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DSPXmini-HD

Digital Audio Broadcast Processor

Operational Manual

Version 1.10

www.bwbroadcast.com

Содержание DSPXmini-HD

Страница 1: ...DSPXmini HD Digital Audio Broadcast Processor Operational Manual Version 1 10 www bwbroadcast com...

Страница 2: ...lowpass filtering and output levels 12 The DSPXmini HD and its processing structure 13 The DSPXmini HD processing block diagram 14 The menu system 15 The menu structure 16 Processing parameters 17 Se...

Страница 3: ...aintenance 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 normal wear and tear in...

Страница 4: ...r 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 the applian...

Страница 5: ...ectromagnetic 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 used in acco...

Страница 6: ...we liked so the concept became DSP processor X As the project developed it soon became clear that the processor was to be a processor for all seasons and so in true algebraic fashion X represents many...

Страница 7: ...nd digital circuits These include 24 bit A D and D A converters analogue 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...

Страница 8: ...ACE 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 DSPXmini OUTPUT PROCESS INPUT D S P X m i n i H D Analogue input...

Страница 9: ...e value shown is the largest gain reduction of the left and right channels Under normal operation with a stereo audio feed this is fine but you may observe strange metering if the channels are not ver...

Страница 10: ...s For analogue inputs adjust the INPUT menus INPUT LEVEL CONTROL so that the input meters do not clip We recommend setting the mixing board or audio source to full level output even clipping prior to...

Страница 11: ...med on the RMS level of the audio waveform and the ratio of compression is usually adjustable Compression is usually gated to prevent gain riding and suck up of noise during silence or quiet periods L...

Страница 12: ...Reducing the amount of high end puts less stress on the codec and can lower the amount of codec induced artifacts The actual setting will depend on the type of codec and the bitrate used Lower bitrate...

Страница 13: ...set to provide up to 6dB of gain on one of four frequencies with a choice of 4 Q s This can be thought of as a simple bass parametric Xover The DSPXmini HD employs linear phase time aligned digital FI...

Страница 14: ...BLOCK DIAGRAM ANALOG DIGITAL A D SRC LOW AGC MID1 AGC HIGH AGC INPUT MB AGC LPF BPF BPF HPF BASS PEAK MID2 AGC LOW LIM MID1 LIM HIGH LIM MB LIM MID2 LIM OUTPUT DIGITAL SRC ANALOG D A SYNC N 1 DELAY AT...

Страница 15: ...hat affect input selection level control and signal conditioning PROCESS Contains all the controls that affect the processing OUTPUT Contains all the controls that affect output selection level contro...

Страница 16: ...vel BAND 2 MIX level BAND 3 MIX level BAND 4 MIX level menu LOOK AHEAD BASS CLIP LEVEL LP FILTER DRIVE menu OUTPUT LEVEL menu SCHEDULE X REPRESENTS 0 7 TIME DAYPARTING ON OFF TIME CALIBRATION DAYPARTS...

Страница 17: ...eduction of 0dB the mid way point The drive can be increased or decreased by up to 12dB You may need to increase the drive a little as you go up through the bands to compensate for the fact that music...

Страница 18: ...d LP FILTER A high frequency filter adjustable over a range of 4 20 kHz This control can be used to tame the artifacts of subsequent perceptal coding especially when used with very low bitrates DRIVE...

Страница 19: ...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 default option is Off The LAN CONFIG menu contains the co...

Страница 20: ...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 ear wo...

Страница 21: ...ustrate 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 respond...

Страница 22: ...control and defines the position of the platform that the peak circuit releases to The mixer The post limiters mixer in the DSPXmini HD is not strictly a mixer but a band output level control where sm...

Страница 23: ...nergy from the audio area that codecs are most sensitive to As a general rule the filter should be set at or below half smapling freqeuncy of the following codec In any case you should experiment with...

Страница 24: ...the bands Speed 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 i...

Страница 25: ...ahead limiter drive WE SUGGEST ONLY SMALL MODIFICATIONS FROM FACTORY PRESET SETTINGS IF YOU ARE MODYFYING LOTS OF THE PARAMETERS IF YOU ARE ADJUSTING ONLY A COUPLE FROM THE ABOVE SUGGESTIONS THEN YOU...

Страница 26: ...e you press the DONE soft key to save the preset to the DSPXmini HD s memory For speed saving the current settings to the same active preset is as simple as pushing the same button three times as SAVE...

Страница 27: ...o are looking loudness above all Has a nice bottom slam but can sound squashed and fatiguing on prolonged listening F6 EASY LISNIN A nicely flowing preset for easy listening music Your female audience...

Страница 28: ...are new versions of DSPXmini HD code will also need to be uploaded into the DSPXmini HD via the serial port system The BW Broadcast development team have built the serial communications XMODEM pro toc...

Страница 29: ...rther information on the remote application is contained on the following pages If the DSPXmini HD remote application does not connect or disconnects after a few seconds then it could be that the pass...

Страница 30: ...should then see the menu tree in the left hand window see above image You can now navigate through the menu tree and see the controls that are contained in that menu appear in the main controls windo...

Страница 31: ...in the list This will highlight the preset with a blue bar This does not change the preset or affect anything on the air All this blue selection bar indicates if that this is the preset that we want...

Страница 32: ...lot of explanation The scheduling screens that controls the dayparting may appear daunting so we are going to give you a quick guide to using it There are three menu locations for controlling schedul...

Страница 33: ...00 05 00 factory preset 2 to run from 12pm everyday for 5 hours We could instead setup the dayparts as DPO F2 CHR ALL 07 00 10 00 factory preset 2 to run from 7am everyday for 10 hours DP1 U4 NEW PRE...

Страница 34: ...e 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 same time the pin with the lowest nu...

Страница 35: ...and set the code lock option to disa bled Confirm the current password Changing the lock codes Once locked the DSPXmini HD will not allow processing adjustments or access to the output menu The lock c...

Страница 36: ...and with the same control set the preset to switch to when the daypart triggers when the daypart start time matches the system clock You can also set the start time trigger of each daypart and set the...

Страница 37: ...ble Signal to Noise 90 dB unweighted Bypass mode de emphasised 20 Hz 15 kHz bandwidth refer enced to 100 modulation L R Crosstalk 70 dB 20 Hz 20 kHz Distortion 0 01 THD Bypass preset 20 Hz 20 kHz band...

Страница 38: ...0 240 VAC 50 60 Hz 35 VA Connector IEC Detachable 3 wire power cord supplied Grounding Circuit ground is independent of chassis ground and can be isolated or connected with a rear panel switch Dimensi...

Страница 39: ...dB dB BAND DRIVE dB dB dB dB ATTACK DECAY GATE dB dB dB dB MB LIMITER MASTER DRIVE dB dB dB dB BAND 1 DRIVE dB dB dB dB PEAK ATTACK PEAK DECAY AVERAGE ATTACK AVERAGE DECAY BAND DRIVE dB dB dB dB PEAK...

Страница 40: ...Preset Sheet 40 LP FILTER kHz kHz kHz kHz DRIVE dB dB dB dB OUTPUT LEVEL...

Страница 41: ...www bwbroadcast com...

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