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3. CONTROL AND DISPLAY ELEMENTS

 

 
 
 

 

  
 
 
The  two channel LED display has three display modes (input level, output 
level and gain change).  Press the button  in the display section to change 
the display mode. The  selected display mode is indicated by the  lighting  of 
the appropriate LED above the display button and to the left of  the  display 
meters.  For better visibility each display mode has its own LED colour and 
level meter colour. 

display

 

Green

 shows the 

input level

 and 

yellow

 the 

output level

. The scale located 

between the two bars indicates the levels. The display which ranges from -50 
... 0 dBFS (dB Full Scale) refers to the digital reference level, with a 
resolution  of 2 dB in the upper section. This does not allow a precise 
adjustment, but it does give an indication of the existence and the level of 
digital input and output signals. 

peak hold

 function is available for input and output which makes improved 

registration of a momentary peak level possible. 
If  excessive level at the input occurs when the input level display  is selected   
(if digital  audio samples  at  the maximum permissable positive or negative 
sample value  occur at  the digital input) then the red  clip-LED  at the 
extreme right-hand end of the level meter lights up and indicates overloads 
which are already present  in the input signal.    
When  viewing  the OUTPUT level the clipping  LED  does  not light since  
the  limiter is ON and ensures that the  maximum  output signal level can not 
exceed the preset reference level. 
The   level  meter  display  is  a  digital  meter   without integration  time,  and  
records  every successive  digital sample value. 
 
The  third  display  mode, gain change,  shows  the  current control levels of 
the limiter and compressor in dB. 
The  compressor  works to reduce overall  dynamic  range  by insertion of 
additional gain for lower level signals  (ie no gain  reduction).  The scale 
above the upper meter bar shows the additonal gain inserted by the 
compressor.  Lighting  of LED's in the meter starts on the left and moves 
torwards the right as more additional gain is applied. 
The  limiter  works to reduce the level of high level  input signals so that they 
do not exceed the preset reference maximum  level. The scale below the 
lower meter bar  shows the  level reduction by the limiter.  Lighting of  LED's  
in the meter starts on the right and moves torwards the left as the amount of 
level reduction (limiting) required increases. 
A  red LED is visible in the compressor gain display , which indicates the 
maximum permissable value of compressor  gain. This  value can be 
changed in the range +2dB to +15dB   (see section on operation of the 
compressor on page 10 for details  of how to change the maximum 
permissable compressor gain). 
 

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Summary of Contents for d02

Page 1: ...DIGITAL DYNAMICS PROCESSOR D02 OPERATIONS MANUAL rev 3 1 Justus von Liebig Stra e 7 12489 Berlin Germany Telefon 030 67 77 21 0 Fax 030 67 77 21 46 www junger audio com...

Page 2: ...e of the processing noises typical for dynamic range prossesors such as pumping breathing or signal discolouration The unit is easy to operate and requires only a limited selection of settings All oth...

Page 3: ...unit 2 4 Setting the Digital Reference Level 3 Control and display elements 12 4 Functional description 18 5 Application notes 23 23 23 24 25 26 26 5 1 Presets 5 2 Processing signals containing emphas...

Page 4: ...so be achieved 1 1 Basic Functions 1 In addition an analog stereo signal output is available which operates with 20 bit D A converters and enables a rapid acoustic monitoring The increase of signal de...

Page 5: ...k and release times which have to be adjusted manually by the user An optimal setting of all parameters for dynamic range processing with as little disturbance as possible must be determined by listen...

Page 6: ...The gain control circuit has time to preview the signal and become active before it reaches the output This is particularly important for the limiter which provides a precisely leveled output signal...

Page 7: ...range of the input signal to match the dynamic range of the storage or of the transmission system is partly achieved by increasing the level of low level signals the lowest of which might otherwise b...

Page 8: ...gain max 10 dB parameter ratio 50 40 30 20 10 0 50 40 30 20 10 0 input level dBFS output level d02 dBFS off 5 dB 10 dB 15 dB static characteristics compressor compression gain max 15 dB parameter com...

Page 9: ...verter with 18 or 20 bit resolution is used It is therefore more important than noise shaping or other dither techniques to use primarily the maximum of available digital dynamic range because this im...

Page 10: ...2 1 Power Supply 2 2 Connections 2 POWER INPUT IEC mains input connector 230 V 50 Hz UK 240 V 50 Hz JAPAN 100 V 60 Hz USA 127 V 60 Hz with integrated fuse REMOTE for optional serial remote interface R...

Page 11: ...AES EBU data stream With the digital dynamics processor d02 it is possible to transmit this information without changing or to set these information defined Sometimes it is helpful to change the chan...

Page 12: ...l mastering and transmission the output level should be the maximum i e the digital reference level should be 0dBFS When working with analog inputs it is very important not to overload the A D convert...

Page 13: ...frequency at which the A D converter operates is generated internally When ANALOG EXT LED is lit the unit uses the same analogue input audio signal as when ANALOG INT is selected but now the sampling...

Page 14: ...erence level setting mode The PRESET and the GAIN display flashes and and the GAIN display shows the digital reference level The STEREO 2 CHANNEL mode can now be changed pressing the SELECT button Wit...

Page 15: ...1 1 1 1 3 1 1 6 1 or 2 1 There is also a compressor off position where the compressor function is turned off In this case none of the ratio LEDs will be lit Compression is partly achieved by increasi...

Page 16: ...turned off The limiter works with a look ahead time signal delay of approx 2 ms This delay time is present even when the limiter is turned off Two different reference levels can be set one reference l...

Page 17: ...es overloads which are already present in the input signal When viewing the OUTPUT level the clipping LED does not light since the limiter is ON and ensures that the maximum output signal level can no...

Page 18: ...few seconds and the unit will enter internal digital reference level setting mode The GAIN display flashes and shows the digital reference level Setup selections using display key The maximum output l...

Page 19: ...ured input signal sampling frequency is one of the standard frequencies 32kHz 44 1kHz or 48kHz then a corrresponding LED will light yellow in the input section on the units front panel Continuous ligh...

Page 20: ...sable analog input level without clipping when the unit is supplied is 15dBu Both analog inputs are converted into digital audio signals which can then be processed by the internal digital dynamics pr...

Page 21: ...dth of 32 bits The use of 32 bit digital audio sample length in calculation ensures that there is no deterioration in signal quality even if AES EBU digital audio data with the maximum word length of...

Page 22: ...prox 2 ms is built in This delay makes it possible to arrange the algorithm of the limiter in such a way that the control mechanism is activated before maximum level is reached Within the rise time of...

Page 23: ...o 9dBFs 9dB below the maximum possible level that can be represented digitally then the actual maximum digital level that will be received by the D A converter will be 9dB below the maximum possible d...

Page 24: ...nd the basic Multi loop principle of the J nger Audio dynamics processors please refer to chapter 1 2 Fixed presets containing optimised parameters for different types of programme signal are used bec...

Page 25: ...will change to red The static characteristics of the d 02 see also fig 2 usually refers to the digital reference level 0 dBFS dB Full Scale This is useful for most applications of the dynamics process...

Page 26: ...o signal before changing it That is the signal curve can be changed before maximum level is reached For further details see chapter 1 This delay must be considered before attempting to mix signals pro...

Page 27: ...imiter which means that the limiter then reduces the signals continually and again reduces the additionally applied amplification The display for Limiter Gain Reduction should be in the region of 0 6...

Page 28: ...e to more than 110 dB To make this quality audible the CD must of course be played back with appropriate monitoring equipment D A converter amplifier for 20 bit quality noise shaping The disadvantage...

Page 29: ...n and ADR studios adjusting dynamic range and loudness level of individual takes maximum recording level without clipping A D converter free of overload for general use high performance 24 Bit ADC in...

Page 30: ...INK A D converter stereo 24 Bit oversampling dynamic range 112 dB RMS 114 dB A weighted input level 12 22 dBu for 0 dBFS adjustable input XLR floating balanced 10 kOhm optional transformer balanced D...

Page 31: ...a two year warranty on the digital dynamics processor MODEL d02 If the unit has to be serviced please send it ideally in the original box to J NGER AUDIO Studiotechnik GmbH Justus von Liebig Str 7 D 1...

Page 32: ...tion of the laws of the Member States relating to electromagnetic compatibility Zur vollst ndigen Einhaltung dieser Richtlinie n wurden folgende Normen herangezogen To fully comply with this these Dir...

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