Introduction
DVR is also known as a digital video recorder. DVR is an electronic instrument that records video in a digital form to any hard drive. Mass storage devices include a disk drive, USB flash drive, SD memory card, SSD, and more. Unlike IP cameras, these devices do not connect to the internet. They constitute a part of a closed-circuit system. They connect to devices and not any external devices.
Talking about micro DVR, it’s a small form factor DVR such as spycam, or helmet cam. It includes image sensing as well as recording function.
DVR is not the only device that helps us to record videos. There is one more device called NVR that can help us achieve the same goal. We will discuss it in the further articles.
DVR SYSTEM COMPONENTS:
⦁ Analog Cameras: DVR systems use CCTV cameras. This is the primary reason behind its low cost compared to NVR systems. Most of the DVR cameras are less complicated and moreover less expensive also. Few of its features include:
⦁ Easy Remote Viewing and playback feature.
⦁ 4K Ultra HD video support.
⦁ Step-by-Step guide and live support.
⦁ Long-distance video transmission.
⦁ USB backup.
⦁ Digital and optical zoom feature.
⦁ Unlimited access to your footage.
⦁ Free remote viewing using any gadget(smartphone, computer, and tablet)
⦁ Coaxial Cables: Analog camera connects to the DVR using coaxial cables. These cables do not supply power to the camera. So, we need two cables. One for power supply and another for video transmission. It has a limitation on audio transmission. Installation is a challenge as it is wider than an Ethernet cable.
⦁ AD Encoder: AD Encoder processes raw video data into viewable footage from the camera.
DVR has a micro USB port that reads the data on the card. It also charges the battery.
DVR FEATURES:
⦁ Many source inputs
⦁ External monitor output
⦁ I/O connection for PTZ camera
⦁ Notification in the issue of connectivity
⦁ Mountable in a server rack
⦁ SOFTWARE FEATURES:
⦁ Users can capture an image
⦁ One can set the resolution
⦁ Alarm, event, and time search function
⦁ Video analysis feature
⦁ The multi-channel audio recording feature
DVR ADVANTAGES AND DISADVANTAGES:
ADVANTAGES:
⦁ Easy handling
⦁ Low data consumption
⦁ Less expensive
DISADVANTAGES:
⦁ Lower resolutions compared to network recording
⦁ Local connectivity is a must
⦁ Complex installation
⦁ Incompatible with IP camera
⦁ Separate power supply needed
TYPES OF DVRS:
There are three main types of DVRs:
⦁ Embedded DVRs: It is a stand-alone device that gets its input from a CCTV camera. It is then stored in a local HDD in a digital format. These systems are less vulnerable to viruses, hackers, and other harmful attacks.
⦁ Hybrid DVRs: These type of DVR system takes video input from both CCTV and IP cameras. One can prefer two types of Hybrid DVRs:
⦁ CCTV cameras in less vulnerable areas.
⦁ IP cameras for high-revolution in high-risk areas.
⦁ PC-based DVRs: Personal computers have them pre-installed with them. It comes installed with a network card, motherboard, video card, HDD, and DVR capture card.
WORKING:
Some of these system powers up the batteries while many other needs an electric system. They use wireless transmission and don’t need a cable from the camera to the receiver. This makes them easier to hide. And because of its small size, we call it a micro DVR.
Light passes through a lens that focuses it on a small grid having light detectors. In a black and white camera, each detector focuses only on a particular place in the image. In a colored camera, detectors measures only red, green, and blue light. A group of three detectors combined together shows the color of light at a particular place. Some cameras also have motion detectors. And also the motor that follows any movement.
Transmission of an image takes place when the camera converts the image into a radio signal. The receiver then receives the signal and converts it into an image. We can even record the images on any storage device. The receiver will only store a couple of frames, creating a time-lapsed image. It saves a lot of storage space. It makes reviewing the tape later.
CONCLUSION:
The world’s smallest DVR is only 2 inches wide. But still, it produces great quality resolution. DVRs systems are efficient. Standard DVR has the size of the DVD player. The front of the DVR has buttons and switches to control the DVR. On other hand, micro DVRs are very small. Micro DVRs use RAM (Random Access Memory) is a memory storing unit. Micro DVRs use CODEC (Compression/DECompression) for compressing the files. CODEC shrinks the size of the video while maintaining the quality of the video.
Micro DVR takes advantage of this to the most extent to record the largest recording time.