System Upgrade Recommendation?

[BrooksL 0]

Good day expert CCTV'rs! Looking for some recommendations to upgrade my existing 4 camera DVR system currently installed and working on my home. Generally speaking the old system, purchased about 5 years ago has worked ok, but I really want to improve on the video quality.

 

I currently have the following:

- 4 x weatherproof day/night CCD Color Dome Cameras - 1/3" 480 Line Sony CCD

- 1 x DVR AVC-760 4-CHANNELS - generic brand - mpeg-4

 

Specifically can I upgrade my DVR only and get a noticeably improved picture quality? or do I have to replace the whole system? I really could use an expert recommendation. Must support remote access viewing over the internet, iphone & android tablet support.

 

THANKS!