what is ahd camera

AHD Camera, what is it?

Old traditional surveillance system’s upgrading and replacing can’t balance between achieving high definition surveillance and combining old traditional analog system become headache for users. In standard analog surveillance system, 960H may be the highest resolution, to accomplish higher resolution becomes impossible mission for traditional surveillance system since its limitation from its technology.

If adopts all high definition (HD) IP camera, the complete system have to replace, this can not merely generate high labor cost, but significantly increased the project budget also.

AHD means analog high definition, AHD’s birth, would be to solve the transmission distance limitations of existing HD-SDI solution. As you of new HD analog solution, AHD supports video transmission over traditional 75-3 coaxial cable around 500 meters, also it becomes another alternative for HD analog solution. By the real way, it inherits and carries forward benefits of traditional analog solution, video signal are uncompressed, keep all of the original video details, to seriously achieve high definition uncompressed lossless, no video effect latency.

1.3 megapixel AHD Camera Module

Much like other HD analog solutions, through utilizing the progressive scan CMOS image sensor, the AHD camera can deliver 1.0 megapixel, 1.3 megapixel, 2 megapixel resolution, added with ICR filter, the camera achieve true day/night video surveillance; and same just like the traditional analog system, AHD products support plug-and-play installation, simple to use.

Introduction to AHD Cameras

Recently, some ongoing companies offer AHD analog cameras which deliver 1.0 megapixel and 1.3 megapixel resolution. 1.0 megapixel AHD camera adopts OV9712 + NVP2431H, and 1.3 megapixel adopts Sony® IMX238 + NVP2430H chipsets.

1.3M CMOS sensor support

Programmable AE/AWB/AF detection

3D-NR(Noise Reduction) for NVP2430H

3D-NR(Noise Reduction) for AHD 1.0

Output for NVP2431H


Digital wide dynamic range (DWDR)

Low shutter

User defined OSD

Dead pixel compensation (live/static)

On chip MCU & SDRAM

1.3 megapixel AHD Camera

AHD chipsets are from Korean company – Nextchip, the business launches AHD chipsets (NVP2430H/NVP2431H) that may use 1.3 megapixel progressive scan CMOS image sensor. The brand new HD-AHD chipsets are made to meet up with the demands of new trend in CCTV market, it really is ideal for both analog HD camera and cost-effective HD-SDI applications. The primary idea of NVP2430H is supporting 1.3M CMOS sensor and output I/F as analog 1280H(CVBS/COMET), AHD 1.0(720p) and HD-SDI 720p. NVP2431H is supporting 1.3M CMOS sensor and output I/F as analog 1280H(CVBS/COMET) and AHD 1.0 (720p).

1.3 megapixel AHD Camera

Analog High Definition AHD Camera

Introduction to AHD DVR

Currently, we still haven’t seen the true products of AHD DVR. Since Nextchip may be the AHD solution provider, it offers AHD codec chipset – NVP6114 also. NVP6114 is made to encode and record the video from AHD cameras. AHD DVR predicated on NVP6114 can support 4 channel AHD and 9 channel audio codec. It could use 1.0 megapixel and 1.3 megapixel AHD cameras, deliver top quality images.

NVP6114 includes 4-Channel AHD1.0 9-Channel and RX Audio Codec. 4-Channel AHD1.0 RX delivers top quality images. It accepts separate 4 CVBS/COMET/AHD1.0 inputs from Camera and another video signal sources. It digitizes and decodes NTSC/PAL/COMET/AHD1.0 video signal into digital video signal which represents 8-bit BT.656/BT.656like 4:2:2 byte interleave format with 27/36/54/72/108/144MHz multiplexed. Especially, With the ability to use same transmission cable with conventional one for COMET(SD level) and AHD 1.0 (HD level), plus they supply the superior image quality by minimizing the interference when separating C and Y. 9-Channel Audio Codec is 8-Channel Voice/1-Channel Mic PCM Codec which handles voice band signals(300Hz~3400Hz) with 8bit/16bit linear PCM, 8bit G.711(u-law, a-law) PCM. Built-in audio controller can generate digital outputs for recording/mixing and accepts digital input for playback. 4-Channel Coaxial Communication Protocol communicates between controller(DVR) and camera on the video signal through coaxial cable. COMET is Composite Video of Enhanced Technology in SD video by NEXTCHIP. AHD is really a video transmission technology in HD video by NEXTCHIP.



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