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9.0   REAL TIME ANALYSER OPTION

The Real Time Analyser (RTA) option for the digEQ is a plug-in DSP module which

provides a filter based, 31 band analyser as defined in EN60651 for sound level

meters. An RTA based on filters rather than Fast-Fourier-Transform (FFT), as used in

the vast majority of analysers,  offers a greater degree of accuracy and a faster

response. The RTA displays both peak and average levels, with averaging and peak

decay times being user adjustable. The range displayed on the screen and the

reference level are also user adjustable. Measured curves can be frozen and stored in

one of 45 nameable memories.

When using a microphone for measurements the analyser can be used in either

dBSPL (Sound Pressure Level) or dBu (relative) mode. In dBSPL mode the display is

fixed to the sensitivity of the measuring microphone whereas the dBu scale does not

require a calibrated mic and gives a relative reading.

Graphic EQ faders can be superimposed onto the analyser screen allowing real time

EQ adjustments to be made and viewed. The RTA input source is selectable from

Channel A or B, input or output, or from an external microphone. Microphone

calibration curves for 4 different types can be stored in named locations.

The RTA module includes a pink noise generator with a switched level, balanced

output. The noise generator can also produce two types of Click (burst of pink noise)

output.

9.1   EXTERNAL CONNECTIONS

MIC I/P

Balanced input for an external microphone. Input impedance is 2k ohm and pin

assignment is -

Pin 1

Screen

Signal ground

Pin 2

Hot

Pin 3

Cold

Signal -

Phantom power (+15V) is available via RTA SETTINGS 1 > MICRO:

NOISE O/P

Pink Noise generator output. This output is electronically balanced with an

impedance of <100R. Pin assignment is -

Pin 1

Screen

Signal ground

Pin 2

Hot

Pin 3

Cold

Signal -

Summary of Contents for DPF3103

Page 1: ...DPF3103 Dual Programmable Graphic Parametric Shelving Equaliser and Dynamics Processor OPERATORS MANUAL Version 2 1 January 2001 ...

Page 2: ...2 This page left intentionally blank ...

Page 3: ...lect 14 Gain 15 Bypass 15 Flat Reference 15 Utility 15 Function 16 Delay Range 17 Escape 17 Data Wheel 17 Enter 17 Parameter 17 Keyboard Lock 17 4 3 DISPLAYS 18 Clip 18 Level meters 18 Gate 18 Program 18 Main display 18 Contrast 18 Brightness 18 5 DESCRIPTION OF MAIN FUNCTIONS 5 1 GRAPHIC EQUALISER 19 20 Selecting Channel A B 19 Linking channel A B 19 Linking with offset 19 Adjusting individual Fr...

Page 4: ... with Offset 29 Selecting adjusting Parameters 29 Bypass 30 8 2 FITTING THE DELAY OPTION 30 Before you start 30 Procedure 30 9 REAL TIME ANALYSER OPTION 9 1 EXTERNAL CONNECTIONS 32 MIC I P 32 Noise O P 32 9 2 OPERATING THE RTA 33 Analyser 33 RTA settings 1 34 RTA settings 2 36 Correction 37 9 3 FITTING THE RTA MODULE 38 Before you start 38 Procedure 38 10 DIGITAL I O OPTION 10 1 EXTERNAL CONNECTIO...

Page 5: ...ed by pressing the function buttons to the right of the screen You are automatically in edit mode for the program number displayed to the left of the screen If you change any data affecting the audio the EDIT light will come on If you wish to leave this program an on screen message will ask you to store or discard the changes Refer to Section 4 0 Description of Controls for STORE RECALL COMPARE pr...

Page 6: ... Unlock Keyboard Press and hold ENTER then press ESCAPE Select Frequency Range Press the lower and upper frequency buttons together Select Dual Channel Editing Press and hold Channel A and then press Channel B buttons and release together and vice versa SCRATCH PAD MEMORY All editing is done in the Scratch Pad memory which can then be saved to a Program memory Editing is real time and will affect ...

Page 7: ...e recommend you do not operate the unit close to strong emitters of electromagnetic radiation such as power transformers motors mobile telephones or radio transmitters The unit should only be connected to a power supply of the type described in 2 4 POWER REQUIREMENTS or as marked on the unit Disconnect the mains supply before removing any cover 2 4 POWER REQUIREMENTS The DPF3103 is fitted with a u...

Page 8: ...al For unbalanced operation join pins 1 and 3 and connect to Screen signal ground and use pin 2 as Hot signal OUTPUT A and B These are transformer balanced and provide low impedance electrically isolated outputs on XLR M connectors Pin assignment as shown Pin 1 Screen Signal ground Pin 2 Hot Signal Pin 3 Cold Signal For unbalanced operation join pins 1 and 3 and connect to Screen signal ground and...

Page 9: ...ys for soft switching and automatic bypass in the event of a power failure However these relays can be configured by way of internal jumpers to mute the outputs rather than bypass Jumper links fitted for power down BYPASS mode factory default Jumper links fitted for power down MUTE mode ...

Page 10: ...essary to return the unit to an LA Audio authorised service centre or to the factory with a dated receipt as proof of purchase After repair the unit will be returned to you free of charge Limitations This warranty does not cover damage resulting from accident or misuse The warranty is void unless repairs are carried out by an authorised service centre The warranty is void if the unit has been modi...

Page 11: ... used to store Meter settings Backlight timer MIDI channel etc 4 Real Time Analyser used to store up to 45 RTA Curves STORING A PROGRAM Used to store the contents of the Scratch pad to a numbered and named program location Remember you cannot save to Program 00 Press STORE A dialogue box shows the current Program number and name Use the DATA WHEEL to select a program number and press STORE If the ...

Page 12: ...ess up to a maximum of 12 characters To exit naming press ESCAPE If you wish to return to a particular screen each time you RECALL a Program select the page e g Graphic Parametric Limiter etc before you STORE otherwise you will RECALL the Home page After pressing ESCAPE select the function and then save the Program With the optional RTA module see Section 9 fitted a second line Curve name is shown...

Page 13: ...d name Use DATA WHEEL to select Program Dialogue box shows selected Program number and name Press COMPARE to toggle between the current edit and the selected Program The current edit is indicated by the EDIT led Press ESCAPE to exit COMPARE mode You can of course RECALL a program and then COMPARE that with another Program ACCESS ACCESS has two functions depending on whether the DPF3103 is being us...

Page 14: ...nts are made to the selected channel only To select both press and hold A then press B and release together CHANNEL SELECT buttons are not functional in the HOME and UTILITY pages Channel selection A B or both is maintained in all editing processors and STORE Check you have the correct Channels selected before making changes FREQUENCY SELECT 20 20k The function of these buttons depends on which pr...

Page 15: ...dually BYPASSED when not linked Bypass is separate for each of the processors and its operation should be thought of as similar to bypass switches on four separate processing units The associated LED is lit when a processor is BYPASSED FLAT REF FLAT For the Graphic and Parametric Filters processors FLAT resets all EQ gain settings to zero i e flat response on the selected channel s A dialogue box ...

Page 16: ...HINE MODE The DPF3103 can be a Master or Slave unit In standalone mode i e no Network detected this defaults to Local Device If this is not set to Local Device the front panel controls except the DATA WHEEL and ENTER button will not operate Please refer to the digEQ Networking manual for details of using the DPF3103 as a Slave unit FUNCTION These buttons provide access to the main processors see S...

Page 17: ...it Naming a Program mode DATA WHEEL The DATA WHEEL has two functions which are selected by pressing the wheel momentarily and are shown by the two LED s above the wheel In general PARAMETER mode moves the cursor around the screen or menu and DATA mode edits the value selected ENTER Press to confirm the Store and Recall commands In the Home page press ENTER to start name a program PARAMETER Used to...

Page 18: ...e UTILITY page back lit annunciators show selection The 0dB led lights when 4dBu is present at the Input or Output of the DPF3103 GATE These LED s provide a visual indication that the noise gate is closed i e signal muted PROGRAM Displays the Program memory number for STORE COMPARE and RECALL modes MAIN DISPLAY Back lit 240 x 60 LCD display CONTRAST Adjusts the viewing angle of the Main Display Al...

Page 19: ...qualiser SELECTING CHANNEL A B To edit Channel A or B press it s associated CHANNEL SELECT button Only the selected channel is shown on screen and is displayed as follows LINKING CHANNEL A B Press and hold CHANNEL SELECT A Press CHANNEL SELECT B and release both buttons together Both channels are displayed on screen and any editing will affect both channels equally LINKING WITH OFFSET Offset linki...

Page 20: ...ed It can also be used to set different gains for Channels A B which can then be linked for overall adjustment see LINKING WITH OFFSET BYPASS BYPASS acts on the selected channel or channels and has the effect of returning all faders to their 0dB flat positions 5 2 PARAMETRIC FILTERS PARAMETRIC The parametric equaliser on the DPF3103 has 3 fully variable frequency gain and bandwidth bands Each band...

Page 21: ...r They will be Linked To copy B to A press and hold CHANNEL SELECT B first You can of course use the Parametric for stereo without linking channels bearing in mind that the overall GAIN must also be adjusted separately Channel selection also affects the Filters SELECTING A PARAMETRIC BAND Use the blue buttons below the screen to select Frequency Gain or Bandwidth for any of the 3 bands and adjust ...

Page 22: ...ers DATA WHEEL defaults to adjust frequency DATA mode Available frequency ranges are 16Hz to 630Hz for the high pass and 656Hz to 20kHz for the low pass filters GAIN GAIN affects signal level through the Parametric Filters and Shelving equalisers BYPASS BYPASS operates on the selected channel s and affects both the Parametric EQ and Filters 5 3 HIGH LOW SHELVING EQ The Shelving equaliser on the DP...

Page 23: ...are Threshold 20dB Gain 0dB Ratio LIMIT Knee Soft Attack 1mS Release 200mS and both channels are selected Press DYNAMICS button once to select the COMPRESSOR LIMITER page Press DYNAMICS a second time to select the EXPANDER GATE page Press DYNAMICS again to return to COMPRESSOR LIMITER page SELECTING CHANNEL A B To edit Channel A or B press it s associated CHANNEL SELECT button LINKING CHANNEL A B ...

Page 24: ...RESHOLD Threshold range is 20dBu RATIO Available Ratios are 1 4 1 2 1 3 1 4 1 6 1 8 1 16 1 and Brick wall Limiting ATTACK Attack range is 20µS to 100mS RELEASE Release is adjustable from 20mS to 5S KNEE Compression slope can be selected between HARD or SOFT knee BYPASS BYPASS only affects the Compressor Limiter When bypassed the GR meters do not operate 5 5 EXPANDER GATE The Expander Gate on the D...

Page 25: ...ter with the buttons and adjust each in turn with the DATA WHEEL Alternatively you can use the DATA WHEEL to both select parameters and adjust values THRESHOLD Threshold range is 60dBu to 0dBu RATIO Available RATIO s are 1 2 1 3 1 4 1 8 1 16 and Gate ATTACK Attack range is 20µS to 100mS RELEASE Release is adjustable from 50mS to 5S KNEE Expansion slope can be selected between HARD or SOFT knee BYP...

Page 26: ...ic sensitive devices so do take ESD precautions Do not touch the components on any of the printed circuit boards PROCEDURE To change the back up battery remove the 8 off M2 5 countersunk screws securing the cover The battery is located on the main board see diagram The battery is removed by lifting the metal tag and sliding the battery out of the holder You now have 30 seconds to replace the batte...

Page 27: ...the printed circuit boards Hold the modules by the edges only PROCEDURE Working with the front of the DPF3130 towards you remove the six M2 5 countersunk screws securing the cover Locate the memory ICs marked U31 U34 and U35 on the following diagram Take a note of the orientation of the ICs before removing them The two EPROMS U31 and U35 have their pin 1 marker towards the back of the unit U31 sho...

Page 28: ...omes free U31 is marked P48 xxxx where xxxx refers to the revision U35 is marked DGQ xxx where xxx refers to the revision U34 is marked MST xxx where xxx refers to the revision U33 is used in conjunction with the DIGITAL I O option When fitting U34 check that the sloping side with an arrow indicating pin 1 is facing towards the front of the unit next to C128 Make sure the IC sits level in the sock...

Page 29: ...nce to select the samples time distance and temperature page Press DELAY a second time to select the Frames per second page Press DELAY again to return to the previous page Default settings Program 00 for the Delay page are both channels selected and Delay 1 3ms minimum Samples 64 Temperature 20 C Frames 0 03 25 frames s SELECTING CHANNEL A B To edit Channel A or B press it s associated CHANNEL SE...

Page 30: ...sunk screws securing the cover Locate the two sets of main board connectors J10 11 and J13 14 mid way along the front edge of the main board Check the orientation of the Delay module i e the writing on the module should be correct reading when viewed from the front of the DPF3103 Position the module over the main board connectors and check the pin alignment All pins are used so there should be no ...

Page 31: ...31 8 0 DELAY OPTION Diagram showing position of Delay Modules ...

Page 32: ... measuring microphone whereas the dBu scale does not require a calibrated mic and gives a relative reading Graphic EQ faders can be superimposed onto the analyser screen allowing real time EQ adjustments to be made and viewed The RTA input source is selectable from Channel A or B input or output or from an external microphone Microphone calibration curves for 4 different types can be stored in nam...

Page 33: ...d the top line shows the reference or range value and the analyser source Default settings for the Analyser are Input Micro REFERENCE 10 dBu RANGE 20dB range Use the keys to select the parameters and adjust using the DATA WHEEL or alternatively use the DATA WHEEL to both select and adjust each parameter SOURCE Use the DATA WHEEL parameter mode to select the required source Available options are In...

Page 34: ...ng the ENTER stops the analyser and holds the current display This frozen curve can then be stored and recalled using the STORE RECALL function in the RTA SETTINGS 2 menu HOLD is displayed to the right of the display ESCAPE Press the ESCAPE button to restart the analyser RTA SETTINGS 1st page This menu gives access to the Noise generator Release times Microphone gain Phantom power and Microphone r...

Page 35: ... ENTER to confirm Display changes to MIC page MIC menu This menu is used to enter microphone sensitivity and frequency response values The top line of the display shows the microphone number the frequency selected the gain at that frequency and sensitivity Press RTA button twice to select RTA SETTINGS 1 Use buttons to select MICRO Use DATA WHEEL to select required microphone number Press ENTER to ...

Page 36: ...lternatively use the DATA WHEEL to both select and adjust each parameter Default settings are Weight NONE Store 1 Recall 1 WEIGHT This function allows weighting filters to be added to the analyser s response The choices are standard A weighted C weighted curves and NONE STORE The STORE function allows up to 45 measurement curves to be saved All parameters i e release times weighting microphone set...

Page 37: ...onfirm Press RTA to display the recalled curve If the last curve in the Scratch Pad was not saved a Current CURVE not saved message is displayed In this case you can either Press the RTA button to cancel RECALL and then STORE the current CURVE OR Press ENTER to overwrite the CURVE in the Scratch Pad Pressing the RTA or any other FUNCTION button during STORE or RECALL rather than ENTER to confirm c...

Page 38: ... overall effect of GRAPHIC CORRECTION go to the GRAPHIC press the GRAPHIC button page 9 3 FITTING THE RTA MODULE Note This module will only work with software DGQ600 and higher BEFORE YOU START Disconnect the mains supply Do take ESD precautions Don t touch components on any of the printed circuit boards 10 Hold the RTA module by the edges of the metal panel only PROCEDURE Remove the six M2 5 coun...

Page 39: ...t AES EBU and S P DIF format digital inputs and outputs With this module fitted the DPF3103 can have either analogue or digital inputs however both analogue and digital outputs are available Output sample rate can be set at 44 1kHz 48kHz or 96kHz or Synchronised to an external Word Clock or the Digital Input ...

Page 40: ...hono connector WORD CLK Word clock input on BNC connector 10 2 OPERATION Settings for the Digital I O option are accessed through the UTILITY menu With the module fitted there are two additional items on the UTILITY menu SELECTING AND ADJUSTING PARAMETERS Select the parameter with the buttons and adjust each in turn with the DATA WHEEL Alternatively you can use the DATA WHEEL to both select parame...

Page 41: ...o DPF3103 and digital out to an external digital unit In this case the output sample rate of the digEQ can be synchronised to the Word Clock of the external unit Connect the Word Clock out of the external unit to the Word Clock in of the digEQ Press UTILITY button Select Digital Output SR Using DATA WHEEL select Word Clock Digital input to the DPF3103 When Digital Input is selected UTILITY Source ...

Page 42: ...uts securing the blanking plate Fit the nut and washer supplied to the BNC WORD CLOCK connector Plug the flying lead connector into J16 AES OPTION With the component side of the Digital module facing down locate the connectors through the rear panel of the DPF3103 ...

Page 43: ...he No 4 self tap screw to position D S P DIF connectors Secure the WORD CLOCK BNC connector with the nut supplied Replace the cover plug in the mains cable and switch the unit on Press UTILITY and check that DIGITAL INPUT and DIGITAL OUTPUT SR menus are displayed Check that all the other front panel controls are still working OK ...

Page 44: ...k 3 15k 4k 5k 6 3k 8k 10k 12 5k 16k 20k Bandwidth 2 3rd octave Gain 15dB 0 5dB resolution PARAMETRIC EQUALISER Number of bands 3 per channel Frequency range each band 20Hz to 20kHz 1 18th octave resolution Gain 40dB to 15dB 0 5dB resolution Bandwidth 1 32 to 2 octaves HIGH LOW PASS FILTERS High pass filter 16Hz to 2kHz 1 18th octave resolution Low pass filter 160Hz to 20kHz 1 18th octave resolutio...

Page 45: ...bs 11 2 DELAY Units Seconds Metres Feet Samples Frames 24fr s 25fr s 30fr s or 30 drop frame Resolution 0 1ms 0 01m 0 1ft 1 sample Range 1 3ms to 1 36s 0 45m to 470m 1 5ft to 1 540ft 0 03fr s to 32fr s Temperature compensation 0 o C to 40 o C 32 o F to 104 o F 11 3 REAL TIME ANALYSER Spectrum analysis 31 band 1 3rd octave standard EN 61260 peak or VU Display mode dBu or dBSPL Range 20dB or 40dB So...

Page 46: ...46 11 0 SPECIFICATIONS 11 4 DIGITAL I O Format AES EBU and S P DIF Word size 24 bit Sample rate 44 1kHz 48kHz and 96kHz compatible Inputs Outputs AES EBU 3 pin XLR S P DIF phono Word clock input BNC ...

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