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Zonal Broadcasting Systems

ACEN Zonal broadcasting system is designed to broadcast announcements or musical programs in schools, colleges, large buildings like hospitals, factories, railway platforms, airports, offices and similar places where announcements are required to be made in selected zones. It also provides a facility to receive the program from the zonal speaker back to the announcer.

Central Console

Junction Box

The basic central console SBC400 B/ SBC 400BM provides the audio control facility for 20 zones (locations). This can be expanded to 40 zones with the addition of extension module. Thus the basic central console can address up to 40 zones.

For addressing more zones, an expansion console is provided. This can take up to 3 extension modules of 20 zones each.

Thus the maximum number of zones that can be addressed in this system is 100.
Power amplifiers are not included.

Construction:

The console is a table top mounting cabinet type. It is wired to cable junction boxes providing one junction box per 20 zones. These junction boxes are wall mounted for ease of wiring.

Programme inputs:

ACEN zonal broadcast console accepts two microphone inputs for live announcements and one line input for broadcasting recorded programs from a tape recorder/ CD player/ radio receiver etc. Individual level controls are provided for all the three inputs. A Master level control is provided on the three combined inputs.

Monitoring:

One Monitor Loudspeaker or a Headphone or both can be connected to the console for monitoring the outgoing program – BROADCAST

A bar-graph level indicator is also provided to monitor the volume level of Broadcast.
A special facility is also available in the ACEN zonal Broadcast console SBC 400BM. The monitor speaker or the headphone can be also used to monitor the proceedings in any selected zone in the RECEIVE mode.
A loudspeaker off/on switch and a volume control is provided. The LED indicator is optionally provided for alerting the classroom from which response is being received. LED facility is provided & quoted on request.
A CHIME signal always precedes any announcement. A CHIME level control is also available.

Zone selection:

Announcement can be made in a selected zone or in a preformed group of five zones. Up to 4 preformed groups can be made in a 20 zone console and up to 8 preformed groups can be made in a 40 zone console. A special group for one time use can be also formed to include any desired zones.

All Call facility:

An ‘All Call ‘ facility is available which enables broadcasting to all the zones of the module by pressing a single switch.

Public Address:

A special output is provided from the console for connecting to a PA amplifier. This can be used to make announcement on a PA system for outdoor use.

Zonal Paging System

Industrial paging :

ACEN Zonal Paging PA system is an audio announcement cum intercommunication system. By default, all stations have equal priority . It is intended to be used for making general announcements in selected zones of large areas, including noisy areas. It also includes an intercommunication system where a 'caller' needs to contact the 'called' person in a certain zone- the called person may not be near a telephone. He may subsequently speak to the ‘caller’ through the handset. Several zones may be selected at a time forming a temporary group for broadcasting the announcements.
The standard system configuration is for a maximum of 15 zones.

A 'station' consists of a 'Terminal' and a 'loudspeaker system'.
The Terminals are offered as.
1. Wall mounting Terminals
2. Tabletop consoles.

The Terminals:

The wall mounting Terminals are environmentally protected ruggedly constructed Terminals that can be mounted on a wall, column, or on a pipe grouted to the flooring.

These Terminals consist of following features:

· A set of switches to address a called person (or announce in a Zone). Several zones may be addressed at a time by forming a temporary 'group'. A separate switch is provided to select 'All' zones at a time.
· A handset that consists of a close speaking, noise canceling microphone and a headphone for private listening.
· A 'BUSY' indicator indicates that the system is busy attending some other caller.
· A 'Ready' indicator indicates that the system is free to use.
· A 'caller id' indicator indicates the station from which announcement is initiated. If the system is 'BUSY' caller id appears on all stations.
· A loudspeaker-driving amplifier with 120 Watts power rating. External Booster amplifiers may be used if more
speakers are required at some stations. 100V speaker line is available.
· Facility to connect external loudspeaker/s that receive announcements from remote stations as well as from the same(LOCAL) station.
· A built in volume control provides a control on the sound output of the external loudspeaker. This can be adjusted with a screwdriver.
A Handset with a ‘Press to Talk’ switch.

· A hook-switch on which the handset will usually rest. When the handset is off hook, the loudspeakers of that zone will be defeated and the headphone in the handset will work.
· A built in loudspeaker receives announcement from remote station if the handset is on hook.
· The microphone of the handset is ‘ON’ only when the ‘Press to Talk’ switch on handset is pressed. This reduces surrounding noise while listening through the headphone.
· A 'Private Channel' switch that when pressed mutes the loudspeakers of that station and allows a one to one communication through lifted handsets. Dual private channel models are available. (See accessories.)
· The electronic circuit inside, provides a 'side tone' i.e. the sound from the microphone of the handset is also heard in its headphone (bio-feedback). This helps in creating confidence while speaking into a microphone.
· The station needs mains powering with 230Volts 50Hz. Other supply voltages on request.
· Each station can be assigned its unique ‘id’ with internally selectable link.
· A Station with auxiliary module has priority over all the other stations.
· An 'Auxiliary Function' module can be inserted in any station. This module contains a facility to store prerecorded announcements that can be played in desired stations.
This 'Auxiliary Function' module also provides a 'remote control' Terminal which, when actuated from a system like fire alarm, generates pre-selected messages or a hooter sound in all the zones. A telephone/EPBX line input is also provided. When a ring tone is received on this line the announcement received from the caller will be routed to all stations on first priority next only to fire alarm.
Background music can be played in required zones that is interrupted during announcements.

Installation:

Signal and control to all the stations are wired in a looped fashion. I.e. a single multi-core cable is run all across the length of the floor. Wherever a station is to be installed, the multi-core cable is intercepted and a plug is soldered to both the ends of intercepted cable. The Terminal provides inlets to both the connectors for a 'loop- through' connection.

At each station, a 230 volts mains point is to be provided by the employer. If not provided, then a separate mains wiring will be needed besides the multi-core cable.

Loudspeakers are mounted at suitable locations and the speaker cable is required to be brought to the Terminal through a conduit. Loudspeaker can be oriented for the desired angle/area of coverage. The rating and type of loudspeaker is decided according to the site requirement.

Choice of loudspeakers:

1. Sectoral Horn with high compression driver:

For the best clarity and high sound intensity in noisy atmosphere the best choice is a high compression driver with a 90X 40-degree cast sectoral horn. This works with a 400Hz corner frequency and produces at least 104db spl sound level at 1 meter per watt. The maximum power handling capacity is 75 watts. This is more than adequate sound power for most installations.
The sectoral horns are very rugged and immune to dust and waterproof. These can be very easily cleaned with brooms or vacuum cleaners. They can withstand occasional water splash.

2. Folded Horns:

This is a cheaper alternative to the sectoral horn. Although equally rugged in construction, they are less pleasant in tonal characteristics. The power rating is 15 watts, and they produce a maximum of 115 db spl sound level at 1 meter.

3. Fireproof Speakers:

Fireproof speakers are available for applications where precaution is necessary in environment involving explosive gases.

ACEN Ceiling Speakers

ACEN Sectoral Horns with
high compression drivers

ACEN Wallmount Speakers

Accessories to ACEN Zonal Paging System PPA 15.

Slave Terminal: (SL15)

This terminal provides a facility to only initiate announcement. These do not have a power amplifier, hence no speakers can be connected to these slave stations. This terminal can be used as parallel terminal to a terminal - say an office terminal and one at the and an antechamber.

Receiver Terminal: (RS 15)

This terminal contain a handset and power amplifier. Speakers can be connected to this terminal, however there are no zone selector switches. Private channel communication is possible.

Speaker DB: (DB15)

In applications where only one master selection terminal is required and several speakers are to be connected in different zones, then this Speaker Distribution box is to be used in combination with the main terminal. Up to 15 loudspeakers can be connected from this Speaker DB. Total wattage of the speakers so connected should not exceed 120 watts. If more power is required external amplifiers are required. All the speaker output lines are usual 100 volt lines. Each speaker must be connected with a LMT of predetermined wattage.

Dual Private Channel system: (order suffix-DPC)

In the standard system only one private channel communication is possible. In the dual private channel 2 private channel switches are available so that two simultaneous private conversations are possible. The caller can announce on private channel he wants to speak with desired listener.