are to prevent signal interference. We can find many TV cards using the same video coding chip in the market, but the effect of receiving TV is quite different. Some images are very clear, while others are very fuzzy, which is caused by Andhadhun's poor quality. The tuner with poor quality has poor anti-interference ability and poor signal reception quality, and the TV program picture presented is naturally fuzzy and unacceptable. Good brands of tuners are LG and Philips.
3) Interface
On the interface board of TV card, we can always see some video interfaces to connect different video devices. The main video interfaces are RF interface, composite video and S-Video interface. Radio frequency RF interface is the TV signal input port we usually see. Composite video is the so-called AV connector, which is an RCA (Lotus Connector) interface. It is commonly used and can be seen in many devices, such as TV and stereo. Its working principle is: first, there is a basic black-and-white video signal (which can be compatible with black-and-white display devices), and then after each horizontal synchronization pulse, a color pulse and a brightness signal are added. Because the color signal is composed of various data, it is called "composite video" interface. S-video is a video interface with higher signal quality. It does not use signal superposition method to transmit video signals, but separates RGB signals from brightness signals, which can effectively avoid some unnecessary signal quality losses. So in general, the picture quality of S-Video output is better than that of AV output. In addition to the above interfaces, some TV cards also have FM stereo antenna interface, audio input interface, audio output interface, remote control receiving interface and so on. Of course, the more interfaces and functions a TV card has, the more expensive it will be.
4) Accessories
Some friends seldom pay attention to random accessories when buying TV cards. In fact, it is also an important standard to measure TV cards, and satisfactory accessories can be handy in the use process. For example, whether the TV card has a remote control, whether the fm radio has a receiving antenna, whether there is an audio cable and so on. And if you don't, hehe, what will it feel like?
3. Skills of choosing TV cards
When buying a TV card, besides looking at the process of solder joints, ports and gold fingers like buying other boards, it is mainly to check its shielding part. Because TV signals enter the TV card in the form of RF signals, and RF signals belonging to high-frequency signals will cause interference waves to the work of other boards in the computer, most of the circuits for processing RF signals in the TV card are wrapped in a layer of iron. The technology and design level of this part can be used as a reference to measure the quality of TV cards.
In addition, the price of common home computer video khakis in the market is mostly between 300-800 yuan, and the mainstream products produced by regular manufacturers are generally between 300-800 yuan. For the average user, it is enough to choose a TV card around 300 ~ 500 yuan, and it is unnecessary to be expensive. After all, a 2 1 inch color TV is only 800 ~ 1000 yuan now. Secondly, pay attention to the resolution of TV card when playing dynamic video. The higher the resolution, the better. No matter how inferior the TV card is, it should not be lower than the resolution standard that ordinary TV can achieve. For some good computer cards, they should reach or approach the video resolution standard above 400×300, while the professional card graduates exceed this standard.
Four, TV card related terms
1. Acquisition: refers to the input of audio and video signals from TV sets and other equipment into computers and other equipment. Usually, the saved file format is AVI. The loss of image quality is small, but the file is particularly large.
2. Compression: refers to the input of audio and video signals from TV sets and other equipment into computers and other equipment. At the same time, compression preservation is called hard compression. Then it is saved by software compression, which is called soft compression. Image quality loss varies with compression format, input format, etc.
3. Editing: refers to inputting the audio and video signals of TV sets and other equipment into computers and other equipment, and adding subtitles or special processing to audio and video files stored in computers.
4.VGA port refers to the display interface 15 pin.
5.PCI interface refers to the interface used to insert cards on the computer motherboard, which is called "built-in".
6.USB interface plug and play flat small mouth. Only applicable to machines running at a speed higher than 2.
7. 1394 port is also called DV port and firewire port. Generally, only digital cameras have this interface, and very few TV cards also have this interface. For example, the interface signal is the best for products such as "Picturesque Triple Crown".
8. avi: a file format used on the Windows platform, with a small loss of image quality, but a particularly large file.
9.VCD: Also known as MPEG 1, it is a file format with good quality, which is used for playing on Windows platform and home VCD.
10.DVD: Also known as MPEG2-2, it has the best quality and is the file format used in Windows platform and home DVD player.
1 1.Mpeg4: A file format with average quality, which is used for playing on Windows platform and Internet. It is a kind of streaming media, similar to RM format.
12.AV port, also called composite port, audio-visual port or analog port, is used to transmit audio-visual signals. Generally, televisions, cameras and video recorders all have this interface, and compression cards and nonlinear cards all have this interface, but the signal of this interface is poor.
13。 S-terminal is also called Y/C interface or HDTV interface, which is commonly used in televisions, cameras, video recorders, compression cards and nonlinear cards, but the signal of this interface is better than that of AV port.