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DSPXmini-FM

Broadcast Audio Processor

Operational Manual

Version 1.2

www.audio-processor.com

Summary of Contents for DSPXmini-FM

Page 1: ...DSPXmini FM Broadcast Audio Processor Operational Manual Version 1 2 www audio processor com...

Page 2: ...udio processing 12 Source material quality 13 DSPXmini FM placement 13 The DSPXmini FM and its processing structure 14 Processing block diagram 15 The DSPXmini FM menu system 16 The Menu structure 16...

Page 3: ...Free inspections and maintenance repair work are expressly excluded from this warranty in particular if caused by improper handling of the product by the user This also applies to defects caused by n...

Page 4: ...ves or other appliance including amplifiers that produce heat Power Source The appliance should be connected to a power supply only of the type described in the operating instructions or as marked on...

Page 5: ...336 EEC electromagnetic compatibility Conformity is declared to those standards EN50081 1 EN50082 1 WARNING This equipment generates uses and can radiate radio frequency energy If not installed and us...

Page 6: ...r was the DSPX Why DSPX Like most products the concept is conceived nameless The name DSPX came about for several reasons Firstly the BW team couldn t decide on a name we liked so the concept became D...

Page 7: ...level control circuitry 6 x 24 bit DSP s an ethernet port a trigger port an RS232 port an LCD screen and memory devices to hold the software and firmware The Processing Architecture After input select...

Page 8: ...NEW PASSCODE 3779 U2 ROUND FACE U3 CLASSICAL 3 A SAVE PRESET UP GO U1 BASS FACE U2 ROUND FACE U3 CLASSICAL 3 A INS DEL DONE NAME PRESET U2 MY PRESET 3 UP LOAD SAVE DSPX OUTPUT PROCESS INPUT Analogue...

Page 9: ...PXmini FM are low and or com ing from unbalanced source you might want to set the jumpers for 12dBu operation You can check the levels going in DSPXmini FM at any time by bringing up the metering scre...

Page 10: ...tion of the multi band AGC The range shown is 21dB to 21dB in 3dB steps There is only one meter per stereo channel and the value shown is the largest gain reduction of the left and right channels Unde...

Page 11: ...INPUT menu Apply audio and observe the input meters 5 Select the pre emphasis setting for your region input menu 75uS for USA and 50uS for Europe 6 Navigate to the STEREO menu and adjust the MPX OUTPU...

Page 12: ...owed by limiting and then finally peak clipping Compression Compression reduces the dynamic range of the audio waveform slowly in a manner similar to a trained operator riding the gain Compression is...

Page 13: ...for audio storage If you must use compressed audio we advise rates of 256 Kbps and higher Linear formats are always to be preferred Compressed audio formats employ frequency masking data reduction te...

Page 14: ...ith a choice of 4 Q s This can be thought of as a simple bass parametric Xover The DSPXmini FM employs linear phase time aligned digital FIR filtering to split the audio spectrum into 4 bands while ma...

Page 15: ...DSPXmini FM operational manual V1 2 15 4 32 7 054 0 0 0 0 33 0 02 7 0 33 0 0 54054 08 0 4 54 08 0 0 0 4 3 08 54 308MINI 02 33 2 0...

Page 16: ...n the softkey functions are contained in the appropriate sections of this manual Menu Structure menu input INPUT SOURCE pre emphasis menu PROCESS menu enhance peaking bass GAIN peaking bass FREQ peaki...

Page 17: ...between 1 and 10 which corresponds to 100mS to 10S on a semi exponential scale DECAY Controls the release decay rate of the AGC the time the AGC takes to respond to a decrease of input level The DECA...

Page 18: ...N CLIPPER HARDNESS Another distortion controlling mechanism that helps to reduce IMD in the final clipper The range is 1 to 10 with 10 producing the least distortion control A setting of 10 effectivel...

Page 19: ...ock The options are enabled and disabled More information is available in the code lock section of this manual REMOTE SOURCE This selects the seria or the NET LAN port as the remote control method The...

Page 20: ...peak limiter stages Because of the RMS based level detectors the multi band AGC can re equalise the sound in a more natural manner than the peak limiter stages which use peak detectors As the human e...

Page 21: ...o illustrate things a little clearer The peak and average function can clearly be seen in the images Traditionally audio limiters have two time constants an attack the time is takes the limiter to res...

Page 22: ...eak circuit releases to The mixer The post limiters mixer in the DSPXmini FM is not strictly a mixer but a band output level control where small EQ changes can be made Be careful when making large EQ...

Page 23: ...range has been limited to restrict the amount of control preventing pumping and a loss of loudness which would undo what we want to use the clipper for which is gaining loudness You may not notice th...

Page 24: ...eed up the release times making them faster While it is possible to create a strange response in the multi band AGC it is hard to produce distortion because whatever gets through the AGC is dealt with...

Page 25: ...nd 1 and band 2 average attack time so that the peak time constant dominates the control signal providing faster control Bass clipper Increase the bass clip level WE SUGGEST ONLY SMALL MODIFICATIONS F...

Page 26: ...tortion controlled HF clipper WE SUGGEST ONLY SMALL MODIFICATIONS FROM FACTORY PRESET SETTINGS IF YOU ARE MODIFYING LOTS OF THE PARAMETERS IF YOU ARE ADJUSTING ONLY A COUPLE FROM THE ABOVE SUGGESTIONS...

Page 27: ...re happy with the name you press the DONE soft key to save the preset to the DSPXmini FM s memory For speed saving the current settings to the same active preset is as simple as pushing the same butto...

Page 28: ...BASS A preset for competitive stations who want loudness and more of a signature sound with lots of bass This presets packs a maximum amount of bass while still remaining loud F6 HOT Very loud presets...

Page 29: ...int in time so you will need to select which one of the two remote control methods you wish to use by selecting the appro priate option from the remote source parameter which is contained in the syste...

Page 30: ...AN port to control the DSPXmini FM follow the steps below 1 Connect a cat 5 cable to the RJ45 port on the DSPXmini FM and plug this into your network hub switch A Xover cable can be used to connect di...

Page 31: ...t of the application you have the menu preset toggle buttons These change the contents of the left hand window from the DSPXmini FM menu tree to the preset list The top right of the application contai...

Page 32: ...efault preset Unlikely but possible Various preset operations are possible including changing the default preset saving a preset to a user preset location changing the name as well as PC file operatio...

Page 33: ...arts Each has three parameters The left hand box contains the name of the preset that you want this daypart to switch to This box also has the ability to turn the daypart OFF by clicking down on the a...

Page 34: ...changes you have made to the processing against the saved preset When you load a preset the buttons should be greyed out but as soon as you make any processing changes these buttons will become active...

Page 35: ...ger pins When the trigger pins are connected to the earth return pin they will change the currently active preset to the user preset triggered by that pin If more than one pin is pulled low at the sam...

Page 36: ...entered with the use of the rotary encoder and the GO soft key can be pressed to confirm entry and proceed If unsuccessful you will be required to try again If successful the DSPXmini FM will allow yo...

Page 37: ...gers when the daypart start time matches the system clock You can also set the start time trigger of each daypart and set the length that the daypart shall be the time the trigger shall remain in forc...

Page 38: ...mono from left mono from right or mono from sum Sampling Rate 32 44 1 48 88 2 or 96 kHz automatically selected Connector XLR female Pin 1 chassis ground pins 2 and 3 transformer balanced and floating...

Page 39: ...19200 kbps Ethernet Port 10 Mbit sec on RJ45 female connector Remote Control trigger port DB9 opto isolated and floating Eight pull low inputs Other Voltage 100 240 VAC 50 60 Hz 35 VA Connector IEC De...

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