American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 122)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-117 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

PTZ cameras by their natures are adjustable and these calculations should be

considered for a “home” or “cage” position.

Cameras that provide overviews of interior and exterior locations should have

their focal lengths selected so as to meet the field-of-view requirements of the

facility. However, exit cameras should have sufficient depth-of-field of at least

three to four feet for walking pace objects to ensure that subjects exiting the

facility will be in focus.

Field of view (FOV) relates to the size of the area that a camera will see at a

specific distance from the camera. The field of view is dependent on lens focal

length and camera format size. The FOV width and height can be calculated

using the following formulas: FOV Width = Format (horizontal in mm) X Distance

(in Feet from camera) Focal Length FOV Height = 0.75 X FOV width

Manipulating the FOV formula allows a calculation of the distance in feet from

the camera for a required FOV width. The formula becomes: Distance (in feet

from camera) = FOV width X Focal Length Format (horizontal in mm)

C. Camera Mounts

Manual adjustable mounts shall be provided for each camera. Positive position

locking shall be provided. Cameras shall be located unobtrusively and at as high

an elevation as possible to maximize field of view and reduce vandal access, but

low enough to access using an eight foot ladder. If cameras are located higher

than this, fall protection must be installed per OSHA guidelines.

D. Camera Identification

A discrete camera ID consisting of a minimum of sixteen alphanumeric digits in

ASCII-II code shall be superimposed on each camera video to identify the

camera location including the platform (east/south or west/north bound) location.

E. Wayside Transmission

Video transmission between each passenger station and the ROC monitoring

areas shall be by digital fiber optic techniques. Each passenger station and

TC&C room shall be serviced with sufficient supporting equipment capacity to

add 40% additional cameras for expansion. (Example: Nine cameras plus 40%

equals 13 cameras total.)

The fiber optic network for the CCTV system shall provide equipment at each

station/location for multiple CCTV camera inputs. The optically transmitted signal

shall be recreated at the ROC for distribution to the various monitors.

F. Video Recording System

 All CCTV camera signals shall record video images in real time at the ROC.

Camera signals shall be routed into a recording unit permitting all cameras

to be simultaneously recorded. The playback provision shall be able to

display recorded images.

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 122