We intend to provide you a complete guide to 720p/1080p AHD DVRs. When selecting the AHD DVRs, it should be easy just like selecting an analog DVR for CCTV cameras. However, it turns out AHD product selection is far more complicated. The number of channels, the recording resolution, maximum fps are three most important parameters when we plan to choose a DVR, this is also the simple criteria to choose AHD DVRs.
This guide contains the frequently asked questions of AHD DVRs, if you think this article is helpful, please share it to your social media pages.
1080N is the half resolution of 1080p, that’s 960x1080. AHD DVR supports 1080N resolution can connect with 2-megapixel (1080p) AHD cameras.
1080P=1980*1080=2073600, 720P=1280*720=921600, 1080N=960*1080=1036800, So 1080N resolution is higher than 720p. In terms of image quality, 1080N adopts progressive scan sampling, its image quality is close to 1080P.
Using different CMOS image sensors is the only difference between 1.3-megapixel AHD cameras and 1.0-megapixel AHD cameras, the reset of hardware design keeps the same. It looks like 1.3-megapixel resolution will be better than 1.0 megapixel, however, because the AHD receiver chip only supports 720p or 1080p resolution, the current AHD DVRs support two resolution format - 720p and 1080p.
Currently, there is no 16-channel AHD DVR supports 1080p resolution real-time (25fps/30fps) recording. However, you can find 16-channel AHD DVRs support [email protected] or [email protected] recording. AHD products are designed for low-end analog video surveillance market, so the AHD DVR developers have no plan to devote time and money on manufacturing the high-end products. By the way, the other HD analog solution such as HD-TVI and HD-CVI also follow this strategy.
In my humble opinion, selecting the right AHD DVRs to work with AHD cameras is a bit hassle. The reason is AHD DVRs provide many different recording formats which we can't fully understand. Herein, we provide you the information about these recording formats.
NVP6114A: FHD AHD™ DVR RX, CVBS/COMET/AHD 1.0/AHD 2.0 Simultaneous Input, Up to 2CH 1080p @ 25/30fps, it provides DVR solutions with FHD 2CHs or HD 4CHs. It offers system-friendly development environment so that users can easily configure input formats out of CVBS, COMETor AHD1.0 per channel. To ensure image quality under coax environment, advanced signal filtering technology is applied. It also comes with user-friendly RDK.
NVP6124: FHD AHD™ DVR RX, CVBS/COMET/AHD 1.0/AHD 2.0 Simultaneous Input. Up to 4CH 1080p @ 25/30fps. It provides DVR solutions with FHD 4CHs. It offers system-friendly development environment so that users can easily configure input formats out of CVBS, COMET AHD1.0 or AHD2.0 per channel.
NVP6134: 3.0 Megapixel Universal AHD™ RX. Max resolution 4CH 1536p @ 30fps. Equipped with Universal AHD™ Technology for the first time among the AHD™ product family, NVP6134 delivers highly robust and versatile video decoding solution for HD analog DVR systems. It supports [email protected] RT 4CH DVR systems with 4-port RX outputs. Thanks to its Universal Technology, users can now enjoy unrivaled system flexibility that is powered not only by backward compatibility for AHD formats, but also by interoperability between non-AHD formats.
As we previously mentioned, NVP6124 (AHD 2.0 RX) as the receiving chip, can allow users to adjust each channel's resolution format including 960H CVBS/Comet, 1280H CVBS/Comet,720p (AHD), 1080p (AHD). Therefore, the hybrid DVR can simultaneously display different format resolution on 4-channel split view window. Back compatible with existing security cameras is the advantage of hybrid DVR. Most of AHD DVRs are hybrid type, they accept different video signals and recording resolution format (D1, 960H, 720p, 1080p).
If you forget the AHD DVR password, you have to contact the reseller,and giving the current data & time displayed on your DVR to them. They will use a tool called [Super Password] to generate a temporary admin password, using this password you can login to reset the DVR or modify the password. Please note the generated password will expire after one day, and using the hardware reset (like taking out the button battery on motherboard) will not reset the password.
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