TI公司的TVP5158,TVP5157和TVP5156是四路高质量NTSC/PAL视频译码器,能把所有流行的基带模拟视频格式数字化和译码成数字视频输出.译码器每路包括10位27MSPSADC,复合输入信号以2xITU-RBT.601时钟频率取样,行频锁定对准,抽取1x象素速率.CVBS译码采用5行适应梳状滤波器,用于亮度和色度数据通路,以降低交叉干扰.所有四路是独立工作的,主要用于安全/监视数字视频录音/服务器和PCI产品,汽车娱乐设备视频集线器,游戏系统和大型视频墙显示器
TI公司的TVP5158, TVP5157和TVP5156是四路高质量NTSC/
PAL视频译码器,能把所有流行的基带模拟视频格式数字化和译码成数字视频输出.译码器每路包括
10位27MSPS
ADC,复合输入信号以2x ITU-R
BT.601时钟频率取样, 行频锁定对准,抽取1x象素速率. CVBS译码采用5行适应梳状
滤波器,用于亮度和色度数据通路,以降低交叉干扰.所有四路是独立工作的,主要用于安全/监视数字视频录音/服务器和
PCI产品,汽车娱乐设备视频集线器,游戏系统和大型视频墙显示器.本文介绍了TVP5158, TVP5157和TVP5156主要特性, 音频子系统功能方框图以及诸如
16路CIF记录和多路CIF预览等
多种TVP5158级联连接框图, 视频和音像输入连接图.
The TVP5158, TVP5157, and TVP5156 devices are 4-channel, high-quality NTSC/PAL video decoder that digitizes and decodes all popular b
ase-band analog video formats into digital video output. Each channel of this decoder includes 10-bit 27-MSPS A/D c
onverter (ADC). Preceding each ADC in the device, the corresponding analog channel contains an analog circuit that clamps the input to a reference voltage and applies the gain.
Composite input signal is sampled at 2× the ITU-R BT.601 clock frequency, line-locked alignment, and is then decimated to the 1× pixel rate. CVBS decoding uses five-line adaptive comb filtering for both the luma and chroma data paths to reduce both cross-luma and cross-chroma artifacts. A chroma trap filter is also available. On CVBS inputs, the user can control video characteristics such as contrast, brightness, saturation, and hue via an I
2C host port interface. Furthermore, luma peaking (sharpness) with programmable gain is included.
All 4 channels are independently controllable. These decoders share a single clock input for all channels and for all supported standards.
TVP5158 provides a glueless audio and video interface to TI DaVinci™ video processors. Video output ports support 8-bit ITU-R BT.656 and 16-bit 4:2:2 YUV with embedded synchronization. TVP5158 supports multiplexed pixel-interleaved and line-interleaved mode video outputs with metadata insertion. TVP5158 and TVP5157 integrate 4-Ch audio ADCs to reduce the BOM cost for surveillance market. Multiple TVP5158 devices can be cascade connected to support up to 8-Ch Video or 16-Ch audio processing.
Noise reduction and auto contrast functions improve the video quality under low light condition which is very critical for surveillance products.
The TVP5158, TVP5157, and TVP5156 can be programmed by using a single I
2C serial interface. I
2C commands can be sent to one or more de
