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Snell & Wilcox Prefix Cpp100, Руководство оператора

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CPP100

SECTION 9

CPP1OPS

25/10/06

www.snellwilcox.com

Version 1 Issue 6

9.22

Enhancer cont.

Mode - Video Mode

The aim of the video mode is to reduce the temporal bandwidth of video source material by pre-filtering and
temporal sub-sampling. Temporal sub-sampling reduces the number of fields that contain picture differences,
which in turn increases the encoding efficiency.

 Mode 1

In Mode 1, a single input field is filtered to produce two output fields.  Two different apertures are used for the
input field (skewed by one field) and the output is generated by switching between the two filters at field rate.

Mode 2

In Mode 2, two input fields are combined using a vertical temporal filter to produce two output fields.
Although  mode  2  attenuates  high  frequency  diagonals  more  than  mode  1,  it  has  no  25Hz  temporal  flicker
component as both input fields are identically filtered.

Filter 1

Filter 2

Field
switch

Содержание Prefix Cpp100

Страница 1: ...www snellwilcox com Snell Wilcox Ltd Southleigh Park House Eastleigh Road Havant Hants PO9 2PE United Kingdom For General Enquiry s contact Tel 44 0 2392 489000 Fax 44 0 23 9245 1411 For Technical ass...

Страница 2: ...s befinden sich keine vom Benutzer zu wartenden Teile im Ger teinneren Dieses Ger t sollte nur von geschultem Personal gewartet werden Um das Risiko eines Elektroschocks zu reduzieren setzen Sie das G...

Страница 3: ...Om enheten har tv huvudsakliga elf rs rjningar s kerst ll att b da str mkablarna som r inkopplade i enheten arbetar fr n samma fas S CAUTION RISK OF ELECTRIC SHOCK DO NOT REMOVE COVERS NO USER SERVIC...

Страница 4: ...menta o com ficha IEC f mea standard num extremo e uma ficha IEC macho standard no extremo oposto Se for necess rio substituir ou alterar alguma destas fichas dever remove la e elimina la imediatament...

Страница 5: ...he supplier immediately Enclosures CPP100 PREFIX Unit Power cable Operator s Manual Product Type This manual is for use the following product variants CPP100 1 CPP100 noise reducer Digital component i...

Страница 6: ...Top Level 5 1 Filter Menu 5 2 Video Analysis 5 3 Video Menu 5 4 Decoder Menu 5 5 Genlock Menu 5 5 Monitor Menu 5 6 Memory Menu 5 7 Quick Menu 5 7 System Menu 5 8 6 Operation General 6 1 Front Panel Co...

Страница 7: ...on 7 2 Rolltrack 7 3 8 Specifications 9 Appendix 1 Recursive Filtering 9 1 Median Filtering 9 6 Spatial Filtering 9 8 Linear Filters 9 10 Scratch Filter 9 15 Enhancer 9 17 10 Appendix 2 Status and War...

Страница 8: ...ng monitored System Please provide a brief description of the system in which your S W equipment is currently being used Basic Tests Preset Unit Please use the Preset Unit function to return the setti...

Страница 9: ...pe Video Products i e Modular Kudos Plus and Alchemist Unit Serial Number Fault Spare Part Information please advise us how many units show this fault and the system layout showing all other manufactu...

Страница 10: ...n No Issue No Change Comments 090298 1 1 First Issue Software Version 1 42 020398 1 2 Page 2 2 Input and output data New section 2 issued 1 3 Not issued 280199 1 4 For latest software version 1 5 2605...

Страница 11: ...he level of enhancement can be subjectively selected by the user to suit the bandwidth of the material and coring facilities ensure that low level noise is not enhanced Residual subcarrier and cross e...

Страница 12: ...gital or analogue Seven Filters Recursive filter Unique filter biasing and motion adaption algorithms Semi transversal filter Enhances Recursive filter performance Increases Overall noise reduction Me...

Страница 13: ...CPP100 SECTION 1 CPP1OPS 25 10 06 www snellwilcox com Version 1 Issue 6 1 3 I O Interconnection Subject to the options fitted the following I O rear panel connections will be available...

Страница 14: ...mposite inputs up to two serial digital component SMPTE259M C inputs can be applied directly to the pre processor Source switching between digital inputs is accomplished on the pre processor card An a...

Страница 15: ...ansversal filter is a uniquely patented design that operates in conjunction with the recursive filter to increase its effectiveness Quite unlike traditional transversal filters it operates by selectin...

Страница 16: ...he recursive and transversal filters spatial noise reduction can increase the overall noise reduction level Linear Filters A suite of linear filters allows fine control of the horizontal bandwidth of...

Страница 17: ...at the high setting Purely horizontal frequencies remain unfiltered Three decoder matching settings are provided Line Comb Field Comb and Other The purpose of each of these filters is to provide comp...

Страница 18: ...t If a PREFIX is to be mounted in a rack together with convection cooled equipment e g Analogue distribution amplifiers ensure that it is not located above or interspersed with these units The equipme...

Страница 19: ...d B accept digital component signals These inputs can be selected from the menu by choosing the SDI A or SDI B option Not that this interface is in accordance with SMPTE 259M C ITU recommendation BT 6...

Страница 20: ...een display Note that Error Detection and Handling EDH is only implemented on the program output Note To aid compliance with EMC RFI regulations we recommend the use of high quality co axial cable typ...

Страница 21: ...CPP100 SECTION 3 CPP1OPS 25 10 06 www snellwilcox com Version 1 Issue 6 3 1 Block Diagram...

Страница 22: ...opening the panel is to use your thumbs to release the catches and then ease the panel sufficiently forward Turn the unit on The green LED to the left of the ON OFF switch should be illuminated and th...

Страница 23: ...s on the analogue input Noise Reducer The right hand pair of LEDs indicates the condition of CPU A The GREEN LED flashes when the CPU is in normal operation The RED LED illuminates on power up and if...

Страница 24: ...to the RollCall remote control port D5 D6 D7 D8 These indicate that the 6 V 5 V 6 V and 5 V power supplies are present D9 INPUT This indicates the presence of a decoder composite input D10 REF This in...

Страница 25: ...atus H Lock V Lock Decoder D Comp I P Pic Posn Dec Mode Proc Amp Blk Trk Col Filt Comb Mode Vert Adap Pedestal Monitor Status Display Display Style Panel Display EDH Status EDH Reset Key Window Loggin...

Страница 26: ...s Luma Off Min Med Max Preset Threshold Auto 0 15 Preset Bias 3 to 3 Preset Chroma Off Min Med Max X Colour Preset Enhancer Mode Enhancer Mode Off Enhance MPEG De Enhance Decoder Match Video Filter Mo...

Страница 27: ...old Seq Offset Flag 0 Flag 1 Flag 2 Flag 3 TTL Flags Off Shot Change Adv Shot Change Repeat Field 3 2 Seq bit 2 3 2 Seq bit 1 3 2 Seq bit 0 Seq Change Single Field Not Film First Field Shot Change Adv...

Страница 28: ...B Freeze SDI I P Video Comp I P Message Black EBU Bars Y Ramp UV Ramp Y Sweep UV Sweep Bowtie Full Bars V Std 525 only OVD OBD ABD VITS All Select Mode All All On All Off User Cfg Mode Comp I P Decod...

Страница 29: ...Trk Col Filt Comb Mode Vert Adap Pedestal NTSC only on G version Pic Posn 0 ns Preset Dec Mode Decode Comp Proc Amp Black Vid Gain C Gain Hue Black 0 mV Preset Vid Gain 0 dB 100 G Preset C Gain 0 dB 1...

Страница 30: ...Recursive Median Spatial Linear Scratch Enhancer EDH Check Network Auto Loop Display Style Black White White Black White Clear EDH Reset AP Reset FF Reset Reset Both Border Off Black White Key Window...

Страница 31: ...ll Preset Recall User Store User Set Name Set Name As Factory Preset Satelite Noise Film Artefacts Video Artefacts F V Artefacts MPEG Lo bps Fil MPEG Med bps Fi MPEG Hi bps Fil MPEG Lo bps Vid MPEG Me...

Страница 32: ...wilcox com Version 1 Issue 6 5 8 System Menu Character set for Net Name and Memory Name System Net Address Net Name Version G Version Serial No Net Address 20 h Preset Net Name CPP100 20 Preset Versio...

Страница 33: ...of different means Local front control panel Remote Shoe Box Computer Interface Card Edge Control not available on G version When using a Remote Shoe Box or the computer interface communication is vi...

Страница 34: ...where the front panel can be locked out This may be useful where accidental depression of one of the control buttons could occur or where the unit will be under remote control To enter this mode press...

Страница 35: ...FIG buttons on the front panel can be used to access and control the set up and configuration of the unit Button Press Press and Hold INPUT Goto Video Source menu No Action SETUP Goto Video menu Goto...

Страница 36: ...tly from the front panel by pressing the REC button The Semi Transversal Filter can be turned ON OFF directly from the front panel by pressing the TRANS button Note The Semi Transversal filter can onl...

Страница 37: ...OFF directly from the front panel by pressing the SPATIAL button Spatial Luma Level Range Off Min Med Max Preset Min Spatial Chroma Level Range Off Min Med Max Preset Min Scratch This is the top level...

Страница 38: ...l CutOff The Brickwall filter has two sets of low pass filters The first set of Low Pass LP has a variable boost available The second set of Extra Low Pass ELP filters has a fixed level of boost Low P...

Страница 39: ...nhancer operating mode The default mode is Enhance Enhancer Enhance Luma Level Range Off Min Med Max Preset Min Chroma Level Range Off Min Med Max Preset Min Luma Coring Range Off Min Med Max Preset O...

Страница 40: ...satellite transmission failures To limit the bandwidth of the picture to a level commensurate with the MPEG encoder bit rate To generate video analysis information which a downstream MPEG encoder can...

Страница 41: ...ween fields which originate from the same film frame On the other hand video originated material which has individual fields representing different points in time has no frame correlation Nevertheless...

Страница 42: ...5 10 06 www snellwilcox com Version 1 Issue 6 6 10 Advanced Shot Change The shot change flag can be advanced by up to 5 fields in 1 field increments to allow downstream equipment to prepare for the oc...

Страница 43: ...525 film originated material The five field sequence can be further identified by a specific code for each field in the sequence In the example shown below a 3 bit code running from 0 to 4 is used to...

Страница 44: ...ic edit to a film originated master is shown below In this case the edit has caused a discontinuity in the sequence count resulting in the counter value changing from a 2 back to a 1 at the edit point...

Страница 45: ...nerate a mixed output if fields corresponding to sequence counts 1 and 2 were treated as though there were from the same film frame To prevent this a single field flag is generated which indicates to...

Страница 46: ...rsion 1 Issue 6 6 14 First Field Flag The first field flag indicates the first field of a film frame as shown in the example below for 525 film originated material In this case the first field flag wi...

Страница 47: ...fields are required as the resulting frame rate of 25Hz is exactly correct for the 625 line standard The frame pairs are identified by analysis of field differences Film originated material has a hig...

Страница 48: ...owever has no such frame correlation A single line is used to indicate film video origination and is provided at the start of each field If the material contains mixed film and video originated materi...

Страница 49: ...rietary algorithm is used to measure input noise floor level This is used internally to control operation of the median recursive and de enhancement filters and can be passed out along with the other...

Страница 50: ...s been designed to embed ancillary data as type 1 utilising a single data ID for identification of the ancillary data packet Packet Structure The structure of the packet data follows the convention la...

Страница 51: ...s shown bits b7 MSB b0 LSB form the identification value 00h FFh bit b8 is even parity for b7 b0 bit b9 not b8 DID words Some DID words such as EDH are Internationally Registered and are unavailable f...

Страница 52: ...uce a zero sum themselves and produce no carry bit User data words UDW All user defined words can be described as bitwise utilising bits 2 through 7 with bit 8 defined as parity and bit9 set to NOT bi...

Страница 53: ...ag 9 b8 8 parity 7 single field flag Film I 1 6 sequence change 5 shot change 4 sequence count bit 2 3 sequence count bit 1 2 sequence count bit 0 Film Group II Group Word Bit Flag 9 b8 8 parity 7 0 F...

Страница 54: ...l high 3 Spatial C level med 2 Spatial C level low 9 b8 8 parity 7 Linear Mode Brickwall 3 6 Linear Mode Gaussian LP 5 Linear Mode Gaussian HP 4 Linear Filter set bit 5 3 Linear Filter set bit 4 2 Lin...

Страница 55: ...0 0 UDW 1 b8 parity Film group 1 0 0 UDW 2 b8 parity Film group 2 0 0 UDW 3 b8 parity Noise Floor 0 0 UDW 4 b8 parity Status 0 0 UDW 5 b8 parity 0 0 UDW 6 b8 parity 0 0 UDW 7 b8 parity 0 0 UDW 8 b8 pa...

Страница 56: ...ine pin D type is used to provide 4 control outputs which can be mapped to each of the following flag signals Analysis Flags Shot Change Advance Shot change Repeat Field Flag 3 2 Sequence bit 2 3 2 Se...

Страница 57: ...described in earlier sections of this document In situations where electronic editing has reduced an original film pair to a single field an additional single field flag is required to indicate that t...

Страница 58: ...The DEFT output format is not a recognised method of embedding ancillary data and hence should only be used with DEFT equipment Moreover as there is no explicit method of avoiding illegal TRS codes do...

Страница 59: ...rmal shipment configuration but can be accessed by configuring the unit in debug mode using SW4 2 and enabling this option through the configuration menu In this case the CPUB LED s D18 and D19 are re...

Страница 60: ...the available sources If the optional decoder card is fitted option D or G then four options are available D Option Comp A Comp B SDI A SDI B Default Comp A G Option as D plus Dig Comp Parallel Standa...

Страница 61: ...nformation will be passed In order to preserve closed caption information which may be transmitted on lines 20 to 22 an additional setting has been provided which affects these lines only ABD Addition...

Страница 62: ...ve VITS processing The following options are available All On Pass all VITS lines All Off Blank All VITS lines User Cfg Selectively Blank VITS lines Default All On When the User Cfg option is chosen t...

Страница 63: ...ie Black level Range 20 mV to 20 mV Step 0 2 mV Preset 0 mV Hue this allows adjustment of the NTSC hue control Standard G version Range 180 o to 180 o 179 Step 0 5 1 Preset 0 o 1 Black Track not on G...

Страница 64: ...orrection and decoding are optimised to give maximum performance from LaserDisk sources VHS In this mode the timebase correction and decoding modes are optimised to give maximum performance from VHS a...

Страница 65: ...ected input to be referenced to a signal of the same line standard The menu system allows the synchroniser to be switched such that the genlock mode is on or off Genlock Off When the genlock is forced...

Страница 66: ...Using the Synchroniser Prefix contains a frame synchroniser which is essentially just a variable delay which has a little in excess of 1 frame capacity The purpose of the variable delay is to allow e...

Страница 67: ...always free running Monitor Menu The On Screen Status Display can be turned ON OFF directly from the front panel by pressing the MON button Status Display To go directly to this menu PRESS and HOLD th...

Страница 68: ...ve Picture and Full Field error second counts use the Panel Display or Status Display The EDH error second count can be reset in the EDH Reset sub menu When the H Split key window is selected EDH chec...

Страница 69: ...rent memory name is displayed on the second line If any setting is different to that memory either Modified or Mod will be added to the end of the name to show that the current configuration is a modi...

Страница 70: ...lling the Film Artefact preset memory will not change the decoder or video set up only the filters will be changed The Preset memories are Satelite Noise Film Artefacts Video Artefacts F V Artefacts M...

Страница 71: ...de Off Strength Med Contrast Med Length Long Type Both Width Narrow Mode Enhance Y Min C Min Y Core Min C Core Min 3 Video Artefact Y Med C X colour Threshold Auto Bias 0 On Level Med 3 Y Min C Max Mo...

Страница 72: ...kwall Cutoff 4 2MHz Boost 0dB Off Mode MPEG De enhance Y Off C Min 8 MPEG low bit rate Video Y High C X Colour Threshold Auto Bias 0 On Level Max 5 Y Med C Max Mode Brickwall Cutoff 3 2MHz Boost 0dB O...

Страница 73: ...To do this PRESS and HOLD the NET button The system menu allows configuration of the RollCall network address and name The address can be changed in the Net Address sub menu The default is 20h the net...

Страница 74: ...can be programmed via the control buttons adjacent to the display These buttons give access to a number of menus which have been arranged so that progressively selecting the relevant item on any given...

Страница 75: ...t is available on request Basic RollCall Operation All the features from the menu system are available remotely with the same options structure This maintains compatibility and facilitates easy operat...

Страница 76: ...start with address 0x20 but the second unit to be powered on will find that 0x20 is in use by the first and so will set its address to 0x21 The third unit powered on will find both 0x20 and 0x21 in u...

Страница 77: ...he audio delay is then the sum of the individual delays introduced by the video units plus the manual delay of the audio unit The manual delay can be set to compensate for any fixed propagation delay...

Страница 78: ...tter than 17 dB at 270 MHz Reference Loop Analogue loop through input 1V pk pk 75 ohm impedance Signal Outputs SMPTE 259M C Outputs Output Return Loss 2 off Program Outputs 1 off Monitor Output Better...

Страница 79: ...5dB step Black level 20 mV 2mV step Manual or Automatic tracking Colour filters Wide medium narrow NTSC PAL M pedestal On Input has a pedestal Off Input does not have a pedestal NTSC hue 180 1 step Pi...

Страница 80: ...ter ON OFF Level Min 1 Min 2 Med 3 Med 4 Max 5 Max 6 Spatial Filter Spatial 2D median filter Filter ON OFF Y Off Min Med Max C Off Min Med Max Linear Filter 18 sets of linear 15 tap low pass brickwall...

Страница 81: ...524H 525 standards VITS Embedded V flag Style 525 line only All On All Off Select individual lines Individual line controls or Group control for blanking passing of VBIS lines 625 Standard 6 22 319 33...

Страница 82: ...ay information Normal Recursive Median Spatial Linear Scratch Enhancer EDH Check Network Auto Loop On Screen Display On screen status display using Monitor output None System Filters Decoder Memory St...

Страница 83: ...icture contributions are required to achieve a useful level of noise reduction Another consequence of this arrangement is that it introduces a substantial processing delay An alternative filter arrang...

Страница 84: ...plied to a stationary picture with picture contributions backwards into infinity In reality the level of noise reduction will be continuously modulated by picture differences such as shot changes or m...

Страница 85: ...etermines the sensitivity of the motion detector shown as a non linear transfer function below The control parameter for this function can be configured manually through the THRESHOLD adjustment or no...

Страница 86: ...nsitivity of the motion detector to moving chrominance will be reduced with the consequent possibility of chrominance smearing Threshold setting The recursive noise reducer has a threshold setting whi...

Страница 87: ...of reducing electronically generated or white noise in video or film sources Additionally it can be effective in reducing the level of film grain and to some extent film weave A typical range of setti...

Страница 88: ...l and spatial filters Problems can still occur with some moving textures and hence Prefix contains a matched filter algorithm which evaluates spatial and temporal gradients for each pixel to determine...

Страница 89: ...1OPS 25 10 06 www snellwilcox com Version 1 Issue 6 9 7 Operation Control parameters for the median filter can be found under the MEDIAN menu as shown below FILTERS MEDIAN MEDIAN LEVEL Min1 Min 2 Med...

Страница 90: ...filtered and this leads to a softening of the picture on edges and on textures Spatial Aperture comprising adjacent points on the same line and on adjacent lines above and below the central pixel The...

Страница 91: ...hown below The SPATIAL filter has separate controls for luminance and chrominance noise reduction levels Examples for use The spatial filter is complementary to the temporal noise filters such as recu...

Страница 92: ...wn to 2 5 MHz in 0 1 MHz steps The stopband performance is 34 dB or better with no boost In addition to the selectable cut off frequencies the user can also select a given boost at each cut off 0dB no...

Страница 93: ...CPP100 SECTION 9 CPP1OPS 25 10 06 www snellwilcox com Version 1 Issue 6 9 11 Linear Filters cont 0 1 2 3 4 5 6 Frequency MHz Amplitude 2 8 MHz Brickwall Filter with available boosts...

Страница 94: ...in the luminance signal such as inherent high frequency gain This mode has 10 user selectable levels at 6 75 MHz ranging from 4dB to 40dB in 4dB steps 0 1 2 3 4 5 6 20 15 10 5 0 Frequency MHz Gain dB...

Страница 95: ...selected The options available for each mode are as follows Mode Off Full Bandwith Mode Brickwall LINEAR Mode Cut Off Boost Low Pass Extra Low Pass 4 2 Mhz 4 1 MHz 4 0 MHz 3 9 MHz 3 8 MHz 3 7 Mhz 3 6...

Страница 96: ...ng for the linear filter is Off Full Bandwidth The factory default settings for each filter type are as follows Brickwall 4 2 MHz 0 dB Boost Gaussian LP 4 dB Gaussian HP 1 dB LINEAR Off Brickwall Gaus...

Страница 97: ...r off In order to remove scratches it is necessary to enable the scratch filter Strength There are three Filter Strengths available and they are denoted as Min Med and Max By increasing the strength o...

Страница 98: ...re is only one type of scratch i e white or black the Type option should be set to White or Black as appropriate This will aid in reducing the number of false alarms and thus result in improved pictur...

Страница 99: ...linear enhancement is able to enhance images without the large increase in overshoots and ringing that are associated with linear enhancement methods The non linear correction signal consists of a pe...

Страница 100: ...ptive filter The broad bandpass filter produces the highest enhancement levels at 3 375 MHz for luminance whereas the adaptive filter has the highest levels of enhancement over a broader range of freq...

Страница 101: ...ow The first stage of the luminance de enhancer is a seven point vertical temporal filter The vertical temporal filter is followed by a horizontal bandpass filter The effect of these two cascaded filt...

Страница 102: ...t stage is a seven point vertical temporal filter As well as attenuating high frequency diagonals the multi tap filter also suppresses cross colour originating from composite luminance and chrominance...

Страница 103: ...frequency luminance in chrominance and cross luminance residual chrominance in luminance are reduced in amplitude The line comb setting is used for decoders which utilise a line comb structure for Y C...

Страница 104: ...encoding efficiency Mode 1 In Mode 1 a single input field is filtered to produce two output fields Two different apertures are used for the input field skewed by one field and the output is generated...

Страница 105: ...e user to select between the four different filter options Enhance MPEG De enhance Decoder match Video Filter Selecting one of these options automatically turns the other three off and displays the ne...

Страница 106: ...option on either Setting both Luminance and Chrominance to OFF has the same effect as switching the Enhancer off Adjusting The Coring Level The enhancer has separate coring controls for luminance and...

Страница 107: ...controls It is possible to de enhance just luminance or just chrominance by selecting the OFF option on either Setting both Luminance and Chominance to OFF has the same effect as switching the de enha...

Страница 108: ...match option are as shown below Adjusting Video Filter Setting The video filter settings can be found by selecting the video filter option under the enhance mode menu The controls for the video filte...

Страница 109: ...rom artefacts such as overshoots if the enhancement level is set too high The main indication that the enhancement level is set too high is the effect of noticeable outlining around objects With the c...

Страница 110: ...rect Check that the source is valid This error should not occur if the standard is set to Auto 525 525 line SDI source signal 625 625 line SDI source signal PAL I PAL I composite video signal PAL N PA...

Страница 111: ...ccur briefly when a new unit is added to the network EDH EDH errors on SDI input Check upstream SDI equipment and cabling for errors or damage The above messages relate to causes which may indicate a...

Страница 112: ...ON 11 CPP1OPS 25 10 06 www snellwilcox com Version 1 Issue 6 11 1 Appendix 3 Network Address Table It is recommended that the following table be kept up to date with the units and their addresses Exam...

Страница 113: ...recognise the input signal standard EXTREF OK The Unit is genlocked to a compatible reference signal i e input signal and reference signal are the same video standard N A The Unit does not have a comp...

Страница 114: ...nt i e accumulative count of the number of seconds during which at least one EDH error occurred in the full field FAULT NONE Unit has not detected any internal malfunctions FAIL FAN FAIL VIDEO FAIL CO...

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