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OPTIMOD-PC INTRODUCTION

1-29

Sample Rate and Audio Bandwidth

Most DAB audio is at 48 kHz sample rate. However, AM HD Radio operates at 32
kHz, requiring 15 kHz audio bandwidth. The Eureka-147 system offers a 24 kHz
sample rate option, requiring 10 kHz audio bandwidth.

OPTIMOD-PC’s bandwidth can be adjusted from 10 kHz to 20 kHz to provide cor-
rectly anti-aliased audio for any of these systems. If any anti-aliasing filters following
OPTIMOD-PC’s output are phase-linear and have integer-sample time delays, these
filters will pass the band-limited OPTIMOD-PC output without introducing overshoot
because they remove no further spectrum and do not cause their output samples to
become asynchronous with the peak-controlled samples at OPTIMOD-PC’s output.

OPTIMOD-PC always operates at 48 kHz sample rate internally. Its output is
equipped with a sample rate converter that can output at 32 kHz, 44.1 kHz, 48, 88.2,
or 96 kHz. These rates can be synchronized to either AES3 digital input (see page 1-
22).

We expect that transmitters that transmit sample rates below 32 kHz will provide
internal sample rate conversion, and that most will probably accept audio at 48 kHz
sample rate regardless of the final sample rate of the transmission. Any sample rate
conversion may cause the transmitted sample to become asynchronous to the peak-
controlled samples emerging from OPTIMOD-PC and may therefore introduce over-
shoot. Fortunately, as the audio bandwidth becomes lower this becomes less of the
problem because the 48 kHz sample rate within OPTIMOD-PC oversamples the au-
dio. It is therefore less likely that peaks will “slip between the samples.”

Subframe Delay

OPTIMOD-PC provides an adjustable time delay of up to 60 milliseconds. This allows
the installer to force the total delay through the processing to equal one frame (in
video applications). The definition of “frame” depends on the system in which
OPTIMOD-PC is installed.

The selections are

M

INIMUM

(typically 24 ms delay; depends on crossover

settings and whether 2-band or 5-band processing is active), 30 fps (NTSC
monochrome video), 29.97 fps (NTSC color video), 25 fps (most PAL
video), and 24 fps (film). You can also adjust the delay in one-millisecond
increments from 33 to 60 ms.

Setting Output/Modulation Levels

In a perfect world, one could set the peak level at OPTIMOD-PC’s output to 0dBfs.
However, there are at several potential problems that may make it desirable to set
the modulation level slightly lower.

•

First is asynchronous re-sampling, which we have discussed at length earlier in
this chapter. (See page 1-24, for example.) If any digital processing that causes
its output samples to be asynchronous to its input samples is used after
OPTIMOD-PC’s output, this can cause the peak levels of individual samples to

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Содержание OPTIMOD-PC 1100

Страница 1: ...Operating Manual OPTIMOD PC 1100 Digital Audio Processor on a PCI Sound Card Software Version 2 0...

Страница 2: ...CK DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE This symbol wherever it appears alerts you to the presence of uninsulated dangerous voltage inside the enclosure voltage that may be sufficient to c...

Страница 3: ...ring the unit 2 Seal the carton with tape If you are returning the unit permanently for credit be sure to enclose The Manual s The Registration Warranty Card Your dealer may charge you for any missing...

Страница 4: ......

Страница 5: ...Operating Manual OPTIMOD PC 1100 Digital Audio Processor on a PCI Sound Card Software Version 2 0...

Страница 6: ...umerique n emet pas de bruits radioelectriques depassant les limites applicables aux appareils numeriques de las class A prescrites dans le Reglement sur le brouillage radioelectrique edicte par le mi...

Страница 7: ...I O 1 13 Digital AES3 Left Right Input Output 1 14 Analog Left Right Input Output 1 15 The Orban I O Mixer 1 15 Figure 1 5 Typical I O mixer 1 16 OVERVIEW OF AN OPTIMOD PC INSTALLATION 1 17 Simple Op...

Страница 8: ...6 Figure 2 4 The Orban Control Application 2 6 5 Connect hardware inputs and outputs optional 2 6 6 Set up passwords and card names for cards in your computer optional 2 7 Figure 2 5 Card Security Adm...

Страница 9: ...Devices 2 35 Enabling the Windows 2003 Server Audio Service 2 36 PROBLEMS AND POSSIBLE CAUSES 2 37 When I first turn on my computer the sound seems wrong 2 37 When I Launch the OPTIMOD PC control appl...

Страница 10: ...APPLICATION 3 1 INTRODUCTION TO PROCESSING 3 4 Some Audio Processing Concepts 3 4 Distortion in Processing 3 4 Loudness and Distortion 3 4 Speech Music Detector 3 5 Processing for Low Bitrate Codecs...

Страница 11: ...Band Structure s Full and Advanced Setup Controls 3 46 Table 3 9 Five band Controls 3 46 Table 3 10 MB Attack Release Controls 3 47 Table 3 11 MB Band Mix Controls 3 50 IF THE HOST COMPUTER RESTARTS O...

Страница 12: ...excessive 3 5 buzzes 2 39 C cable shielding 2 16 cable 2 16 Classical music 3 21 clicks in WAVE output 2 39 clicks 2 39 clipper control list 3 38 clipper bass 3 11 clipping 2 33 clipping 3 4 codec aa...

Страница 13: ...radio 3 20 tv 3 26 factory presets 1 11 features 1 7 file setup 2 43 file menu 3 3 Final Limit control 3 39 Firewall NAT 2 54 Firewall 2 51 five band band coupling controls 3 49 delta release control...

Страница 14: ...2 41 Lo Pass control 3 31 Location streaming 1 21 location 1 26 logo customizing 2 45 look ahead limiter XE presets AGC 3 XE presets protection 3 using 1100 as 3 19 look ahead limiting 3 4 lossy data...

Страница 15: ...20 phase rotator 3 10 Phase Rotator 3 31 phase linear two band purist processing 3 12 Plink 2 46 port default 2 53 power ground 2 19 PPM 1 4 PreCode 3 5 PreCode technology 1 1 preemphasis 2 24 prepari...

Страница 16: ...r 3 31 S sample rate 1 29 sample rate 2 23 sample rate 3 10 Security 1 19 Server editing properties 2 11 service 2 43 44 setup file 2 20 shelving equalizer bass slope of 3 11 shipping container 2 1 da...

Страница 17: ...ng control 3 44 master attack control 3 44 master compression threshold 3 44 release control 3 41 two band processing structure 3 26 two band structure 3 40 U unbalanced inputs 2 16 uninstall 2 44 Uni...

Страница 18: ......

Страница 19: ...window gated AGC V2 s AGC matches the sound of the AGC in Orban s 2300 5300 8300 8400 8500 and 9400 so it is a perfect studio AGC for these products V2 features Orban s new PreCode technology This man...

Страница 20: ...f these and for any other digi tal transmission media and channels OPTIMOD PC s three on board Motorola DSP56362 DSP chips provide a loud consistent sound to the consumer by performing automatic gain...

Страница 21: ...adcasters generally believe that loudness relative to other stations attracts an audience that perceives the station as being more powerful than its competition We expect that the same subliminal psy...

Страница 22: ...eatures found in Opti mod PC Peak clipping sounds bad even in uncompressed digital channels because these channels do not rely on pre emphasis de emphasis to reduce audible distortion In stead of peak...

Страница 23: ...responds to 4 dBu Instantaneous peaks will reach 17 dBu or more on voice In facilities that use PPMs that indicate level directly in dBu maximum program and line up level is often 6 dBu Instantaneous...

Страница 24: ...hich may be connected to a PCI expansion chassis with as many OPTIMOD PC cards as you have free PCI slots each card handling one stereo pro gram Each card has two AES3 or SPDIF digital inputs and one...

Страница 25: ...co dec performance on some codecs by reducing audio processing induced codec artifacts even with program material that has been preprocessed by other proc essing than Optimod While primarily oriented...

Страница 26: ...hardware inputs Wave output to any PC audio application that can record or encode AES3 digital output at 32 44 1 48 88 2 or 96 kHz sample rate Supplied WAVE drivers allow OPTIMOD PC s processed outpu...

Страница 27: ...espond to different programming formats These presets have already been tested and field proven in major market radio netcasting digital radio and direct satellite broadcasting applications both radio...

Страница 28: ...PC rides gain over an adjustable range of up to 25dB compressing dynamic range and compensating for operator gain riding errors and for gain inconsistencies in automated systems OPTIMOD PC s processi...

Страница 29: ...ing between the contents of the two nearest less more files The suffix of the master Factory preset files is ORBF11 Within the preset folder on your hard drive there is a corresponding less more folde...

Страница 30: ...modate User Presets are shown on the Open Preset list by the name that you gave them when you saved them You can name them as you wish limited only by the file naming limits in your oper ating system...

Страница 31: ...to the sample rate present at the sync input PCI Bus OPTIMOD PC Processing SRC SRC SRC SRC SRC Analog Output Digital Output ADC PROCESSOR MIXER Analog IN Digital IN 1 Digital IN 2 Wave OUT DIRECT MIXE...

Страница 32: ...ou are using Generally if the equipment to which you are connecting has pin jacks set OPTIMOD PC to use the SPDIF standard If the equipment has XLR type connectors or BNC connectors set OPTIMOD PC to...

Страница 33: ...OPTIMOD PC s AES3 or WAVE outputs to drive your transmission chain For a more detailed diagram of the Processor block see Figure 3 2 Simplified OPTIMOD PC Digital Signal Processing Diagram on page 3...

Страница 34: ...ws all processing including peak limiting Not all outputs have to receive the same source any source can feed any output Source 3 can provide low delay monitoring into live talent headphones because i...

Страница 35: ...y control OPTIMOD PC cards that are installed in the same PC that is running the Orban application Network operation allows you to control one or more OPTIMOD PC cards over a network regardless of whe...

Страница 36: ...perform some housekeeping chores It must run Orban s server software and more signifi cantly it must do sample rate conversion if OPTIMOD PC is used as a WAVE device and the source or destination sam...

Страница 37: ...king is activated cards located in a given machine are visi ble only to the Orban Control application running locally on that ma chine They are invisible to other machines on the network Not running i...

Страница 38: ...ntrol of a card by changing its name or password Only an administrator can do that Meanwhile the administrator can change User passwords and rename cards from a central location It is wise to do this...

Страница 39: ...and the remember password status can only be canceled by an administrator Remember password can compromise se curity so you should use this feature with discretion Only one client can be logged into a...

Страница 40: ...ce see step 4 B on page 2 23 This reference can be the sample frequency of one of the active audio inputs On the other hand if you have an AES3 stream available exclusively as a sample fre quency refe...

Страница 41: ...roc essed audio for application to OPTIMOD PC s input or they can pass OPTIMOD PC s peak controlled output The two applications have fundamentally different per formance requirements A link that passe...

Страница 42: ...OD PC s monitor output This is not recommended because OPTIMOD PC s monitor output will overshoot in the analog domain because of the physics of the system The use of external digital to analog conver...

Страница 43: ...utput to the transmitter Lack of transparency in the analog path will cause even more over shoot Unless carefully designed microwave STLs can introduce non constant group delay in the audio spectrum d...

Страница 44: ...arities and non constant group delay characteristics will alter the peak to average ratio and will thus reduce the effectiveness of any peak limiting performed prior to their inputs Location of OPTIMO...

Страница 45: ...fections in the link Where maximum quality is desired it is wise to request that all equipment in the signal path after the studio be carefully measured aligned and qualified to meet the appropriate s...

Страница 46: ...y change the frequency balance of the program This can cause noise that would otherwise have been masked to become unmasked because the psychoacoustic masking conditions under which the masking thresh...

Страница 47: ...tted sample to become asynchronous to the peak controlled samples emerging from OPTIMOD PC and may therefore introduce over shoot Fortunately as the audio bandwidth becomes lower this becomes less of...

Страница 48: ...erformance of real world receivers and will reduce the peak modulation of the transmissions if it turns out that most receivers are clipping due to perceptual encoding over shoots Our experience to da...

Страница 49: ...audio system such as a digi tal playout system One of the outputs of OPTIMOD PC s routing switcher sends audio back into the computer s internal WAVE audio system You will ordinarily connect this str...

Страница 50: ...ainment quality stereo streams at 32 kbps At 48 kbps many listeners prefer the sound to that of FM OPTICODEC PC PE is designed to work exclusively with OPTIMOD PC to form an overall audio processing c...

Страница 51: ...popcorn and the like are acceptable cushioning materials crumpled newspaper is not Wrap cushioning materials tightly around the card and tape them in place to prevent the card from shifting out of its...

Страница 52: ...r Orban Products This warranty gives you specific legal rights and you may have other rights that vary from state to state Some states do not allow the exclusion of limitations of inciden tal or conse...

Страница 53: ...rchase to Gareth Paredes at 510 351 0500 I ACCEPT THE EXTENDED FIVE YEAR WARRANTY __________________________________________________________________________ DATE_______________________________________...

Страница 54: ......

Страница 55: ...its packing materi als because both the carton and packing material have been carefully de signed to protect the unit In particular static discharge can damage OPTIMOD PC and it should always be store...

Страница 56: ...boot process is finished the New Hardware Detected window will appear B In the New Hardware Detected wizard s welcoming screen click Next Windows will identify the card s hardware ID as Optimod1100 C...

Страница 57: ...ar warning you that the software has not passed Windows logo testing E Select continue anyway A dialog box appears that says Completing the New Hardware Found Wizard F Select Finish G Optional If you...

Страница 58: ...ystem Card Serial Card Name Card Serial Card Name Card Serial Card Name Security Security Security REMOTE IP Address Profile Name Server System Server Software Card Serial Card Name Card Serial Card N...

Страница 59: ...ows 2000 you will have to update the OPTIMOD PC driver manually from Windows The V2 updater only updates the OPTIMOD PC driver automatically in Windows XP 1 2 3 4 5 6 7 8 9 10 11 12 13 25 24 23 22 21...

Страница 60: ...XLR connectors for balanced operation one terminated with RCA connectors for unbalanced operation and one with bare wires Figure 2 2 on page 2 5 shows how these cable assemblies are wired and can be u...

Страница 61: ...rds in your computer optional A Start the Optimod PC control application Optimod exe by clicking its icon agent in your computer s system tray or from Start Programs Orban Optimod PC See Figure 2 4 on...

Страница 62: ...10 F Assign an Administrator Password to the card by filling in the ADMINISTRATOR PASSWORD and CONFIRM PASSWORD fields identically Do not make the User and Administrator passwords identical Be sure to...

Страница 63: ...ss the OPTIMOD PC TCP IP terminal server to allow external control of the OPTIMOD PC cards from either a Telnet SSH client or a custom third party application See Optimod PC System Mixer Control API o...

Страница 64: ...cified computers to access local cards via the OPTIMOD PC TCP IP Terminal Server check the Terminal Control USE NETWORK ACCEPT LIST The Network Accept List adds another layer of security beyond passwo...

Страница 65: ...nter an Administrator Password in step 6 E you will not see the Enter Administrator Password dialog box and the Card and Se curity Administration window will appear immediately C The Card and Security...

Страница 66: ...p pears b Enter the Profile Name IP Address and Port of the remote computer The Profile Name can be any name you wish to use for example Boston The profile name is known only to your local computer Th...

Страница 67: ...isplay the state of the card to which you just connected and you can recall presets adjust in put output levels edit and save presets etc 12 Change passwords and card names over a network optional If...

Страница 68: ...optional If a computer running the OPTIMOD PC control application contains no OPTIMOD PC cards you may wish to defeat the OPTIMOD PC service on that computer although this is not required This scenar...

Страница 69: ...t after a system crash The server application has no user controls and you do not have to interact with it or otherwise worry about it other than to be aware that it is normal for it be running in the...

Страница 70: ...ndards In the RCA type connectors the center pin called T for tip in the diagram is HIGH while the outer sleeve called S in the diagram is LOW and SHIELD See Figure 2 2 Wiring Diagram for the OPTIMOD...

Страница 71: ...tandards to circuit ground and take the HIGH output from the remaining pin No special precautions are required even though one side of the output is grounded Use two conductor foil shielded cable Beld...

Страница 72: ...s and have the backup inputs activate automatically if the primary program feed is lost Note that OPTIMOD PC does not fully implement the AES11 standard be cause it also does not pass AES3 user bits a...

Страница 73: ...ains these sound editing controls in detail This section of the manual tells you how to set up the input and output controls of a OPTIMOD PC card with emphasis on connections that use OPTIMOD PC s ext...

Страница 74: ...m orbs The current active setup file is a transient file That is the Orban Control application updates it whenever you change the setup manually The Orban Control application also automatically update...

Страница 75: ...MOD PC s bandwidth is always the lowest of these settings The frequency in Setup is a technical parameter that determines the highest bandwidth avail able The installing engineer should set it to be a...

Страница 76: ...using an Orban 4000 Transmission Limiter set the AGC to ENABLED so that the AGC function in OPTIMOD PC continues to work The Orban 4000 is a transmission system overload protection device it is normal...

Страница 77: ...ynchronized to a source The INTERNAL sync setting synchronizes the output words at the AES3 out put to OPTIMOD PC s internal clock The EXTERNAL setting synchronizes the output rate to the input rate Y...

Страница 78: ...operates Flat 50 s 75 s Normally OPTIMOD PC will feed transmission channels that do not use preemphasis and you should set this control FLAT Rarely the transmission channel uses preemphasis An exampl...

Страница 79: ...eter with problem atic material Continue to lower the B5 THRESHOLD control until you no longer hear gain pumping Instead you will probably hear some high frequency loss This loss is less subjectively...

Страница 80: ...s gain is cali brated correctly The reason it cannot predictably do this is that there is another WAVE gain control in series with the master volume control This control is located in the Windows Mix...

Страница 81: ...n the ANALOG L R INPUT control hits full scale when you apply normal program material to the analog input reset the ANALOG INPUT REFERENCE LEVEL to 4DBU ANALOG L R INPUT controls are found on the PROC...

Страница 82: ...u or 10 dBV depending on the setting of Optimod PC s ANALOG OUTPUT REFERENCE LEVEL When the ANALOG INPUT control is set to 0dB maximum and the ANALOG OUTPUT control is set to 0dB maximum the system is...

Страница 83: ...lication choose FILE OPEN PRESET The Open Preset dialog box appears b Click ROCK MEDIUM in the preset list The ROCK MEDIUM preset becomes active The dialog box remains open until you explicitly close...

Страница 84: ...C on page 2 22 d Click the PROCESSOR MIXER tab e Set the ANALOG L R INPUT fader to make the AGC GAIN REDUCTION meter on the main meter screen in the Orban Control application indicate an average of 10...

Страница 85: ...D PC will automatically switch to a backup feed if a primary feed fails The ANALOG L R and DIGITAL 2 in puts can be programmed to mute automatically if the DIGITAL 1 input is locked to an AES3 input s...

Страница 86: ...nd compressor ahead of the look ahead limiter can be more comfortable to a DJ or presenter who is monitoring his or her voice live through headphones Each of the three outputs has an attenuator and a...

Страница 87: ...mple from 16dBfs to 18dBfs you can do so by adjusting the fader corresponding to the source in our example by setting it to 2dB Note that you are limited by input headroom if you set the DIGITAL 1 fad...

Страница 88: ...eds the OPTIMOD PC s WAVE OUT FROM PC faders in both the PROCESSOR MIXER and DIRECT MIXER pages Because the volume controls on most WAVE applications are attenuators only providing no gain at any sett...

Страница 89: ...d installed these will be known to Win dows as Orban Optimod 1100 Orban Optimod 1100 2 Orban Optimod 1100 3 etc in the order that they are installed in the PCI slots in your computer You may have to e...

Страница 90: ...Cable from Ntonyx can be used Enabling the Windows 2003 Server Audio Service By default some versions of Windows 2003 server have the Audio Service Disabled To use audio Wave I O with OPTIMOD PC you m...

Страница 91: ...C service is being started automatically If the OPTIMOD PC service is not being started automatically these parameters will be re stored when the OPTIMOD PC Control application is launched All others...

Страница 92: ...e are the steps to change the setting on Windows XP A Open the SYSTEM control panel B Select the HARDWARE tab C Select DEVICE MANAGER D Expand the node labeled IDE ATA ATAPI CONTROLLERS E Right click...

Страница 93: ...ill usually operate adjacent to high powered transmitters without difficulty In the most unusual circumstances it may be neces sary to reposition the host computer to reduce RF interference and or to...

Страница 94: ...noise performance of the system is usually limited by the overload to noise ratio of the analog to digital con verter used by OPTIMOD PC to digitize the input This ratio is better than 100dB It is im...

Страница 95: ...heir average level close to that of program material promoting a more consistent and well balanced sound quality To pass line up tones transparently recall OPTIMOD PC s PROTECT preset If neces sary ad...

Страница 96: ...erms of your Limited One Year Standard Warranty which ex tends to the first end user After expiration of the warranty a reasonable charge will be made for parts labor and packing if you choose to use...

Страница 97: ...en the computer shut down If the service does not start up for some reason then this power down processing preset will not be restored and the general purpose preset loaded by the driver run instead T...

Страница 98: ...m its hardware ana log or digital inputs to its hardware outputs Therefore if Windows fails the Optimod PC hardware I O continues to pass and process audio as normal If Op timod PC is located in an ex...

Страница 99: ...e driver and service are required to initialize the card Adding a Logo Displayed to the Control Applica tion A user defined bitmap can be displayed at the right of the meter dialog in the PC Control a...

Страница 100: ...the application is disconnected from a Local card The default port can be changed here too Command Function enum Retrieves serial numbers for each card installed in the computer list Retrieves contro...

Страница 101: ...ate this functionality you may type the commands directly into a Telnet SSH cli ent terminal and see OPTIMOD PC confirmation and status messages Command Values Function DOSR 32kHz 44 1kHz 48kHz 88 2kH...

Страница 102: ...Output Delay AIUMX Stereo MonoL MonoR MonoS Analog Input Unprocessed Mixer Mode D1IUMX Stereo MonoL MonoR MonoS Digital 1 Input Unprocessed Mixer Mode D2IUMX Stereo MonoL MonoR MonoS Digital 2 Input...

Страница 103: ...number 11101 is the default see step 7 D on page 2 9 Each control session requires two ASCII files a bat file that calls Plink to establish a Telnet connection to OPTIMOD PC a reference txt file that...

Страница 104: ...gram audio to be streamed Secondary playout software running on the same computer as OPTIMOD PC plays commercials intended only for the stream This software is configured to use OPTIMOD PC as its soun...

Страница 105: ...11111 APIM Mute disconnect Using Windows Firewall with Optimod PC Depending upon your network security requirements it may be necessary to config ure a software firewall application like Windows Firew...

Страница 106: ...2 52 INSTALLATION ORBAN MODEL 1100 2 Choose the network device that will be used for Optimod PC access and will be protected with Windows Firewall A Click Settings B Click Add...

Страница 107: ...gher than 1024 that is not otherwise as signed according to IANA http www iana org assignments port numbers Port 11100 is the default for the Optimod PC Control Application Port 11101 is the default f...

Страница 108: ...Optimod PC computer by configuring the NAT firewall accordingly The Optimod PC computer is then ad dressed with the network IP address WAN instead of the actual IP address of the Optimod PC computer F...

Страница 109: ...n 3 Operation Figure 3 1 The OPTIMOD PC Control Application The OPTIMOD PC Control Application AGC meter shows the gain reduction of the slow AGC processing that precedes the multiband compressor Full...

Страница 110: ...clipping Output Meters show the output levels of the processed signal before it is ap plied to the output routing switcher in the I O Mixer Limiter meters show the amount of low IM look ahead peak li...

Страница 111: ...of the OPTIMOD PC Mixer by using the SAVE SETUP and OPEN SETUP menu items Edit Menu brings up the Basic Control Advanced Control and the OPTIMOD PC Mixer screens which allow you to edit presets to ge...

Страница 112: ...sound before it is limited This way the limiter can an ticipate peaks that are coming up Distortion in Processing In a competently designed processor distortion occurs only when the processor is cont...

Страница 113: ...ht loss of loudness and punch but misdetection will never cause objectionable distortion on music Speech that is not located in the center of the stereo sound field will always be de tected as music b...

Страница 114: ...ded networks with fewer audio interruptions OPTIMOD PC s ability to maintain source to source spectral consistency is also an important advantage Once you have set up the processing to minimize codec...

Страница 115: ...pressed to best serve the audience The challenge which Optimod 6300 effectively meets is to compress dy namic range unobtrusively OPTIMOD PC can be adjusted so that the output sounds as close as possi...

Страница 116: ...rts presets that be recalled by remote con trol it can be automatically synchronized to the presets on air at a transmitter side Optimod when presets are dayparted To achieve this match A Recall one o...

Страница 117: ...AGC MaxDelta GR Off Stereo Enhancer Out Band 1 5 MaxDeltGR Off Signal Flow PROCESSED WITHOUT LIMITING OUT LOOK AHEAD MAIN OUT LIMITER LOW IM FREQUENCY EQUALIZER LF SHELVING EQ ENHANCER HIGH EQUALIZER...

Страница 118: ...nnecessarily stress this encod ing process Input Conditioning Before the stereo enhancer a sample rate converter converts the sample rate at the digital input to OPTIMOD PC s internal 48 kHz rate This...

Страница 119: ...ctave adjust the shelving frequency and set the amount of equalization OPTIMOD PC s bass midrange and high frequency parametric equalizers have curves that were modeled on the curves of Orban s classi...

Страница 120: ...a clipper and produces modulation sidebands that are less likely to be audible Simple wideband look ahead limiting can still produce audible inter modulation distortion between heavy bass and midrang...

Страница 121: ...e Read Only In this table are sets of subjective setup control settings that provide in our opinion the most favorable trade off between loud ness density and audible distortion for a given amount of...

Страница 122: ...tion applica tions you will find Advanced Modify useful At this level you can customize or mod ify any subjective setup control setting to create a sound exactly to your taste You can then save the se...

Страница 123: ...reduction in the Master and Bass bands The latter reading is useful for assessing the dynamic bass equalization that the AGC produces and it helps you set the AGC BASS COUPLING control Fundamental Req...

Страница 124: ...es the music pre sets When a video oriented preset is on the air the LESS MORE control adjusts the average amount of gain reduction by adjusting the drive level to the Five Band structure s input This...

Страница 125: ...g or dipping when band gains are un equal Allpass also helps make speech waveforms more symmetrical The delay line derived phase linear crossover has the same desirable smoothness in its fre quency re...

Страница 126: ...it There is no way you can erase or otherwise damage the Factory Presets So feel free to experiment If a preset has 2B or 2BAND in its name it will activate the Two Band structure The Protection prese...

Страница 127: ...o style protection limiter to 0 dB To produce look ahead limiter gain reduction turn up the LESS MORE control Each step of the LESS MORE control increases the drive level to the look ahead limiter by...

Страница 128: ...resets have the stereo enhancer turned off to reduce potential codec ste reo encoding artifacts If you wish to reduce the bass set the Band 1 and or Band 2 compression thresholds lower to taste Then s...

Страница 129: ...5 LOUD PUNCHY LOUD PUNCHY 9 0 LOUD SLAM LOUD SLAM 9 0 NEWS TALK NEWS TALK 7 0 ROCK DENSE ROCK DENSE 7 0 ROCK LIGHT ROCK LIGHT 7 0 ROCK MEDIUM ROCK MEDIUM 7 0 ROCK MEDIUM MID BASS ROCK MEDIUM MID BASS...

Страница 130: ...preset uses the ROCK SMOOTH source preset It has a gentle bass lift and a mellow easy to listen to high end along with enough presence energy to help vocals to stand out The COUNTRY LIGHT preset uses...

Страница 131: ...bass punch and transparency improve Therefore exploring various Less More settings is worthwhile with IMPACT because for many circum stances this preset will be over the top if it is not turned down w...

Страница 132: ...intelligible sound from widely varying source material particularly source ma terial that is hot from the field with uncontrolled quality SPORTS Similar to NEWS TALK except the AGC Release AGC Releas...

Страница 133: ...ired SMOOTH JAZZ This preset is designed for commercial broadcasters playing smooth jazz Kenny G etc It is a loud preset that is designed to prevent stridency with saxes and other horns This preset is...

Страница 134: ...input as much as possible TV 2B GEN PURPOSE is usually not the best choice for live news sports or films with optical soundtracks The Five Band presets see below can automatically equalize such progra...

Страница 135: ...ept for BRILLIANCE and DJ BASS these equalization controls are common to both the Two Band and Five Band structures The equalizer is located between the AGC and five band compressor sections of both s...

Страница 136: ...the most mid bass boost yielding a warmer sound Be cause it affects the mid bass frequency range where the ear is more sensitive than it is to very low bass the 6 dB octave slope can create more appar...

Страница 137: ...ra metric equalizer Therefore unlike less sophisticated digital equalizers that use the bilinear transformation to generate EQ curves the shapes of OPTIMOD PC s curves are not distorted at high freque...

Страница 138: ...octaves The range is 0 8 4 0 octaves If you are unfamiliar with using a parametric equalizer one octave is a good starting point Excessive high frequency boost can exaggerate hiss and distortion in pr...

Страница 139: ...mount of equalization in an attempt to make this ratio constant as the program material changes It can therefore create a bright present sound without over equalizing material that is already bright H...

Страница 140: ...hat the program material is actually mono and thus suppresses enhancement to prevent the enhancement from exaggerating the undesired channel imbalance The ratio of L R L R of the enhanced signal tries...

Страница 141: ...djusts several of the dynamics processing controls to optimize the trade offs between unwanted side ef fects If you wish you may adjust the Advanced Modify parameters to your own taste Al ways start w...

Страница 142: ...D DRIVE compressor control AGC Release AGC Master Release control provides an adjustable range from 0 5 dB second slow to 20 dB second fast The increase in density caused by setting the AGC RELEASE co...

Страница 143: ...gate also independently freezes the gain of the two highest fre quency bands forcing the gain of the highest frequency band to be identical to its lower neighbor and independently sets the gain of the...

Страница 144: ...l and the resulting change in output level both measured in units of dB OPTIMOD PC compressor can be operated at a compression ratio as low as 2 1 This can add a sense of dynamic range and is mostly u...

Страница 145: ...the frequency response close to the crossover frequency It is use ful if you need a crossover with low delay and no phase distortion when flat Its downside is the possibility of audible coloration wh...

Страница 146: ...d of the look ahead lim iter depending on the setting of the LESS MORE control in the parent preset upon which you are basing your Advanced Control adjustments This provides headroom for contributions...

Страница 147: ...he peak to average ratio of the processed audio The FINAL LIMIT DRIVE control primarily determines the loudness distortion trade off Turning up the FINAL LIMIT DRIVE control drives the look ahead limi...

Страница 148: ...structures by send ing the output of the desired compressor to the look ahead limiter s input Switch ing between the compressors occurs via a smooth cross fade OPTIMOD PC s Two Band Structure can be m...

Страница 149: ...en and transparent solid and dense or somewhere in between The range is 0 to 25dB Regardless of the release time setting we feel that the optimal amount of gain re duction in the two band compressor f...

Страница 150: ...is that the level of quiet passages in input material with wide dynamic range may eventually be increased unnaturally Accordingly when you operate the 2B REL control between 8 and 2 dB second it may...

Страница 151: ...How ever recovery is slow enough to be imperceptible This avoids OPTIMOD PC s get ting stuck with a large amount of gain reduction on a long low level musical pas sage immediately following a loud pas...

Страница 152: ...miting This control controls the tradeoff between loss of high frequencies due to high frequency limiting and excessive distortion due to clipping FINAL LIMT Final Limit Drive See page 3 39 2B Master...

Страница 153: ...audience and desired market position There are several basic Factory Presets for the Five Band structure Each of these presets can be edited with the LESS MORE control This control affects the video...

Страница 154: ...creasing density can make loud sounds seem louder but can also result in an unattractive busier flatter or denser sound It is very important to be aware of the many negative subjective side effects of...

Страница 155: ...a wall of sound MB Attack Release Threshold Advanced Name Range Multiband Release Slow Slow2 Med Med2 MFast MFast2 Fast Speech Multiband Release Slow Slow2 Med Med2 MFast MFast2 Fast B1 Compression T...

Страница 156: ...se controls to set independent frequency balances for music and speech page 3 5 MB Gate Multiband Gate Threshold control determines the lowest input level that will be recognized as program by OPTIMOD...

Страница 157: ...eduction meters Eventually you will see the gain increase in sync with the program Go further until you begin to hear noise modulation a puffing or breath ing sound the input noise in sync with the in...

Страница 158: ...f dynamic bass boost preventing unnatural bass boost Set towards 0 independ ent it permits frequencies below 100Hz the slam region to have maximum im pact in modern rock urban dance rap and other musi...

Страница 159: ...must be verified with listening tests to a wide variety of program material Because there are separate controls for music and speech page 3 5 you can set at tack times faster for speech to minimize lo...

Страница 160: ...prevents gain reduction in one channel from causing audible spectral modulation on the other channel However the additional stereo difference chan nel energy created by independent operation can adver...

Страница 161: ...carefully tweak a preset to com plement the program material being mastered OPTIMOD PC V2 provides important tools to allow a mastering engineer to fine tune the processing to complement the program...

Страница 162: ...Unless you will be using a large amount of compression for special applica tions set the MB GATE THRESHOLD to OFF G Adjust the 2B DRIVE control two band or MB DRIVE control five band to achieve the d...

Страница 163: ...larly if weak bass is not sufficiently boosted turn the BAND 2 1 COUPLING closer to 0 M Set the amount of peak limiting with the FINAL LIMIT control In general the less peak limiting you use the bette...

Страница 164: ...esets You can create custom factory presets that support LESS MORE functionality These presets will behave like Orban s factory presets Your 1100 s software has the ability to interpolate all 19 avail...

Страница 165: ...ome Orban factory presets use as many as six anchor pre sets From the OPTIMOD PC Control Application save each preset as a user preset in plain text unencrypted form naming it My Preset LMxxx where xx...

Страница 166: ...ed to remove LMxxx including the space before the L The example file name is MY PRESET orbf C Open MY PRESET orbf in a text editor D Edit the second line of the file as follows Preset Name MY PRESET s...

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