DVR, NVR and HVR are recorders of images from security cameras.
The big difference between them is in the form of communication with the cameras.
You killed that one?Not yet?So come on, let’s understand each one of them.
DVR (Digital Video Recorder) is the system responsible for managing and storing the images of cameras with analog signal.
Generally DVRs have input for 4, 8 or 16 cameras but it is possible to find in the market some models with different capacities.
The DVRs can be standalone or base PC.
Standalone DVRs are manufactured in a single card that concentrates digitizers, processors, memory, etc.They are usually simpler systems but can perfectly meet the needs of the customer.
Standalone DVRs have a Linux-based operating system and in most cases the operating system is stored in a flash memory thus leaving the disks (HDs) unique for recording images.
The biggest advantage of Standalone DVRs is in reduced size and lower price.
PC-based or industry-standard DVRs are mounted in the same molds as an industrial PC, where each card has a specific function, as well as using some common PC components such as RAM, processor, video card, power supply, etc.
Professional DVRs use a Linux-based operating system stored on a flash memory called DOM (Disk On Module).
The biggest advantage of PC based DVRs is in the processing capacity that allows you to manage images with higher frame rates.
NVR (Network Video Recorder) is the system responsible for managing and storing the images of the cameras with communication over the TCP/IP network or simply security IP cameras via deluxesurveillance.
The NVR can be software that must be installed on a PC with a Windows license or a set of hardware + software that will run on a Linux platform.
There are NVRs capable of managing and storing 4, 8, 16, 32 and 64 cameras, we also have some software that has no camera limit, but this limit is more related to hardware than to software.
HVR (Hybrid Video Recorder) is a system (software + hardware) capable of managing and storing the images of the cameras with analog signal and the IP cameras simultaneously.
Imagine a situation where a customer already owns a CCTV system with 20 analog signal cameras, but he needs to increase the number of cameras to 30, but that customer would like these new cameras to be with high resolution (HD) and consequently IP cameras.
In order to serve this client, we have two options:
1- Keep the current system (DVR) and install the 10 new cameras with an NVR.This is not very good considering the operational issues, it is much more complicated to operate two systems than one.
2- Replace the existing DVRs with HVRs, thus taking advantage of the 20 cameras already installed and including the 10 new cameras, showing a single system.Subsequently the customer can gradually replace the cameras with analog signal by other IP cameras.
Note: The vast majority of HVRs have the capacity to manage and store the images of up to 16 cameras, regardless of whether they are analog or IP.You can have an HVR with 15 analog signal cameras and 1 IP camera, or vice versa.
Undoubtedly, NVRs are the great sensation of the moment, as well as managing IP cameras, recording high resolution images and managing 4 times more cameras than a DVR, they increasingly incorporate features ranging from management modules and reports, systems for reading and recognition of vehicle license plates to complex video analysis systems.