TI TVP5158四路NTSC-PAL视频译码方案

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 base-band analog video formats into digital video output. Each channel of this decoder includes 10-bit 27-MSPS A/D converter (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 I²C 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 I²C serial interface. I²C commands can be sent to one or more decoder cores simultaneously, reducing the amount of I²C activity necessary to configure each core. This is especially useful for fast downloading modified firmware to the decoder cores.

TVP5158, TVP5157, and TVP5156 use 1.1-V, 1.8-V, and 3.3-V power supplies for the analog/digital core and I/O. These devices are available in a 128-pin TQFP package.

TVP515x主要特性:

Common Device Features (TVP5156, TVP5157, TVP5158)

Four separate video decoder channels having the following features for each channel

Accepts NTSC (J, M, 4.43) and PAL (B, D, G, H, I, M, N, Nc, 60) video data

Composite video inputs, Pseudo-differential video inputs to improved noise immunity

High-speed 10-bit ADC

Fully differential CMOS analog preprocessing channels with clamping

Integrated Anti-Aliasing filter

2D 5-line (5H) adaptive comb filter

Noise reduction and auto contrast

Robust automatic video standard detection (NTSC/PAL) and switching

Programmable hue, saturation, sharpness, brightness and contrast

Luma-peaking processing

Patented architecture for locking to weak, noisy, or unstable signals

Four independent scalers support horizontal and/or vertical 2:1 downscaling

Channel multiplexing capabilities with metadata insertion

Pixel-interleaved mode supports up to four-channel D1 multiplexed 8-bit output at 108 MHz

Supports concurrent NTSC and PAL inputs

Support crystal interface with on-chip oscillator and single clock input mode

Single 27-MHz clock input or crystal for all standards and all channels

Internal phase-locked loop (PLL) for line-locked clock (separate for each channel) and sampling

Standard programmable video output format

ITU-R BT.656, 8-bit 4:2:2 with embedded syncs

YUV 16-bit 4:2:2 with embedded syncs

Macrovision copy protection detection

3.3-V compatible I/O

128-pin TQFP package

Available in commercial (0°C to 70°C) temperature range

Additional TVP5158/TVP5157 Specific Features

Integrated four-channel audio ADC with audio sample rate of 8 kHz or 16 kHz

Support Master and Slave mode I²S Output

Support audio cascade connection

Additional TVP5158 Specific Features

Enhanced channel multiplexing capability – Line-interleaved mode

Four-channel D1 multiplexed output at 8 bit at 108 MHz

Video cascade connection for 8-Ch CIF, 8-Ch Half-D1, and 8-Ch CIF + 1-Ch D1 outputs

Also available in Industrial (–40℃ to 85℃) temperature range

Applications

Security/surveillance digital video recorders/servers and PCI products

Automotive infotainment video hub

Large format video wall displays

Game systems

图1.音频子系统功能方框图

图2.16路CIF记录和多路CIF预览的TVP5158级联连接框图

图3.16路CIF记录和多路Half-D1预览的TVP5158级联连接框图

图4.16路CIF记录和2路D1/多路CIF预览的TVP5158级联连接框图

图5.音频级联连接框图

图6.TVP5158 4路D1 应用电路图(单个BT.656接口)

图6.TVP5158 4路D1 应用电路图(16位YUV 4:2:2接口)

图7.TVP5158 8路CIF实时编码和多路D1预览应用电路图


图8.TVP5158视频输入连接图

图9.TVP5158音频输入连接图