Comfort audio DC20 User manual

1
User Manual
Conference Microphone
DC-20
English

2
User Manual
Table of Contents Page
Introduction to the Comfort Digisystem 3
Functions of the Conference Microphone DC-20 4
Functions - Charging stand 5
Functions - Telelink 6
Getting Started 7
First Time Use 8
Menu 10
More Functions 18
Radio Range and Channels 26
Attached Accessories 27
Other original Accessories 27
Trouble Shooting 28
Service and Warranty 30
Technical Data 30
Important Safety Instructions 31

3
Introduction to the Comfort Digisystem
Thank you for choosing 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 Conference Microphone DC-20 combined
transmitter and receiver, the signal is transferred digit-
ally, resulting in an excellent, interference-free sound.
Comfort Digisystem is tted with SecureStream
Technology – a type of digital technology allowing eaves-
drop-secure radio transfer in real time.
Presenting the Conference Microphone DC-20
The Conference Microphone DC-20 is an advanced micro-
phone offering the option of setting the size and shape of
the sound registering area. It can be wirelessly connected
to two telephones via Bluetooth (mobile/portable, etc.)
as well as to a landline using the original Telelink acces-
sories. The DC-20 is also equipped with a built-in receiver
which allows you to build a system of several cordless
microphones from the Digisystem series.
PSE (Perceptual Speech Enhancement)
The Conference Microphone DC-20 is equipped with
high-power sound processing that is used in the two omni
modes (omnidirectional). The method is based on empha-
sising meaningful parts of speech. Please visit our web-
site for more information on how this technology works.
SecureS t ream
Technology

4
Functions of the Conference Microphone DC-20
On / Off Function indicator
Mode selector
OFF button for built-in
microphones
OFF button for built-in
receiver
Answering button
for Bluetooth
Pairing button
Menu control/
volume control for Bluetooth
Charging socket Mic/line in
Multifunction socket

5
Functions - Charging stand
USB-socket
(for service)
Multifunction
socket
Charging
socket
Mic in
Line in

6
Functions - Telelink
USB-socket
(for service)
Multifunction
socket
Charging
socket
Mic/Line in
Telelink
connection
Standby indicator
(green)
Telephone mode
indicator (blue)
Standby/telephone button
Function selector for
Mic/Line input

7
Getting Started
Charging
The Conference Microphone DC-20 is chargeable. Charge
the DC-20 at least ve hours before you use it for the rst
time. An empty battery is fully charged within ve 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 lled with green col-
umns, the unit is fully charged and switches to automatic
oat charging.
A fully charged battery has an operating time of up to
eight hours. Battery lifetime is up to ve years. You must
not change the battery yourself; please contact your point
of purchase.
Please note:
Only use the charger
supplied by Comfort Audio AB.
Connecting a charger to the
Conference Microphone DC-20

8
First Time Use
Switch on the transmitter by pressing the On/Off button
for around two seconds.
The Conference Microphone DC-20 always starts in Omni
Mode Wide as default. The position is easily changed us-
ing the mode selector on the long side of the unit.
The various sound reception positions are located in the
following order:
- Zoom
- Omni – Narrow
- Omni – Wide
(default position)
- Music

9
OFF button for built-in microphones
This button can be used to switch off the built-in micro-
phones. An indicator is shown on the display.
OFF button for built-in receiver
Used to switch off the built-in receiver. See the “Built-in
receiver” section. An indicator is shown on the display.
Please note: The receiver level on the built-in receiver
is set to 0 (zero) on delivery. See the “Built-in receiver”
section.
Other functions are explained later in this manual.

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Menu
Menu control
Three different selections can be made:
To access the menu, press the menu control:
Back
Communication
Channel
Pairing
Bluetooth
Sound
reble and Bass
Equalizer
Advanced settings
Anslutningar
Mic/Line in
Charger unit
Telelink
Receiver gain
Settings
Auto power off
Language
Key lock
Name
Factory reset
Activate key lock
About
Scroll up
Press/select
Scroll down

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Back (relates to both the main menu and submenus)
Here you can choose to return to the menu and to the
main display.
Communication
Channel
To use the receiver and the transmitter together, they
must be set to the same channel. The transmitter and
receiver are set to the default channel by the manufac-
turer. (This does not apply to units with both sender and
receiver. In this case the transmitter/receiver are ad-
justed as described in chapter ”Radio range and Chan-
nels”). To change channel, select “Channel” in the menu.
Choose transmitter or receiver (this applies only to units
with both transmitter and receiver). Select a new channel
using the menu control.
Channel information is also given when the units are
paired. Channels 1, 2 and 3 are free channels in most
European countries that do not require a licence. Under
“Extended” more channels can be selected, but these
usually require a licence – see the section Radio Range
and Channels.
FFC (Free Frequency Check) indicates in green the suit-
able frequencies for the specic environment. Please
note! Switch off your other Digisystem transmitters for
correct result
FFC dB indicates the noise level in dB for each channel.
The higher the (-)value, the lower the risk of interference.
When selecting a channel for units with a built-in trans-
mitter and receiver, see the “Built-in receiver” section.
Pairing
To use a receiver and transmitter together, they must be
paired. All transmitters and receivers are default paired

12
at the factory and will work together. To prevent eaves-
dropping, a new code key must be generated and trans-
mitted between the units by pairing.
Vid felmeddelandet “Felaktig kanal. Gör ett nytt val.” se
avsnitt “Inbyggd mottagare”.
Transmitting/receiving of pairing information along with a
new code can be performed from any Comfort Digisystem
unit with a display. To pair units without a display, see sec-
tions “Pairing (via pairing button)” and “Pairing (connec-
tor)” for more information. Pairing information or a new
code key can be received by several activated units.
Comfort Digisystem units with both transmitters and
receivers built-in can be paired separately. When opening
the pairing menu, choose the concerning unit (transmit-
ter/receiver). In units with both transmitters and receiv-
ers, the pairing button controls the transmitter. The
transmitter and receiver are paired separately in these
units. The code key is always the same for the transmitter
and the receiver when these are built-in in the same unit.
The easiest way to get the same code key in the whole
Digisystem, when using units with both transmitter and
receiver built-in, is to generate a new code key from the
combined unit; in that way the built-in receiver gets the
same code as the rest of the system.
Pairing (via menu)
Select “Receive info” on one unit. “Ready to receive pair-
ing info” is shown in the display. Select “New code” on
the other unit; select Yes. “Generate new code and send
info?” is shown in the display. Select Yes (Now both the
channel and the coding information have been sent, and
sound transfer is eavesdrop-secure). To pair another unit
into your coded system, select “Send info” instead on one
of your paired units.

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Pairing (via pairing button)
(The only way of pairing units without a display, with the
pairing button)
You can activate the Pairing function via the pairing but-
ton. One brief press of the button opens the “Pairing”
menu. Two brief presses activate the “Send info” function.
One long press activates the “Receive info” function.
Pairing (Connector)
The connector cannot send information, only receive it.
To activate the position “Receive info”, the connector
must be in operation (position I or II) and connected to an
operating hearing aid. The selector is then quickly moved
to position 0 and back to the operating position (I or II).
The connector can now receive pairing info. If no info is
received by the connector, after a short time this returns
automatically to the previous setting.
Bluetooth
Here you can activate Bluetooth to be able to pair the
Conference Microphone DC-20 with a telephone or
mobile. When “Tele Only” is selected, the transmitter is
active only when the telephone call is connected via Blue-
tooth or Telelink.
Using “Mix level” you can adjust the volume of your own
voice. This function can only be adjusted during an ongo-
ing telephone call. This function can also be used to allow
communication with the surrounding environment while
making a telephone call.
“Pair Mobile” (code 1234) is used to pair a mobile with the
DC-20.
“Para Telefon” (kod 0000) används för att para fast,
trådlös (DECT) eller mobiltelefon med DC-20.
Select “Clear settings” to delete all information on paired
units. Please note: After this the Bluetooth units have to be

14
paired again (so that Bluetooth can work).
When using land line/cordless and mobile phones at the same
time: On some land line/cordless telephones the Bluetooth connec-
tion is not active if no call is being made. This can cause a time delay
before Bluetooth is connected for an incoming call. In certain cases the
time delay can be avoided by pairing a cordless telephone in the “Pair
Mobile” prole, but this can cause problems with initiating outgoing
calls from the land line/cordless telephone. For more information, see
“More Functions”.
Sound
Treble and Bass
Treble and Bass control that allows simple adjustment of
the unit’s equalizer. Press the answering button to return
to the menu.
Equalizer
You can obtain ne tuning of the sound characteristics
by changing the level at various frequencies, from low to
high frequencies. The level can be increased or reduced
at the mid-range frequencies 63 Hz, 125 Hz, 250 Hz, 500
Hz, 1 kHz, 2 kHz, 4 kHz and 8 kHz. Press the answering
button to return to the menu.
Advanced settings
Here you can adjust PSE compensation in the modes
Omni – Wide and Omni – Narrow. Settings are saved
separately for each mode.
The effect of increasing this value is that the volume will
increase when the overall sound level in the environ-
ment raises. If the surrounding sound is too high, you can
increase PSE compensation and the overall sound level is
raised.
For someone who feels that the volume gets too loud in
noisy environments, PSE compensation can be reduced.

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On delivery, Omni – Wide is set to +2 and Omni – Narrow
to +6.
Input
Mic/Line in
This is where the function for the mic/line in socket is
selected:
- Line in (for TV or computer etc.)
- Microphone in (for an external microphone, e.g. a clip-
on microphone)
- Headphones out (for testing the unit with headphones)
Here you can also adjust the level for Line in, Microphone
in and headphones:
- Line level
- Mic level
- Headphones
When connecting a signal source to Line in (e.g. a TV),
Line in mix is selected to also receive surrounding sound
through the Conference Microphone DC-10.
Charging stand
Here you can adjust the level for Line in and Microphone
in. Line in mix can also be selected for use with charging
stand.
It is not possible to use both sockets at the same time. In
this case an error-message is shown: “Disconnect from
Mic/Line”.
Telelink
If original Telelink accessories have been connected, the
following functions can be adjusted:
- Tele-in level (adjusts the incoming telephone sound
level for landline telephony; can also be adjusted using
the menu control when a call is in progress).
- Tele-out level (adjusts the outgoing sound level for
landline telephony. This control has no function when an

16
external microphone is used).
- Mic/Line in (adjusts the level of sound on the Mic/Line-
in input when the unit is in standby mode (not telephony,
green indicator on Telelink). The selection of Mic or Line
is done using the A-B-C switch on the underside of the
Telelink. For more information, see “Telelink” under
“More functions”.
In Mic mode, you may select the desired preset sound
registering mode for landline telephone calls (does not
apply when an external microphone is used for Telelink).
When “Tele Only” is selected, the transmitter is active
only when the telephone call is connected via Bluetooth
or Telelink.
Receiver level
The incoming sound level is adjusted here via the built-in
SST receiver. See “Built-in receiver” for more informa-
tion.
Settings
Auto power off
This is activated to shut down the unit automatically dur-
ing charging.
Language
Here you can select the menu language.
Key lock
When this function is activated, all buttons are locked
automatically as soon as the display fades out. It can be
quickly activated; see the section “Activate key lock”.
Name
Here the text to be displayed is selected. Choose symbols
with the menu control. Select “” to save and “x” to close
without saving. To move the cursor during editing, use the

17
symbols > and <.
Factory reset
Resets the unit to the factory settings. Also deletes all
pairing information (SST and Bluetooth). To prevent
eavesdropping a new code key must be generated.
Activate key lock
Here you can activate the key lock directly when the menu
control has been pressed. Or you can press the menu
control, followed by arrow up (mode selector) on the long
side of the unit.
About
Here you nd software information.

18
More Functions
Function indicator (LED)
The function indicator shows the unit’s mode settings.
Music position = Flashes green once every three seconds
Omni position – Wide = Flashes green twice every three
seconds
Omni position – Narrow = Flashes green three times
every three seconds
Zoom position = Flashes green four times every three
seconds. When the battery level gets low, the indicator
ashes red. (Check the battery status on the display)
During charging the indicator shows red. When the unit
is fully charged, the green indicator is lit. This function is
disengaged when the DC-20 is switched on and placed in
the Telelink.
Once the unit has been set to receive pairing information,
the indicator ashes green quickly.
When receiving pairing information, the indicator shows
green for three seconds.
When sending pairing information, the indicator ashes
red ve times.
When the pairing mode for Bluetooth has been activated,
the indicator shows blue.
When a Bluetooth telephone has been successfully con-
nected, the indicator ashes blue ve times.
During an ongoing telephone call, the indicator ashes
blue every second second.
When “Reset BT” is selected, the indicator ashes blue
ten times.

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BluetoothTM
The Conference Microphone DC-20 can be connected
to two Bluetooth telephones at the same time. During
a telephone call the DC-20 is used as a hands-free that
receives the sound and transfers it on to the call partner.
The sound from the call partner’s telephone is sent from
the DC-20 and can be received by a paired Digisystem
receiver.
When Bluetooth is activated in the menu, the Bluetooth
symbol is shown in the display. If only one telephone has
been paired (and connected) with the unit, the gure 1
appears at the Bluetooth symbol in the display. If two
telephones have been paired (and connected) the gure 2
appears instead.
Some DECT telephones are only connected during incom-
ing or outgoing calls. In such cases, the unit can also
display a 1, even if a mobile and a DECT telephone have
been paired with the unit.
The DC-20 automatically recognises the type of connec-
tion to be used when units are paired (headset/hands
free).
Application - BluetoothTM
Answer an incoming call:
Press the answering button briey (around 1/2 second),
or answer with the telephone.
End a call:
Press the answering button briey (around 1/2 second),
or end the call with the telephone.
Make a call:
When you make a call, the sound is automatically trans-
ferred via the relevant Bluetooth connection (depending
on the telephone’s settings) to the DC-20.

20
One of the Bluetooth connections (telephone, code
0000) has priority. This means that the voice dialling and
re-dialling functions only work in this telephone if two
telephones are connected.
- Voice dialling is activated by briey pressing (approx.
1/2 second) the answering button.
- Re-dialling is activated by pressing the answering but-
ton approx. two seconds.
Microphone position:
During a telephone call, it is possible to select between
the modes Omni – Wide, Omni – Narrow and Zoom, using
the mode selectors on the long side of the unit.
Pairing with telephones:
To pair the unit with telephones, see the section “Com-
munication”.
Volume control:
During a telephone call, the volume can be adjusted by
using the menu control on the long side of the unit (this
adjusts the telephone’s volume control). The display
shows the current volume.
Some mobiles require further adjustments to obtain sufciently loud
sound. For example increase the level manually in the media player’s
equalizer (SonyEricsson).
Charging stand
The Conference Microphone DC-20 is delivered with a
charging stand. Apart from charging the microphone, the
stand can be connected to external sound sources. There
are 2 sockets at the right hand short side of the charging
stand, marked 1 and 2 (look underneath).
At socket 1, an external microphone can be connected.
At socket 2, a stronger signal source, such as TV, MP3,
radio etc. can be connected. It is not possible to use both