参数资料
型号: TVP5020
厂商: TEXAS INSTRUMENTS INC
元件分类: 颜色信号转换
英文描述: COLOR SIGNAL DECODER, PQFP80
封装: POWER, PLASTIC, TQFP-80
文件页数: 8/89页
文件大小: 376K
代理商: TVP5020
2–2
Clamp
Clamp and AGC
Control Logic
Sync Processor
Clamp
Amplifier
Input Multiplexer
A/D
VI_1A
VI_1B
VI_2A
VI_2B
Analog Input Video
Digitized Video
Channel 1 (0–7)
Digitized Video
Channel 2 (0–7)
Figure 2–1. Analog Video Processors and A/D Converters
2.1.3
A/D Converters
The TVP5020 contains two 8-bit A/D converters which digitize the analog video signal inputs. To prevent
high frequencies which are above half of the sampling rate from entering into the system, video inputs may
require external anti-aliasing low pass filters.
2.2
Digital Processing
Figure 2–2 is a block diagram of the TVP5020 digital video processing. This block receives digitized
composite or S-video signals from the A/D converters, and performs Y/C separation, chroma demodulation,
and Y-signal enhancements. It also generates the horizontal and vertical syncs. The YUV digital output may
be programmed into various formats: 16-bit or 8-bit 4:2:2, 12-bit 4:1:1 and ITU-R BT.656 parallel interface
standard. The circuit uses comb filters to reduce the cross-chroma and cross-luma noise.
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