Cedar dns 2 Bedienungsanleitung
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English
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AN INTRODUCTION TO THE DNS 2
The DNS 2 is a further development of the DNS technology introduced in
the Academy Award winning DNS1000 and the DNS 8 Live dialogue noise
suppressors. It is small, light and portable, and ideal for use on location as well
as in the studio and in post. Offering two channels of dialogue noise suppression,
its simple user-interface allows users to obtain optimum results almost instantly
and with the minimum of effort. Nonetheless, it retains the near-zero latency of its
predecessors and, with its 4-pin 12VDC power socket, it’s suitable for use in all
live situations - not just on location and for live-to-air broadcasting, but also for live
sound in venues such as theatres, concert halls, conferences venues, and places
of worship.
The DNS 2 operates by dividing incoming signals into a large number of
bands. Sophisticated lters analyse each of these and then suppress the noise
independently in each. The innovative design of the lter bank eliminates the
need to select the range of frequencies in which the unit will operate, and it’s not
necessary to adjust the amount of attenuation in individual bands.
Features:
■Near zero latency
A group delay of less than 1ms, so there is no loss of lip-sync.
■Flexibility
The ability to handle a wide range of noise suppression requirements.
■Speed and ease of use
A carefully designed user-interface that maximises speed of use.
■Audio interfaces
24-bit digital audio interfaces conforming to AES/EBU standards plus high-
quality analog mic/line inputs with optional +48V phantom power.
■12VDC power
The ability to work anywhere in the world.
■Powerful processors
The latest high resolution oating-point processors to ensure that it handles
the most complex processing requirements.
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SAFETY INSTRUCTIONS
Read these instructions, and follow them.
■Water and moisture
The DNS 2 and its power adapter must not be exposed directly to rain or
moisture. Furthermore, if it is brought directly from a cold environment into a
warm one, moisture may condense inside it. Allow the equipment to reach
ambient temperatures naturally before connecting the power.
■Mounting and ventilation
Do not subject the equipment to strong sunlight, excessive dust,
mechanical vibration or periodic shocks. It is not susceptible to excessive
heat build-up, but should be installed away from heat sources such as
radiators and audio devices that produce large amounts of heat.
■Connections
Turn off the power to all equipment before making connections.
■Cleaning
Clean the equipment only with a dry cloth. Never use abrasive pads or
liquid cleaners such as alcohol or benzene.
■Damage requiring service
The equipment contains no user-serviceable parts and should on no
account be opened or dismantled by unauthorised personnel.
The equipment should be returned to qualied service agents when it has
been exposed to liquids, when it fails to function correctly, when it has
been dropped, or when the case is damaged.
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OPERATION
Unpack the DNS 2 carefully. Save the carton and all packing materials since you
may need them in the future. In addition to the DNS 2, the box should contain:
■12V DC power supply
■start-up and safety instructions sheet
■warranty registration card
To maintain reliability and prolong operating life, observe the following
environmental considerations:
■the temperature should be maintained between 5º and 30º Celsius
■relative humidity should be in the range 30% to 80% non-condensing
■ strong magnetic elds should not exist nearby.
Power sources
Power is supplied by an external DC source of 8–17.5V with a lm industry 4-pin
XLR. A 12V PSU is included with the unit and this will work on any mains supply in
the range 85V to 250V, 50/60Hz AC. Connect its output to the DNS 2 power input
and then plug it into the mains supply.
Press the power on/off button to switch power on and off:
■ press the button briey to switch the power ON
■hold the button for a couple of seconds to switch the power OFF
Controls
Each channel has its own process controls and indicators. These comprise two
illuminated push buttons, a rotary encoder with an integrated push switch, and a
small dot-matrix display. These are used for both setup and process control.
Connections
The DNS 2 offers analog and digital audio connections. It can pass its signal to
both outputs irrespective of the input used.
Select the active audio input using the two-position toggle switch on the side of the
unit. When the analog inputs are in use, a three-position switch for each channel
selects between line, microphone and microphone with +48V phantom powering.
Analog input
Set the input selector switch to ANALOG IN (switch to left).
Connect microphones or line level signals to the analog input XLRs. Select LINE,
MIC, or 48V (MIC with 48V phantom power) for each input as appropriate. Connect
the analog and/or digital XLR outputs to suitable inputs on your recording or
monitoring equipment.
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Internal Sync
When the analog inputs are selected, sychronisation is derived by default from a
xed internal 48kHz clock, and the digital output clock is derived from this internal
clock.
External Sync
To use the analog to digital conversion of the DNS 2 at a sample rate other than
48kHz, or to lock its digital outputs to house sync, connect an AES3 or AES11 sync
signal to the digital input. The front panel sync LED will show green, and the DNS 2
will automatically synchronise to the external signal. Operation at 44.1kHz, 48kHz
and 96kHz is supported.
Gain
Press the SETUP button to monitor the input signal level on the displays. If desired,
you can use the encoders to adjust the gain of the analog input for each channel.
Press the SETUP button again to return to the process control page.The operations
of the controls and displays will also revert to process control page after a short
idle period.
Digital input
Set the input selector switch to DIGITAL IN (switch to right) and connect an AES
digital source to the digital input XLR. Connect the digital and/or analog output
XLRs to suitable inputs on your recording or monitoring equipment.
The unit will lock to any AES3 signal with a sample rate of up to 96kHz that is
presented to its inputs. Operation is supported at 44.1kHz, 48kHz and 96kHz.
Sync
If the input selection switch is set to digital and no valid digital signal is present
at the digital input, the SYNC LED will light up red and the DNS 2 will not process
audio.
Enabling the analog outputs
The analog I/O accounts for about one third of the DNS 2’s power consumption. To
save power, it will shut down when the digital input is selected, resulting in digital-
to-digital operation.
To use the DNS 2 “digital IN, analog OUT”, you can re-enable the analog outputs
by pressing SETUP to enter the setup page and then pressing both DNS ON
buttons simultaneously. Repeat this operation to switch the analog outputs off
again.
USB
There is a USB socket for updating the rmware.
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Processing
Process On/Off
Use the DNS ON buttons to switch the DNS process on and off for each channel.
Learn
The LEARN buttons control whether or not the noise detector adapts continuously
to the noise in the audio signal; switching it off freezes the noise estimate until it is
switched on again. LEARN is not a method for taking a ‘noise ngerprint’ and, for
most jobs, best results are obtained by leaving it switched on permanently.
Attenuation
The default action of each encoder is to adjust the amount of noise attenuation
applied to the signal, and this is shown on the left-hand half of the display. The
representation of the fader within the display shows the current position of the
control, and the bargraph shows the instantaneous amount of attenuation being
applied to the signal. The solid bar shows the average attenuation across all
frequencies, and the shaded bar shows the maximum attenuation across all
frequencies.
Bias
The encoder also provides control of the Bias, which is shown on the right-hand
half of the display. Click an encoder to enable adjustment of the Bias, and click it
again when you wish to switch back to controlling the Attenuation. The encoders
will also revert to controlling the Attenuation after a short idle period.
The Bias is a ‘center-zero’ control, and the fader shows the current position. Raise
the Bias to increase the amount of noise detected. This will allow the process to
remove more noise, but may lead to compression of the wanted audio and make
the signal sound dry. Lower the Bias to decrease the amount of noise detected.
This will allow the process to retain more ‘atmos’, but it will remove less noise.
The right-hand bargraph shows the detected long-term signal to noise ratio (SNR).
The solid bar shows the detected noise level, and the shaded bar shows the
detected long-term signal level; consequently, the difference between the heights
of the solid and shaded bars indicates the long-term SNR. When the Bias is above
or below center, it biasses the noise detector somewhat upwards or downwards.
You can see this effect reected in the height of the solid bar, which tends to
increase as you raise the Bias (and vice-versa).
Linking
The two channels of the DNS2 can operate in three different link modes. You can
cycle through these by pressing both encoders simultaneously.
Unlinked: The two channels of the DNS2 operate completely independently. This
mode is useful for processing two separate sources, for example a boom mic and
a radio mic.
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Linked: The audio channels remain separate, but their control settings are linked
together. This mode is particularly suitable for stereo signals. (When using analog
inputs, the input gains are linked if both are set to mic or both are set to line, but if
one input is set to mic and the other to line then the input gains are not linked.)
Mono split: Input channel 1 is split and sent to both process channels and
outputs. The channel 2 input signal is not used in this mode. The process channels
have independent controls, so this allows a single input signal to be processed in
two different ways, or (by switching off the processing of one channel) for the two
outputs to be processed and unprocessed versions of the channel 1 input signal.
The input selection and link mode are indicated at the bottom of the process
channel displays. Linked mode is indicated by an ‘=’ symbol, and mono split
mode is indicated by an ‘>’ symbol. The input selection is indicated by M/L/D for
microphone, line or digital respectively, followed by a 1 or 2 to indicate the input
channel number. Hence, in mono split mode both screens show channel 1.
Other information
Panel lock
A toggle switch on the side of the DNS 2 disables all of the front panel controls
with the exception of the power button, which can still perform its power on
function. In general use, switch this to OFF (switch in upper position). Switch it ON
to prevent accidental adjustment of the front panel controls.
Screensaver
The intensities of the displays and front panel LEDs will drop after a period of
inactivity. Touching any control will bring the brightnesses back to normal.
Signal level LEDs
Bi-colour LEDs indicate the signal level for each channel:
■Off = silence
■Green = normal
■Red = close to clipping
Synchronisation LED
The sync LED indicates the current sync source as shown in the following table:
Input switch Digital input lock Sync status Sync source Audio source Sync LED
Analog No Normal Internal Analog Off
Digital No Error Internal Mute Red
Analog Yes Normal External Analog Green
Digital Yes Normal External Digital Green
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Storage of settings
The DNS 2’s current settings are stored every time the buttons and screens go
dim, which happens a few seconds after the user stops adjusting the controls.
These settings are recalled when the DNS2 is turned on.
Power On/Off
Switch the DNS 2 on and off using the power button. Units from serial number
DNS-2-11017 onward power up automatically when external power is rst applied.
If a problem occurs, you can switch the unit off by pressing the power on/off button
for ve seconds or more to perform a ‘hard’ power off.
Summary of operation
LEARN
When LEARN is on, the DNS 2
continually identies the power
and spectral distribution of
the noise present. This is the
normal mode of operation.
When LEARN is off, the noise
identication is frozen at the
last determined values.
Bias
Adjusts the amount of noise
detected by LEARN. You can
bias the detection upward
(more noise detected)
or downward (less noise
detected).
Attenuation
Determines how much noise will be removed from the signal.
Summary
LEARN and Bias determine what is detected as noise.
Attenuation determines how much of the detected noise is suppressed.
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