User manual

Digital BUS-WATCH®
47
Radio Engineering Industries, Inc.
640333
Rev 0 -- 1/1/2006
RECORD MODE: Can be set to either FRAME or FIELD. This sets whether the
unit is recording video fields, or full frames. Frames require more disk-space per
image, so they reduce recording time but provide a better quality image. Fields
reduce video quality but increase recording time.
RECORD QUALITY: This setting corresponds to the compression ratio of the
video data. There are four options: SUPER, HIGH, NORMAL, and BASIC.
SUPER gives the best quality image but reduces the length of recording time.
BASIC gives the longest recording time, but the recorded image quality is
reduced.
FRAME RATE: Has many different options, ranging from 0.5P to 60P. The
number equates to fields or frames per second. The four cameras share the
frame rate, so at 60P, each camera saves 15 fields per second.
These three settings all have a significant effect on recording capacity of a given
hard drive. Below is a chart giving the approximate recording capacity of a
120GB drive at each of the above settings. Drives of larger sizes have
proportionally larger recording capacities.
Note: These numbers can vary significantly with a color vs. black-and-white
camera, frame composition, and light level. This table is representative of 4 color
cameras. A system using a black and white cameras generally has a slightly
higher recording capacity.
Hours of Recording Time with a 120 GB Hard Drive
Field Frame Field Frame Field Frame Field Frame
FPS
Quality
0.5P 0.5P 1P 1P 2P 2P 4P 4P
Basic 10368 5760 5184 2880 2592 1440 1296 720
Normal 7776 4320 3888 2160 1944 1080 972 540
High 5184 2880 2592 1440 1296 720 648 360
Super 2592 1440 1296 720 648 360 324 180
Field Frame Field Frame Field Frame Field Frame
FPS
Quality
8P 8P 15P 15P 30P 30P 60P 60P
Basic 648 360 346 192 173 96 86 48
Normal 486 270 259 144 130 72 65 36
High 324 180 173 96 86 48 43 24
Super 162 90 86 48 43 24 22 12
Figure 46