TVI vs. AHD vs. CVI : What is the difference between TVI, AHD & CVI

  • What is HD-AHD?
  • What is HD-TVI?
  • What is HD-CVI?

HD-CCTV (High Definition-Closed Circuit Television) is CCTV’s response to the IP cameras high definition image quality. This technology can transfer uncompressed high-definition video over point-to-point coaxial cables. The biggest advantage we saw at the advent of HD-CCTV was the fact that newer HD-CCTV cameras did not require cabling upgrades. The original coaxial cables from the CCTV era had enough unused data spectrums that they could be used for the new HD-CCTV cameras. This made it easy to install brand new cameras while not requiring to overhaul your entire cabling system.


What is HD-AHD?

AHD CCTV is an analogue high definition closed-circuit television video surveillance standard that benefits from existing coax cable to transmit 720p and 1080p video resolutions HD video from security cameras to DVRs. AHD is able to transmit up to 1080p video resolution (1920 x 1080) in an uncompressed format over the same standard coaxial cable that is used for standard CCTV cameras.

This uncompressed video format is able to transmit over longer distances than either HD-SDI or Network IP cameras and without the latency and bandwidth issues that are so regular with IP Cameras.

In addition, AHD is able to transmit video, audio and control (OSD or PTZ) over a single coaxial cable instead of requiring separate cables for each transmission. Also, it is cost-effective.


What is HD-TVI?

TVI lets customers who already have run BNC cable, the capacity to upgrade to an HD solution without changing any wiring. One of the best things about TVI is that you can upgrade cameras consistently. TVI recorders (TVI DVRs) are Backward Compatible with Analog Cameras – if you plug an analogue camera into a TVI recorder it will identify that it is receiving analogue rather than TVI’s digital signal and record in analogue; if you plug a TVI Camera in it will recognize the digital signal and record in HD. As the video is compressed, TVI is perfect for upgrading to HD if you have already run BNC cable, but will not replace IP cameras as the dominant cameras of the future.

TVI recorders can gain signals from TVI cameras or Analog cameras. TVI is a transitional technology to help people with already existing cable get higher resolutions. All new installations should use IP cameras and NVRs as IP can already do 5x the resolution as TVI and IP cameras are considerably easier to install.

Contrasted with IP cameras, TVI cameras require Power Adapters (Wall Plugs) or Power Supplies (Power Distribution Boxes). Power distribution boxes are highly suggested, as power adapters don’t have any surge protection. TVI cameras use Siamese Cable and BNC Connectors.


What is HD-CVI?

HD-CVI (Composite Video Interface) was advanced by Dahua in 2012 and began to saw wide release in 2014. This technology was progress for CCTV cameras as it brought HD images and allowed for high-definition analogue images to travel well over four hundred and even five hundred meters of cable. 


What are the differences HD-CVI vs HD-TVI vs HD-AHD?

So what are the main differences between these technologies (cvi, tvi, ahd) ?

For customers, the most important thing is the split in how these technologies encode videos or, to be more specific, in their DVRs. While IP cameras can encode from the camera itself, as IP cameras are primarily tiny computers, HD-CCTV’s send their data to DVRs for encoding. The problem is that each technology must use its own DVR. You cannot cross an CVI camera with an TVI DVR, for instance. This is important as it means the consumer will be sticking with the technology they purchase first.

(Note: Initially, even old CCTV cameras did not work with newer DVR’s, but some new DVRs have amended this. For instance, HD-CVI’s Tribrid DVR, which supports analogue, HD analogue, and IP channels. Having such a DVR lets one slowly upgrade their camera system instead of being forced to do a whole system replacement just because of a bottleneck at the DVR. Nevertheless, no new DVR has yet to let these three HD-CCTV technologies communicate with one another. If you buy an HD-DVR for HD-CVI technology, then you best stick with HD-CVI cameras or otherwise you will need to buy a new HD-DVR!)

Another large difference is just who is manufacturing these technologies. HD-CVI products are both advanced and manufactured by Dahua. Based out of China, Dahua surprisingly does very little marketing, although their HD-CVI technology can at times be found masked by behind other names like HD-AVS or HD-MPX.

Contrastingly, HD-TVI was developed by Techpoint, but Techpoint is a chipset manufacturer. HD-TVI products are instead sold through other manufacturers, most primarily Hikvision which, as mentioned, is the largest camera manufacturer in the world, and LTS Security, which stands as the largest reseller. HD-TVI was also made to be open-source, so there are a lot of smaller manufacturers moving HD-TVI products around the market. HD-AHD is the most notorious for being distributed by no-name brands, which means its price point is also considerably lower than its two competitors. Nevertheless, as mentioned before, HD-AHD was also recently picked up by Hanwha Samsung which makes it much more formidable on the market today and especially going forward.

While these cameras have few technical differences, you are possibly to see quality issues depending on who you are buying them from. A no-name cheapo brand is definitely going to be more interested in cutting costs to ship out a low-cost product. You don’t just magically cut manufacturing costs, quality is going to be taking a hit somewhere. If you are a customer, you just need to keep in mind that you get what you pay for. If you’re seeing giant gaps in pricing between similar products then you also need to be looking at who is manufacturing the product.

Here provide some products that supports tvi ahd cvi cvbs technologies :

4 in 1 video output (switchable TVI/AHD/CVI/CVBS)
> 5MP DS-2CE76H0T – 4 in 1 video output (switchable TVI/AHD/CVI/CVBS)
> Prolux PXD-5216AN-4KL-16P 16CH POC 4K DVR Support HDCVI/AHD/TVI/CVBS/IP video inputs
> Dahua UTC Controller PFM820 – Support different formats (HDCVI/AHD/HDTVI/CVBS)> Video Balun RJ45 (Big Size) – HD CVI/TVI/AHD


Finally, these technologies (tvi/ahd/cvi/cvbs) are not that different from one another. You can actually drive it down to the overly detailed technical levels if you want, and debate about the differences between PO3100K+DH9801 and OV9712+NVP2431H sensors, but it’s just not that important to the average camera consumer. What most needs to be understood are these two factors:

– DVR’s cannot communicate across technologies.

– Manufacturer reputation is crucial to buying a reliable product.

A complete guide to choosing correct CCTV camera suppliers

People are usually worried when they leave office or house. After locking, they walk in reverse, And run back to keep guard over their property. Indeed, it is not possible to be in two sites at the same time. We can’t have a trip to the store and expect to know what’s going on in our homes. We can install locks and security alarms, but nothing is failsafe. If you want to keep an eye on what’s going on around your business or home, CCTV suppliers UK may calm your anxiety.

CCTV ; Best solutions for surveillance

Closed-Circuit Television or CCTV is a system of devices that allows you to monitor or record activities in and around a place for security purposes. In fact, CCTV trade suppliers provide you with images of people in your homes and businesses or in public space including the city centers, streets, airports, and on local public transports. CCTV images can be used as proof in court. CCTV suppliers are committed to reducing crime and ensuring that the city is a safe place to live, work, visit and socialize.

CCTV trade suppliers have been around for decades, but improvements in recent years make them even more effective at arresting criminals. CCTV reseller UK supply a wide range of security cameras, all kinds of Security cameras has its own specific characteristics. Although some are large and out and might serve merely to prevent criminals from nearing a home, other cameras are small and purposed to stay secret from sight.

If you’re looking for setting up some type of CCTV to view events live, and recorders archive footage for later reference, or demanding to find the best Wholesale CCTV camera suppliers, there are a lot of questions to ask yourself before getting started.

To choose the correct security camera supplier for certain situations, follow this article.

How To Choose ?

There are 3 tips to be considered before choosing a CCTV:

1- Do you want indoor or outdoor CCTV?

There are some differences between indoor and outdoor CCTV which you have to know. The important distinction is their ability to withstand the different situation they are located in.
For example, we all know the UK weather is very changeable, one day it’s freezing then the next, raining and shortly afterward temperatures can rise. You can control the temperature indoors, but not outside! Outdoor cameras need to be able to face all types of weather such as rain, moisture, snow, extreme heat and cold, even wind.
In addition, Outdoor CCTVs are more tampered with, so they are generally made of more long-lasting materials, like metal. Even sometime they should be housed in a casing in order to prevent easy removal. So you should choose UK CCTV Supplies with high-quality CCTV equipment. On the other hand, Indoor CCTVs can be smaller, more lightweight. They often aren’t waterproof and aren’t built to the same strength and extreme standards that outdoor CCTVs are.


Indoor CCTV


Outdoor CCTV


2- Do you need night-vision CCTV or not?

CCTV needs light to be effective, so if you’re serious about CCTV, you should provide the right lighting for it. But how can a CCTV see in the dark? Remember, light is electromagnetic radiation within a certain portion of the spectrum. The word light usually refers to visible light, which is visible to the human eye. Visible light is usually defined as having a wavelength in the range of 400nm to 700nm. Infra-Red 850nm and 940nm are commonly used in night-time CCTV surveillance cameras.
The human eye is tuned to the visible light part of the electromagnetic spectrum, typically 400nm (violet) to 700nm (red). Human eyes best operate in the middle of the visible light spectrum detecting green colors easily, whilst being able to detect certain color reds and violets. Unlike the human eye, CCTV cameras are able to see beyond the visible light spectrum in particular Infra-Red wavelengths (850nm and 940nm).
CCTV trade suppliers should provide security cameras come with night vision (infra-red camera) which are still able to see things even if it’s pitch black. If you don’t know what we’re talking about, then you’ve probably at least seen night-vision footage from those ghost-hunting TV shows—that black and the white or black and green look is all too familiar.
If you’ve ever looked at the front of a security camera, you’ve probably noticed that it’s covered in a handful of small LED bulbs. This is the IR light, and when it gets dark out, these lights turn on and act as a floodlight of sorts, dousing the camera’s field of view with infrared light. Finally, you should make sure that you want night-version camera or not?

HYBRID-1080P-Varifocal-2.8-12mm-Lens-IR 60m-1/2.7-SONY-CMOS-Sensor-ProluX-CCTV-Bullet-Camera-1080P-Varifocal-2.8-12mm-Lens

Night-vision CCTV

3- Do you require a wired or wireless CCTV ?

CCTV systems collect your security footages in one of two ways: through a wired network or a wireless network. Both of them have their own advantages and disadvantages.

Wireless system:


  1. Easy to move and quick to set up.
  2. Flexible.
  3. Portable (you can transmit videos to your computer, tablet or mobile)
  4. It can be installed in many rental locations that don’t want placing the wire in the wall.
  5. More efficient in the long run, (This is because a camera requires fewer lines for more features and can deliver higher-quality footage that can be remotely accessed and stored, which removes the possibility of someone breaking into your home and destroying past footage.)


  1. Need Wi-Fi networks.
  2. Risk of being hacked.
  3. Expensive.
  4. Poorer picture quality.

Wired systems:


  1. Reliability (Wired security systems are not susceptible to interference from wireless signals due to the physical connections between the camera, recorder, and router.)
  2. Greater variety of camera styles available.
  3. Wired cameras can provide video resolutions at HD and beyond, transmitting large amounts of data over cabling.


  1. Take a little more time to set up.
  2. Less flexible.
  3. Vulnerability to power outages (If your property loses power, so will your security system.)

Now that you know the pros and cons of wired and wireless security cameras you can make an informed decision on what kind of system is optimal for your workplace or home.