DC1
AUTOMATIC PRE-PROCESSOR
WITH ADAPTIVE PROPORTIONAL GAIN ALGORITHM*
(Version 2.0 and higher)
OPERATING INSTRUCTIONS
LECTROSONICS, INC.
Rio Rancho, NM
* US Patent Pending
Страница 1: ...DC1 AUTOMATIC PRE PROCESSOR WITH ADAPTIVE PROPORTIONAL GAIN ALGORITHM Version 2 0 and higher OPERATING INSTRUCTIONS LECTROSONICS INC Rio Rancho NM US Patent Pending ...
Страница 2: ...ather than hard switching to turn channels off and on This results in totally inaudible automatic action Complete control over all operational parameters is afforded by the DC1 The actual automatic mixing algorithm is implemented in software and as a result much greater control and flexibility may be exercised than would normally be the case in a purely analog system TABLE OF CONTENTS INTRODUCTION...
Страница 3: ...ENUATION DISPLAY HEADROOM DISPLAY PHANTOM POWER PROGRAMMABLE MICROPHONE PREAMP VOLTAGE CONTROLLED AMPLIFIER VCA RELAY BYPASS PROGRAMMABLE ATTENUATOR SPEECH FILTER LOG CONVERTER PRE VCA OUTPUT POST VCA OUTPUT 11 CHANNEL A D CONVERTER 8 CHANNEL D A CONVERTER NON VOLATILE MEMORY uPROCESSOR MC68HC705 PRE VCA OUT POST VCA OUT NOM OUT VAR THRESHOLD NOM TOTAL EXT PRIORITY GND PRE VCA IN POST VCA IN NOM I...
Страница 4: ...ptimize the performance for any application Each channel has two modes of operation Auto and Direct Auto mode sets the channel for automatic operation Direct turns the channel on under all circumstances Level Match allows the apparent channel signal level to be increased or decreased by up to 30dB in 1dB increments The actual audio signal path gain is unaffected by changes in the Level Match value...
Страница 5: ... set to the slave mode Slave mode strapping is accomplished by removing the top cover of the DC1 and moving the two jumpers in the upper right hand corner of the DC1 from the forward position i e toward the front panel to the rear position i e toward the rear panel In addition the DC1 s should be connected using 9 pin subminiature D type cables as shown in Figure 3 Master Slave Figure 2 DC1 Jumper...
Страница 6: ...be made to DC1 settings In the Bypass mode the Operate LED flashes If the Mode button is pressed and held while the DC1 is powered up the DC1 will enter a setup mode whereby the input signal level of each channel will be displayed in real time From this screen access may be gained to the AUTOSET function UP and DOWN PUSHBUTTONS Allows the DC1 to be cycled through its function options as well as en...
Страница 7: ...mote triggering of programmed settings CH ON Terminal connectors for individual channel overrides LOGIC Terminal connectors for signals indicating channel activity Allows connection to logic controlled devices for speaker zoning automated video switching etc LECTROSONICS INC CAUTION TO REDUCE THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE 1 4 AMP 250 VOLT FUSE 100 120V AC 50 60 HZ 30 WATTS WARNING T...
Страница 8: ...noise Fast Med and Slow note the asterisks These three settings will release the Auto Gain Skew if the DC1 determines that there is only noise present on all channels and no valid speech signal MAX ATTENUATION The Max Attenuation adjustment allows the maximum attenuation of each channel to be optimized for both the total number of microphones in use and the specific acoustic situation The range of...
Страница 9: ...he current memory preset 3 Set phantom power for any microphones that require it This is accomplished by pressing the UP or DOWN button until Phantom Power appears on the first line of the LCD display The SELECT button is then pressed to move the blinking cursor to the Channel position on the second line of the LCD display The UP or DOWN buttons are again pressed until the desired channel number i...
Страница 10: ...on 33 or more total microphones requires 20dB of attenuation The exact amount of attenuation necessary may be calculated as 10 Log10 Number of Microphones dB More attenuation than the minimum may be used if desired for the particular application No ill effects occur if less than the recommended off attenuation is used Repeat for all channels 9 Select the Auto Gain Skew value or OFF if Auto Gain Sk...
Страница 11: ...at the Level Match Adjust values generated by the AUTOSET procedure should be changed the information displayed on the Level dB screen can help the user to determine the amount of change necessary AUTOSET Screen The AUTOSET screen enables the user to initiate the AUTOSET procedure for each channel The appropriate Input Type can be chosen for each channel before AUTOSET is performed Also the AUTOSE...
Страница 12: ... routine has been run the Input Type should not be changed If the Input Type is changed for any reason the AUTOSET routine must be run again 6 Initiate the sampling and automatic level match action With the noise or voice signal still being fed into CH 1 press the MODE switch to activate the AUTOSET routine See Figure 20 As the signal is sampled and evaluated the NEW SETTING and OPERATE LEDs will ...
Страница 13: ...el 1 DIRECT AUTO AUTO Channel 2 AUTO AUTO Channel 3 AUTO AUTO Channel 4 AUTO AUTO Level Match 30dB to 30dB Channel 1 in 1dB increments 0dB 0dB Channel 2 0dB 0dB Channel 3 0dB 0dB Channel 4 0dB 0db Max Attenuation 6dB to 20dB Channel 1 in 1dB increments 20dB 20dB Channel 2 20dB 20dB Channel 3 20dB 20dB Channel 4 20dB 20dB Auto Gain Skew One setting affects all channels OFF SLOW MED FAST SLOW MED FA...
Страница 14: ...125dBu at Low Gain Maximum Input Level 20dBu for High Input Type 40dBu for Low Input Type Mic Output Impedance Less than 15 Ohms Type Transformer balanced Maximum Output Level 20dBu at Low Gain 40dBu at High Gain Phantom Power 48 Volts System THD 20 20kHz Less than 0 1 System IMD 60Hz 7kHz Less than 0 1 Power Consumption 30 Watts at 120VAC 13 ...
Страница 15: ...n exact quotation We will be happy to quote approximate charges by phone for out of warranty repairs RETURNING UNITS FOR REPAIR You will save yourself time and trouble if you will follow the steps below A DO NOT return equipment to the factory for repair without first contacting us by letter or by phone We need to know the nature of the problem the model number and the serial number of the equipme...
Страница 16: ...evelop we will at our option repair or replace any defective parts without charge for either parts or labor If we cannot correct the defect in your equipment we will replace it at no charge with a similar new item We will pay for the cost of returning your merchandise to you This warranty applies only to items returned to us shipping costs prepaid within one year from the date of purchase This war...
