Comfort audio Microphone DM30 User manual

SecureStream
Technology
Comfort Digisystem User Manual
Microphone
DM30
English

2
Microphone DM30
User Manual
Table of contents Page
Introduction of the Comfort Digisystem 3
Presenting the Microphone DM30 3
Functions of the Microphone DM30 4
Getting Started 5
Attaching the neck loop at the
Microphone DM30 6
First Time Use 7
Menu and settings 10
More Functions 18
Radio Range and Channels 19
Attached Accessories 20
Other Original Accessories 20
Trouble Shooting 21
Service and Warranty 22
Technical Data 22
Important Safety Instructions 23

3
Microphone DM30
Introduction of the Comfort Digisystem
Thank you for choosing the Comfort Digisystem.
The products are easy to use, whether you use a hearing aid or not.
Before using the product, please read this User Manual carefully.
Using the Microphone DM30, the signal is transferred digitally,
resulting in an excellent clear sound.
Comfort Digisystem is fitted with SST SecureStream Technology – a type of
digital technology allowing eavesdrop-secure radio transfer in real time.
Presenting the Microphone DM30
The Microphone DM30 has both a transmitter and a receiver and is especially
designed for the use in schools.
The DM30 can be used as teacher or student microphone, depending on the
settings, see later in this manual.
The DM30 is equipped with a voice AGC (Automatic Gain Control) to maintain a
comfortable sound level at all times.

4
Microphone DM30
Functions - Microphone DM30
Function indicator
Pairing button
Input for accessories
Menu control
On / Off
Function button
Clips
Charging socket
Display
Microphone
Neck loop DM30
(accessory)
Volume control
Menu control

5
Microphone DM30
Getting Started
Charging
The microphone DM30 is chargeable. Charge the DM30 at least
3 hours before you use it for the first time. An empty battery is fully charged
within 3 hours.
During charging, the function indicator shows red and a lightning bolt appears
through the battery symbol in the display. Once the battery symbol is filled
with green columns and the function indicator shows green, the unit is fully
charged. The DM30 can be used during charging.
You must not change the battery yourself; please contact your point of pur-
chase.
Function indicator
Connecting a charger to the
Microphone DM30
Please note!
Only use the charger
supplied by Comfort Audio AB.

6
Microphone DM30


Attaching a neck loop to the Microphone DM30
1. Connect the contacts of the neck
loop at the top of the unit.
2. The contacts have to be pressed in
straightly and firmly. Press in the
contacts to the end. Check that the
neck loop is connected firmly.
3. Now the neck loop is in the right position.
When putting on/taking off the receiver
connected to the neck loop, be careful
that the contacts do not break off.
WARNING!
Never use the neck loop while playing
or if there is a risk to get stuck somewhere!

7
Microphone DM30
First Time Use
Portable system
Both teacher and all pupils can use the Microphone DM30.
DM30 is a microphone for closer range. It works best within approx. 30 cm.
The microphone can be attached to your clothes with its clip or worn around
the neck with the delivered necklace (2 lengths available).
Teacher microphone
The teacher’s DM30 is set into the mode Master Unit . In this mode, the
DM30 receives sound of the pupils’ DM30s; this sound is mixed with the one
received by the internal microphone and sent on to all DM30s of the pupils.
The pupils listen via induction loop (and their hearing aid in T-position) or with
headphones.
How to choose the mode Master Unit, see chapter Menu .
The function button of the Master Unit can be programmed in 5 ways (Button
modes):
- None (the microphone takes up sound and sends continuously)
- Push-to-talk (the teacher’s voice is only taken up when the button is
pressed; the sound of the pupils’ units is captured and transmitted
continuously).
- Mic. On/Off (the internal microphone is activated resp. deactivated when
the button is pressed; the sound of the pupils’ units is captured and
transmitted continuously).
- Silence button (in this setting you can shut off the microphone so that
no sound is sent when you press the function button.
- Receiver On/Off (the incoming sound of the pupils’ microphones can be
activated or deactivated; the internal microphone is active
continuously).
The DM30 can be connected to an external microphone (clip-on microphone
or boom microphone), headphones or induction loop.
The included receiver can be deactivated; then the microphone DM30 only
works as a transmitter.

8
Microphone DM30
Student microphone
The pupils’ DM30s are set into the mode Companion Unit . In this mode, the
DM30s receive sound of the teacher’s DM30; at the same time, they can send
via the teacher’s DM30 to all other units in the classroom.
When FCR is activated in all pupils’ units only one student at a time can send.
The pupils use the induction loop and set their hearing aids into
T-position; alternatively they can use headphones.
How to choose the mode Companion Unit, see chapter Menu .
The function button of the Companion Unit can be programmed in 3 ways
(Button modes):
- None (the microphone takes up sound and sends
continuously)
- Push-to-talk (the pupil’s voice is only taken up when
the button is pressed; the sound is send via the
Master Unit to all other Companion Units)
- Mic. On/Off (the internal microphone is activated
resp. deactivated when the button is pressed).

9
Microphone DM30
The complete portable system works as follows
1. The teacher has a DM30, programmed as Master Unit.
2. The pupils wear their DM30s, programmed as Companion Units.
3. The teacher’s voice is sent from his/her DM30 to all student DM30s.
4. As soon as a pupil activates his/her transmitter, his/her voice is sent to
the teacher’s DM30; there, the sound is mixed with the teacher’s voice
and sent to all pupil DM30s in the classroom.
5. If you chose the function FCR (Free Channel Request) in all students units,
a pupil’s transmitter can only be activated when the channel is free. Like
this, the student transmitters cannot disturb each other.
With this setting, all pupils in the classroom can hear the teacher as well as
all classmates without any problem.
For more functions, please continue reading this manual.

10
Microphone DM30
Menu and settings
Menu control
Three different selections can be made:
To access the menu, press the menu control, and then scrooll up and down.
Press the menu control to choose.
Scroll up
Press/select
Scroll down
Back
Communication
Channel
Pair
Mode
Master Unit
Companion unit
Sound
Loop
Socket
Internal Mic
Settings
PIN Code
Charge
Language
Name
Func. Indicator
Factory Reset
Time out TX
LBT
Key Lock
About
In the menu
On the following pages the
content will be presented as
well as how to change the
settings.

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Microphone DM30
Back (relates to both the main menu and submenus)
Here you can choose to return to the menu and to the main display.
Menu: Communication
Channel
To use a receiver and a transmitter together, they must be set to the same
channel.
The DM30 has both, a receiver and a transmitter; at delivery it is
programmed with one transmitting and one receiving channel.
The radio frequencies of the transmitter and the receiver must not be too
close to each other to avoid disturbances. It is possible to select to transmit
at a higher frequency and to receive at a lower one, or vice versa.
The groupings are as follows:
High frequencies (852 – 872 MHz)
¤ Channel 1-3
¤ Channel E1 – E5
¤ Channel B1 – B23
¤ Channel F1 – F15
Low frequencies (768 – 785 MHz)
¤ Channel A13 - A55
The Master channel is the channel the DM30 sends on when it is
programmed as Master Unit; it is also the channel the Companion Unit
receives on.
The Companion channel is the channel the DM30 receives on when it is
programmed as Master Unit; it is also the channel the Companion Unit sends
on.
The Master channel has priority; if an impossible frequency is chosen as
Companion channel (too close to the Master channel), an error message
appears in the display: Invalid channel combination. The Companion channel
is deactivated.
The frequencies (channels) which cannot be chosen as Master channel in
combination with the programmed Companion channel are shown in orange.

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Microphone DM30
If an orange marked channel is chosen, the Companion channel is
deactivated.
The frequencies (channels) which cannot be chosen as Companion channel
are shown in red. It is not possible to choose these frequencies.
Therefore it is recommended to choose the Master channel first:
1. Choose Communication - Channel - Master channel in the menu.
2. Choose a channel with the menu control.
3. Choose Communication - Channel – Companion channel in the menu.
4. Choose a channel with the menu control.
During pairing, both Master and Companion channel information is sent.
In the display, the chosen Master channel is shown after Mch:
The chosen Companion channel is shown after Cch:
Channels 1, 2 and 3 are free channels in most European countries and do not
require a license – see also chapter Radio Range and Channels .
FFC (Free Frequency Check) indicates in green the frequencies which are
most suitable in the specific environment.
Please note! Switch off other Digisystem transmitters for a correct result.
Pairing
To use a receiver and a transmitter together, they have to be paired, all trans-
mitters and receivers are default paired at the factory and will work together.
Please note! To prevent eavesdropping, a new code key must be generated
and transmitted between the units by pairing.
Pairing information and a new code key can be received by several activated
units at the same time.
When 2 or more DM30s are paired or if DM30s are synchronized by the
Sync DY10, the Master and Companion channel as well as the system’s
code key is sent at the same time.
1. Choose Communication – Pair
2. Choose Receive info in one unit; Ready to receive pairing information
shows in the display.
3. Choose New Code Key – Yes in the other unit.
4. Generate New Code Key and send info? shows in the display. Choose Yes.

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Microphone DM30
If the pairing was successful: the display of the unit(s) ready to receive
information shows OK.
Channel- and code key information have been sent; the transmission between
the units is now eavesdrop secure.
Add one / more unit(s) to a coded system
1. Choose Communication -> Pair
2. Choose Receive info
3. Enter the menu of an already paired Digisystem-unit
4. Choose Communication -> Pair
5. Choose Send info (-> Info sent! shows in the display)
If the pairing was successful: the display of the unit(s) ready to receive
information shows OK.
Pairing via pairing button
You can activate the pairing function via the pairing button.
1. Press pairing button 1x briefly: the Pairing function is activated
2. Press pairing button 1x long: Ready to receive pairing information is
activated
3. Press pairing button 2x briefly: Send Info – function is activated
Pairing of a receiver into the DM30 system
Receiver DH10 Choose Receive info in the menu (Communication – Pair)
or press pairing button 1x long
Receiver DE10 Press pairing button 1x long and thus activate function
Receive info
Now activate Send info function at the DM30:
1. Choose Communication - Pair
2. Choose Send info (Info sent! shows in the display)
Or: Press pairing button 2x briefly
3. Now the receiver can receive sound on the Master channel.
Pairing of Companion channel
This is necessary if you want to use another Comfort Digisystem transmitter
within the DM30 system.
1. Choose Receive info in the menu (Communication – Pair) or press pairing
button 1x long
2. Enter the menu and choose Communication – Pair – Pair Comp.Ch.
(Pair Companion channel) – Send info
3. The transmitter is now included into the DM30 system and sends on the
Companion channel.

14
Microphone DM30
Menu: Mode
Here you choose whether you want to use the unit as Master or Companion
unit: click on Master- resp. Companion Unit. After that you can program the
function button.
If the unit is programmed as Master Unit, the display shows .
If the unit is programmed as Companion Unit, the display shows .
Master Unit
Enter the menu: Mode – Button mode and choose your programming:
None: Sound is received and sent continuously.
Push to talk: The teacher’s voice is only taken up when the button
is pressed. The pupils’ voices are received and
sent continuously.
Mic. On/Off: The microphone is switched on/off when you press the
button.
Silence: In this setting you can shut off the microphone so that
no sound is sent when you press the function button.
Receiv On/Off: The included receiver (pupils’ voices coming in) is
switched on/off when the function button is pressed.
In the Master Unit you can even choose to switch off the receiver completely:
Enter the menu Mode – Receiver on, tick or tick off.
Companion Unit
Enter the menu Mode – Button mode and choose your programming:
None: Sound is received and sent continuously.
Push to talk: The microphone is only switched on when you press the
button.
Mic. On/Off: The microphone is switched on/off when you press the button.

15
Microphone DM30
FCR: Free Channel Request. This function is only shown when Push
to talk or Mic On/Off is chosen.
This function makes it impossible for several DM30s to send
at the same time on the same channel, e.g. when set to Push
to talk function.
Activate the function FCR indicator (Mode - Button mode, tick FCR indica-
tor). When the channel is occupied, the function indicator shows red and the
display shows ; if the channel is free to use, the function indicator shows
green.
In the Companion unit you can even switch off the transmitter completely:
enter the menu Mode – Transmitter on, tick or tick off.
Menu: Sound
Here you decide how you want to use the socket at the long side of the unit.
Loop
Must be activated when a neck loop is used with the DM30. If this function is
chosen, the menu control also works as volume control.
It is also possible to do further volume installations under Sound:
Max volume: Here you can install a maximum volume.
Fix volume: Here you can install a fixed volume.
Socket
Phones:
Must be activated when a neck loop is used with the DM30. If this function is
chosen, the menu control also works as volume control.
It is also possible to do further volume installations under Sound:
Max volume: Here you can install a maximum volume.
Fix volume: Here you can install a fixed volume.
External mic
Must be activated when an external microphone (e.g. a boom-microphone) is
connected to the DM30. You can even adjust the Mic gain (volume level of the
microphone).
Line in
Must be activated if an external sound source, e.g. a TV, DVD, computer etc.
should be connected to the DM30. You can even adjust the Line gain (volume
level of the sound source).

16
Microphone DM30
When Line-in is activated and as soon as a cable is connected to the DM30,
it switches automatically to continuous transmission, even if Push-to-talk
or Mic. On/Off was chosen before. Like this it is possible to use a DM30 as a
companion unit (e.g. by a second teacher) and as a multimedia connection
without having to switch modes.
Internal mic
Is used to adjust the level of the internal microphone.
Please note! The internal microphone is shut off automatically if an extern
microphone is connected.
Menu: Settings
PIN-code
Here you can activate/deactivate the PIN code function; you can even select
which functions you want to lock with a PIN.
Change PIN: Here you can create your own PIN code.
Lock select: Here you can select which part of the menu you want
to lock; you can combine all selections:
- Mode: locks all functions of the function button.
- Pair: locks all pairing functions in the unit, even the pairing button.
- Socket: locks all socket functions.
- All menus: locks all menus (except the pairing button)
- Hide PIN entry: it is only possible to unlock the menus within 3 seconds
after the unit has been started.
If you forget your PIN code, please contact you point of purchase to unlock the
unit.
Charge
Here you can activate the Auto Power Off function to shut down the unit
automatically during charging. If Auto restart is activated, the unit will start
automatically when the charger is disconnected or loses power.
Language
Here you can select the menu language.
Name
Here you can select if a text should be shown in the display (e.g. name of
pupil). Choose the symbols with the menu control. Select to save and xto
close without saving. To move the cursor during editing, use the symbols >

17
Microphone DM30
and <.
Func. Indicator (Function indicator)
Here you can choose whether the function indicator should be active or
not. This affects all functions except charging and pairing.
Factory Reset
Resets the unit to it´s original settings and erases all pairing information.
To obtain security against eavesdropping, a new code key must be
generated or received from another unit in existing coded system.
Time out TX
If this function is activated, the DM30 will stop transmitting if no sound
is registered for 1 minute. As soon as any sound is detected the trans-
mission starts again.
LBT (Listen before talk)
With this function activated the DM30 will verify that the selected channel
is free, before the transmission is started. This is done to avoid inter-
ference with any existing signals. If the selected channel is busy, the
following text will appear: “This channel is busy, select a new channel”.
Menu: Key Lock
Here you can lock all buttons. Once the key lock has been activated,
“Unlock keys?” appears in the display. Select “Yes” to unlock.
Menu: About
Here you find software information.

18
Microphone DM30
More functions
Function indicator (LED)
The function indicator shows the unit’s status depending on its setting.
On normal operation, the indicator flashes once every three seconds.
During charging the indicator shows red. When the charging is completed, the
indicator shows green. The indicator stays red even when the battery is fully
charged, if the unit is On during charge.
When the battery level gets low, the indicator slowly flashes red (check the
battery status in the display).
Once the unit has been set to receive pairing information , the indicator flash-
es green quickly.
When receiving pairing information , the indicator shows green for three sec-
onds.
When sending pairing information , the indicator flashes red five times.
When the Push to talk function or Mic On/Off is activated, the indicator shows
green when the channel is free and transmission possible. Is the channel al-
ready occupied by another microphone, the indicator shows red.
Is FCR indicator activated, the function indicator shows red when the channel
is occupied.
When using the button function Receiv On/Off (Receiver On/Off)
(Master Unit), the indicator shows red when the receiver is switched off.

19
Microphone DM30
Radio Range and Channels
The transmitter and receiver have built-in antennas. The radio range between
the units is around 30 metres. This may however vary
depending on the particular environment you are in. Like all radio
systems, Comfort Digisystem communicates on specific channels. If you use
two transmitters on the same channel or a neighboring one, there may be
interferences. Other electronic equipment can also interfere with radio trans-
missions.
In most European countries, channels 1-3 (863,250 – 864,750 MHz) may be
used for hearing products. However, you should always check with the fre-
quency assignment authority in your own country which channels are free and
which require a licence.
In addition to channels 1-3, under “Extended” there are several
channels in bands A-F which require a licence in most European
countries:
A 768 - 785 MHz
B 854 - 863 MHz
E 853 - 854 MHz
F 865 - 872 MHz

20
Microphone DM30
Attached accessories
Necklace (2 lengths available)
Charger
Colour stickers
Other Original Accessories
Induction loop
Headphones / Earphones
Clip-on microphone
Small microphone to attach to the clothes
Boom microphone
Headset microphone
Ear worn microphone
Microphone which is worn at one ear
Split cable for charging
Audio cables
Charging stand
The charging stand is connected to the provided charger. Several charging
stands can be connected and used with one charger. If you use more than
2 charging stands, a more powerful charger (A14) is necessary.
Desk stand
Desk stand for the Microphone DM30.
For other accessories, please visit our website
www.comfortaudio.com