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PDF NVP1914 Data sheet ( Hoja de datos )
| Número de pieza | NVP1914 | |
| Descripción | 4-CH 960H Video Decoders and Audio Codecs | |
| Fabricantes | Nextchip | |
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NVP1914
4-CH 960H Video Decoders and Audio Codecs with Video
Encoder
Information contained here is subject to change without notice.
Make sure to check and use an updated version of the Data sheet.
www.nextchip.com
2012.11. 27
REV 0.0
1 page  
NVP1914
4-CH 960H Video Decoders and Audio Codecs with Video Encoder
Functional Block Diagram
Data sheet
11.27.2012 (REV 0.0)
3/108
5 Page 
NVP1914
2. Video Decoder
4-CH 960H Video Decoders and Audio Codecs with Video Encoder
NVP1914 is 4 Channel Video Decoder and delivers high quality images. It accepts separates 4
CVBS inputs from Camera, TV, or DVD and so on. It digitizes and decodes NTSC/PAL video
formats into digital components video which represents 8-bit BT.1302 4:2:2 format with 36MHz,
72MHz and 144MHz multiplexed. NVP1914 includes Clock PLL, so 72/144MHz time multiplexed
function available.
NVP1914 includes 4 channel analog processing circuit that comprise anti-aliasing filter, ADC, AGC
and CLAMP. It shows the best picture quality adopted by high performance 2D 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, PAL compensation and IF
compensation filter.
2.1. Functional Overview
The role of video decoder is to separate luminance and chrominance signals from composite
video signal. Figure 2.1 show the block diagram of the NVP1914
Figure 2.1. Video Decoder DATA FLOW of NVP1914
The First step to decode composite video signals is to digitize the entire composite video signal
using an A/D converter (ADC). NVP1914 uses the 10-bit 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 to about 9MHz 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 Adaptive Comb Filter.
The quality of decoded image is strongly dependent on the signal quality of separated Y and C.
To achieve best quality of image, 2D Adaptive Comb Filter is used.
Data sheet
11.27.2012 (REV 0.0)
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