The Microsphere assembly shall comprise of
a high-speed pan/tilt assembly and a high resolution colour or colour / mono camera.
The
colour camera shall incorporate a ¼" CCD interline transfer device.
The model shall provide a horizontal resolution of 470 lines, and shall be capable
of delivering a usable video signal with a scene illumination better than 1.0
Lux under standard camera operating conditions.
For low light colour performance
the camera shall support a colour integration mode to give a useable video signal
with a scene illumination better than 0.4 Lux.
For extended low light performance
the camera shall change over to mono mode after colour integration. The camera
shall subsequently change into mono integration mode, to deliver a useable video
signal with a scene illumination better than 0.01 Lux.
The camera shall feature
a signal to noise ratio of better than 50dB.
The video output synchronisation
shall be 2:1 interlace and shall observe the PAL standards. Line-lock with automatic
phase adjustment shall also be provided.
The lens shall provide an optical
zoom range of 18x (4.1 - 73.8mm) The camera assembly shall provide 8 x digital
zoom giving an overall minimum combined zoom range of 144 x.
The lens shall
have support for autofocus operation with manual override. The lens shall also
support auto-iris operation with manual iris override.
The pan/tilt mechanism
shall incorporate a sealed precision slip ring to provide 360 degrees of continuous
rotation.
The tilt drive shall be stepper motor controlled, driving direct
meshed cogs.
The pan drive shall be via a precision motor and belt system.
These motor systems shall control the acceleration, speed, and deceleration of
the motors to ensure smooth, precise, and accurate movement.
Precise manual
panning and tilting shall be achievable through a combination of variable speed
operator controlled ranges and automatic adjustment of these speed ranges shall
be dependent upon zoom factor. Pan speeds shall range from 0.1 to 400 degrees
per second.
Tilt operating speeds shall range from 0.1 to 200 degrees per
second.
The Microsphere assembly design shall feature support for telemetry
signalling via
RS 485 twisted pair data or co axial telemetry.
The
RS 485 twisted pair telemetry shall support up to 30 daisy chained Microspheres
up to a maximum distance of 3,000metres. The telemetry receiver/driver shall provide
all voltages for camera controls, pan and tilt functions and all motorised lens
functions.
The RS485 transceiver shall be opto isolated from subsequent circuitry
on the Microsphere receiver.
The video output stage of the Microsphere
shall feature a video launch amplifier, allowing for adjustment of gain &
lift for video signal equalisation between the Microsphere and control equipment.
The video output stage shall also feature video isolation to minimise the possibility
of earth loop interference via the video co axial cabling.
The Microsphere
shall feature battery back up of all programmed settings to prevent loss of stored
settings during power down.
Upon the resumption of the mains supply following
a power failure the microsphere shall relocate the pre power down condition and
resume any active functions, such as a tour.
The Microsphere control system
shall support on-screen programming of Microsphere parameters, including alarm
actions and default states, and home position.
Fixed passcode protection
shall be provided to prevent unauthorised access.
The complete Microsphere
assembly shall be capable of operating to full specification with an applied voltage
of 24 VAC or 12 VDC.
Low voltage supply shall be provided by the manufacturers'
compatible power supply.
The Microsphere shall incorporate "plug &
play" technology for ease of installation and service. The "plug &
play" technology shall offer a range of compatible mounting hardware to provide
flexible mounting options.
The microsphere assembly design shall support
8 alarm inputs to allow "normally open" alarm device signalling to be
connected to the microsphere.
Alarm signals fed into the Microsphere head
shall be directly related to preset positions so that under active alarm conditions
the Microsphere seeks the relevant preset.
A software timer shall provide
a 10-second dwell at the alarm preset related to the active alarm input.
The
microsphere assembly shall support two three-pole voltage free relay outputs.
One relay shall be activated under local alarm condition and de activated when
all local alarm conditions and software timer have cleared.
The second relay
shall provide an auxiliary output for external equipment and shall be operated
from the system control keyboard via an auxiliary key.
The Microsphere shall
feature limited support for third party non-VCL protocols. Such protocols shall
already be present in the embedded firmware of the microsphere.
3.0 Features
The
Microsphere shall support 128 presets and 4 autopan tours. Autopan tours shall
also support sector identities to provide sector information based on preset pan
location information during the tours.
The Microsphere shall support mimic
tour function. Such tours shall not rely on presets and are "learned"
by memorising all microsphere functions for a time frame of up to three minutes.
Four mimic tours shall be supported of up to three minutes' length each.
The
Microsphere shall support privacy zones. The privacy zones shall be scaled according
to the lens zoom ratio, allowing for the normal video image with superimposed
privacy zones. The Privacy Zones shall be rectangular in shape and up to 28 such
zones may be programmed.
Whenever multiple Privacy Zones are present on
a single image, the Microsphere shall be capable of displaying complex shapes.
Complex displays shall have the capability to form larger / single displays when
the lens zoom ratio denotes such a requirement.
Full privacy functions shall
be available only in conjunction with control equipment that supports such functionality.
The
Microsphere shall support home position. The home function shall be based on a
period of inactivity timer. This timer shall start at the end of the last command
received and if no further commands are received for the programmed period of
the timer the microsphere shall execute the home function.
The home function
may be defined as:
1) Return to preset 0
2) Enter autopan
tour 1.
