Comfort audio Programmer DT20 User manual

User manual
North America
English
Comfort Digisystem
Micro Receiver DT20

Micro Receiver DT20 2
User manual
Table of contents Page
1) Regulatory information 3
2) Introduction Comfort Digisystem 4
3) Overview - Micro Receiver DT20 4
4) Check the hearing instruments input 4
5) Getting started 5
6) Acoustic indication, sound signals 5
7) Modes in the Micro Receiver DT20 6
8) Output for user with different input types and 6
programs in the hearing instrument
9) Pairing 8
10) Trouble shooting 9
11) Technical data 9
12) Service and warranty 10
13) Radio range and channels 10
14) Important safety instructions 11

Micro Receiver DT20 3
1) Regulatory information
Comfort Digisystem products are not to be used as a substi-
tute to the hearing aids and should be used in accordance
with the specifications and recommendations provided by
your physician.
NOTE! Max output > 130 dB SPL (Sound Pressure Level).
Could be very dangerous for your hearing.
It is recommended that customers keep the volume control
in the lowest position, when turning on the device. If not, the
sound could potentially cause harm to the customers’ hear-
ing.
Comfort Audio is not liable for damages arising from usage
of the equipment not in accordance with the instructions pro-
vided by Comfort Audio. Comfort Audio shall not be liable for
performance problems and/or damages caused in any way
by customer’s modification of any part of the equipment.
Federal Communications Commission Statement, This device
complies with part 15 of the FCC Rules. Operation is subject to
the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including
interference that may cause undesired operation.
Programmer DT20 - IC: CAN RSS-Gen/CNR-Gen
Industry Canada,
This device complies with Industry Canada licence-exempt
RSS standard(s). Operation is subject to the following two
conditions:
(1) this device may not cause interference, and
(2) this device must accept any interference, including inter-
ference that may cause undesired operation of the device.
Le présent appareil est conforme aux CNR d’Industrie
Canada applicables aux appareils radio exempts de licence.
L’exploitation est autorisée aux deux conditions suivantes :
(1) l’appareil ne doit pas produire de brouillage, et
(2) l’utilisateur de l’appareil doit accepter tout brouillage
radioélectrique subi, même si le brouillage est susceptible
d’en compromettre le fonctionnement.
Model: Programmer DT20
IC: CAN RSS-Gen/CNR-Gen
Model: Micro Receiver DT20
IC: CAN RSS-Gen/CNR-Gen
WARNING!
Changes or modifications not expressly approved by the party
responsible for compliance could void the user’s authority to
operate the equipment.
NOTE:
This equipment has been tested and found to comply with the
limits for a Class B digital device, pursuant to Part 15 of the
FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential instal-
lation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance
with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interfer-
ence will not occur in a particular installation. If this equip-
ment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment
off and on, the user is encouraged to try to correct the inter-
ference by one or more of the following measures:
-- Reorient or relocate the receiving antenna.
-- Increase the separation between the equipment and
receiver.
-- Connect the equipment into an outlet on a circuit
different from that to which the receiver is connected.
-- Consult the dealer or an experienced radio/TV technician
for help.
DANGER!
DO NOT USE the COMFORT DIGISYSTEM products if
you have a PACEMAKER or other implanted device.
The Comfort Digisystem products could cause the
pacemaker or other implanted device to malfunction
and cause serious injury or death.

Micro Receiver DT20 4
3) 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.
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 au-
dio 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 instrument 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 individually 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).
4) Check the hearing instruments input
2) 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 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 0,04 oz (1,1 g) and is powered by the hearing
instrument’s battery. To minimize energy consumption, the mini receiver is equipped with an optional auto-sleep fea-
ture.
Together with existing microphones and receivers in the Comfort Digisystem assortment, the Micro Receiver DT20
provides clear speech perception. The Micro Receiver DT20 is the world’s first digital mini receiver, taking full
advantage of digital technology in enabling outstanding sound reproduction.
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.
Europlug
DT20

Micro Receiver DT20 5
5) Getting started
Connect the Micro Receiver DT20 to the audio shoe on
the hearing instrument. Check that the audio shoe is
connected to the hearing instrument according 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.
Briefly press the push-button on the Micro Receiver
DT20 to turn it on or off.
(If the Micro Receiver DT20 has been programmed to
the mode Always on, it will start automatically when it’s
connected to the hearing instrument. The on/off func-
tion of the push-button is then disabled.)
6) 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 dif-
ferent tone lengths.
Action: Sound signal: Indicate this:
Button pressed briefly Short high pitch •  Selecting mode or turning on
Button pressed briefly Short high pitch x 2 ••—Turning off
+ long low pitch
Button pressed 2 sec. Short low pitch •
•Pairing mode
+ short high pitch
Pairing Short high pitch x 2 •• Successful pairing
Pairing Long high pitch —— Pairing failed
+ long low pitch
2b. If the hearing instrument is equipped with a DAI
input (check with audiologist or hearing instrument
manufacturer), no programming of the hearing instru-
ment is necessary. The Micro Receiver DT20 works with
the Microphone (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).
Europlug
DT20

Micro Receiver DT20 6
7) 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 Receiv-
er 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.
Hearing instrument:
Micro Receiver DT20 push-button
Off R mode
DAI input Off Radio only
Programmable DAI input
(DPAI)
DAI + M program Off Radio + HI microphone
Programmable DAI input
(DPAI)
DAI program only Off Radio only
Micro Receiver DT20 with R mode enabled (default setting)
The chart below shows the output (what the user can hear) when Micro Receiver 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:
8) 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 7
Hearing instrument:
Micro Receiver DT20 push-button
Off R+M mode
DAI input Off Radio + HI microphone
Programmable DAI input
(DPAI)
DAI + M program Off Radio + HI microphone
Programmable DAI input
(DPAI)
DAI program only Off Radio only
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:
Micro Receiver DT20 with both R and R+M modes enabled
The chart below shows the output (what the user can hear) when Micro Receiver 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
(DPAI)
DAI + M program Off Radio +
HI microphone * Radio + HI microphone *
Programmable DAI input
(DPAI)
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 ena-
bled 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 difference 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.

Micro Receiver DT20 8
Example 1: Pairing a Micro Receiver DT20 into an exist-
ing Comfort Digisystem consisting of one Conference
Microphone DC10 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-button for 2 seconds.
Acoustic indication: ••
3. Start the Conference Microphone DC10.
4. Rapidly press the pairing button on the DC10 twice.
The display on the DC10 responds with the text
“Info sent”.
5. The Micro Receiver DT20 confirms success-
ful pairing with an acoustic indication: ••
Example 2: Make a new eavesdrop secure configu-
ration with one Microphone DM10 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 DM10 and open the menu.
Select Communication/Pairing/New code key and
answer Yes if you want to create a new code key and
transmit it.
4. The Micro Receiver DT20s confirm success-
ful pairing with an acoustic indication: ••
Example 3: Make a new eavesdrop secure configura-
tion with one Microphone DM10 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 head
phones 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 DM10 and open the menu.
Select Communication/Pairing/New code key and
answer Yes if you want to create a new code key and
transmit it.
5. The Micro Receiver DT20 confirms success-
ful 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 DM10 and select
Communication/Pairing/Send info .
9. The Micro Receiver DT20 confirms success-
ful pairing with an acoustic indication: ••
9) 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.

Micro Receiver DT20 9
11) Technical data Micro Receiver DT20
Radio transmission: SST - SecureStream
Technology
Frequency range: 904 - 927 MHz
Range: Approx. 100 feet (30 m)
Dimensions: 0.38 x 0.44 x 0.84 inches
(9.7 x 11.2 x 21.3 mm)
Weight: 0.05 oz (1.1 g)
The weights, dimensions, capacities, performance ratings and other data in
Comfort Audio’s brochures, prospectus, circulars, advertisements, price lists and
instructions sheets are mentioned only as general information. They are only ap-
proximate and shall not bind Comfort Audio.
10) 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 con-
nected 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 100 feet
(30 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.
If Auto sleep is enabled, the Micro Receiver DT20 goes
into sleep mode if there is no radio signal. But if another
radio signal (with the same frequency you are using)
is present, the Micro Receiver DT20 might start again
automatically. This could cause a loud hissing noise and
that’s why Auto sleep should be used with caution.

Micro Receiver DT20 10
12) Service and warranty
Warranty extension
Comfort Audio Inc. warrants this product sold to the
first end user (buyer) against defects in materials or
workmanship for the time period and as set forth below.
Pursuant to this Limited Warranty, Comfort Audio will,
at its own option, either (a) repair the product or the
parts determined to be defective, using new or refurbis-
hed parts, or (b) provide you with a new, or at our
option, a refurbished unit. The repaired or exchanged
unit is under warranty for the remainder of the original
product’s warranty period. The warranty does not in-
clude any other direct, indirect or consequential damage
or loss, or any third party damages or losses.
This Limited Warranty is for a period of two years from
the date of purchase as indicated by an original receipt
from a Comfort Audio authorized retailer, dispenser or
medical facility. For accessories the warranty period is
90 days as of the date of delivery.
How to make a warranty claim
For warranty service, you must contact the Comfort
Audio Customer Service listed below to obtain an
RMA (Return Merchandise Authorization) number.
A description of the defect, your name, address and
telephone number is required.
Ship the product freight prepaid via UPS or its equiva-
lent, including a copy of the original purchase receipt,
any cables, earphones and base/charger unit, in its
original packaging or one that offers equal protection.
Insure your shipment for loss or damage. Comfort Audio
accepts no liability in case of damage or loss en route to
our offices.
This Limited Warranty does not cover
Damage from misuse, neglect or normal wear and tear.
Products that have been modified. Products purchased
or serviced outside the territory. If you purchased your
product outside the territory, see your retailer for war-
ranty information.
Product Registration
Please complete, sign and mail the Product Registra-
tion Card packed with your unit. It will make it easier to
contact you if it ever would be necessary.
Comfort Audio Inc.
411 E. Business Center Drive, Suite 109
Mount Prospect, IL 60056, USA
To contact the Comfort Audio Customer Service,
call [phone]
or by e-mail [e-mail]
13) Radio range and channels
The transmitter and receiver have built-in antennas. The
radio range between the units varies depending on the
product and the particular environment you are in.
Like all radio systems, Comfort Digisystem communi-
cates on specific channels. If you use two transmitters
on the same channel or a neighbouring one, there may
be interference. Other electronic equipment can also
interfere with radio transmissions.
The channel that you use in your country is perhaps not
permitted abroad. Always get in touch with your hearing
aid provider in your country in order to find out which
channels are permitted in different countries.
Comfort Audio is not liable for unauthorized use of radio
waves, such as, but not limited to: interferences with
police communication, or strategic communication,
military installations etc.

Micro Receiver DT20 11
Subject to change
14) Important safety instructions -
Read these 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
arounding-type plug. A polarized plug has two blades
with one wider than the other. A grounding type plug has
two blades and a third grounding prong.
The wide blade or the third prong are provided for your
safety. If the provided plug does not fit into your outlet
consult an electrician for replacement of the obsolete
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 power-supply cord or
plug is damaged Iiquid has been spilled or objects
have fallen into the apparatus, the apparatus has
been exposed to rain or moisture does not operate
normally or has been dropped.
13) Start listening at a low volume.
14) Too high a volume can seriously damage your
hearing.
15) Don’t disassemble 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 nonper-
mitted frequency. Check with the frequency authority 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 incor-
rectly replaced.
23) The product shall not be exposed to excessive heat
such as sunshine, fire or the like.
24) Products include radio transmitters. Do not use
products where it is not allowed to use electronic
equipment, e.g. 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.
27) Do not leave the product unloaded for too long, the
battery could get damaged.
28) Do not keep the product connected to the charger if
it is not used for a longer period.

Manufactured by:
Comfort Audio AB
Comfort Audio AB, Box154, SE-301 05 Halmstad, Sweden
Tel. [phone] Fax [phone]
Local US office:
Comfort Audio Inc, 411 E. Business Center Drive, Suite 109
Mount Prospect, IL 60056, USA
T [phone]
[e-mail] www.comfortaudio.us
MA0466 1304