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PDF NVP1918C Data sheet ( Hoja de datos )
| Número de pieza | NVP1918C | |
| Descripción | 8-CH 960H Video Decoders and 9-CH Audio Codecs | |
| Fabricantes | Nextchip | |
| Logotipo |  |
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NVP1918C
8-CH 960H Video Decoders and 9-CH Audio Codecs
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
2014.01.06
REV 0.0
1 page  
NVP1918C
Functional Block Diagram
8-CH 960H Video Decoders and 9-CH Audio Codecs
Data sheet
01.06.2014 (REV 0.0)
3/110
5 Page 
NVP1918C
2. Video Decoder
8-CH 960H Video Decoders and 9-CH Audio Codecs
NVP1918C is 8 Channel Video Decoder and delivers high quality images. It accepts separates 8
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 CCIR656 4:2:2 format with 36MHz,
72MHz and 144MHz multiplexed. 72/144MHz multiplexed function will be available, because It built
in Clock PLL.
NVP1918C includes 8 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 NVP1918C
Figure 2.1. Video Decoder DATA FLOW of NVP1918C
The First step to decode composite video signals is to digitize the entire composite video signal
using an A/D converter (ADC). NVP1918C 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
01.06.2014 (REV 0.0)
9/110
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet NVP1918C.PDF ] | |
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