% c 1% AA % CF % ebk 860% B6 % D4 % B7 % BD % CC % FD % B2 % BB % B5 % BD % CE % D2 % B5 % C4 % C9 % F9 % D2 % F4 % A3 % BF

Preferably BD. . DVD is 480P video. . I.e. vertical 480 pixels. Hd 720P or 768P. . BD 1080P .。 So BD is the best.

What are HD, HDTV, BD (Blu-ray) and HDDVD?

What is HD HDTV, BD (Blu-ray) HDDVD?

/& gt； We know that DVD has given us unparalleled audio-visual enjoyment in the VCD era, but the progress of technology and the continuous follow-up of people's needs put forward higher requirements for video quality: the screen should be wide to higher image quality! Therefore, HD was born.

What is HD:

Simply put, the format of high-definition English expression with physical resolution above 720p is high-definition. The so-called Full HD refers to the top-level HD specification with physical resolution as high as 1920× 1080 progressive scanning and 1080P.

What is HDTV: br/>

The abbreviation of HDTV, translated into Chinese, is the average of suspended definition TV and high definition TV. DTV (digital TV), digital TV, high-definition TV and digital TV technology are all based on digital signals, and HDTV technology belongs to the highest standard of DTV and has the best video and audio effects. HDTV, digital signal transmission used by HDTV, and analog signal transmission of traditional TV system at present. From the collection and production of high-definition TV programs to the transmission of TV programs, and the reception of all-digital high-definition TV at the client, we have brought high-definition resolution as high as 1920× 1080, and the frame rate as high as 60fps, which is enough to make the current DVD ashamed. In addition, from the aspect ratio of the original 4:3 HDTV screen to 16:9, please visit the cinema. At the same time, due to the use of digital technology, the signal anti-noise ability is greatly enhanced. Audio system and HDTV support Dolby 5. 1 channel transmission, bringing Hi-Fi hearing enjoyment. Compared with analog TV, digital TV, high-definition picture, high-fidelity audio, TV signal storage, computer multimedia system, full use of frequency resources and many other advantages, it is bound to promote high-definition TV home theater.

HDTV is the highest standard of DTV and has the best video and audio effects. Digital TV is a digital TV technology and the successor of traditional analog TV technology. The so-called digital TV, from the studio to the transmission, all links in the transmission, the receiving process uses digital TV signals, or the signal propagation is completed through the binary digits of the digital stream.

In addition, DTV technology can also be divided into low definition television (low definition telephoto vision). The horizontal resolution of the image is more than 250 lines, the resolution is 340×255, and the amplitude is 4:3, instead of the resolution of the existing VCD. The horizontal resolution of the image is standard definition television (SDTV), 500-600 lines, with a minimum of 480 lines and 720× 570 lines. SDTV and HDTV are suitable for broadcasting post-production video standards. Analog TV and digital TV have the advantages of high-definition picture, high-fidelity stereo, TV signal storage, computer multimedia system and full use of frequency resources.

HDTV video should have at least 720 lines of non-interlaced scanning (720p, often performed) or interlaced scanning (1080i, which is often called interlaced scanning) 1080 lines of interlaced scanning (DVD standard is 480 lines), and the screen aspect ratio is 16:9. The audio output of +0 channel (dolby digital format) is 5.65438, while receiving digital processing and reproduction of other signals compatible with lower formats. Yousan

HDTV format: 720P( 1280×720 non-interlaced with field frequency of 24, 30 or 60), 1080( 192? 0× 1080 interlaced scanning field frequency is 60),1080p (1920×1080 non-interlaced scanning field frequency is 24 or 30), but it is basically only analog video that inherits the corresponding algorithm and the original TV video definition standard. There are only two clear standards for real HDTV: resolution coding algorithm. It is the most common sample circulating on the Internet, and the sample of 1080P is relatively high on Microsoft's WMV-HD website. 720P and 1080 i

There are two main formats of American HD standards, 1280×720p/60 and1920×1080i/60; Europe tends to 1920× 1080i/50, which is the highest in the 720p format. The required line frequency is 45KHZ, and the line frequency of 1080i/60Hz is 33.75khz. The line frequency of1080i/50hz is lower, only 28.8.

1080i/50Hz and 1080i/60Hz have broken the 1000 line, but they are scanned twice in interlaced scanning mode, and the actual number of scanning lines per field is 1080/2. Because a complete picture needs two scans to show slight flicker and crawling, which limits the principle of interlaced scanning technology, there are still fine pictures and still images. However, 720p/60Hz is different. It is a progressive scanning mode, which can complete a complete picture display at one time. Single scanning line can reach 720 lines, and horizontal scanning can reach 1280 points. The field frequency is 60Hz, and the picture is stable and clear without flicker.

We often see the resolution of 1280×720 and 1920× 1080, which is really a great challenge. Now it will be difficult to further improve the resolution of the display, even better image quality in the existing display, because the bottleneck at this time is the display device. To be sure, the resolution of the 32-inch screen, 1920× 1080, has basically reached the resolution limit of the human eye's dynamic video definition, that is, no matter how high the resolution is, it shows advantages on the big screen.

Besides the main aspects of the coding algorithm of HDTV resolution, it can't be ignored. HDTV can be basically divided into three algorithms: MPEG-2-TS, WMV-HD and H.264 There are differences in natural compression ratio and image quality among different coding technologies. Relatively speaking, the compression ratio of MPEG2-TS is poor, while WMV-HD and H.264 are more advanced. Moreover, the decoder of "compression ratio" difference coding technology is simple and easy to understand, which has low requirements for the environment and can also reduce the requirements for hardware equipment.

What is BD (blue light)

Blu-ray or Blu-ray Disc (BD) has a shorter wavelength (405 nm), and blue laser reads and writes data, hence the name. Traditional DVD requires red laser (wavelength 650nm) to read or write data. Generally, the shorter the laser, the more information can be recorded or read per unit area. Therefore, blue light greatly improves the storage capacity of optical discs and is used for optical storage products. Blu-ray provides a chance for a leap.

Up to now, Blu-ray is the most advanced large-capacity optical disc format. With the great progress of BD laser technology, you can store 25GB-50GB document files on a CD. This is several times more than the existing (single disc) DVD. Speed, Blu-ray recording speed allows 1-2 times or 4.5 to 9 megabytes per second.

Blu-ray disc has an exceptionally strong layer, the recording layer, which can protect the inside of the disc. Philips Blu-ray Disc is an advanced vacuum bonding technology, forming a security layer with a uniform thickness of100μ m. Philips Blu-ray Disc can withstand frequently used living fingerprints, scratches and dirt, and Blu-ray products ensure the security of storage quality data.

Technically, the Blu-ray recorder system can be compatible with various optical disc products that appeared before. The huge capacity of Blu-ray products brings high-definition movies, games and large-capacity data storage and convenience. Will greatly promote the development of high-definition entertainment.

In 2007, Sony introduced the configuration of China's first high-definition Blu-ray DVD player: bdp-s300/bm Blu-ray Player was commercialized in China, which paved the way for the dispute between PlayStation 3 Blu-ray and HD-DVD standards. However, the price of this DVD as high as 5,000 yuan has discouraged many consumers. There is still a long way to go for cost binding and popularization of blueray.

Performance standard of bdp-s300/bm Blu-ray player

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1080 signal output 24 frames per second movie (DPB)/>; XV Gamut Gamut Standard

BRAVIA cinema synchronization has cinema synchronization function.

What is HDDVD?

HD DVD (high definition DVD) is a kind of optical disc with digital optical storage format, which is formulated and developed by the HD DVD Promotion Association (HD DVD Promotion Group). Similar digital storage media of its competitors, such as HD DVD, Blu-ray Disc and CD, are all of the same size (diameter 120mm) and use blue light with a wavelength of 405nm.

Hddvds are promoted by Toshiba, NEC, Sanyo Electric and other promotion associations. Hewlett-Packard (which also supports BD), Microsoft and Intel have also joined the HD DVD camp, and Universal Pictures, the mainstream studio, is one of them.

In terms of HD DVD of sound, it supports 24-bit/192 kHz coding for up to two channels or 24-bit/96 kHz coding for up to eight channels. All HD DVD players must support linear PCM (uncompressed), Dolby Digital AC-3, Dolby Digital EX, DTS, dolby digital Plus and Dolby TrueHD decoding. If it is HD DVD soundtrack, the second soundtrack can use the above format, or use DTS-HD high-resolution audio and DTS-HD main audio.

In order to enjoy the highest definition audio, HD DVD manufacturers can choose to use linear PCM, Dolby TrueHD or DTS-HD main audio coding. However, due to the very high bandwidth requirement, lossless linear PCM audio input is usually used for lossless Dolby TrueHD format HD DVD.

Image HD DVD supports many different resolutions, from the highest to the lowest CIF SDTV DVD standard image storage, HDTV, 720P, 1080I, 1080P. Encoding, HD DVD, but DVD supports MPEG2 or more effective AVC and VC- 1.

However, in 2008, it was announced that the original Warner Company supported HD DVD, and some chain stores decided to support American Blu-ray products. Toshiba finally officially announced that it will terminate HD DVD on February 65438, 2009. This also means that the war between HDDVD and BD is a complete failure.

The first letter of the Greek alphabet.

The first letter of the Greek alphabet.