全部博文(668)
分类:
2009-08-25 15:59:28
CCIR
Comite Consultatif International des Radiocommunications. The agency responsible for the international use of the radio spectrum. Effective in 1993, the CCIR is now known as the International Telecommunications Union — Radio. ITU-R and ITU-T form the International Telecommunications Union.
CCIR
国际无线电通信咨询委员会。这家委员会负责管理国际无线电频谱。成立于1993年。CCIR 目前的名称是国际电信联盟——无线电部门。ITU-R 与 ITU-T一起共同组成国际电信联盟。
CCIR 601
An internationally agreed-upon standard for the digital encoding of component color television that was derived from the SMPTE RP125 and the EBU 324E standards. It uses the 4:2:2 sampling scheme for Y, U and V with luminance sampled at 13.5 MHz and chrominance (U and V components) sampled at 6.75 MHz. After sampling, 8-bit digitizing is used for each channel. These frequencies are used because they work for both 525/60 (NTSC) and 625/50 (SECAM and PAL) television systems. The system specifies that 720 pixels be displayed on each line of video. The D1 digital videotape format conforms to CCIR 601. See CCIR 656. The CCIR is now known as the ITU-R. See ITU-R.
CCIR 601
一种国际公认的组成色电视机数字译码标准,标准源于 SMPTE RP125 和 EBU 324E 标准。标准采用 4:2:2 采样方案代表 Y、U 和 V 分量,其中亮度的采样频率为 13.5 MHz,色度(U和 V 分量)采用频率为 6.75 MHz。采样后,每一个信道使用 8 比特数字化方案。之所以采用这些频率是因为 525/60 (NTSC) 和 625/50 (SECAM 和 PAL)电视系统都使用这些频率。该电视系统规定视频每一行需要显示 720 个像素。D1 数字录像带格式也遵从 CCIR 601 标准。参见 CCIR 656。CCIR 又称为 ITU-R。参见 ITU-R。
CCIR 656
The international standard defining the electrical and mechanical interfaces for digital TV operating under the CCIR 601 standard. It defines the serial and parallel interfaces in terms of connector pinouts as well as synchronization, blanking and multiplexing schemes used in these interfaces. The CCIR is now known as the ITU-R. See ITU-R.
CCIR 656
该国际标准定义了采用 CCIR 601 标准的数字电视机电子和机械接口。该标准定义了串行和平行接口中有关这些接口的连接器接脚分布以及同步、消隐以及复用方案方面的标准。CCIR 又称为 ITU-R。参见 ITU-R。