"Nextchip N5 RX规格书更新及联系方式 2020"

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2020.03.03 (REV 0.0) N5 Data sheet

www.nextchip.com

10/55

Chapter 2

UNIVERSAL RX(1M to 8M15P)

N5 is a 2-Channel Universal RX which delivers high quality images. It accepts separate 2-Channel Universal Inputs from Camera and the other

video signal sources.

It digitizes and decodes 2-Channel Universal 1M to 8M 15P video formats into digital component video which represents 8-bit ITU-R

BT.656/1120 4:2:2 format and Sync Separate BT.601 Format with 27/36/37.125MHz, 54/72/74.25MHz and 108/144/148.5/297MHz multiplexed.

54/72/74.25/108/144/148.5/297MHz multiplex function is available, because it is in the range of Clock PLL.

N5 includes 2-Channel analog processing circuit that comprises anti-aliasing filter, ADC, CLAMP and Equalizer filter. It shows the best image

quality by adaptive high performance comb filter and vertical peaking filter. It also supports programmable Saturation, Hue, Brightness, Contrast

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

2.1

FUNCTIONAL OVERVIEW

The Universal 1M to 8M 15P RX separates luminance and chrominance signals from Universal Inputs. Figure 2.1 show the block diagram of

the N5 video processing.

Analog

CLAMP

Equalizer

filter

I2C

Genlock

YCS

Luma

Processing

Chroma

Processing

Output

Formatter

Anti

Aliasing

Filter

ADC

Universal

Inputs

CLK

8Bit-BT.601 / BT.656 /

BT.1120 Data

Format

Auto

Detector

V_SYNC(BT.601)

H_SYNC(BT.601)

Figure 2.1 Universal RX Video Processing of N5

The First step to decode Universal RX 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.(AGC)

N5 decides the attenuated image signal level via cable by EQ pattern; compensates the attenuated image signals by equalizer compensation

filter. (EQ Pattern)

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.

In regard to various video formats, N5 has the auto detection module for these video formats which uses different H/V Sync length according to

each formats. (Video Standard Auto Detection)

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. To achieve best quality of image, Adaptive

Comb Filter is used.

The color demodulator in chroma processing block accepts modulated chrominance data from Adaptive Comb Filter which generate Cb/Cr color

difference data. During active video period, the chrominance data is demodulated using sin and cos subcarrier data.

2020.03.03 (REV 0.0) N5 Data sheet

www.nextchip.com

11/55

2.1

ANALOG FRONT END (CLAMP, ANTI-ALIASING FILTER, EQ FILTER)

N5 includes 2 Channel Analog Processing circuits that comprise anti-aliasing filter, EQ Filter, ADC and CLAMP. Because its design is dedicated

for video application, Analog Processing circuit does not require external reference circuit. External coupling capacitance only is needed for N5.

Anti-aliasing Filter is controlled by Register and include bypass mode that don’t have AFE filtering.

2.2

GENLOCK (ROBUST SYNC DETECTION, ROBUST NO-VIDEO DETECTION)

N5 provides a fully digital Genlocking circuitry. The digital Genlocking Circuitry use the locking method of the timing control signals such as

horizontal sync, vertical sync, and the color subcarrier.

N5 uses the proprietary Genlock mechanism for video application system.

It supports very Robust Sync Detection & Robust No-Video Detection, and it is also showed reliable operation in Non-standard signal and

Weak-signal.

2.3

YCS (Y/C SEPARATOR)

The YCS is used to separate Y and C signal from Universal HD standard video signal. Therefore, The output image is sharper and clearer

compared to other device. To achieve this, BSF(Band Split Filter) is used

N5 can also separate Y signal from C signal out of input CVBS using the Notch Filter. And according to internal criteria in the N5, the Notch and

Comb filters can be mixed for use. In special case, use the Notch filter to separate Y signal from C signal to have a good-quality image.

2.4

LUMA PROCESSING

The high-frequency range of Y/C separated data has a relatively smaller magnitude than the low-frequency range. The high-frequency range

makes the image more distinct and remarkable, but may induce worse coding efficiencies when video signal is compressed.

N5 provides the peaking filter and Gain control for emphasizing or depressing the high-frequency area to avoid this problem. The Peaking filter

is applied to this purpose and its characteristics can be controlled by register (Y_PEAK_MODE, 0x18[7:4] / 0x19[7:4], Bank0) via I2C interface.

2.5

CHROMA PROCESSING

The Chroma Processing mainly consists of 3 parts: demodulation, filtering, and ACC(Automatic Chroma-gain Control). The Chroma

Demodulator receives modulated chroma from YC separator, and generates demodulated color difference data. Demodulated data must be low-

pass filtered to reduce anti-aliasing artifacts.

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