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NVP6124

Data sheet

02.11.2015 (REV 0.2)

9/125

4-CH AHD2.0 RX and 9-CH Audio Codec

2. AHD2.0 RX

NVP6124 is 4 Channels AHD2.0 RX and delivers high quality images. It accepts separates 4

CVBS/COMET/AHD1.0/AHD2.0 inputs from Camera and the other video signal sources.

It digitizes and decodes NTSC/PAL/COMET/AHD1.0/AHD2.0 video formats into digital components

video which represents 8-bit ITU-R BT.656/1120(like) 4:2:2 format with 27/36/37.125MHz,

54/72/74.25MHz and 108/144/148.5MHz multiplexed. 54/72/74.25/108/144/148.5MHz multiplexed

function will be available, because It built in Clock PLL.

NVP6124 includes 4 Channels analog processing circuit that comprise anti-aliasing filter, ADC,

CLAMP, Equalizer filter. It shows the best picture quality adopted by high performance adaptive

comb filter and vertical peaking filter. It also supports programmable Saturation, Hue, Brightness

and Contrast and several function such as CTI, Programmable peaking filter, various compensation

filters.

2.1. Functional Overview

The AHD2.0 RX separates luminance and chrominance signals from CVBS/COMET/AHD1.0

/AHD2.0.

Figure 2.1 show the block diagram of the NVP6124 Video processing.

Analog

CLAMP

Equalizer

filter

I2C

Genlock

YCS

Luma

Processing

Chroma

Processing

Output

Formatter

Anti

Aliasing

Filter

ADC

CVBS/

COMET/

AHD1.0/

AHD2.0

CLK

BT.656 /

BT.1120(like)

Figure 2.1. AHD2.0 RX Video Processing of NVP6124

The First step to decode CVBS/COMET/AHD1.0/AHD2.0 is to digitize the entire video signal

using an A/D converter (ADC). Video inputs are usually AC-coupled and have a 75 Ohm AC and

DC input impedance. As a result, the video signal must be DC restored every scan line during

horizontal sync to position the sync tips at known voltage level using the AGC/CLAMP logic. The

video signal also is low-pass filtered in Anti aliasing Filter to remove any high-frequency

components that may result in aliasing.

Vertical sync and horizontal sync information are recovered in Genlock block. When composite

video signal is decoded, the luminance and chrominance are separated by YCS(Y/C Separator).

The quality of decoded image is strongly dependent on the signal quality of separated Y and C.

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