Acoustic Hood

A hood over the handset, so a call can be heard where a plant is at its loudest.

An acoustic hood is a shaped enclosure fitted around a telephone or paging handset in a high-noise area. It shields the user’s head and the handset from surrounding noise, so a conversation is possible where an unprotected telephone would be useless.

Makes a handset usable in noise that would otherwise defeat it
Shields both the ear and the microphone from ambient noise
Mounted with the telephone as one station

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SPECIFICATIONS

Function Noise shielding for a handset position

Fitting Around a wall or pedestal-mounted telephone

Construction Confirmed at quotation

Environment High-noise industrial areas

Note Specified with the telephone it serves

Description

There are places on a plant where a telephone is physically present and practically unusable. Next to a compressor house, a turbine hall or a running conveyor, ambient noise swamps both directions of the call: the person cannot hear the earpiece, and the microphone picks up more plant than speech. Turning the volume up does not fix it, because the noise is amplified along with everything else.

An acoustic hood addresses this physically rather than electrically. It is a shaped enclosure, mounted around the handset position, that the user leans into. Its walls and lining block and absorb noise arriving from the sides and behind, creating a quieter volume around the head. The improvement is felt in both directions - the earpiece becomes audible because less noise reaches the ear, and the far end hears speech instead of plant because less noise reaches the microphone.

Hoods are normally specified together with the telephone they serve, since the two share a mounting and have to suit the same environment. The practical considerations are the ones you would expect of anything mounted on a plant: it has to be robust enough for industrial use, its material has to survive the atmosphere it is in, and it has to be usable by someone wearing gloves, a helmet and hearing protection. Where the position falls inside a classified area, the telephone and any associated equipment have to be certified for that zone, which is a question about the telephone rather than the hood.

Note that a hood does not replace hearing protection or a properly designed PAGA scheme. It solves one specific problem - two-way conversation at a fixed point in a loud place - and it solves it well. Broadcast announcements in the same area remain a matter of loudspeaker coverage and intelligibility.

Features

Two-way improvement. Shields the ear so the handset can be heard, and the microphone so speech reaches the far end.
Physical, not electronic. Reduces the noise arriving at the user rather than amplifying speech over it.
Fixed-point solution. Makes a defined telephone position usable in an area that would otherwise need someone to walk away to take a call.
Industrial construction. Built for plant duty and for users in gloves, helmets and hearing protection.
Specified with the telephone. Mounting, material and position treated as one station rather than two purchases.

Applications

Hoods go where the noise floor makes an ordinary telephone position pointless.

Compressor and pump houses. Continuous high noise at a fixed location.
Turbine and generator halls. Power generation plant rooms.
Engine rooms and machinery spaces. On vessels and offshore structures.
Process areas and conveyors. Where operators need to call the control room from where they are working.
Workshops and fabrication bays. Grinding, cutting and impact noise.
Loading and drilling areas. Outdoor positions with sustained equipment noise.

Tell us the position and the measured or expected noise level and we will specify the telephone, the hood and the mounting together.

Support & Documents

PT Vivo Asia Teknologi Indonesia designs and commissions public address and general alarm systems rather than simply supplying the parts. Our scope typically covers:

Acoustic coverage study against your layout and measured background noise levels.
Loudspeaker selection, placement, tapping and zone design.
Amplifier, controller and cabling design, including line monitoring where required.
Supply, installation, termination and commissioning.
Intelligibility testing and sign-off against the applicable standard.
Integration with fire and gas detection, ESD and telephone systems.
Operator training, spares provisioning and ongoing maintenance.

Ratings, approvals and acoustic figures vary by model and are confirmed against the current manufacturer datasheet at quotation stage. Tell us the areas to be covered, the hazardous-area classification and the noise levels you are working against, and we will come back with a coverage design and a full bill of materials.

Use the enquiry button above for a datasheet, a specification or a project quotation.