Comfort Digisystem DT20 User manual

English
User manual
English
Comfort Digisystem
Micro Receiver DT20

2
Micro Receiver DT20
User Manual
Table of Contents Page
Introduction Comfort Digisystem 3
Presentation of the Micro Receiver DT20 3
Overview - Micro Receiver DT20 4
Check the hearing instrument’s input 5
Getting started 7
Acoustic indication, sound signals 8
Modes in the Micro Receiver DT20 8
Output for user with different input types and 9
programs in the hearing instrument
Pairing 12
Trouble shooting 14
Service and warranty 15
Technical data 15
Important safety instructions 16

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Micro Receiver DT20
Introduction to the Comfort Digisystem
Thank you for choosing Comfort Digisystem. Our products are easy to use and
give you crystal clear sound.
Before using the product, please read this manual carefully.
The Comfort Digisystem products feature SecureStream Technology – a
unique, patented digital technology allowing eavesdrop-secure radio transfer
in real time.
Comfort Digisystem Micro Receiver DT20
— the world’s smallest digital mini receiver
The Comfort Digisystem Micro Receiver DT20 is a digital mini receiver that
you
can easily connect to any hearing aid with a standard three-pin Europlug
audio shoe.
The receiver weighs 1,1 gram and is powered by the hearing instrument’s
battery. To minimize energy consumption, the mini receiver is equipped with
an optional auto-sleep feature.
Together with existing microphones and receivers in the Comfort Digisystem
assortment, the Micro Receiver DT20 provides clear speech perception.
The optional professional tool Programmer DT20 can be used to configure the
Micro Receiver DT20.
The Programmer DT20 also makes it easy to test the Micro Receiver DT20
with or without a hearing instrument.

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Micro Receiver DT20
Overview - Micro Receiver DT20
Push-button
For toggling between
different listening
modes and activating
pairing mode.
Europlug
For connecting to the
audio shoe on a hearing
instrument or to
the socket on the
Programmer DT20.

5
Micro Receiver DT20
Check the hearing instrument’s input
To be able to use the Micro Receiver DT20, check if — and how — the hearing
instrument supports the use of a mini receiver:
1. The hearing instrument must be equipped with an audio shoe with a
powered Europlug socket made for mini receiver use. This connects the
Micro Receiver DT20 to the hearing instrument and also supplies the DT20
with power from the hearing instrument’s battery. The received audio signal
will then be transferred from the Micro Receiver DT20 to the hearing instru-
ment through the audio shoe.
2a. If the hearing instrument is equipped with a Programmable DAI input
(DPAI), programming of the hearing instrument might be necessary (check
with audiologist or hearing instrument manufacturer). In this case the push-
button on the Micro Receiver DT20 cannot switch between the R and R+M
modes. This is instead done by using different listening programs in the hear-
ing instrument.
TIP! The volume of the Micro Receiver DT20’s R and R+M mode can be set individu-
ally by using the Programmer DT20.
This makes it possible to use the push-button as a simple volume control in
combination with a hearing instrument with Programmable DAI input (DPAI).
EuroplugDT20

6
Micro Receiver DT20
2b. If the hearing instrument is equipped with a DAI input (check with
audiologist or hearing instrument manufacturer), no programming of the
hearing instrument is necessary. The Micro Receiver DT20 works with the Mi-
crophone (M) listening program on your hearing instrument. By setting up the
Micro Receiver DT20 with the Programmer DT20, the push-button on the
Micro Receiver DT20 can be used to select the listening mode: Radio only (R
mode) or Radio + Hearing instrument microphone (R+M mode).
EuroplugDT20

7
Micro Receiver DT20
Getting started
Connect the Micro Receiver DT20 to the audio shoe on the hearing instru-
ment. Check that the audio shoe is connected to the hearing instrument ac-
cording to the manufacturer’s instructions.
Make sure that the Micro Receiver DT20 is fitted in the correct manner and
push the Euro-plug completely into the socket of the audio shoe.
The Micro Receiver DT20 is powered by the hearing instrument’s battery.
Make sure that the battery is fresh. If you are unsure, replace the battery.
The Micro Receiver DT20 will start automatically when it’s connected to the
hearing instrument. Briefly press the push-button on the Micro Receiver DT20
to turn it on or off again.
OK!
NOT OK!

8
Micro Receiver DT20
Acoustic indication, sound signals
The following is a description of the acoustic indications (sound signals). The
sound signals consist of various combinations of two different tones: one high
pitch tone (1000 Hz) and one low pitch tone (500 Hz), and two different tone
lengths.
Action: Sound signal: Indicate this:
Button pressed Short high pitch • Selecting mode
briefly or turning on
Button pressed Short high pitch x 2 ••—Turning off
briefly + long low pitch
Button pressed Short low pitch ••Pairing mode
2 sec. + short high pitch
Pairing Short high pitch x 2 •• Successful pairing
Pairing Long high pitch —— Pairing failed
+ long low pitch
Listening modes in the Micro Receiver DT20
The available listening modes in the Micro Receiver DT20 can be setup in
different configurations:
RDefault setting
R+M Setup with Programmer DT20 is necessary
Rand R+M Setup with Programmer DT20 is necessary
The Programmer DT20 is used to configure and enable or disable different
listening modes in the Micro Receiver DT20. The push-button on the Micro
Receiver DT20 is used to toggle between the activated listening modes.
It is also possible to disable the push-button completely.

9
Micro Receiver DT20
Output for user with different input types and programs in the
hearing instrument
Different hearing instrument electrical input types and available programs in
the hearing instrument will result in different output for the user. Output for
the user is shown in the white sections of the charts below.
Micro Receiver DT20 with R mode enabled (default setting)
The chart below shows the output (what the user can hear) when Micro Re-
ceiver DT20 listening mode R is enabled in combination with different input
types and programs in the HI.
When pressing the push button on the Micro Receiver DT20, the listening
mode is shifted in the following sequence:
Hearing instrument:
Micro Receiver DT20 push-button
Off R mode
DAI input Off Radio only
Programmable DAI input
DAI + M program Off Radio + HI microphone
Programmable DAI input
DAI program only Off Radio only

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Micro Receiver DT20
Micro Receiver DT20 with R+M mode enabled and R mode disabled
The chart below shows the output (what the user can hear) when Micro
Receiver DT20 listening mode R+M is enabled, in combination with different
input types and programs in the HI.
When pressing the push-button on the Micro Receiver DT20, the listening
mode is shifted in the following sequence:
Hearing instrument:
Micro Receiver DT20 push-button
Off R+M mode
DAI input Off Radio + HI microphone
Programmable DAI input
DAI + M program Off Radio + HI microphone
Programmable DAI input
DAI program only Off Radio only

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Micro Receiver DT20
Micro Receiver DT20 with both R and R+M modes enabled
The chart below shows the output (what the user can hear) when Micro Re-
ceiver DT20 listening modes R and R+M both are enabled, in combination with
different input types and programs in the HI.
When pressing the push-button on the Micro Receiver DT20, the listening
mode is shifted in the following sequence:
Hearing instrument:
Micro Receiver DT20 push-button
Off R mode R+M mode
DAI input Off Radio only Radio +
HI microphone
Programmable DAI
input
DAI + M program Off Radio +
HI microphone * Radio + HI microphone *
Programmable DAI
input
DAI program only Off Radio only * Radio only *
* When using this setup in combination with Programmable DAI input (DPAI), the level of the two
modes (R+M and R) can be programmed individually to serve as a volume control.
Note! Difference in volume can occur
When using a hearing aid with Programmable DAI input (DPAI) and having both R
and R+M modes in the Micro Receiver DT20 enabled there can be a difference in
volume between the R and R+M modes even if the Micro Receiver DT20 has been
programmed with identical output levels for the two modes. The reason for this dif-
ference is that the output level in the Micro Receiver DT20 is affected by the input
impedance of the hearing instrument.
The difference in output level can vary between different hearing instruments -
usually the output level will be slightly higher in the R+M mode. An adjustment
might be done with the Programmer DT20 in order to meet the users requirements.

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Micro Receiver DT20
Pairing
The Micro Receiver DT20 can receive but not transmit pairing information. To
pair the Micro Receiver DT20 with your Comfort Digisystem transmitter the
Micro Receiver DT20 must be connected either to your hearing instrument or
to the Programmer DT20.
Press the push-button on the Micro Receiver DT20 for 2 seconds to activate
pairing mode.
When pairing mode is activated, you receive an acoustic indication: • •
Send the pairing information within 15 seconds.
To interrupt pairing mode, briefly press the push-button.
Example 1: Pairing a Micro Receiver DT20 into an existing Comfort Digisys-
tem consisting of one Conference Microphone DC20 and one Receiver DH10:
1. Connect the Micro Receiver DT20 to the hearing instrument’s audio
shoe according to the instructions.
2. Initiate pairing mode in the DT20 by pressing
the push-buttons for 2 seconds. Acoustic indication: ••
3. Start the Conference Microphone DC20.
4. Rapidly press the pairing button on the DC20 twice. The display on the
DC20 responds with the text Sending info.
5. The Micro Receiver DT20 confirms successful
pairing with an acoustic indication: ••
Example 2: Make a new eavesdrop secure configuration with one Micro-
phone DM90 and two hearing instruments with Micro Receiver DT20s:
1. Connect the Micro Receiver DT20s to the hearing instrument’s audio
shoes according to the instructions.
2. Activate pairing mode in the two DT20’s by pressing
the push-buttons for 2 seconds. Acoustic indication: • •
3. Start the Microphone DM90 and open the menu. Select Communication/
Pairing/New code key and answer Yes to the question of whether you
want to create a new code key and transmit it.
4. The Micro Receiver DT20s confirm successful
pairing with an acoustic indication: ••

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Micro Receiver DT20
Example 3: Make a new eavesdrop secure configuration with one Micro-
phone DM90 and two Micro Receiver DT20s using the Programmer DT20:
1. Put one of the Micro Receiver DT20s into the Programmer DT20.
2. Start the Programmer DT20 and connect headphones or a neck loop to
be able to listen.
3. Activate pairing mode for the DT20 by pressing the push-button for
2 seconds.
In the headphones/neckloop you receive an acoustic indication: ••
4. Start the Microphone DM90 and open the menu. Select Communication/
Pairing/New code key and answer Yes to the question of whether you
want to create a new code key and transmit it.
5. The Micro Receiver DT20 confirms
successful pairing with an acoustic indication: ••
6. Remove the paired DT20 and connect the other DT20
into the Programmer DT20.
7. Activate pairing mode on the DT20 by pressing the push-button for
2 seconds.
In the headphones/neckloop you receive an acoustic indication: ••
8. Open the menu on the DM90 and select Communication/Pairing/Send
info .
9. The Micro Receiver DT20 confirms successful
pairing with an acoustic indication: ••

14
Micro Receiver DT20
Trouble shooting
The receiver does not start
1. Check that the correct listening program is selected on the hearing
instrument.
2. Make sure the Micro Receiver DT20 is correctly connected to the hearing
instrument’s audio shoe. Also check the connection between the audio
shoe and the hearing instrument.
3. Make sure all connecting surfaces are clean.
4. Check/replace the hearing instrument’s battery.
5. Remember to press the push-button briefly to switch the DT20 on.
Poor speech intelligibility
The distance between the transmitter and the receiver may be too long. The
range is around 25 meters.
The distance between the microphone and the talking person may also be too
long; move the microphone closer to the talking person.
Try changing the channel/environment.
Poor range and interference
In some environments, such as in buildings with a lot of concrete, iron or
sheer metal structures, the range may be reduced.
There may also be electronic equipment nearby causing interference. Change
the channel.
No sound
Check that the transmitter and the receiver are set to the same channel.
Loud hissing noise
Check that the Comfort Digisystem units you are using are paired together.

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Micro Receiver DT20
Service and warranty
Comfort Audio AB accords a limited warranty for two years as of the date of
delivery. This covers all defects of manufacture and materials. For accessori-
es the warranty period is 90 days as of the date of delivery. Local agreements
or regulations may exist.
Defects caused by careless handling or intervention inside the product or its
accessories are not covered by the warranty.
Technical data
Radio transmission: SST - SecureStream Technology
Frequency range: F1 operates in 850-872 MHz
Range: Approx. 25 m
Dimensions: 12,55 x 9,1 x 8,45 mm
Weight: 1,1 g
!

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Micro Receiver DT20
Important safety instructions —
read before using your product
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) FolIow all instructions.
5) Do not use this apparatus near water.
6) Clean only with dry cloth.
7) Do not use near any heat sources such as radiators heat registers stoves,
or other apparatus (including amplifiers) that produce heat.
8) Do not defeat the safety purpose of the polarized or grounding plug. A
polarized plug has two blades with one wider than the other. A grounding
plug has two blades and a third grounding prong. The wide blade or the
third prong is provided for your safety. If the provided plug does not fit
your electrical outlet, consult an electrician for replacement of the
incorrect outlet — (only when using polarized plug).
9) Protect the power cord from being walked on or pinched particularly at
plugs convenience receptacles. and the point where they exit from the
apparatus.
10) Only use attachments/accessories specified by Comfort Audio AB.
11) Unplug this apparatus during Iightning storms or when unused for long
periods of time.
12) Refer all servicing to qualified service personnel. Servicing is required
when the apparatus has been damaged in any way (such as if a Iiquid has
been spilled on the apparatus, the apparatus has been subject to impact
by another object or dropped or the apparatus has been exposed to rain
or moisture) or does not operate normally.
13) Start listening at a low volume.

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Micro Receiver DT20
14) Too high a volume can seriously damage your hearing.
15) Don’t dissasemble the product.
16) Should the product break open because of damage, service should only
be done by qualified service personnel.
17) Never use a transmitter or receiver set to a non-permitted frequency.
Check with the frequency regulatory agency in the country where the
equipment is to be used.
18) The product contains sensitive electronic equipment and must be handled
carefully.
19) Never charge product in closed, unaired spaces such as handbags, cases
or other closed storage bags.
20) Only use batteries and power supply specified by Comfort Audio AB.
21) You must not change the battery yourself; please contact your point of
purchase.
22) CAUTION! Danger of explosion if battery is incorrectly replaced.
23) The product must not be exposed to excessive heat such as sunshine,
open flames or the like.
24) Products include radio transmitters. Do not use products where the use
of electronic equipment is not permitted, such as on airplanes.
25) The necklace should not be used if there is a risk of getting stuck, e.g. in
a machine or other objects.
26) Keep small parts out of reach of children and animals. Choking hazard if
swallowed.
26) Do not leave the product unloaded for too long, the battery could get
damaged.
27) Do not keep the product connected to the charger if it is not used for a
longer period.
Subject to change

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Micro Receiver DT20

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Micro Receiver DT20

Comfort Audio AB
Box154, SE-301 05 Halmstad, Sweden
Tfn [phone] Fax [phone]
[e-mail] www.comfortaudio.com
MA0460
1303
© Comfort Audio AB. All rights reserved. All content is subject to change without notice.