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Related Manuals for BW Broadcast DSPXmini-AM
Summary of Contents for BW Broadcast DSPXmini-AM
- Page 1 DSPXmini-AM Broadcast Audio Processor Operational Manual Version 1.01 www.bwbroadcast.com...
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Page 2: Table Of Contents
The DSPXmini-AM and its processing structure Processing block diagram The DSPXmini-AM menu system The menu structure Processing Parameters Setting up the processing on the DSPXmini-AM Getting the sound that you want Managing Presets Factory presets Remote control of the DSPXmini-AM... -
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
X represents many things. DSPX was born. Once again, thank you for your purchase; we hope you enjoy the DSPXmini-AM! BW Broadcast Team... -
Page 7: Introduction To The Dspx Mini-Am
Comprehensive control of every processing parameter is available to the user both from the front panel control system and by remote (computer) control. At a fraction of the size, weight and price of its rivals, the DSPXmini-AM is small but serious AM processor. Dynamic, fresh & innovative... -
Page 8: Dspxmini-Am Connections
Connections... -
Page 9: Dspxmini-Am 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-AM. If we were to have used the same scale as the input metering we would not see a lot of activity on the bars. -
Page 10: Quickstart
UICK START 1. Install the DSPXmini-AM into the rack. 2. Connect AC power to the unit, and turn on the power. 3. Connect the analogue or digital audio input. 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 And Hf Boost
The DSPXmini-AM has the ability to substantially improve the quality of your ON-AIR broadcast. However the DSPXmini-AM can only work with what you provide it. The best performance will be obtained when the DSPXmini-AM is fed with very clean source material. After dynamic range reduction is performed, poor quality source material will sound poorer when processed with the DSPXmini-AM. -
Page 13: Low Pass Filtering
OW PASS FILTERING To accommodate various bandwidth limitation requirements in different countries, the DSPXmini-AM has an adjustable low pass filter. The filter is adjustable from 4 kHz to 10 kHz in 500 Hz steps. To comply with the NRSC-1 standards (10 kHz bandwidth for analog AM, 8 kHz bandwidth for Hybrid AM IBOC or 5 kHz bandwidth for Hybrid AM IBOC transmission) set the filter to 10 kHz, 7.5 kHz and 4 kHz respectively. -
Page 14: The Dspxmini-Am And Its Processing Structure
Bass enhancement The DSPXmini-AM 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 4 Q's. This can be thought of as a simple bass parametric. -
Page 15: Processing Block Diagram
Block Diagram... -
Page 16: The Dspxmini-Am 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 17: The Menu Structure
DAYPARTS 5-8 TRUCTURE DP(X) ON/OFF DP(X) START TIME MENU: INPUT DP(X) TIME ON (LENGTH) INPUT SOURCE ANALOG LEVEL MENU: SYSTEM RIGHT TRIM LCD CONTRAST MODE TRIGGER PORT HP FILTER CODE LOCK REMOTE SOURCE MENU: PROCESS MENU: LAN CONFIG MENU: EQ PEAKING BASS GAIN DG (DEFAULT GATEWAY) PEAKING BASS FREQ... -
Page 18: Processing Parameters
'ANALOGUE INPUT A/D CLIP LEVEL' This parameter allows you to set the analogue input level with refer- ence to the DSPXmini-AM's A/D Converter. This would normally be set to +24dBu if driving the DSPXmini- AM from professional audio equipment. When adjusting make sure that the input audio meters NEVER show clipping under any conditions. - Page 19 MAIN CLIPPER DISTORTION CONTROL' Controls the distortion reduction effect of the distortion con- troller in the DSPXmini-AM's back-end clipping system. The range of multi-band clipping control is 1 to 10. Setting this control to 1 virtually defeats the mechanism, while higher numbers will progressively make the mechanism work on reducing the distortion and keeping the cleanliness of your on-air sound.
- Page 20 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-AM’s Real Time Clock. 'DAYPARTING ON/OFF: Enables or disables the scheduling. 'DP(X) ON/OFF' Enables or disables an individual daypart schedule.
- Page 21 'PORT' Sets the port number of the LAN port 'ABOUT' DSPXmini-AM version number and design credits. 'BOOTLOAD' This option is used to FLASH update the software and firmware inside the DSPXmini-AM. Further information on using this option is described in the documentation supplied with the upgrade.
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Page 22: Setting Up The Processing On The Dspxmini-Am
This effect can be compensated somewhat by enhancing the bass prior to multi-band processing. The DSPXmini-AM 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 64 different bass curves to select from. - Page 23 The multi-band limiters in the DSPXmini-AM 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 24 liseconds, reducing loudness and creating audible pumping effects. The solution is multiple time constants where one set of time constants can be set to handle the fast peaks and another to handle the average level of limiting. Fast transients will release in a faster less noticeable way and won't punch holes in the sound in a way that single time constant limiters can.
- Page 25 The mixer The post limiters mixer in the DSPXmini-AM 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 26 There are two things you can do to prevent this and optimise your modulation usage. The best solution is to remove (or at least increase) the capacitors in the input circuits in your transmitter. The DSPXmini-AM has no DC offset and therefore these capacitors are not necessary when DSPXmini-AM is connected directly to the transmitter.
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Page 27: Getting The Sound That You Want
ETTING OUND While the DSPXmini-AM can help you obtain the sound that you want we must always take into account the limi- tations presented by the transmission channel. The biggest problem we have is the maximum peak level that can be handled by that transmission channel. - Page 28 Decrease the clipper hardness control. 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 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 29: Managing Presets
ANAGING RESETS FRONT PANEL CONTROL Your processor 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 30: Factory Presets
RESETS The factory presets in the DSPXmini-AM are not supposed to be de-facto standards by any means but are start- ing points for you to create your own user presets. It is impossible to create presets that will suit every format and market. -
Page 31: Remote Control Of The Dspxmini-Am
PC. The remote control program is available for download from www.bwbroadcast.com The DSPXmini-AM can only to talk to the serial system (RS232) 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-AM’s front panel. - Page 32 If you wish to use the NET/LAN port to control the DSPXmini-AM follow the steps below 1. Connect a cat 5 cable to the RJ45 port on the DSPXmini-AM 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 33 Understanding the preset list The preset list contains all of the presets contained in the DSPXmini-AM. 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 34 '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-AM will 'on air' the selected preset when the daypart or trigger hands back control to the default preset.
- Page 35 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-AM. 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 36 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 37: Remote Trigger Port
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 38: Security Code Lock
If unsuccessful you will be required to try again. If successful the DSPXmini-AM will allow you to re-confirm the code or change it. This is where you may want to change the fac- tory default code if you have not already done so. -
Page 39: 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 40: Specifications
PECIFICATIONS Specifications apply for measurements from analog left/right input to the analog left/right output. Measurements apply to AM mode of operation. Frequency Response (Bypass Mode): ±0.10 dB, 2.0 Hz–10 kHz or as set with an adjustable low-pass filter. Noise: Output noise floor will depend upon on the processor settings. The maximum dynamic range is deter- mined by the dynamic range of the A/D Converter, which is 107 dB. - Page 41 Output Level (100% peak modulation): –12.0 to 0.0 dBfs software controlled. Filtering: RFI filtered. Remote Control Configuration: Serial communication over TCP/IP network or direct serial connection. Serial cable sup- plied with the unit. USB Port: B type connector (front panel) Serial Port: DB9 (rear panel) 19200 kbps, RFI supressed Ethernet Port: 10 Mbit/sec on RJ45 female connector, RFI supressed Remote Control (trigger port): DB9 opto-isolated and floating.
- Page 42 DSPXmini-AM v101 preset sheet Preset 1 Preset 2 Preset 3 Preset 4 INPUT SOURCE ANALOG LEVEL RIGHT TRIM INPUT MODE PROCESS BASS PEAK GAIN BASS PEAK FREQ BASS PEAK Q HF SHAPE HF GAIN BAND 1 DRIVE ATTACK DECAY GATE...
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Page 43: Preset Sheet
B4 MIX LEVEL CLIPPER BASS CLIP LEVEL MAIN CLIP DIST CTRL FINESSE HARDNESS MAIN CLIP DRIVE OUTPUT LOW PASS FILTER TILT EQ TILT FREQ ASYMMETRY POLARITY Preset Sheet... - Page 44 www.bwbroadcast.com...
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