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It is also worth mentioning the basic benefits of digital recording of audio / video systems, CCTV ², which include: * Digital recording provides high quality audio data and video. * High frequency recording and display allows for dynamic video. * Remote monitoring and archiving through the IP network. * Ability to browse archival records without the need to retain the current registration. Elimination VHS makes it easy to archive video recordings. The main building block for any modern system is a closed-circuit television recording equipment audio and video, ie. digital recorder, or DVR computer ¹ card, without which correct vision systems work is impossible. Regardless of whether we are dealing with the recorder or DVR card, each of these solutions provides conversion of the analog signal into a digital standard (video compression: MJPEG, MPEG-4, H.264, etc.), so it is capable of recording HDD hard disk (local or external). At first glance, both of these solutions offer the same thing, but as we look at the closer we can see some differences, which determine the usefulness of one or more other device, in particular CCTV system.