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Related Manuals for BW Broadcast DSPXmini-HD
Summary of Contents for BW Broadcast DSPXmini-HD
- Page 1 DSPXmini-HD Digital Audio Broadcast Processor Operational Manual Version 1.10 www.bwbroadcast.com...
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Page 2: Table Of Contents
The DSPXmini-HD and its processing structure The DSPXmini-HD processing block diagram The menu system The menu structure Processing parameters Setting up the processing on the DSPXmini-HD Getting the sound that you want Managing Presets Factory presets Remote control of the DSPXmini-HD... -
Page 3: Warranty
Any repair or opening of the unit carried out by unauthorized personnel (user included) will void the warranty. If an inspection of the product by BW Broadcast shows that the defect in question is not covered by the war- ranty, the inspection costs are payable by the customer. -
Page 4: Safety
afety nStructIonS CAUTION: To reduce the risk of electrical shock, do not remove the cover. No user serviceable parts inside. refer servicing to qualified personnel. WARNING: To reduce the risk of fire or electrical shock, do not expose this appliance to rain or moisture. This symbol, wherever it appears, alerts This symbol, wherever it appears, you to important operating and mainte-... - Page 5 Object and Liquid Entry: Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through open- ings. Damage Requiring Service: The appliance should be serviced by qualified service personnel when: - The power supply cord or the plug has been damaged; or - Objects have fallen, or liquid has been spilled into the appliance;...
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Page 6: Forward
Thank you for your purchase of the DSPXmini-HD digital audio broadcast processor. Over the last decade the staff at BW Broadcast have observed broadcast processors from afar with fascination and intrigue and shared a keen interest in digital audio processing. In January 00 we decided on a whim that it was time to have a go at designing our own digital audio processor. -
Page 7: Introduction To The Dspx Mini-Hd
The BW Broadcast DSPXmini-HD is a new generation of digital audio signal processor that can be used to proc- ess audio ready for digital broadcasting such as HD Radio, DAB or Internet streaming. Using the latest multi- band DSP technology the DSPXmini-HD offers a versatile and powerful tool in creating a loud punchy on-air presence. -
Page 8: Dspxmini-Hd Connections
Connections... -
Page 9: Dspxmini-Hd Metering And Status Leds
The output meters show a smaller dynamic range compared to the input ones. This reflects the smaller dynamic range of the audio once processed by the DSPXmini-HD. If we were to have used the same scale as the input ICAL 3 LOAD metering we would not see a lot of activity on the bars. -
Page 10: Quickstart
uIck Start 1. Install the processor into the rack. 2. Connect AC power to the unit and turn on the power. 3. Connect the analogue and / or digital audio inputs. 4. Select the analogue or digital input as the source of the processing with the 'INPUT SELECTION' parameter which can be found in the 'INPUT' menu. -
Page 11: An Introduction To Audio Processing
ntroductIon udIo roceSSIng Most audio processors use a combination of compression, limiting and clipping to 'funnel' the dynamic range down, reducing the peak to average ratio in each stage. A cascaded arrangement of compressor, limiter and clipper produces the best results. The first stage of processing usually operates in a slow manner, the process- ing getting progressively faster and more aggressive as the audio passes through the chain. -
Page 12: Source Material Quality, Lowpass Filtering And Output Levels
ILterIng The DSPXmini-HD has a built-in lowpass filter adjustable from kHz to 0kHz that limits the amount of high-end spectrum and energy delivered to the codec. Codecs are especially sensitive at higher frequencies, where most of the annoying artifacts like "metallic high-end", "phasing" or "squishing" occur. Reducing the amount of high- end puts less stress on the codec and can lower the amount of codec induced artifacts. -
Page 13: The Dspxmini-Hd And Its Processing Structure
Bass enhancement The DSPXmini-HD offers a bass enhancement via peaking filter that can be set to provide up to 6dB of gain on one of four frequencies with a choice of Q's. This can be thought of as a simple bass parametric. -
Page 14: The Dspxmini-Hd Processing Block Diagram
Block Diagram... -
Page 15: The Menu System
yStem vervIeW This section presents an overview of the four main menus and thier submenus and any parameters that are con- tained in them. INPUT: Contains all the controls that 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 control and signal conditioning. -
Page 16: The Menu Structure
tructure MENU: INPUT INPUT SOURCE ANALOG LEVEL MENU: PROCESS MENU: ENHANCE PEAKING BASS GAIN PEAKING BASS FREQ PEAKING BASS Q MENU: MULTI-BAND AGC MENUS: BANDS 1-4 DRIVE ATTACK DECAY GATE MENU: MULTI-BAND LIMITERS MASTER LIMITER DRIVE MENUS: BANDS 1-4 DRIVE LIMITER ATTACK LIMITER DECAY COMPRESSOR ATTACK... -
Page 17: Processing Parameters
For serial numbers less that 00 see 'DSPXmini-HD Jumper Settings'. This parameter allows you to set the analogue input level with reference to the DSPXmini-HD's A/D Converter. This would normally be set to +dBu if driving the DSPXmini-HD from professional audio equipment. When adjusting make sure that the input audio meters NEVER show clipping under any conditions. - Page 18 The 'SCHEDULE' menu contains all the controls for the dayparting (REAL TIME CLOCK) preset switch- ing. 'TIME' Sets the time and day of the DSPXmini-HD’s Real Time Clock. 'DAYPARTING ON/OFF: Enables or disables the scheduling. 'DP(X) ON/OFF' Enables or disables an individual daypart schedule.
- Page 19 'PORT' Sets the port number of the LAN port 'ABOUT' DSPXmini-HD version number and design credits. 'BOOTLOAD' This option is used to FLASH update the software and firmware inside the DSPXmini-HD. Further information on using this option is described in the documentation supplied with the upgrade.
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Page 20: Setting Up The Processing On The Dspxmini-Hd
This effect can be compensated somewhat by enhancing the bass prior to multi-band processing. The DSPXmini-HD has a pseudo parametric style bass equalizer control that allows you to sweet tune the bass. Four frequencies, amplitudes and Q's are provided giving you 6 different bass curves to select from. - Page 21 The multi-band limiters in the DSPXmini-HD are of the dual time constant variety. There is an attack and decay to handle the peaks and an attack and decay to handle the average level of limiting. Understanding how the two time constants interact is imperative if you want to make major changes to how each bands limiter reacts.
- Page 22 The mixer The post limiters mixer in the DSPXmini-HD is not strictly a mixer but a band output level control where small EQ changes can be made. Be careful when making large EQ changes at this stage because there is no peak control prior to the clipping system.
- Page 23 Auditioning individual stages of the DSPXmini-HD processing When setting up the DSPXmini-HD it is sometimes useful to hear the effects of the adjustments on that particu- lar processing stage. By setting the other processing blocks up in a certain way you can make it easier to hear the effects of the one you are adjusting.
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Page 24: Getting The Sound That You Want
While the DSPXmini-HD can help you obtain the sound that you want we must always take into account the limi- tations presented to us by the transmission channel. The biggest problem we have is the maximum peak level that can be handled by that transmission channel, and for digital broadcasting services that is 0 dBfs. - Page 25 Decrease the look-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 PROBABLY HAVE A BIT MORE LEE-WAY. IT IS VERY EASY TO LOSE YOUR WAY ONCE YOU START 'TWEAKING' LOTS OF DIFFERENT SETTINGS.
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Page 26: Managing Presets
PaneL controL The DSPXmini-HD has an assortment of factory presets and provision for 8 user ones. While the factory presets may not suit your tastes you will generally find one that serves as a good starting point in creating your own cus- tom preset. -
Page 27: Factory Presets
It is impossible to create presets that will suit every format and market. What is right for one market is not usually right for another. The staff at BW Broadcast will be able to help you refine your sound further if none of the factory presets meet your requirement. -
Page 28: Remote Control Of The Dspxmini-Hd
PC. The remote control program is available for download from www.bwbroadcast.com The DSPXmini-HD can only to talk to the serial system (RS) or the ethernet/LAN system at any point 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 system menu accessible from the DSPXmini-HD’s front panel. - Page 29 If you wish to use the NET/LAN port to control the DSPXmini-HD follow the steps below 1. Connect a cat cable to the RJ port on the DSPXmini-HD and plug this into your network hub/switch. A Xover cable can be used to connect directly to a PC if you don’t have a switch or hub.
- Page 30 Understanding the preset list The preset list contains all of the presets contained in the DSPXmini-HD. The user presets are prefixed U1 to U8 and the factory presets from F1 onwards. You may need to use the scroll arrows to view all of them as they won't all fit in the window at one time.
- Page 31 'on air'. The exception to this is when the default preset is being overridden by a daypart or remote trigger. In this case the DSPXmini-HD will 'on air' the selected preset when the daypart or trigger hands back control to the default preset.
- Page 32 This option will pop up the standard windows load dialog box. You can browse to and select a preset file to be loaded into the DSPXmini-HD. The preset location that is loaded is the currently highlighted (in blue) preset, not the one that is currently 'on-air' You can only load into a user preset.
- Page 33 by clicking down on the arrows until you reach the off option. If off is currently selected you can click up to rotate through the user and factory presets. The middle box contains the time and day that the daypart will start at. To select day, hour or minute click on the appropriate part of the box before using the up and down arrows.
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Page 34: Remote Trigger Port
MITERS OUTPUT HO LD DSPXtra REMOTE INPUT LOAD PROCESS AES/EBU OUTPUT SAVE EDIT emote rIgger The system menu contains the remote trigger port option from where it can be enabled or disabled. If enabled the remote trigger port on the processor allows you to select any of the first 8 user presets by pulling one of 8 pins on the trigger port socket low. -
Page 35: Security Code Lock
LOAD PRESET DSPXmini ENTER PASSCODE DSPXmini-HD will allow you to re-confirm the code or change it. This is where you may want to change the fac- U1=BASS FACE INPUT tory default code if you have not already done so. The soft keys will allow you to confirm the change or accept... -
Page 36: Clock Based Control
Lock aSed ontroL ayPartIng Your processor contains a battery backed up real time clock that can maintain the current time and date even when the power has been removed. This allows users to switch between presets at specific times of the day or week. -
Page 37: Specifications
PecIfIcatIonS Frequency Response (Bypass Mode): ±0.10 dB, .0 Hz - 0 kHz or as set with the low pass filter. Noise: Output noise floor will depend upon on the processor settings but is governed by the dynamic range of the A/D Converter. The dynamic range of the digital signal processing is 1 dB. Processing Sample Rate: 8 kHz - 768 kHz depending on processing stage. - Page 38 Other Voltage: 100–0 VAC, 0–60 Hz, VA. Connector: IEC. Detachable -wire power cord supplied. Grounding: Circuit ground is independent of chassis ground, and can be isolated or connected with a rear panel switch. Dimensions (W x H x D): mm x 8mm x 00mm. Specifications...
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Page 39: Preset Sheet
DSPXmini-HD v1.10 preset sheet Preset 1 Preset 2 Preset 3 Preset 4 Based on factory preset: INPUT SOURCE ANALOG LEVEL PROCESS ENHANCE BASS PEAK GAIN BASS PEAK FREQ BASS PEAK Q MB AGC BAND 1 DRIVE ATTACK DECAY GATE BAND ... - Page 40 LP FILTER DRIVE OUTPUT LEVEL Preset Sheet...
- Page 41 www.bwbroadcast.com...
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