The annunciator is the heart of the device: it processes signals from the keyboard, controls the map light points, the display on the (optional) screen and, of course, plays sounds.
The detectors support up to 200 different messages. Individual announcements or abbreviated versions of announcements can also be reproduced spontaneously as an advertising announcement (so-called rest announcement; please specify in the order).
From a technical point of view, the board is supplied with two types of annunciators: the INVIT-500 does not allow screen connection and remote content change via the Internet, while the INVIT-700 does not have these limitations.
The keypad can be made in two versions: as a numeric keypad for entering the message number (object), or with a language selector for multilingual versions of the boards, or in a version for direct message selection by pressing a button. The keyboards are in metal, antivandal design.
The keypad panel is made of anodised or painted aluminium with engraved markings for the outdoor versions, while for the indoor versions the keypad is built directly into the display case cover glass and has a digitally printed label.
The light points in the map are made up of 3 mm LEDs, standard in green or red and high brightness. If the “you are here” LED is fitted, it is a different colour and lights up when no message is playing. On request, it is possible to connect light points in animation mode, e.g. in the appropriate walking direction or, for example, to illustrate a technological process.
The device can optionally be equipped with an LCD screen. 10″, 21″ or 42″ screens are available in enhanced brightness.
The primary use of the LCD screen is to display additional information to the message the board is playing. This is usually solved by opening a special web page that can be changed by the local administrator, thus changing the content of the board. The content of the page can be, for example, video footage, a sequence of photographs or online resources: a programme with the current theatre programme or an online webcam at the location of the announcement.
Other typical online applications are information about public transport departures (similar to our public transport departure board applications) and other maps.
The displayed web pages can therefore be stored directly in the detector or can be opened online from the Internet. The LCD screen may be equipped with an anti-vandal touch layer and the subsystem may allow launching a web browser and accessing the Internet, with little or no restriction on the accessible range of the web (for example, only the municipality’s website). This feature requires the whiteboard to be connected to the internet (typically via a mobile network).
In practice, it is advisable to install the boards in such a way that direct sunlight does not reach the screens as far as possible.
For exterior versions of signs we usually use special, so-called. vibrating transducers that vibrate the entire windshield surface of the board with sound. This causes the user to perceive the announcement loud and clear in front of the board, but at greater distances the talking board disturbs less than if we were using a conventional, highly directional speaker.
Small versions of the boards are equipped with a classic anti-vandal waterproof speaker.
The interior versions are equipped with an active loudspeaker, located on the top bar of the display case.
The device is capable (as ordered) of operating as a Wi-Fi access point, including possible anti-abuse limitations such as limiting the amount of data transferred or the length of a single connection. This feature requires the whiteboard to be connected to the internet (e.g. LAN, fibre optic or mobile network).
At the top of the board there is (according to the order) an LED strip of lighting with a lifetime of more than 100 000 hours (more than 20 years of regular operation). The LED lighting is switched by a twilight switch or together with the public lighting where the board is fed from the public lighting system.
The device can be operated (according to the order) with 230 V AC (mains or lighting), 12 V DC or solar power.
230 V power supply in combination with the optional backup power supply allows power to be supplied, for example, from the public lighting system that is switched off during the day. Battery back-up power will allow the board to run for 24 hours.
The solar-powered version of the board allows operation in places where no mains connection is available or where it would be difficult to build one. Options for night lighting or LCD display with solar power must be consulted in advance.
Outdoor boards supplied with 230 V must be earthed (earthing strip), fixed boards connected to the 230 V supply must be inspected.
The board is equipped with a twilight switch, which allows the volume of the announcement to be lowered or switched off completely at night and at the same time switches on the board lighting if it is not switched on synchronously with the switching on of the public lighting.
Blind person’s radio receiver (Tyfloset)
(On request): the board acts as an acoustic beacon for the blind and can, for example, announce relevant information about the layout of a square to a blind person.