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CX23880 데이터시트(PDF) 5 Page - Synaptics Incorporated. |
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CX23880 데이터시트(HTML) 5 Page - Synaptics Incorporated. |
5 / 8 page ITU-R 656 4:2:2 Data Output The CX23880/CX23881 provides a 27 MHz, 8- or 10-bit ITU-R 656 decoded video output interface to allow connection of a third-party MPEG-2 encoder or other type of video codec. This is useful when the host CPU is not powerful enough to perform such tasks in software, or when high-quality encoding must be achieved. Please contact Conexant Application Engineering for a list of supported third-party video compressors. TV/FM application example Features: • Single-chip capture/record of broadcast TV and radio to PC • Global video standards support • Global audio standards support including FM/AM radio • Many I/O ports to differentiate design ITU-R 656/VIP 2.0 Pixel Data Input The CX23880/CX23881 provides a 27 MHz, 8-bit ITU-R 656 decoded video input interface to allow a third-party MPEG-2 decoder or codec to send 4:2:2 data over the PCI bus to a target video display frame buffer for video overlay. Alternatively, 480-line progressive scan video from the CX23490 all-format MPEG-2 decoder may be input to this port using Video Interface Port (VIP) 2.0-compliant pixel timing at up to 54 MHz. Antenna Cable Stereo Audio Out Tuner Ant1 Ant2 PCI BUS C Y L R C Y Serial Bus Composite or S-Video In What is a Broadcast Decoder? A broadcast decoder is designed to capture and decode the video and audio portions of any analog TV broadcast signal. In addition, a broadcast decoder must be able to address the transition to all-digital broadcasting by offering a variety of methods to connect to digital TV channel demodulators. Sufficient I/O must be provided to support external hardware-based compression of analog video/audio signals in order to enable storage onto hard disks or CDROM. Conexant’s broadcast decoder meets these objectives in the following way: 1) It captures and decodes all variations of NTSC, PAL and SECAM video standards into digital RGB or YUV pixel streams. 2) It captures and decodes all broadcast audio standards used worldwide such as BTSC/DBX, NICAM, A2, EIAJ and FM/AM, into 48 KHz PCM streams or stereo left and right audio signals. 3) It facilitates “analog to MPEG” conversion by providing an 8- or 10-bit ITU-R 656 pixel interface to an external MPEG 2 encoder for real-time compression. Providing a streaming host port or MPEG port for DMA of compressed data to the host or hard disk. 4) It provides a dedicated high-speed streaming MPEG port that is compatible with ATSC, DVB and ISDB digital television channel demodulators for DMA to the host or hard disk. TV/FM block diagram |
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