Specifications

12
Hours per Gigabyte
(Per Camera)
Compression ratio (X:1)
10 15 20 25 30 35
Fields per second
Highest Quality Lowest Quality
60 0.13 0.19 0.26 0.33 0.39 0.46
30 0.26 0.39 0.52 0.66 0.79 0.92
15 0.52 0.79 1.05 1.32 1.58 1.85
10 0.79 1.19 1.58 1.98 2.38 2.77
5 1.58 2.38 3.17 3.96 4.76 5.55
4 1.98 2.97 3.96 4.96 5.95 6.94
3 2.64 3.96 5.29 6.61 7.93 9.26
2 3.96 5.95 7.93 9.92 11.9 13.8
1 7.93 11.9 15.8 19.8 23.8 27.7
Calculating Required Hard Drive Size
You can also calculate the required Hard disk space for a system with the following equation:
(H x R)
--------- x 1.26 = S
C
H= Hours of recording time needed
R= Rate of image capture, (images per second)
C= Compression ratio (ex: 15 for 15:1)
S= Size of Hard Drive, in Gigabytes
Example: A Customer wants to use DVMS 400 to record 4 cameras, with each camera updated every second.
Therefore, the capture rate is 4 fps. The 20:1 compression ratio gave acceptable picture quality. The Customer
wants enough Hard drive storage to record for 24 hours. (Note: The rate of image capture refers to the total
capture rate, regardless of camera inputs. For example, if the customer has 15 cameras, and he wants every
camera captured at a rate of 2 fps, then the total capture rate is 2 x 15 or 30fps)
(24 x 4)
---------- x 1.26 = 6.04 GB
20