What is Ahd – Troubleinthepeace

Table of contents

Obsolescence of Traditional Analog Technology What is AHD Technology? What is HD-TVI Technology? What is HD-CVI Technology? What is HD-SDI Technology? Comparison of AHD, HD-TVI, HD Standards -CVI, HD-SDI Should choose AHD, HD-CVI or HD-TVI (considering the interests of users)?

Compared with the outdated traditional analog technology, the technological revolution of AHD, HD-TVI and HD-CVI is a breakthrough technological step in the past 10 years. These 03 advanced technologies have helped to reduce the cost of camera production technology, and at the same time, the quality of cameras and recorders has been significantly upgraded. So What is AHD technology? and what is the difference between HD-TVI, HD-CVI and AHD . cameras?

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The following article Khoi Ngo will answer in detail questions about what AHD technology is, what is HD-TVI technology, what is HD-CVI technology as well as help you clearly distinguish & evaluate the advantages and disadvantages of HD-TVI technology. each type.

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The backwardness of traditional analog technology

1. Why was AHD, HD-TVI or HD-CVI technology born?

Along with the development of information technology & computers, the revolution of CCTV camera technology in the past 10 years – as we see it – has had many breakthroughs.

As we saw in the early years of the 21st century, then the camera had very simple features but the price was very high. At that time, CCTV was still an extremely expensive technology product. Their price at that time could be close to a desktop computer..

However, things are different now. With only about a million dong, you can already own a CCTV camera of pretty good quality with many unique features. For example, the ability to control 360-degree rotation, alarm features, high-quality image storage features, Full HD resolution and infrared LEDs…

Back in the early years of the 21st century, see why this AHD, HD-TVI and HD-CVI technology revolution?

AHD, HD-TVI or HD-CVI technology are new generation analog technology was born to “replace” traditional analog technology. But why is that? Let’s explore the quite interesting change right below!

(1) Obsolescence of traditional analog technology:


Traditional Analog technology is obsolete and has to “give way” to AHD, HD-TVI and HD-CVI technology.

Along with the development of image processing chip technology, the camera resolution has reached the threshold Full HD and even higher. While the ability to transmit signals on coax cable according to “traditional analog technology” is having 02 big problems:

Problem 1: Coax cable cannot transmit Video signal farther than 100m. When transmitting far, the signal is almost lost, with image noise and sound noise.Second problem: Full HD image quality is significantly degraded when transmitting over 100m and cannot go further. Thus, it is almost impossible to transmit video signals with higher resolution (4K, 8K).


Analog technology transmits signals directly (without processing)How is traditional analog technology different?

Analog technology uses coaxial cable to transmit signals.

In traditional analog technology (old technology), the video signal is transmitted directly on coaxial cable without any processing. Therefore, the signal is quickly weakened on the transmission line, unable to travel long distances.

(2) Disadvantages of Digital technology (IPC technology for IP Camera)

At that time, IP Camera technology – transmission of signals over internet cables (referred to as IPC technology) – solved the problem of transmitting high-quality video signals.

However, IPC technology still has some disadvantages as follows:

The cost and cost of ip camera is too high compared to analog camera. The cost of network cable is almost twice as expensive as coaxial cable. This makes the cost of large projects (when the cost is not focused on the camera, but puts too much on the cable, creating an unreasonableness). With the works with old coaxial cable infrastructure, it is very difficult to raise the cost. Level up network cable (under wall, ceiling, underground…) And technology IP cameras always have signal delay irreparable. Due to being completely dependent on internet technology and facing some troubles such as: technology of routing, switching, LAN, internet interference leads to video delay when observing in real time.


IPC technology for transmission on Digital cable (Cat5/Cat6) still has many disadvantages

2. The introduction of AHD, HD-TVI and HD-CVI . technologies



In the last years of the first decade of the 21st century (about 2007-2010), the question is how to solve that problem? Detail need 01 new analog technology However, the following key issues must be addressed:

Helps transmit analog images “further” (beyond the 100m mark) and still ensure signal quality at long distance.Can transmit Full HD 2K or higher images still Full HD picture quality or higher.

And the results of those “technology races” are breakthroughs. Those are 03 famous technologies today.


Even better, PoE technology has been invented to help transmit signals – including video signals and power for cameras – over a single coax cable.

PoE (Power on cable). Is a technology that was born to help optimize the cost of power cords for cameras. The term Power on cable means that the “power” signal will go with the “signal cable”. Therefore, the installation of the camera will not require additional wires, helping to reduce the cost of materials and also reduce the cost & time of system construction.

What is AHD technology?

1. What is AHD?

AHD (Analog High Definition) is a technology to transmit high-quality images on coax cable officially released by Korea’s Nextchip in 2014.


Its AHD technology is patented by Nextchip

AHD technology makes it possible to transmit Full HD (or higher) high-definition video signals through traditional coax cables up to 500m without losing image, video, and audio signal quality.


What is AHD?

Technically, AHD technology applies a new generation of Y/C separation. Y/C seperator helps to split the signal to correct signal noise on the transmission line, which can greatly reduce color noise and support better image reproduction.

2. Common types of AHD standards

There are 03 popular AHD standards on the market as follows:

AHD-L (Low): is AHD standard with low resolution. The AHD-L camera offers a lower resolution than the normal HD standard and is cheap.AHD-M (Medium): is the AHD standard for a maximum resolution of 720p (HD equivalent).AHD-H (High): AHD standard for resolutions from 1080p and above (from Full HD and above).

3. Advantages of AHD . technology

AHD technology has broken through the traditional distance limit from 100m up to 500m. In addition, AHD technology for analog-based high-definition video transmission via coaxial cable system while ensuring sharp video quality.

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What are the advantages of AHD technology? Outstanding features of AHD cameras:

According to what Nextchip announced, unlike HD-TVI and HD-CVI, AHD technology does not focus on image compression. It is this that has helped AHD camera technology bring outstanding advantages as follows:

Enhanced ultra-long transmission distance (up to 500 meters over traditional 75-3 coax cable).No video delay because it doesn’t take time to compress and decompress. Improve compatibility with other recorder & camera standards. Improve the processing speed of the graphics chip on the camera and recorder because it does not focus resources on compression and decompression. Provides camera control More flexibility, combined with advanced alerting features. Easy to set up.High resolution: Advanced signal filtering, 3D noise reduction, higher image resolution, better image reproduction. And especially, cost reduction due to no need to concentrate processors. Strong reason for camera.Note:

In addition, AHD is a open standards 3rd party (Nextchip) should have many advantages. The application of camera production will be more widespread, the price is sometimes better than other proprietary standards.

4. Famous chipsets using AHD . technology

AHD technology is used by many camera chipset manufacturers in their chipset manufacturing technology. Sony is one of the most powerful camera application companies. Some famous chipsets can be mentioned such as: Sony Aptina, Omni Vision …

Format Chipset (NextChip) Image Sensor Effective Pixels
AHD 720P/960H NVP2431H Sony IMX225 1280×720
AHD 720p/960H NVP2431H Sony IMX238 1280×720
AHD 1080P NVP2441H OmniVision OV2710 1920×1080
AHD 1080P+960H NVP2441H Aptina AR0230 1920×1080
AHD 1080P NVP2441H Sony IMX222 1920×1080
AHD 960P NVP2431H PixArt 5130 1280×960
AHD 960P NVP2431H Aptina AR0130 1280×960
AHD 720P NVP2431H Aptina AR0141 1280×800
AHD 960P NVP2430H Sony IMX238 1305×1049
AHD 720P NVP2431H OmniVision OV9712 1280×720

AHD Cameras Chipset + Image Sensor

Some other AHD standards: AHD-L – 960 x 576 pxAHD-M – 1280 x 720 pxAHD-H – 1920 x 1080 px3 Mpx – 2048 x 1536 px4 Mpx – 2560 x 1440 px5 Mpx – 2592 x 1944 px

What is HD-TVI technology?

1. What is HD-TVI?

HD-TVI stands for High Definition Transport Video Interface, ie “Communication standard that allows high-definition video transmission”.

HD-TVI technology is developed by Techpoint company

in 2014. Today, HD-TVi technology is used by many manufacturers of cameras and recorders for their security products.



What is HD-TVI?

2. Advantages of HD-TVI . technology



What’s special about HD-TVI cameras? Advantages of HD-TVI technology: Transmission distance on coax cable is from: 300m-500m. Allows transmission on CAT5/CAT5 network cable (twisted cable): 200m. Resolutions can reach: 720p, 1080p (2Mp), 3Mp, 4Mp, 8Mp and higher. Traditional RG59 coax transmission technology (which is the most common type of cable), helps systems Old analog cameras can be upgraded to HD, Full HD without replacing cable infrastructure, at no extra cost. Good transmission of all kinds of video, audio & data signals without interference, no degradation. signal. Allows upgrading the old camera system to HD-TVI technology camera while keeping the entire old coaxial cable infrastructure, without incurring additional infrastructure costs. Disadvantages of HD-TVI:

Because HD-TVI is a standard that uses signal compression technology, transmits on a cable and then decompresses at the receiving device, there are some small disadvantages as follows:

It takes time to compress and decompress, somewhat causing signal delay. More tasks to be handled for the camera chipset.

In fact, according to our assessment, this delay is almost invisible (very difficult to feel). As for IP camera systems (IPC technology), the delay is very clear and you can distinguish it right away.

3. Application of HD-TVI . technology

Chipset HD-TVI technology is mainly used by many major camera companies in the world in their camera and recorder products.



Hikvision is a pioneer in applying HD-TVI technology in the world

4. HD-TVI chipsets manufactured by Techpoint:

HD-TVI 4.0 Video Surveillance Receiver ChipsetsTP2828: 4 Channel Multi Standard 3-8 Megapixel Receiver with 2 x BT.656 output supportTP2829: 4 Channel Multi Standard 4 Megapixel Real Time Receiver with 4 x BT.656 output supportHD-TVI 4.0 Video Surveillance Transmitter ChipsetTP2912: 1-8 Mega Pixel HD-TVI TransmitterTP3801: 720P Image Signal Processor with HD-TVI TransmitterTP3803: 3 Megapixel/1080P Image Signal Processor with HD-TVI TransmitterTP3805: 5 Megapixel Image Signal Processor with HD-TVI TransmitterTP3808: 8 Megapixel Image Signal Processor with HD-TVI TransmitterHD-TVI Automotive Receiver ChipsetsTP2824: Automotive Grade 4 Channel 1080P/720P/D1 Receiver with 4 x BT.656 Output SupportTP2825: Automotive Grade 1 Channel 1080P/720P/D1 Receiver with 1 x BT.656 Output SupportTP2854: Automotive Grade 4 Channel 1080P/720P/D1 Receiver with MIPI CSI-2 Output SupportTP2850: Automotive Grade 1 Channel 1080P/720P/D1 Receiver with MIPI CSI-2 Output SupportTP6806: Automotive Grade 1080P LC D display Processor with integrated HD-TVI receiverHD-TVI Automotive Transmitter ChipsetsTP2912G: Automotive Grade 720P/1080P transmitterTP2801G: Automotive Grade 720P/1080P transmitterTP3802E: Automotive Grade 720P/1080P Image Signal Processor with HD-TVI transmitter

What is HD-CVI technology?

1. What is HD-CVI?


imager_11_20915_700 What is HD-CVI technology – Khoi Ngo – webgiaidap.com Different from 2 open technologies AHD & HD-TVI (provided by a third company – thirth party), HD-CVI is a researched, patented and

Exclusively by Dahua Corporation





What are the advantages of HD-CVI technology? Advantages of HD-CVI: The ability to transmit Full HD signals 2.0Mp, 4Mp, 8Mp. Signal transmission distance reaches 300m-500m on traditional coax cable (equivalent to 300m-500m). Techpoint’s own HD-TVI technology). Helps the old camera system to be upgraded to HD-TVI camera technology without upgrading the signal wiring, coaxial cable and power cord infrastructure, which saves money. and optimize system upgrade costs.Using image & audio signal compression technology to reduce capacity and increase signal bandwidth on coaxial cable transmission lines.

What is HD-SDI technology?





What is HD-SDI technology?

2. Disadvantages of HD-SDI

Initially, HD-SDI is a set of standards to help improve the quality of television and video images. Additional SDI standards have been introduced to support increased video resolution (HD, UHD and more), frame rate, stereoscopic (3D) video, and color depth.

However, the biggest limitation of HD-SDI technology is that it cannot transmit signals over long distances while maintaining the same quality. In other words, HD-SDI technology when transmitting long distance suffers from 02 major disadvantages:

Stable signal is not guaranteed when transmitting over coax cable. Frequent interference, grainy images or even loss of images when transmitting over long distances. Video definition is not guaranteed when transmitting over a distance of 100m by coaxial cable. Comparison of AHD, HD-TVI, HD-CVI, HD-SDI . standards1. What is the difference between AHD, HD-TVI, HD-CVI, HD-SDI and Traditional Analog? In terms of technology, these 05 video transmission technologies have the following differences:

AHD technology:

data separation (Y/C separation) for longer transmission and no interference. HD-TVI and HD-CVI technology:

compressing and encapsulating data (reducing size & protecting data) helps data to be transmitted farther, more compactly, and does not reduce image and audio signals when transmitted.

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Traditional Analog Technology: outdated technology, non-standardization and no data interference. So there are many disadvantages such as reducing image quality and not transmitting far.2. Comparison table between AHD, HD-TVI, HD-CVI, HD-SDISource: internet

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