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GRASS VALLEY HCO-3931, User Manual

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GRASS VALLEY HCO-3931 User Manual Download Page 45

USER MANUAL 

HCO-3931  |  

45

  

3.4.8  The ALC panel 

Minimizing loudness differences between segments in a playout channel is an important issue in a world where 
multiple programs originating in different formats from different sources must be integrated seamlessly. The Automatic 
Loudness Control (ALC) option is the solution to this need.  It uses Grass Valley’s proprietary 

wideband

 ALC 

algorithm. 
 
Enabled when the HCO-3931-OPT-ALC option is provisionned, this feature supports up to four programs, depending 
on the channel configuration selected for each one (mono channel, 2.0 channels, 3.0 channels, 4.0 channels, 5.1 
channels and 7.1 channels).  
 
Note: The ALC works with PCM audio. If non-PCM audio like Dolby-E or AC-3 is fed to the card, it will be ignored and 
all the program channels will be bypassed to prevent interference with the other PCM audio channel 
 

3.4.8.1  Config tab 

 
An input shuffler allows any combination of the available channels to be used as inputs to each ALC program. 
 

 

 

Figure 27 

 

GV ALC panel, Config tab

 

Property 

Description 

Channels Per 
Program 

Select the number of channels per program.   

Global 
Configuration 

This sets the measurment units, the nominal value, as well as the window size for the ALC 
measurements configured in the 

PGM1-4

 tabs. Select the ALC standard to apply to the audio 

content of all programs:  

  EBU R128 

  A85  ITU-R BS.1770 

  ARIB TR-B32 

Summary of Contents for HCO-3931

Page 1: ...HCO 3931 12G 3G HD Change Over with Clean Switch User Manual 13 03066 010 AA M00 2020 08 20 ...

Page 2: ...e to the following terms and conditions Grass Valley hereby grants permission and license to owners of HCO 3931 to use their product manuals for their own internal business use Manuals for Grass Valley products may not be reproduced or transmitted in any form or by any means electronic or mechanical including photocopying and recording for any purpose unless specifically authorized in writing by G...

Page 3: ...t antistatique et assurez vous qu il est bien en contact avec la peau Connectez la pince de masse à une surface non peinte du châssis pour détourner à la terre toute tension électrostatique indésirable En l absence de bracelet antistatique déchargez l électricité statique de votre corps en touchant une surface métallique non peinte du châssis Pour plus de sécurité vérifiez périodiquement la valeur...

Page 4: ...romagnetic Compatibility Limits for harmonic current emissions EN61000 3 3 2013 Electromagnetic Compatibility Limits of voltage changes voltage fluctuations and flicker EN55103 2 2009 Environment E2 Electromagnetic Compatibility Product family standard for audio video audio visual and entertainment lighting control apparatus for professional use Part 2 Immunity WARNING This equipment is compliant ...

Page 5: ...iate European EMC standards In order to achieve this performance in real installations it is essential to use cables and connectors with good EMC characteristics All signal connections including remote control connections shall be made with screened cables terminated in connectors having a metal shell The cable screen shall have a large area contact with the metal shell SIGNAL DATA PORTS For uncon...

Page 6: ...Edge Status LED 17 Local control using the Densité frame control panel 18 Remote control using iControl 19 3 4 1 The iControl graphic interface window 20 3 4 2 The Switch Control panel 22 3 4 3 The Probes Panel 26 3 4 4 The Switch Configuration panel 38 3 4 5 The Preview Configuration panel 41 3 4 6 The Timing panel 42 3 4 7 The Reference panel 43 3 4 8 The ALC panel 45 Test Panel 50 3 5 1 The Fac...

Page 7: ...es to be triggered The HCO 3931 provides two 12G 3G HD outputs Program PGM and Preview PVW Each output is available on two connectors signal copy The PVW output is user selectable to follow the main PGM output or any of four video inputs Grass Valley s next generation 16 channel automatic loudness control ALC option HCO 3931 OPT ALC can eliminate objectionable loudness variations between programs ...

Page 8: ... with relay backups o HCO 3931 3DRP H double rear with active bypass for a minimum of 48 hours of protection from a power loss Automatic change over mode using internal signal analysis with configurable probes for all inputs Manual change over by local frame controller iControl GV Orbit or GPI Alarm reporting to iControl GV Orbit facility monitoring and control system iControl and GV Orbit for con...

Page 9: ...Supported Video Formats The HCO 3931 supports the following video formats Figure 1 Supported Video Formats Block Diagram The following block diagrams show the functionality of the HCO 3931 Figure 2 Functional Block Diagram HCO 3931 ...

Page 10: ... ALC processing can be enabled with the HCO 3931 OPT ALC license Front Card edge Interface The front card edge of the HCO 3931 incorporates two elements Status LED see section 3 2 Select Button see section 3 3 Figure 3 Front card edge layout HCO 3931 Select Status Status LED SELECT button ...

Page 11: ...th the card out of the frame 1 If a card is installed in the slot for which the rear connector panel is being changed it must be removed Tilting the swivel handle on the front of the card to lever the connectors apart and then use the handle to pull the card straight out of the slot 2 Remove the existing rear connector panel either blank or belonging to an existing card that is being changed by re...

Page 12: ... latching bypass relay that provides 48 hours minimum retention from a power failure for the PGM A output signal with the MAIN or BACKUP input selection HCO 3931 3TRP HR Triple width Densité 3 rear HD DIN connectors This passive rear features a hardware based latching bypass relay that provides unlimited retention from a power failure for the PGM A output signal with the MAIN or BACKUP input selec...

Page 13: ...R Double slot width panel Triple slot width panel Hardware Bypass Latching Relay unlimited retention Electronic Bypass Latching Relay minimum 48 hour retention CONNECTORS HD BNC HD BNC REF IN 12G 3G HD IN MAIN BACKUP EMERG 1 EMERG 2 12G 3G HD OUT PGM A PGM B PVW A PVW B CONNECTORS HD15 HD15 GPIO ...

Page 14: ... backup channel EMERG 1 The emergency 1 channel EMERG 2 The emergency 2 channel OUT Serial Digital Video Outputs The HCO 3931 provides four 12G 3G HD SDI video outputs conforming to the SMPTE ST 2082 10 standard for 12Gbps signals SMPTE 292M standard for HD input signals or SMPTE 425M for 3Gbps signals to the BNCs labeled 12G 3G HD SDI OUT PGM A PGM B The main on air video output A latching bypass...

Page 15: ...O 3931 include a GPIO interface that allows control of the switch process When connecting the HCO 3931 to an automation system be aware of the following 1 The HCO 3931 card senses the presence of an external power supply voltage on the GPIO input Any voltage greater than 1 V will silence the GPI Connector Power alarm when this alarm is enabled 2 GPIO inputs trigger on a momentary pulse To be recog...

Page 16: ...ch output is selected 0 indicates selection Read the GPI OUT AUTO and GPI OUT BYPASS pins to determine whether either of these modes is in operation 0 indicates selection Note When a GPIO input is triggered the card switches to the input selected by the GPIO input It may then change operating mode depending on the GPIO input selected the card s switch configuration see 3 4 4 The Switch Configurati...

Page 17: ...d on the HCO 3931 affect the LED status If a cell is gray the error condition cannot cause the LED to assume that status If more than one LED status is possible for a particular error condition the status is configurable See Section 3 7 Alarm Config Panel on page 57for details The factory default status is shown by a The LED will always show the most severe detected error status that it is configu...

Page 18: ... Local control using the Densité frame control panel There are two types of local control panel Panel type Frame models Appearance Physical Densité 2 Densité 3 Densité 3 FR1 Touch screen Densité 3 FR4 The local control panel is fastened to the front of the controller card The physical panel is accessed by opening the front door of the frame The touch screen panel is accessed through an aperture in...

Page 19: ...To assign the local control panel to the HCO 3931 Physical Panel Push the SELECT button on the HCO 3931 card edge see Section 1 5 Touch screen panel In the home screen touch the virtual button corresponding to this HCO 3931 The STATUS LED on the HCO 3931 flashes yellow and the touch screen status shows yellow for the HCO 3931 Use the control panel buttons to navigate through the menu as described ...

Page 20: ...series of seven icons that report the status of some card parameters Figure 7 shows the various forms that may appear their meaning is described below Icon 1 Control status A Green Remote Control through iControl B Yellow Local control using the menu Icon 2 Reference status A Green Locked to external reference B Red Reference is missing C Grey Using an SDI input as Reference Icon 3 Input MAIN stat...

Page 21: ...the cursor over an icon to display its status message Error message cycling will resume when the cursor is no longer over an icon 2 The left hand side of the panel contains a series of buttons that control the contents of the main window section 4 Click on one to access the indicated controls The selected button is highlighted darker and the main panel heading matched the button name 3 At the bott...

Page 22: ... operation selected from the buttons in the Switch Control panel Clean switching is enabled by selecting the Clean Switch Enabled checkbox This activates the Timing panel where the clean switch timing requirements can be set up See 3 4 6 The Timing panel on page 42 Figure 8 Switch Control panel ...

Page 23: ...atic switch Auto switch uses signal analysis probes to determine whether the best input to be selected Figure 9 Automatic Switch Mode Click the Automatic mode button to set this mode The automatic operating mode parameters are shown above ...

Page 24: ... The graphic on the page shows which input is currently active 1 Click one of the available sources MAIN BACKUP EMERGENCY 1 and EMERGENCY 2 for a different source The selection shows green and the Take button is activated appearing red 2 A countdown from 10 seconds underneath the Take button shows how long the Take button will remain active before it times out 3 Click the Take button while it is a...

Page 25: ...o audio metadata analysis The bypassed HCO 3931 card is electrically disconnected from the Densité signal system and can be removed from the frame with no discontinuity in the signal path NOTE Grass Valley recommends that you set the HCO 3931 in BYPASS mode before removing it from the Densité frame to ensure no disruption in the signal when the card is removed and reinserted The Operating Mode can...

Page 26: ... used to decide whether the input must be switched in Auto mode It is also used to flag the status of the card in the iControl system A range of parameters are probed and you assign a weight High Low or None to each parameter for each input This weighting informs the card s decision logic to automatically switch an input Figure 12 Probes panel Video Tab No Video ...

Page 27: ...frame rate and the reference format s frame rate 3 4 3 6 Video tab Reference Mismatch Probe on page 34 Audio Grp 1 2 3 4 This probe detects the absence of audio in the named group See 3 4 3 7 Audio tab Audio Grp 1 2 3 4 Probe on page 35 Silence CH1 16 This probe flags the continuous absence of sound level in the specified audio channel for a specified duration See 3 4 3 8 Audio tab Silence CH1 16 ...

Page 28: ...ime delay Duration or Set Duration o A threshold level has been met Threshold o A signal restored time delay Clear Duration Duration Set Duration Set the probe s outage time required to trigger the probe to filter transients See also the description for the specific probe for more information Threshold Set the probe s threshold level has to be met to trigger the probe to filter transients See also...

Page 29: ...is probe is always Enabled for MAIN and BACKUP and the level set to High Low or None The factory default value is High Figure 13 Probes panel Video Tab No Video Probe Use the slider to set the duration for which the outage must continuously exist before the probe is triggered The nominal range of durations is 0 to 5 seconds In AUTO MODE if switching is not desired when Input MAIN changes video for...

Page 30: ...s soon as the threshold is encountered This probe is always Enabled for MAIN and BACKUP and the level set to High Low or None The factory default value is High Figure 14 Probes panel Video Tab Video Error Probe Use the slider to set the number of signal errors allowed over a 1s window before the probe is triggered See also 3 4 3 The Probes Panel on page 26 for more information about the configurat...

Page 31: ...robe Property Description Threshold mV Sets the signal level below which Black will be considered to have been detected Set Duration sec Sets the time interval over which Black must be continuously detected before the error is flagged Clear Duration sec Sets the time interval during which a non black signal must be continuously detected before a previously flagged Black error will be cleared See a...

Page 32: ...g on the signal characteristics A higher threshold value will be more tolerant to video noise than a lower value and the card may not be able to detect the freeze in presence of changing pixels If you want to detect a pure digital video freeze you can use the value zero Otherwise the threshold should be increased until a consistent freeze is detected Set Duration sec Sets the time interval over wh...

Page 33: ...el This probe compares this with the actual format detected at the input and the probe triggers if they do not match Figure 17 Probes panel Video Tab Format Mismatch Probe Property Description Expected format Set the expected format for each input See also 3 4 3 The Probes Panel on page 26 for more information about the configuration parameters ...

Page 34: ...obe detects if there is a difference between the input video format s frame rate and the reference format s frame rate Figure 18 Probes panel Video Tab Reference Mismatch Probe See also 3 4 3 The Probes Panel on page 26 for more information about the configuration parameters ...

Page 35: ... in the named group Figure 19 Probes panel Audio Tab Audio Grp Probe Property Description Duration sec Set the time interval over which loss of audio must be continuously detected before the error is flagged See also 3 4 3 The Probes Panel on page 26 for more information about the configuration parameters ...

Page 36: ... Audio Tab Silence CH Probe Property Description Threshold dB Sets the signal level below which silence will be considered to have been detected Duration sec Sets the time interval over which silence must be continuously detected before the error is flagged Note This probe works with PCM audio only See also 3 4 3 The Probes Panel on page 26 for more information about the configuration parameters ...

Page 37: ...ir previous values for example as they were before the checkbox was selected MAIN settings Apply to BACKUP Make all BACKUP probe parameters match those of the configuration for MAIN MAIN settings Apply to EMERGENCY 1 Make all EMERGENCY 1 probe parameters match those of the configuration for MAIN MAIN settings Apply to EMERGENCY 2 Make all EMERGENCY 2 probe parameters match those of the configurati...

Page 38: ...nput to use The automatic mode rules engine uses a weighting scheme to compute an input s health and determine the best input to use In this scheme Not all inputs are equal For example MAIN has a weight of 100 whereas EMERGENCY 2 has a weight of 50 The measured impairment of each input is factored into the evaluation For example an input with no impairment has a weight of 1 whereas an input with a...

Page 39: ...ates in Force switch to best input mode Default 5 seconds On Automatic Switch Event Set the behavior when an automatic switchover is triggered while the card is in automatic mode Switch and enter Manual mode Following an automatic switchover the card enters manual mode This is useful in situations where a switchover decision may be sign of serious problems in the upstream chain and you want to hav...

Page 40: ...he Automatic mode enable the inputs that can be used by automatic operation MAIN BACKUP EMERGENCY 1 and EMERGENCY 2 MAIN and BACKUP are always taken into consideration that is they cannot be ignored by the rules engine You can individually remove EMERGENCY 1 and EMERGENCY 2 from the rules engine so they will not be considered for an automatic switchover Any input can still be manually forced Bypas...

Page 41: ...iew outputs PVW A and PVW B show the signal at the card s EMERG 1 input EMERGENCY 2 The preview outputs PVW A and PVW B show the signal at the card s EMERG 2 input PROGRAM The preview outputs PVW A and PVW B show the signal at the card s PGM A B outputs Second Best The preview outputs PVW A and PVW B show the signal for the input with the current failover input to the main program output That is t...

Page 42: ...delay a 500 pixels dead zone area is at the end of this window The recommended practice is to set the output timing so that the input timing falls in the middle area of the 2 line buffer The timing panel graphic shows the inputs MAIN BACKUP EMERGENCY 1 EMERGENCY 2 and the output PROGRAM phase relationship represented by a black diamond marker with respect to the card s reference reperesented by a ...

Page 43: ... refresh rate of the reference found on the Densité frame s backplane Format Shows the current external reference s video format Selected Reference Shows the current reference used by the card Source Shows the card s current reference source Format Shows the card s current reference format Locked Shows the card s current reference locked state Green The preferred reference source is being used by ...

Page 44: ...ound on the Densité frame s backplane when its refresh rate is 29 97 Hz 25 Hz Use the the reference signal found on the Densité frame s backplane when its refresh rate is 25 Hz See the Timing panel section 3 4 4 for a display of the measured timing between the outputs and the reference and to set the output timing Note that the card de activates clean switch even if enabled in the current configur...

Page 45: ...3 0 channels 4 0 channels 5 1 channels and 7 1 channels Note The ALC works with PCM audio If non PCM audio like Dolby E or AC 3 is fed to the card it will be ignored and all the program channels will be bypassed to prevent interference with the other PCM audio channel 3 4 8 1 Config tab An input shuffler allows any combination of the available channels to be used as inputs to each ALC program Figu...

Page 46: ...ss monitoring When Enable Loudness Monitoring is set the loudness meters display the program input loudness before ALC processing Input LKFS LUFS the dynamic correction applied by the ALC Dynamic Regulation the ALC limiter correction ALC Regulation and the program output loudness after ALC processing Output LKFS LUFS The input and output loudness are given in LKFS or LUFS depending on the selected...

Page 47: ...ion Input Compressor The Input Compressor reduces the dynamic range of a signal and is independent from the ALC and can be activated separately All signal levels above the specified threshold are reduced by the specified ratio When the signal level exceeds the threshold the compressor will begin smoothly to reduce the gain following the attack time until the output level reflects the specified com...

Page 48: ...sing this pulldown where the available range is 10 to 31 for all operating modes See Figure 29 for the time domain response of the ALC ALC Pre Amp Level A pre amp stage is available in front of the ALC to compensate for programs having an input loudness out of the ALC tracking range very low or very high input loudness The pre amp level ranges from 20 dB to 20 dB in steps of 1 dB Response Time Out...

Page 49: ...ALC panel PGM tab Limiter Threshold Fast Mode Threshold Transient Threshold Transient Threshold Gate Threshold Output Target Fast Time Transient Time ALC Response Time Transient Time ALC Response Time ALC Response Time Freeze INPUT OUTPUT ...

Page 50: ...ow the format setting Audio Generate a 1 KHz sine wave at 18dBFS on all audio channel outputs Continuous tone on right channel pulsed tone on left channel of every pair 250 ms pulse every 3 seconds Audio inserted on Quad Link 3G link 1 only Metadata blank except for VPID on SDI output Format Set video test pattern format for 3G Quad Link 3G and 12G Video outputs SDR BT 709 75 75 Color bar with 75 ...

Page 51: ...L HCO 3931 51 Status When Test mode is activated on a channel the status icon display for that channel will show the Color Bars Tone icon Test Pattern Operating Mode Icon Enabled Color Bars Tone Disabled Process ...

Page 52: ...ry button on page 54 Profiles See 3 6 3 Profiles on page 54 Figure 31 Factory Presets Panel At the bottom left of the window the Current Preset field displays the presets that are currently used on the HCO 3931 application Possible values are Factory default User defined presets for example USER 1 User custom when a setting has been modified from a defined preset or factory default settings ...

Page 53: ...ncel the load Figure 32 Load User Settings Confirmation Box Click Save to store the current parameter settings and values from the HCO 3931 in the selected user preset The existing contents of the preset will be overwritten A confirmation box will pop up to allow you to proceed or cancel the save Figure 33 Save Configuration Confirmation Box You can edit the name assigned to each user preset Click...

Page 54: ... are not reset 3 6 3 Profiles Use Profiles to save or recover the entire card configuration including user presets if desired on an external disk or to copy it to another HCO 3931 card located in any Densité frame in the system Click Profiles to open the Profile Copy window Figure 35 Profile Copy for Card Copy profile from This line shows the HCO 3931 card and its App server Densité frame slot num...

Page 55: ...er selecting which profiles to save click this button to open a Save dialog Specify a file name and location to which the selected profiles for this card will be saved Note It is a good idea to create a folder for these files because they are not explicitly identified as HCO 3931 profiles and will be difficult to identify if not clearly named and conveniently located Click Save once the name and l...

Page 56: ...s app server Densité frame slot number card type and firmware version The Profile column shows the same setting as selected for the current card in the Copy profile from line See Figure 36 The Select column includes a checkbox to identify the HCO 3931 cards to which profiles will be copied from the current card For convenience a Select all checkbox is provided in the column header Click Copy to co...

Page 57: ... a status icon Card LED Overall Alarm and GSM Contribution These columns contain pulldown menus used to set the severity level of each individual alarm to the alarm named in the column heading This can be set independently for Card LED Overall Alarm and GSM Contribution Card LED This column is used to set the severity level of the selected individual alarm to the status LED located on the front ca...

Page 58: ...ge icon The alarm is of critical importance red icon The alarm exists but has no effect used for text and composite alarms Note As a shortcut you can click one of the Set All boxes beside a section heading to open a pulldown menu that lets you assign a level to all alarms in that section of the column simultaneously Once the alarms are configured you may accept the changes or discard them Overall ...

Page 59: ...settings Get alarm keys Click this button to open a save dialog where you can save a file containing a list of all alarms on this card and their current values along with an alarm key for each The alarm keys are useful for system integration and troubleshooting The file is saved in csv format OK Apply Cancel OK Accepts the settings and closes the window once the card confirms that there are no err...

Page 60: ...nfo control panel Label Enter the label that appears for the HCO 3931 application in iControl applications Short label Enter the short form label sometimes used by iControl 8 characters Source ID Enter a descriptive name for the HCO 3931 application Comments Enter any desired text The remaining data boxes show manufacturing information about the card Figure 43 Info Panel Three buttons in the panel...

Page 61: ...USER MANUAL HCO 3931 61 Advanced Shows the Long ID for this card The Long ID is the address of this HCO 3931 application on the iControl network Figure 45 Advanced Window ...

Page 62: ...0 2160p59 94 2160p50 Cable length Belden 1694A HD 180m 590 ft at 1 485 Gb s 3G 100m 328 ft at 2 970 Gb s Cable length Belden 4794R 12G 30m 98 ft at 11 88 Gb s NOTE Cable length specifications are for worst case scenario when outputs are protected by the active bypass or relay Reference Input Physical 1 HD BNC connector Standard SMPTE ST 170 SMPTE ST 318 ITU 624 4 blackburst Return loss 35 dB up to...

Page 63: ...abled Maximum of 2 5 lines with Clean Switch or ALC enabled Audio Processing Performance Quantization 20 24 bits Sampling 48 kHz synchronous Number of channels 16 4 groups Audio latency 1 8 ms without Clean Switch and ALC enabled Add 42 µs if Clean Switch is enabled Add 21 µs if ALC is enabled Electrical Power 15W maximum ...

Page 64: ... 4148 To obtain a local phone number for the support center nearest you please consult the Contact Us section of Grass Valley s website www grassvalley com An online form for e mail contact is also available from the website Corporate Head Office Grass Valley 3499 Douglas B Floreani St Laurent Quebec H4S 2C6 Canada Telephone 1 514 333 1772 Fax 1 514 333 9828 www grassvalley com ...

Page 65: ...16 AUDIO GROUP PRESENCE 1 t0 4 INPUT FORMAT NO VIDEO VIDEO ERROR FORMAT MISMATCH TIMING ERROR REF MISMATCH BLACK ERROR FREEZE ERROR SILENCE CHANNEL 1 to 16 AUDIO GROUP PRESENCE 1 t0 4 USER 1 USER 5 USER 1 USER 5 AUTO MANUAL BYPASS MAIN BACKUP EMERGENCY1 EMERGENCY2 AUTO EXT URS OFF 29 97 HZ 25 HZ HCO 3931 XXX ALL PARAMETERS ALARMS PRESETS Sets all parameters shown above to their underlined default ...

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