1024
3600
8
÷
×
÷
=
i
i
d
q
(1)
In the formula:
means the bit rate, unit Kbit/s
tep 2: After video time requirement is confirmed, according to Formula (2) to calculate the
ch channel needed unit Mbyte.
×
×
(2)
In the formula:
means the recording time for each day (hour)
means number of days for which the video shall be kept
a (3) to calculate total capacity (accumulation)
that is needed for
all ch
ring
scheduled video recording
.
c
i
i
1
(3)
In the formula: means total number of channels in one DVR
ula (4) to calculate total capacity (accumulation)
that is needed for
rm video recording (including motion detection)
.
i
d
S
storage capacity
m
, wh
i
ich is storage of ea
i
m
=
i
q
i
h
i
D
i
h
i
D
T
q
Step 3: According to Formul
annels in the DVR du
∑
=
T
m
q
=
c
T
q
Step 4: According to Form
all channels in DVR during
ala
∑
=
=
i
T
m
q
×
a%
(4)
In the formula
：
a%
means alarm occurrence rate
c
i
1
87
