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Lectrosonics DSP4/4, Operating Instructions And Troubleshooting Manual

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Lectrosonics DSP4/4 Operating Instructions And Troubleshooting Manual Download Page 14

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All filters (with the exception of the ADFE Notch) have adjustable frequencies from 20Hz to 20kHz.  For filters which
support adjustable bandwidth, the bandwidth adjustment range is .05 octaves to 2.55 octaves.  Filters which support
adjustable boost/cut have an adjustment range of +/-15dB.

Frequency

 - Allows the filter frequency to be adjusted.  For frequencies less than 200Hz, the Up and Down buttons

increment or decrement the filter frequency by 5Hz.  For frequencies between 200Hz and 2kHz, the increment value
is 20Hz.  For frequencies above 2kHz, the increment is 100Hz.

Short Cuts:

 A left mouse click on the frequency label will set the filter frequency to 100Hz.  A center mouse click (for

those with a 3 button mouse) will set the frequency to 1kHz, and a right mouse click will set the frequency to 10kHz.

Bandwidth

 - Allows the filter bandwidth to be adjusted, on those filter types which support bandwidth adjustment.

Adjustment range is from .05 octaves to 2.55 octaves in .01 octave steps.

Live Update on Freq/BW

 - Sets the filter update mode.  When checked, the frequency response graph will be

updated at each frequency or bandwidth step while the Up or Down buttons are held.  This provides conntinuous
feedback about the effect of the parameter change on the filter response, but is rather slow since many calculations
must be made at each iteration.  A faster alternative is to leave the box unchecked.  Under this circumstance, the
frequency response graph will only be updated when the Up or Down buttons are released.

Boost/Cut Gain Label

 - Indicates the value in dB of filter boost or cut.  Click this label to make one of the twelve

filters the active filter so that it may be adjusted.  The active filter label will have a yellow background, while inactive
filters will have a white background.  When a filter type is selected for a given filter, the frequency label (F1 - F12) will
change to one of the following (depending, of course, on the selected filter type):

1st Order Lowpass - LP6
1st Order Highpass - HP6
2nd Order Lowpass - LP12
2nd Order Bandpass - BP12
2nd Order Highpass - HP12
1st Order Shelving Bass - SB6
1st Order Shelving Treble - ST6
2nd Order Shelving Bass - SB12
2nd Order Shelving Treble - ST12
Parametric - P
ADFE Notch - ADFE

Short Cut:

 An ADFE notch filter can be reset by right clicking the Boost/Cut gain label associated with the filter.

Some care should be exercised when resetting an ADFE notch, since feedback could occur as a result.

Boost/Cut Scroll Bars

 - Allow adjustment of boost/cut gain in filters which support adjustable gain.  Gain adjustment

range is -15dB to +15dB.

Frequency Response Frame:

Frequency Response Graph

 - Shows either the frequency response of the active filter or the composite response

of all filters.

Show Response For Radio Buttons

 - Selects the display mode of the Frequency Response graph.  Current Filter

shows only the response of the active filter, while All Filters shows the composite response of all filters together.
Note that when you have a live connection to a DSP4/4, the ADFE notch filter responses will automatically be shown
as they are deployed by the system.

Y Axis Range

 - Changes the Y axis scale from +/-15dB to +/-30dB.

Summary of Contents for DSP4/4

Page 1: ...DSP4 4 4 In 4 Out Digital Audio Processor DSP4 4 DUAL Dual 4 In 4 Out Digital Audio Processor LECTROSONICS INC Rio Rancho NM www lectrosonics com OPERATING INSTRUCTIONS and trouble shooting guide ...

Page 2: ...tem applications 8 nonvolatile preset memory positions mean complete flexibility and reconfigurability Individual level control is provided on each input with gain adjustable in 1 dB steps from 40 to 20 dB A complete 4 x 4 matrix follows allowing crosspoint gain to be adjusted in 1 dB steps from 20 to 10 dB Each output also includes gain adjust ment in 1 dB steps from 40 to 20 dB with up to 12 sig...

Page 3: ...int gains Each of the four matrix outputs has a complement of 12 user adjustable filters a full function compressor a limiter audio delay and individual output gain control 13 programmable pin connections on the rear panel allow control of a variety of functions on the DSP4 4 Set up as inputs external pots or switches can be connected to provide input and output muting and or level control or used...

Page 4: ...able input must be set to either Analog In Control or Analog Out Control See the Programmable I O tab for setting all programmable input parameters DSP4 4 Programmable Outputs The DSP4 4 has 8 programmable outputs which can indicate the current state of a programmable input Each programmable output is the electrical equivalent of a contact closure to ground When a programmable output is active it ...

Page 5: ...13 programmable inputs can utilize either continuous DC voltages 0VDC 5VDC or contact closures depending on the particular function chosen For continuous voltages either 10K ohm linear pot or an adjustable DC control voltage may be used The volume control action is internally scaled in software to provide an audio taper characteristic to a linear pot When using a DC control voltage the control con...

Page 6: ...unit DIFFERENCES BETWEEN THE DSP4 4 AND THE DSP4 4 Dual The DSP4 4 Dual is simply two DSP4 4s in one box sharing a common power supply Audio inputs and outputs are labeled 1A through 4A on one unit and and 1B through 4B on the other unit There are no internal bus connections between the A and B units Each unit operates as an independent device with a unique serial address The follow ing outlines t...

Page 7: ...ments which can be made from the rear panel programmable inputs The rear panel gain control is attenuation only starting at a maximum gain of 0dB The rear panel input gain controls may be limited in their adjustment range using the Input Gain tab on the DSP4 4 control panel In addition you may set a rear panel preset gain value that will be applied to any inputs which are being controlled by a pro...

Page 8: ...tputs using the ADFE On Off radio buttons 13 Save the active state of the DSP4 4 to preset 1 the power up default to preserve the frequencies of the ADFE filters using the Save Active Setup to DSP4 4 Preset File menu option The compressor may be set up using the Compressor tab Compression can be used to restrict the dynamic range of the audio source without crushing the life out of it Several opti...

Page 9: ...ong and are stored in nonvolatile memory in the DSP4 4 In addition the names are stored in any disk files generated with any of the save to disk options above Inputs or outputs with no assigned names are listed as No Name To change a name simply click on the desired text box and enter the desired name While you are permitted to enter more than 15 characters in the text box only the first 15 will b...

Page 10: ...placed in the LecNet directory default c lecnet If new DSP software is downloaded from the Web site the file should be placed in the LecNet directory Anytime the DSP4 4 Control Panel is run it will check for cnv DSP software files which are more recent than the DSP software revision in the DSP4 4 You will be alerted that the DSP4 4 s DSP software can be updated and you can select whether or not to...

Page 11: ...l of input gain using the programmable inputs The Gain Preset scroll bar sets the power up attenuation applied to all inputs controlled by the Increment Input 1dB or Decrement Input 1dB programmable input function This attenuation will be added to the individual input gains to derive the actual input gain value The maximum adjustment range of the rear panel input control goes from 0dB to 30dB in 1...

Page 12: ...ll turn yellow and the Crosspoint Gain frame in the lower left hand portion of the Matrix tab will be enabled At this point the current crosspoint gain is shown Choose a new gain by clicking on the desired crosspoint gain value If you decide not to change the crosspoint gain you may click on the crosspoint box again to disable the Crosspoint Gain frame without changing the crosspoint gain Short Cu...

Page 13: ...e filter function to associate with the active filter the active filter is the one whose Boost Cut gain label has a yellow background The following filter types are available 1st Order Low Pass 6dB octave low pass filter with adjustable corner frequency 1st Order High Pass 6dB octave high pass filter with adjustable corner frequency 2nd Order Low Pass 12dB octave low pass filter with adjustable co...

Page 14: ...hen the Up or Down buttons are released Boost Cut Gain Label Indicates the value in dB of filter boost or cut Click this label to make one of the twelve filters the active filter so that it may be adjusted The active filter label will have a yellow background while inactive filters will have a white background When a filter type is selected for a given filter the frequency label F1 F12 will change...

Page 15: ... above threshold Gain Reduction Meter Shows the instantaneous amount of gain reduction being applied by the compressor to the audio signal Compressor gain reduction is limited to 25dB maximum irrespective of the signal level and threshold Limiter Tab The Limiter Setup tab allows the setting of the limiterr parameters These parameters include attack time release time and threshold The compression r...

Page 16: ... sions between audio delay time and distance Audio Delay Scroll Bar Allows the audio delay to be set within the range of 0mS to 182 625mS Time increment size is 20 83uS The equivalent distance in both feet and meters is also given Time Distance Calculator Converts between Milliseconds Feet and Meters Fill in any one of the text boxes and press the Calculate button ...

Page 17: ... the rear panel output control goes from 0dB to 30dB in 1dB steps plus Off The Min Gain scroll bar allows the gain adjustment range below 0dB to be limited as needed for the application Off signifies no lower gain limit 0dB is the maximum value available for Min Gain and is equivalent to making rear panel output control inactive The Min Gain value also applies to outputs being controlled by the An...

Page 18: ...h programmable I O is currently being changed Push Input Button Allows a contact closure to be simulated for the current programmable input This is useful when testing to see that the changes you ve made to each programmable input indeed have the intended effect Each click on the Push Input button has the same effect as a momentary contact closure on the current program mable input Note that the c...

Page 19: ...o contact closure on prog input Analog Out LED ON Analog Out attenuation 15dB LED OFF Analog Out attenuation 15dB Increase Out 1dB LED ON Contact closure on prog input LED OFF No contact closure on prog input Decrease Out 1dB LED ON Contact closure on prog input LED OFF No contact closure on prog input Preset Recall LED ON Associated memory is active LED OFF Associated memory is not active Mute In...

Page 20: ...e function of programmable I O number 1 is set to provide an analog input control of inputs 1 2 and 4 Notice how multiple inputs may be controlled by a single programmable input Increase In 1dB Decrease In 1dB Allows one or more input gains to be controlled by a contact closure on a programmable input pin Increase and Decrease input gain control goes from a maximum of 0dB gain to a minimum of 30dB...

Page 21: ...ble input to ground GND pin The screen shown here indicates that the function of programmable input 1 is analog output control of outputs 1 and 3 simultaneously Increase Out 1dB Decrease Out 1dB Allows one or more output gains to be controlled by a contact closure on a programmable input pin Increase and Decrease output gain control goes from a maximum of 0dB gain to a mini mum of 30dB attenuation...

Page 22: ...grammable inputs for memory recall you will want to set up and apply all programmable input memory preset association and download the active setup to all preset memories you ll be using This guaran tees that the desired programmable input memory preset associations are stored in all memories of interest The screen shows that the function of programmable I O 1 is to recall Memory Preset 2 ...

Page 23: ...ity of I O 1 will vary according to the function and state of I O 4 Prog input function Activity of Associated Programmable Output Analog In Active Analog In attenuation 15dB Inactive Analog In attenuation 15dB Increase In 1dB Active Contact closure on prog input Inactive No contact closure on prog input Decrease In 1dB Active Contact closure on prog input Inactive No contact closure on prog input...

Page 24: ...o 2 Way Crossover Filter Setup Now that the signal flow is established step two is to apply filtering to each path to get the low frequency and high frequency portions of the crossover The Filter Setup tabs for outputs 1 and 2 i e left channel low and left channel high will be shown The right channel Filter Setup tabs are identical except they use outputs 3 and 4 Since a 4th order Linkwitz Riley c...

Page 25: ... to send one input to three or four outputs respectively The band pass sections of these crossovers would be implemented using two LP12 user adjustable filters for the high frequency corner and two HP12 user adjustable filters for the low frequency corner An example filter setup is shown to the right for a band pass section with a low frequency corner of 150Hz and a high frequency corner of 2kHz T...

Page 26: ... most productive way to control LecNet devices with an AMX system Wiring Diagram 9 Pin D Sub LecNet Device to PC 3 5MM Stereo Plug 9 or 25 Pin Female D Subminiature S R T 1 2 3 4 5 6 7 8 9 LecNet Port LecNet Device Transmit LecNet Device Receive Gnd Tip Ring Sleeve Host Serial Port PC N C N C Wiring Diagram 25 Pin D Sub LecNet Port LecNet Device Transmit LecNet Device Receive Gnd Tip Ring Sleeve 3...

Page 27: ...ess of the device to be controlled If a device with the requested address exists on the system it will respond by sending a 0 back to the host Each interchange with an DSP4 4 follows this pattern 1 Host sends device address 1 byte 2 Host receives byte of 0 from DSP4 4 as acknowledgement 3 Host sends command 1 byte to DSP4 4 4 Host and DSP4 4 interact based on particular command sent The following ...

Page 28: ...s For example the lowest bit of the mask represents input 1 the next lowest bit input 2 and so on A 1 in a bit position will apply the gain in byte 2 to the associated channel while a 0 in a bit position will not apply the gain to the associated channel Byte 2 Input gain value 0 78 which represents 10dB to 68dB 79 for off 80 to increment the current gain by 1dB 81 to decrement the current gain by ...

Page 29: ...e this command is used Host sends command 122 7A hex Host sends 1 byte Programmable input to trigger 1 13 Host receives 1 byte 0D hex to acknowledge the simulated push Get Programmable I O Current State Gets the current state of one of the 13 programmable inputs or 8 program mable outputs Returns a 1 or a 2 where 2 means the programmable i o is active and 1 means it is inactive Host sends command ...

Page 30: ...he meter is dancing but you still don t have any sound Check the Matrix Setup tab to be sure that the input is actually assigned to the desired output s 3 The matrix is just where it ought to be but by golly you still don t hear anything Look at the Output Gain tab Again if the Gain box has a red background it means the output has been muted This is only possible from the programmable inputs If yo...

Page 31: ...able Input Range 0VDC 5VDC Analog Control 0dB to 30dB plus off control range 156mV dB control sensitivity Logic Control Active Low Programmable Output Active low Max sink current 100 mA Max supply voltage 40VDC Serial Communication Default LecNet Address DSP4 4 143 DSP4 4 Dual 143 144 Serial Comm Parameters RS 232 9600 baud 8 data bits no parity 1 stop bit System Overall Latency 3 ms System THD Le...

Page 32: ...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...

Page 33: ...Standards EN55022 and EN50082 1 1998 A copy of the Declaration of Conformity may be requested from your dealer or by contacting the factory directly Lectrosonics Inc Marketing Department 581 Laser Rd NE Rio Rancho NM 87124 USA tel 505 892 4501 fax 505 892 6243 e mail marketing lectrosonics com ...

Page 34: ...eturning your equipment to you This warranty applies only to items returned to Lectrosonics Inc or an authorized dealer shipping costs prepaid within one year from the date of purchase This Limited Warranty is governed by the laws of the State of New Mexico It states the entire liablility of Lectrosonics Inc and the entire remedy of the purchaser for any breach of warranty as outlined above NEITHE...

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