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junger d02 Operation Manual

Digital dynamics audio processor
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digital dynamics processor
d02
release 3.0 rev.12

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Summary of Contents for junger d02

  • Page 1 digital dynamics processor release 3.0 rev.12...
  • Page 3 INTRODUCTION The digital dynamics processor model d 02 is a professional studio device that processes the dynamic range of digital , as well as analog audio signals. unit comes with digital AES/EBU Interface and high resolution 24 Bit A/D Converters, that allows dynamic range processing (compressor, limiter, expander) in the digital and analog domain.

  • Page 5: Table Of Contents

    CONTENTS The design of the device ..........1.1. Basic functions ............1.2. The Jünger Audio dynamics processor principle ..1.3. A/D-conversion with digital full scale level ....Installation ................. 2.1. Power supply .............. 2.2. Connections ..............2.3. Switches for configuration of the unit ......2.4.

  • Page 7: The Design Of The Device

    1. THE DESIGN OF THE DEVICE THE DESIGN OF THE DEVICE The d 02 digital dynamics processor can be used to process both digital and analog audio signals. The device is primarily designed for use with stereo signals. 1.1. Digital input signals can be connected in the AES/EBU standard format, including SP/DIF and OPTICAL formats.
  • Page 8 1. THE DESIGN OF THE DEVICE traditional compressor Traditional compressor and limiter designs only have one control circuit and limiter designs with corresponding attack 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 listening and comparing.
  • Page 9 1. THE DESIGN OF THE DEVICE fig. 1: Multi - Band Multi - Loop basic principles of dynamic range processors delay Figure 1 shows the basic principles of dynamic range processors. compressor The compression of the programme signal takes place evenly over the entire range and not only at the upper end above a certain threshold level.
  • Page 10 1. THE DESIGN OF THE DEVICE fig.. 2: static characteristics: compressor static output level d02 (dBFS) characteristics: compressor 2.0 : 1 1.6 : 1 1.3 : 1 1.1 : 1 input level (dBFS) compression gain: max. 10 dB parameter: ratio static characteristics: compressor fig.

  • Page 11: A/D-Conversion With Digital Full Scale Level

    1. THE DESIGN OF THE DEVICE The usable dynamic range for digital recording is determined at the top 1.3. by the highest possible digital signal (full scale) and at the bottom by A/D- the lowest possible digital resolution. This range cannot be fully Conversion with exploited when using a conventional analog-digital converter caused...

  • Page 13: Installation

    2. INSTALLATION INSTALLATION 2.1. The digital dynamics processor d02 is a device under the safety category Schutzklasse 1 in keeping with the VDE 0804 standards and Power Supply may only used with power supply installations built according to regulations. Check the voltage details printed at the rear panel are the same as your local mains electricity supply.

  • Page 14: Switches For Configuration Of The Unit

    (Sometimes it is helpful to change the channel status, f.i. if following units don’t want to accept incoming signals.) If using digital input of d02 unit is transparent for channel status information. There is no changing or modification of it possible.

  • Page 15: Setting The Digital Reference Level

    The analog input gain of the d02 should be set so that the maximum possible studio output level which will occur in practice must not overload the A/D converter.

  • Page 17: Control And Display Elements

    3. CONTROL AND DISPLAY ELEMENTS CONTROL AND DISPLAY ELEMENTS All functions of the digital dynamics processor d 02 are activated by buttons. The front panel shows easily recognizable function groups. input By pressing the left button in the input section the required input signal can be selected.
  • Page 18 3. CONTROL AND DISPLAY ELEMENTS preset Press the PRESET button to select the one of the four operating programs of the unit which best corresponds to the kind of audio programme material which is being processed. Each operating program has optimum values of dynamic control characteristics (such as attack and release times etc.) for a different type of programme material.
  • Page 19 3. CONTROL AND DISPLAY ELEMENTS The expander THRESHOLD can be changed upward or downward with two expander buttons and is visible on the LEDs above them. Four expander thresholds (-60 dB, -50 dB, -40 dB, -30 dB) can be selected. The threshold level is related to the choosed digital reference level.
  • Page 20 3. CONTROL AND DISPLAY ELEMENTS limiter The limiter limits the maximum output signal level of the d02 precisely to the set digital reference level. (see also 2.4., and, for details of setting the digital reference level, see under "display"). The limiter should be always active to ensure that output level of the d02 never exceeds the preset digital reference level.
  • Page 21 3. CONTROL AND DISPLAY ELEMENTS The two channel LED display has three display modes (input level, output display 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.
  • Page 22 3. CONTROL AND DISPLAY ELEMENTS The DISPLAY button has a second function in addtion to changing the Setup selections display mode. It is used for setting the internal digital reference level, which is using display key the maximum output level which the limiter will allow to be output by the unit. Hold down the display button continuously for a few seconds and the unit will enter internal digital reference level setting mode.

  • Page 23: Functional Description

    Continuous lighting yellow of an LED also indicates that the digital input signal is a valid AES/EBU digital audio signal which the d02 can synchronise to properly. If AES digital input is selected but the d02 can not synchronise Digital input signals - AES/EBU...
  • Page 24 The sampling frequency (32KHz, 44.1KHz or 48KHz) can be selected with the button in the input section and is displayed by the lighting of a green LED in the d02's front panel sampling frequency display. For applications where analog...
  • Page 25 4. FUNCTIONAL DESCRIPTION The digital audio signal (either an AES/EBU digital input signal or an Digital signal processor analog input converted by the A/D converter) is processed in a Texas Instruments Floating Point Signal processor with a data width of 32 bits.
  • Page 26 The processing of digital audio signals in the signal processor requires a machine-specific format. Special interface circuits are therefore available to convert to standardised digital interface formats. Additionally, an analog output signal is available. A stereo - D/A D/A-converter converter with a resolution of 20 bits generates an analog signal with very high audio quality.

  • Page 27: Application Notes

    5. APPLICATION NOTES APPLICATION NOTES possible choose one of eight different control characteristics for the dynamics processor. Each the four 5.1. different sets of control characteristics provides ideal dynamics Presets control for a different type of programme signal as follows: stereo mode 2-channel-mode 1 - universal...

  • Page 28: Working With Headroom

    The adjustment of the device to this reference level is achieved with pushing DISPLAY and GAIN buttons at the same time (see also chapter 2.4. and 3.). fig. 5: static characteristics: compressor Static output level d02 (dBFS) characteristics: Compressor/ Limiter with -9dBFS Headroom 9 dB Digital Reference 2.0 : 1...

  • Page 29: Selection Of Parameters To Increase Loudness

    5. APPLICATION NOTES When mixing together a delayed signal and a direct signal there may be cancellation of the signal waveform at some frequencies and re- inforcement of the waveform at other frequencies (comb filter effect). Corresponding delay of direct signals should therefore be carried out before mixing them with delayed processed signals.
  • Page 30 5. APPLICATION NOTES A specific redithering is noise shaping, with that the noise modulation of noise shaping the LSB is considering the psycho-acoustic sensitiveness of the human ear. With it can be enlarged the audible dynamic range of a reformatted 16 bit recording ideally by about 3 bits i.e.

  • Page 31: Applications

    APPLICATIONS - mastering of CD, DCC, MD maximum recording level without clipping increased programme density and loudness - digital recording and mixing increased loudness level (compressor, limiter) eliminating noise signals (expander) - FM-Broadcast, TV-Sound signal conditioning matching dynamic range of different programme signals increasing signal loudness level - limiter for digital or analog transmission links always digital full scale signal, without clipping...

  • Page 33: Technical Specification

    TECHNICAL SPECIFICATION sample rate : 30 kHz ... 50 kHz digital audio data format : 24-bit (AES/EBU) input / output 24-bit (A/D-,D/A-converter) AES/EBU level : 5 Vpp / 110 Ohm, balanced connector : input format : AES professional, AES consumer output format : same as input S/PDIF...

  • Page 34: Warranty And Service Information

    8. WARRANTY AND SERVICE INFORMATION WARRANTY AND SERVICE INFORMATION JÜNGER AUDIO grants a two-year warranty on the d02 dynamic range processor If the unit has to be serviced, please send it, ideally in the original box, to: JÜNGER AUDIO - Studiotechnik GmbH Justus-von-Liebig-Str.
  • Page 35 KONFORMITÄTSERKLÄRUNG DECLARATION OF CONFORMITY Geräteart : Digitaler Dynamikprocessor Type of equipment : digital dynamics processor Produkt / Product : Das bezeichnete Produkt stimmt mit den Vorschriften folgender EU-Richtlinie(n) überein: The aforementioned product complies with the following Europaen Council Directive(s): 89/336/EWG (geändert durch 91/263/EWG und 92/31/EWG) (changed by 91/263/EEC and 92/31/EEC) Richtlinie der Rates zur Angleichung der Rechtsvorschriften der...

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