ELACIN DuoCom

           

In a large number of industries people are busy improving the efficiency, quality and safety at work. Mobile communication often plays a very important part in this.
In those areas in which much noise is present and the wearing of ear protectors is obligatory, communication, due to the noise and ear protectors, is seriously disturbed. This results in the fact that the call is not heard, people misunderstand each other, irritation arises and messages are misinterpreted – with al its consequences.

Now it is possible to take in the sound of the voice through the ear by electronic means. GROENEVELD Elcea has integrated this principle in its existing ear protectors. A special transducer has been developed for this, which can both serve as telephone (loudspeaker) and microphone. This transducer is so small that this can be build-in inside the ear protectors "in the ear" as it were.

HOW DOES IT WORK

The ELACIN DuoCom is worn in one ear. A cable is carried behind the ear, hardly noticeable, and is less vulnerable because of this. By the acoustic closed circuit between transducer and the auditory duct (ear drum) the noise is shut off. Both the information to be received and the to be transmitted are free from environmental noise because of this.

The walkie-talkie can remain attached ‘to the belt’ during a call. Responding to a call is done by a Push-To-Talk button, which may be attached to one’s clothes elsewhere, within easy reach. The other ear is provided with an ear-piece in which an acoustic filter is placed, fine tuned to the environmental noise. Through this ear the communication with the immediate environment is secured.

Advantages

	The call is heard much faster
	The call can be understood better
	There is no need to shout
	Minimal disturbance of the activities by responding quicker (there are situations in which this advantages can be life-saving, such as with the fire-brigade, bomb squad, etc)
	Minimal hindrance when wearing the device
	Communication with the immediate environment remains intact

COMPONENTS

ELACIN DuoCom

Made to measure ear protector (for left or right ear) provided with a two-way communication, made out of black FlexFit silicone.

The DuoCom consist of:

	A two-way transducer
	Acoustic filter (standard ML01-filter)
	Handle
	900 mm cable for connection to Push-To-Talk button

Push-To-Talk button

The PTT button serves to switch the communication from receiving to transmitting.
It has been provided with,

	Connector for connecting to DuoCom
	Electronics for reinforcement of the (transmitting) signal of the DuoCom to the radio system
	cable with connector to the radio system

Optional

A 3-position switch to adjust the transmitting signal

The electronics and the connector of the PTT button should be fine-tuned to the radio system to be used.
(The PTT button is a Ceotronics product)

Radio system

The DuoCom with the PTT button is compatible with most industrial radio systems.

Working

The ELACIN DuoCom is only destined for one ear. Dependent on the noise level and local legislation an extra ear protector is necessary to protect the other ear.
Messages which normally speaking are received by means of the speaker of the radio system, are now received directly in the ear. Since the ear protector muffles the environment sound, the volume can be set at a lower level than normal. This results to less distortion, which leads to an improvement of the speech audibility.
 In order to respond to a message you only have to push the PTT button when talking.

When the PTT button is pushed:

	The two-way transducer in the ELACIN DuoCom is activated
	The voice sound is caught via the eardrum by the ELACIN DuoCom
	The signal is reinforced by the electronics of the PTT button and carried to the radio system
	The microphone in the radio system is then switched off.

ELACIN DuoCom works great with one-way radios/walkie-talkies.

Application

In the frame of ear protection the above-mentioned muffling data should be applied. This means that (dependent of the frequency spectrum ) at a maximum allowed noise load of 80 dB, approximately ( 80+20=) dB environmental noise is acceptable.

However, for an optimal speech audibility the environmental noise should be approximately 10 dB lower.

So:
Maximum safety level approximately 100 dB(A)
Maximum communication level approximately 90 dB(A)

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