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DSPX-FM

Broadcast Audio Processor

Operational Manual

Version 3.20

www.bwbroadcast.com

Содержание DSPX-FM

Страница 1: ...DSPX FM Broadcast Audio Processor Operational Manual Version 3 20 www bwbroadcast com...

Страница 2: ...12 The DSPX and its processing structure 13 The processing path 13 Processing block diagram 15 The DSPX menu system 16 The Menu stucture 17 Setting up the processing on the DSPX 25 Getting the sound...

Страница 3: ...such a modification adaptation 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...

Страница 4: ...rs stoves 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 mark...

Страница 5: ...ive 2004 108 EC 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 installe...

Страница 6: ...as a desire to research the project for as long as necessary to get the job done We also knew that by combining the research with BW s embedded systems skills and ability to manu facture low cost cutt...

Страница 7: ...trigger port 2 x RS232 ports 200 LEDS metering an LCD screen 2 sample rate converters a headphone jack and memory devices to hold the software and firmware The Processing Architecture After input sele...

Страница 8: ...8 20 22 24 0 1 2 3 4 5 6 9 12 15 18 21 110 100 90 80 70 60 50 40 30 20 10 PILOT dB dB dB dB USB DSP X UP LOAD SAVE DSPX OUTPUT PROCESS HOLD INPUT HEADPHONE JACK METERING USB PORT STATUS LEDS SOFT KEYS...

Страница 9: ...racks the absolute value of the waveform G R metering The gain reduction meters show the gain reduction and gating status of the main processing blocks The range shown is 0dB to 24dB in 2dB steps with...

Страница 10: ...6 Connect the audio outputs as required and set the de emphasis for the analogue and digital outputs to OFF MODE to DR and set the output levels for the analogue and digital outputs to match the equip...

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: ...the DSPX FM to process for FM broadcast you will need to enable the pre emphasis filter in the DSPX Even though your STL or transmitter may contain pre emphasis we recommend disabling it letting the D...

Страница 13: ...e the original audio more accurately with less bits of digital information because it is not wasting bits encoding non audible clipping artefacts Look ahead limiting produces less harmonic distortion...

Страница 14: ...ng path is routed to and provides output level con trols A de emphasis option is provided on both the analogue and digital outputs The digital output sample rate can also be configured to a variety of...

Страница 15: ...MID1 LIM HIGH LIM MB LIM MID2 LIM LPF BASS CLIP BPF MID CLIP HPF HF CLIP N 1 DELAY ATTACK RELEASE LOOKAHEAD SOFT HARD N 1 DELAY ATTACK RELEASE LOOKAHEAD N 1 DELAY ATTACK RELEASE N 1 DELAY ATTACK RELE...

Страница 16: ...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 17: ...BAND4MIX MENU LOOKAHEAD LIMITER DRIVE SHELF LOW ATTACK LOW DECAY MID ATTACK MID DECAY HIGH ATTACK HIGH DECAY MENU CLIPPERS MULTI BAND CLIP DRIVE BASS CLIP LEVEL BASS CLIP TYPE MID CLIP LEVEL HF CLIP...

Страница 18: ...ion in aggressive presets by reducing asymmetry in the voice which would otherwise put more workload on the clipping stages We rec ommend enabling this option if you want competitive loudness otherwis...

Страница 19: ...unity gain through the AGC when the wideband AGC drive control is set to 0 dB The ENHANCE menu contains the low frequency enhancement filters which are used to provide bass enhancement and help overco...

Страница 20: ...peak to average ratio The window gating also allows faster rates to be used without the audible effects normally associated with the faster rates The multi band AGC bands can be individually disabled...

Страница 21: ...udio The level can be adjusted to turn on when the input drops to a level from 20dB to 40dB The HOLD can also be switched off DELAY This function provides a delay before the peak decay circuit is acti...

Страница 22: ...uted into the secondary time constant circuit The attack time can be varied between 1 and 10 which corresponds to 10mS to 2000mS on a semi exponential scale MID DECAY Controls the average decay rate o...

Страница 23: ...tion control A setting of 1 effectively bypasses this control This control is very subtle and may not appear to do a lot on some program material while a lot on others HINT Overdrive the main clipper...

Страница 24: ...y reduce the loudness of your signal and should be used only if the regulations in your country require you to comply with ITU BS 412 Otherwise set this parameter to off The thresholds are calibrated...

Страница 25: ...s relevant to the LAN NET port IP Sets the IP address of the LAN port DG Sets the default gateway of the LAN port SM Sets the subnet mask of the LAN port MA1 Sets the first half of the MAC address of...

Страница 26: ...his coloration is often used for artistic effect Pre emphasis This parameter selects the standard 50uS and 75uS pre emphasis curves used in FM broadcasts The param eter can be bypassed with the OFF op...

Страница 27: ...B would set the AGC to unity gain bypass 0 12 12 dB 0dB gain We mentioned the return to rest level This is the level that the gain reduction will move towards under gated conditions The options are 4d...

Страница 28: ...in riding is evident Silence and window gating enabled Gain riding is virtually removed The effect of the gating controls on program material AGC attacking and decaying with faster time constants AGC...

Страница 29: ...to the multi band AGC are identical to that of the wideband AGC We have also included access to the AGCs ratio controls and this will be touched on in this section The other controls won t be discuss...

Страница 30: ...n dle 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 limi...

Страница 31: ...ower setting of the average attack Limiter control signals response to tone bursts To recap the peak attack time and average decay time play the same sort of role as that of a standard conven tional s...

Страница 32: ...and 1 with a coupling of 50 we would ensure that the band 1 gain reduction could never decrease less gain reduction more than 6dB past the band 2 gain reduction If the cou pling was set to 100 then th...

Страница 33: ...nts through rather than clamping down the whole audio signal whenever a transient occurs These small transients can audibly dominate the limit ing if the attack time of the limiter is too fast It is m...

Страница 34: ...ng Look ahead limiting produces a soft clipping function on the bass and this significantly reduces distortion in the bass clipper There are a couple of down sides to this option The first is latency...

Страница 35: ...rease the drive more loudness will be obtained but at the expense of IM distortion which will start to make the audio sound busy and packed The adjustable time constants in the look ahead limiter also...

Страница 36: ...equired by the BS 412 standard It will do so with the slow limiter to avoid noticeable pumping which is the consequence of the standard requiring measurement of the pre emphasized composite signal and...

Страница 37: ...d the waveform is allowed to pass to the following peak limiter Reduce the band and channel coupling ratios While it is possible to create a strange response in the multi band AGC it is hard to produc...

Страница 38: ...ontrol Look ahead limiter DRUSE Increase the look ahead limiter drive Decrease the attack time constants speeding up the attack of the secondary time constant circuits Increase the decay time constant...

Страница 39: ...control distortion controlled clipping that is performed Digital radio users should avoid high HF clipping settings as they put extra workload on the look ahead limiter Dual use FM and DR users can c...

Страница 40: ...imiter decay time constant speeding up the decay of the secondary time constant circuit WE SUGGEST ONLY SMALL MODIFICATIONS FROM FACTORY PRESET SETTINGS IF YOU ARE MODYFYING LOTS OF THE PARAMETERS IF...

Страница 41: ...ou press the DONE soft key to save the preset to the DSPX FM 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 select...

Страница 42: ...thats what your after F4 ROCK Nice presence F5 HOT ROCK A pleasing and exciting mix of bass and HF when you need greater loudness than the HOT preset F6 HOT Nice balance of bass and treble F7 HOT AC T...

Страница 43: ...of this manual This section of the manual will refer to only serial and lan ports as the rear panel serial port and front panel USB port are the same to the DSPX FM they are only differentiated by th...

Страница 44: ...n on password control elsewhere in this manual NET LAN PORT The DSPX FM is equipped with a NET LAN port for ease of remote control setup and monitoring CONTROL OF THE DSPX FM BY THE NET LAN PORT If yo...

Страница 45: ...ding on what option is selected on the menu tree located to the left of the screen The DSPX FM remote control application has three windows The left hand contains the navigation preset window The top...

Страница 46: ...e are two additional identifiers to mark these occurrences DP for Daypart and TR for remote trig ger If a daypart of trigger occurs the TR or DP will appear next to the name and the preset name will c...

Страница 47: ...a factory preset Rename preset Rename preset allows the user preset name to be edited You are restricted to 15 characters Saving presets to PC This option will pop up the standard windows save dialog...

Страница 48: ...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 arrows...

Страница 49: ...g the default preset and overlaying dayparts we are able switch presets significantly more than you first think you will be able to A B COMPARISON FEATURE The Remote application has two buttons labell...

Страница 50: ...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 51: ...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 DSPX FM will allow you to re confirm the code or...

Страница 52: ...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 53: ...m electronically balanced and floating Load Impedance 600 Ohm or greater balanced or unbalanced Output Level 100 peak modulation Adjustable from 12 dBu to 24 dBu peak into 600 Ohms or great er load so...

Страница 54: ...38 kHz Suppression 70 dB 76 kHz Sideband Suppression 80 dB Connectors BNC floating over chassis ground Filtering RFI filtered Subcarrier SCA Inputs Configuration Subcarrier input sums into composite b...

Страница 55: ...htclicking on the appropriate connection and selecting Disable from the menu The connection can be re enabled after the installation is complete This is not necessary under Windows XP SP 2 if configur...

Страница 56: ...s in the example below or browse to it by clicking the browse button Once the file path has been entered in the box click next to proceed If Windows XP is configured to warn when unsigned non WHQL cer...

Страница 57: ...XP copies the required driver files Windows should then display a message indicating that the installation was successful Click Finish to complete the installation This has installed the serial conver...

Страница 58: ...rd will continue by installing the COM port emulation driver The procedure is the same as that above for installing the serial converter driver Open the Device Manager located in Control Panel System...

Страница 59: ...Hz Hz BASS PEAK Q BASS PEAK GAIN dB dB dB dB XOVER B1 2 B2 3 B3 4 B4 LPF MB AGC GATING TYPE B1 2 COUPLING B2 3 COUPLING L R COUPLING BAND 1 DRIVE dB dB dB dB ATTACK DECAY GATE dB dB dB dB RTP LEVEL dB...

Страница 60: ...TTACK AVERAGE DECAY HOLD dB dB dB dB DELAY BAND 4 DRIVE dB dB dB dB THRESHOLD dB dB dB dB PEAK ATTACK PEAK DECAY AVERAGE ATTACK AVERAGE DECAY HOLD dB dB dB dB DELAY HF CLIPPING MIXER B1 MIX LEVEL dB d...

Страница 61: ...Appendix B Preset Sheet 61 MID DECAY HIGH ATTACK HIGH DECAY OUTPUT STEREO LEVEL dBu dBu dBu dBu PILOT LEVEL PILOT PROTECTION ITU LIMITER dBr dBr dBr dBr 19kHz SYNC...

Страница 62: ...www bwbroadcast com...

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