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TABLE OF CONTENTS

INTRODUCTION ..............................................................1

SAFETY INSTRUCTIONS ................................................2

SETUP ..............................................................................3

AUDIO CONNECTIONS AND INDICATORS....................4

FRONT-PANEL INDICATORS AND CONTROLS ..............5

OPERATING THE DNS1000 ............................................7

CASE STUDIES ................................................................9

Case 1: Traffic noise and other ambient sound ..................9

Case 2: Tape hiss ..............................................................11

Case 3: Excessive reverberation ......................................12

SPECIFICATIONS ..........................................................13

EMC REGULATIONS......................................................13

LICENCE AND LIMITED WARRANTY ............................14

Summary of Contents for DNS1000

Page 1: ...CEDAR DNS1000 dynamic noise suppressor OWNER S MANUAL 2000 CEDAR Audio Ltd Manual version 1 00 August 2000 ...

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Page 3: ...NNECTIONS AND INDICATORS 4 FRONT PANEL INDICATORS AND CONTROLS 5 OPERATING THE DNS1000 7 CASE STUDIES 9 Case 1 Traffic noise and other ambient sound 9 Case 2 Tape hiss 11 Case 3 Excessive reverberation 12 SPECIFICATIONS 13 EMC REGULATIONS 13 LICENCE AND LIMITED WARRANTY 14 ...

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Page 5: ...lity The DNS1000 will handle a wide range of noise suppression requirements Speed and ease of use The DNS1000 offers a carefully designed control surface that maximises operator comfort and speed of use Audio interfaces The DNS1000 incorporates a 24 bit digital audio interface conforming to both AES EBU and SPDIF standards Power requirements Its universal power supply means that a DNS1000 will wor...

Page 6: ...p but should be installed away from heat sources such as radiators and audio devices that produce large amounts of heat Power sources The DNS1000 features a universal power supply that will work safely on any mains supply in the range 85V to 260V 50Hz or 60Hz AC only The unit should always be grounded earthed and you should route power cables so that they will not be walked on or pinched Connectio...

Page 7: ...nvironmental considerations the temperature should be maintained between 5 and 30 Celsius relative humidity should be in the range 30 to 80 non condensing strong magnetic fields should not exist nearby Brightness control You can adjust the brightness of the front panel indicators buttons and Activity LEDs to suit local lighting conditions with power OFF press and hold Bypass continue to hold Bypas...

Page 8: ...ple rate is 44 1kHz If the 48 LED is lit the input sample rate is 48kHz If both LEDs are lit the input sample rate is 32kHz If one or both LEDs are flashing the DNS1000 is receiving a signal that is close to but outside the industry tolerances for that sample rate The unit will operate correctly but with the filterbank frequencies scaled by a corresponding amount Input LEDs If the AES LED is lit t...

Page 9: ...vity into the desired part of the audio spectrum Level control The Level control tells the DNS1000 how much noise is present in the input Band Gain controls The Band Gain controls determine the maximum amount of processing that the DNS1000 will apply in each band Activity LEDs These offer a visual indication of the activity in each of the Bands Bypass This control allows you to monitor the process...

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Page 11: ...only Press the STEREO button if you wish to process both channels In Stereo mode the DNS1000 processes both channels equally according to the positions of the front panel controls Range Selector Next you should identify the frequency range or ranges in which the noise lies You can press each of the Range Selector buttons individually or combine them to choose any one of six possible processing ran...

Page 12: ...ight across the selected range You will use the Band Gain controls to control the amount of noise attenuation performed in each band adjusting them to suppress as much noise as possible without introducing unwanted artefacts into the desired signal Noise suppression occurs in a given band when the fader is below the 0dB line However there are occasions when you might wish to boost the signal in a ...

Page 13: ...ings once you have found the correct range Begin as follows Select the correct channel s Ensure that the DNS1000 is not in Bypass Select Full Range Set all six Band Gain controls to 24dB Raise the Level control until the noise disappears At this point you have determined an approximate setting for the Level This is necessary for determining the range but it is likely that you will refine this late...

Page 14: ...in controls to 24dB for this stage The DNS1000 takes a short period to settle after moving the Level control especially in the lower ranges so you should not adjust it rapidly Third refine the Band Gain controls for optimum suppression Set all six Band Gain controls to 0dB Now increase and decrease the Gain in each band separately while listening to the effect that each has on the noise This will ...

Page 15: ... Second optimise the Level control To determine the correct Level you should again follow the procedure described in case 1 Third refine the Band Gain controls for optimum suppression As in case 1 you should start with all six Band Gain controls at 0dB You should then increase and decrease each control individually to find the bands that contribute most hiss to the signal Because tape hiss often e...

Page 16: ...le and lower frequencies Even bare rooms with hard walls include these materials they are the actors Consequently you will find that Low Mid is almost always the most appropriate combination of ranges for suppressing reverberation Second set the Band Gain controls You should set all six Band Gain controls to 24dB This will ensure that provided the other controls are set correctly the DNS1000 proce...

Page 17: ...cable suitable for digital audio Declaration of conformity Date of issue 1 October 2000 Equipment CEDAR DNS1000 Manufacturer CEDAR Audio Ltd Address 20 Home End Fulbourn Cambridge CB1 5BS UK This is to certify that the aforementioned equipment when used in accordance with the instructions in this manual fully conforms to the protection requirements of the following EC Council Directives on the app...

Page 18: ...n of its accompanying product manual for a period of one year from the date of supply to the Company s immediate customers 4 2 The Company will make good at its own expenses by repair or replacement any defect or failure that develops in the System within one year of supply to the Company s immediate customer 4 3 The Company shall have no liability to remedy any defect failure error or malfunction...

Page 19: ...iod or b repair or replacement of those components of the System that do not meet the warranties contained within this Document The foregoing states the entire liability of the Company to the Licensee 10 CONSEQUENTIAL LOSS Even if the Company has been advised of the possibility of such damages and notwithstanding anything else contained herein the Company shall under no event be liable to the Lice...

Page 20: ...CEDAR DNS1000 Designed and manufactured by CEDAR Audio Ltd 20 Home End Fulbourn Cambridge CB1 5BS United Kingdom www cedaraudio com info cedaraudio com Serial number Inspected QC Engineer ...

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