What Is Data Rate?

Data rate refers to the amount of information (bits) transmitted on the channel per unit time. The larger the data rate, the greater the amount of information transmitted per unit time. The size of the data rate will affect the speed of information transmission and thus the quality of the business.

Chinese name: Data rate
Foreign name: Data rate

influences: Video clip quality
Explanation: The amount of information transmitted on the channel per unit time
Features: Number of viewers who can download files under restrictions

Data rate

The data rate affects the quality of the video clip, and it also affects the number of viewers who can download files for a given bandwidth limit.

When you use the Internet to transfer video, you should use a lower data rate to generate the file. High-speed Internet users

The file can be viewed almost without waiting, but dial-up users must wait for the file to download. If you expect your audience to be dial-up users,

You should make shorter video clips to keep download times within acceptable limits.

Flash Video Encoder allows you to specify the data rate required to encode low, medium, and high quality videos

Settings. If the settings provided in the Quality pop-up menu do not produce the results you need for your particular source video, select "Custom

"And enter a higher data rate in the" Max data rate "text box

Data rate about data rate

With some video codecs, you can specify the data rate to control the amount of video information processed per second during playback ^[1] . By specifying the data rate in Adobe Premiere Elements, you can set the maximum data rate because the actual data rate varies depending on the visual content of each frame.

The specified data rate depends on the purpose of the video. The following list illustrates data rate guidelines for some uses:

The DVD authoring data rate should maximize the quality while fitting the entire program in the available space on the DVD. By default, Adobe Premiere Elements will automatically adjust the DVD data rate.

The non-DV tape production data rate should be within the data transfer rate of the hard disk, as the video will be played back from the hard disk to the recording device. For information on hard drive data transfer rates, check out the documentation.

Hard disk playback determines the typical data transfer rate of the viewer's hard disk and sets the data rate accordingly. In general, the data rate of a 7200 rpm hard disk can be maintained at 20 to 35 MB per second, which is very high. In comparison, the average data rate of digital video is 3.6 MB per second. Therefore, for high-quality playback, you may not need to set the data rate to as high as 20 to 35 MB per second. However, if you are exporting videos for use in other editing systems or composite applications, such as Adobe After Effects, export in the highest quality. Use a lossless codec (that is, a codec that does not discard information when compressed) and specify the data rate that the editing system supports video capture and editing.

The CD-ROM playback data rate depends on the speed of the CD drive. For example, if you are preparing the final video file for a dual-speed CD-ROM drive (300 kilobytes / second), you can specify speeds of 150 kilobytes and 200 kilobytes per second to meet the data rate and movement of the drive System overhead required for the data.

The intranet playback data rate can be 100 kilobytes / second or faster, depending on the speed of the intranet. An intranet is an internal or private network that uses the Internet network protocol. Due to their limited range, Intranets typically use higher quality communication lines than standard telephone lines, so they are usually faster than the Internet.

Although streaming video on the web has fewer users using a dial-up connection than in previous years, you should still consider customizing the data rate for users who are still using this method to access the Internet (if you want your file to be accessible to more users View). Streaming video on the web is constrained by the limited bandwidth (56 KB or less) of modems for most consumers. If you know your audience has broadband Internet access equipment, such as DSL or cable modem services, use a higher bit rate.

Playback from a handheld device Because of the relatively small size, capacity, and low speed of handheld devices, data rates are important. Data rates can range from 8 to 90 kilobits per second, depending on the device. You can select preset QuickTime export options in Adobe Premiere Elements to export files optimized for playback on handheld devices.

Downloading a video file over the web Because the main issue is the time it takes to download the file, the data rate is less important than the size of the video file. However, there is still a need to reduce the data rate of downloaded videos, as doing so reduces the size of the video files and allows faster downloads.

Data rate Double data rate

The double data rate (GDR, also: doublepumped ) is selected due to a procedure of computer engineering, with that data can be transferred on a data bus with double data rate.

Similar procedures are four times the data rate (QDR) and four times and the eight data rate (ODR) at eight times the data rate.

Content 1 Technology and GDR2 Application 3 Designation 4 Advancement: DDR2 and DDR35Nebenentwicklungen: GDDR2 and GDDR36 Used Developments: QDR and QDR II

GDR Data rate technology and GDR

The data bits become shifted with the ascending and slanting side clock pulses only, not with the ascending and with conventional single data rate procedures. Therefore, the frequency of access in the storage unit does not have to be doubled, and it becomes a technique of 'fetching first'-returning in a specified way: The access is obtained from the equal data of the memory field very twice. . While the other half of the buffer only costs then with the falling side, the data half then costs with the rising clock side. As a result of the acceleration, the number must be consistently larger than the double bus width total request data (= 'brush length') as well. Since then it has not always been the case, and GDR SDRAM is more classical (SOUTHERN GERMAN BROADCASTING CORPORATION) SDRAM uses the same clock inaccurately twice as fast. A further reason is that the address and control signals are given in opposition to only the data signal and the clock side.

Data rate applications

During the bundle, the processor (front bus), main memory (GDR SDRAM), mass storage (Ultra-160 / Ultra-3 SCSI), and map map (AGP) use.

Data rate specification

Indications that the clock frequency is connected at double data rate The clock frequency of the bus is frequently confused at the data rate, ie. Become a processor bus with a 100 MHz clock frequency and dual data rate as 200 MHz Bus designation. This was facilitated by those who became marketing designators FSB200.

The starting point for the personal computer is also specified and the bus rate is given three numbers behind the megahertz (eg. PC-133 or PC133 = 133 megahertz). However the four numbers select the data transfer rate in MByte / s, and then point PC-2700 in the GDR SDRAM memory module for 166 MHz. Calculation: 166 MHz * 2 (where GDR) * 64 bits (bus width) = 21248 MBit / s / 8 bits = 2656 MByte / s, which is surrounded by 2700 MByte / s. Those PCs are therefore only-data is not limited and meaningful to GDR technology related to the indications of bus and technology designation (and then buses are clearly fixed width and factors).

DDR2DDR3 Data rate advancement: DDR2 and DDR3

The advancement of this concept of DDR2 and DDR3 is special for PC main memory, with those instead of double-first fetch, with quadruple and / or. Eight times first fetching works near a higher timing input / output, buffering is made possible. With DDR2 the actual memory cell therefore only becomes buffered at half the clock of the input / output. The marketing technology here is often mentioned on the one hand, four times first fetch development so that in the GDR approach (× 2) on the other hand and in this clock slice (× 2)-a total of four times first fetch. With DDR3 this is obviously going by adding that between the clocks of the input / output buffers and a difference in the clocks of the actual memory cells at a height of four times one will exist along with the GDR procedure-eight times fetch first. Although the part of the memory cell that provides the memory chip is clearly large with 90%, the clock of the input / output is applied with the DDR2 / DDR3-Speichern's pulse specification buffer as the official "".

DDR2 has become a DDR2-SDRAM with many motherboards and systems used by trendy motherboards in memory chips, and DDR3 came in the middle of 2007 in the market. The GDDR3-Speicher technology is often developed on DDR2 and not on DDR3 because it suggests names on the map.

Nebenentwicklungen GDDR2GDDR3 Data rate Nebenentwicklungen: GDDR2 and GDDR3

GDDR2 and GDDR3 are memory places exclusive on chart maps to be blocked. The opposite of the name is based on GDR SDRAM and GDDR3 suggested GDDR2 on DDR2-SDRAM. This is connected with the fact that GDDR2 and GDDR3 official specifications are not, but in some sense the big names of the big picture chip developers are represented.

QDRQDR II Data rate used development: QDR and QDR II

Quad data rate -RAM indicates one component, that benefits GDR SDRAM and dual haven RAM unites. It owns a haven of reading and writing separately, so collision-free can read and write independently. However, a common address line divides the data. Thus QDR SRAM may be transferred to a safe haven at the same time with rising and falling side data, resulting in quadruple data rates below the line. There are two types of QDR SRAMs, on one hand 2 words burst Variante and 4 words burst Variante. That is, reading or writing 2 becomes like and / or. 4 words read and / or. write. QDR is. Find. With System Bus Pentium 4 use, ODR with AGP-Bus (AGP-8X) and XDR Micro.

QDR II -RAM is an improved variant of QDR RAM with a reducted clock exit, an echo clock, so mentioned, for synchronous use. Thus the legal data window widens itself up to 35% at the same frequency. However, the underlying factors have long compared to QDR SRAMs around one and a half clocks, which can total higher clock frequencies and drive data rates.