ClearView Hawk04-HD, Руководство пользователя

Страница: 136 / 155

Appendix A HDD Capacity Calculation
Calculate total capacity needed by each DVR according to video recording (video recording
type and video file storage time).
Step 1: According to Formula (1) to calculate storage capacity
q
i
that is the capacity of each
channel needed for each hour, unit Mbyte.
q
i
d
i
8 3600
1024
(1)
In the formula:
d
i
means the bit rate, unit Kbit/s
Step 2: After video time requirement is confirmed, according to Formula (2) to calculate the
storage capacity
m
i
, which is storage of each channel needed unit Mbyte.
m
i
=
q
i
×
h
i
×
D
i
(2)
In the formula:
h
i
means the recording time for each day (hour)
D
i
means number of days for which the video shall be kept
Step 3: According to Formula (3) to calculate total capacity (accumulation)
q
T
that is needed for
all channels in the DVR during scheduled video recording .
q
T
∑
c
m
i
(3)
i 1
In the formula:
c
means total number of channels in one DVR
Step 4: According to Formula (4) to calculate total capacity (accumulation)
q
T
that is needed
for all channels in DVR during alarm video recording (including motion detection) .
q
T
∑
c
m
i
× a%
(4)
i 1
In the formula
：
a% means alarm occurrence rate
124