=
ii
dq (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
mq
=
c
T
q
Step 4: According to Form
all channels in DVR during ala
∑
=
=
iT
mq
×a% (4)
In the formula：a% means alarm occurrence rate
c
i 1
87
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