CA1122316A - Micro processor control for video synchroniser - Google Patents
Micro processor control for video synchroniserInfo
- Publication number
- CA1122316A CA1122316A CA295,969A CA295969A CA1122316A CA 1122316 A CA1122316 A CA 1122316A CA 295969 A CA295969 A CA 295969A CA 1122316 A CA1122316 A CA 1122316A
- Authority
- CA
- Canada
- Prior art keywords
- control arrangement
- picture
- arrangement according
- synchroniser
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/2628—Alteration of picture size, shape, position or orientation, e.g. zooming, rotation, rolling, perspective, translation
Abstract
ABSTRACT OF THE DISCLOSURE
A video control arrangement for a synchroniser includes a joystick for moving the T.V. picture in at least one plane to a first selected position. A memory arrangement receives and holds information on the location of the first preselected position which can be recalled later to effect automatic movement of the T.V. picture to this preselected position.
A video control arrangement for a synchroniser includes a joystick for moving the T.V. picture in at least one plane to a first selected position. A memory arrangement receives and holds information on the location of the first preselected position which can be recalled later to effect automatic movement of the T.V. picture to this preselected position.
Description
~ 3~
ACKGROUN~ TO THr I~ENTION_ The invention relates to synchronisers and more specifically to a video control arrangement for synchronisers.
Framestore synchronisers (e.g. Quantel DFS 3000) are now ~ell known in various parts of the television world for example North America and Europe (see also for example B,itish Patent No. 157il~ or U.S. Patent No. 4101939).
In the DFS 3000, the synchroniser has the facility of picture freeze within the frame store (see also for example British Patent No. 1568379 or U.S. Patent No.
4183058~. The facility of frame compression to produce quarter size pictures is provided (see also for example British Patent No. 1576117 or U.S. Patent No. 4152719).
Movement of the compressed picture may be effected by means of a joystick control.
OBJECT OF THE INVENTION
_ _ _ An object of the invention is to provide additional control facilities for the synchroniser which may be provided at a position remote from the synchroniser.
SUMMARY OF THE INVENTION
According to the invention there is provided a video -control arrangement for a synchroniser comprising positioning means for moving the posi~ion of a T.V. picture in at least one plane to a first selected position, memory means for receiving and holding information on the location of said first preselected position and for recalling the location oE th;s preselected position.
~6 ~ . .~ ~
112;~31~
~RI~ VES(;I~ll'i`I(~ Cl~ Di7~WI~l~S
rlhe invc~tion will now be descril~ed by wav of ex~mple with referel~ce to the ~ccompanyincr drnwings in whic~
Ii~ure 1 shos~s the ~nown synchroniser to which the control arr~ngement of the invention c~n be ~ttached;
ligure 2 shows typic~l ~anual controls of the unit;
I`i~ure 3 shows one arr-?ngetnent for presetting an~
rec.11lillg the im~C~e Jvsition in the control arrangement of t~Ie invention;
~ i~ure 1~ shows the joystick, updnte interval alld transitiorJ time controls; and Figure 5 sho~s an arrangement including a micro-processor f)r r~alising tlle functions of the Figure 2 arrangement .
~LSCIIIYTI~N OF I'l~ f301~ T~
.
The arrangement for t~e known DFS 300~) synchroniser is shown in ~igure 1. A video input is received by processin~ amplifier 10 w}lich feeds sync separator 11 controlling ~ write clock generator 12 ~hé clock ge~lerator output is received by an analogue to di~ital converter (ADC) 13 w~licll converts t~le video signal to digital form prior to storage in a fran~e store 14. The write clock generator 12 also has an output received by a store control 15 which controls the oper~tion sequence of the store 1~. The store output is received by di~ital to an~logue converter 16 w~lich is under the control of clocks from read cloc~ generator 17 receiving sync pulses from sync pulse ~ener~tor 1~. The analogue output of converter 16 is received by output processor 19 whicll provides tl~e composite video output of ~ 3~
the synchroniser. The sync pulse generator 18 is controlled by means of externally generated sub carrier and sync inputs directly or via an output sync separator 20 which receives a composite video signal.
The store control of the synchroniser has the facility of freezing the picture within the frame store (see also for example British Patent No. l568379 or U.S. Patent No.
4183058). The synchroniser has the facility of frame compression by only storing selected picture point samples so that if every other picture point is not stored (in both horizontal and vertical directions) a quarter sized picture is produced (see also for example Briti~h Patent No. 1576117 or U.S. Patent No. 4152719). The frame compressor 23 allows this compressed picture to be stored in any one of four quadrants by means of selectors 24- 27 which control the picture point counter addresses. In addition a joystick control ~8 is provided which allows the ~uarter size picture to be moved anywhere within the normal picture frame area by defining the pertinent varying address as the stic~ is moved.
The remote control arrangement 30 of the invention is connectable to the store control of the known synchroniser to provide the standard functions just described together with additional functions at a position remote from the synchroniser (e.g. in the studio mixer) by a distance of up to several hundred feet if required.
A typical layout for the manual controls of unit 30 is shown in Figure 2.
~aZ23~
A fr.3me freeze button 3l is provideti for 1'reezin~ captions.
~ l'ield freeze button 32 is ~rovidell for stop})in~ fast movinO o~jects on tt1e picture. In adc1ition an update control 31~ is provided whic1~ allows a varia~le update interval to be selected by t~1e proclucer to autome-tica]ly ul)da-te tbe frozen picture between a rate of say once per second -to infinity (i.e. hold).
~ 'ive preselect buttons 33 are providec1 for tl1e compressed picture position. '~'hese 'b11ttons no-t only select the compressed functi(-n when depressed but also have tl-e c~pability to memorize positions previously chosell at tl1e beginnin~ of the T.V. prpgramme so that these c~n be rec.~lled by the producer w11en required and thus nllow rehearsal of a programme prior to -transmission in the confidence t}1at when i.e ~30ves fro;n event to event on air the chosen se~uence will be faithfully reproduced. The chosen position is rec~lled merely by pressin~ the appropriate button and the cancellation of this effect to normal size and position is effected by depressin~-the appropriate button once again.
The memory facility is actuated during rehearsal in conjunction with 'live' button 36 and joystick positioner 37. The picture position is determined by v~lrying the joystick 37 with live button 36 depressed. If one of the preselect buttons 33 is also depressed the position of the joystick is reme;nbered for recall later.
It is also possible to move and memorise a full frarne of vicleo by melns of joystick 37 'by depressin~ live button 38 and one of t11e fixe preset bu-ttons 35 in a similar way to compressed frame. ~y only depressin~ the live button 36 or 38 it is possi'ble to rely only on live position 3:1~
control wit!out using ~ e presclect facilities of buttons 33 nd 35. Two buttons 40 and ~ re provicled to s~ tch off respectively the X and Y axes of the joystick to allow a smootll live single climenti-)nal pan or tilt.
A tr`nsition time control 42 is provided to allow the producer to selec-t the rate of pan or tilt from one ~-reselected position to anotler. The rate carl be varied typically from instantalleous to a time of several seconds.
Alternatively the rate of velocity tnay be varied.
An auto key button 45 is also provided. Thc auto key facility is prcvided to mclke life easier ior the ca~eraman.
The control is able to me sure the centrc of the cnroma key area tillen the chrom- key signal is fed into the s~nchroniser anll computes the ap~ropri.-te position -for the compressed iinage to be centrcd over the key signnl so t~lat if the calllera pans the compressed image automatically follows. Thus auto key is used ~here a chroma key signal is being fed to the synchroniser and the producer has ~pproximately centred a compressed picture o~er the key area using one ol the five preselector buttons. Pressing the auto key button 45 ~iill ensure that the compressed im~ge is automatically centred over the key area even if this key area should move. The various buttons described above may incorporate a lamp to cle~rly indicate tnclt a button is deT)ressed.
~ circuit arrlngement suitable for the compressed picture position presetting of ~i~ure 2 is shown in ~`igllre 3.
The position data from joystick control 37 can be passed via live switch 36 directly to the synchroniser so that ~lZ'~3~6 the joysticl; oper.1~,es itl ttle kno~Yn live mode. If llo~iever the preset switch 33 is closed, the position clata is fed into ~ ~lemory 50 ~ ere it is stored. \;~len -tbe position data is recallell this is passed to tile synchroniser to cause ~ovement to this position to ~e ilnplemented. Enter an(l recall l'or tlle meli]ory can l)e arrallOed to be actu<lted respectively ~ith the preset switch 33. The memory m~y be analoglle or digit~l depending on the type of ou-tput provirlell by tlle joystick and the synchroniser input. To provide the re~luirer~ents O.r tlle ~'igure 2 arrange~ent five SllCh switches 33 and memories 50 ~ould be required for the compressed pieture position and five similar arran~elDents f(~r the full frame position.
Although such a syst-e;n c~n be constr~lcted solely from lcnown har~ware elements it is more eonvenient to use a microprocessor system l~ith related circuitry to effect the above arran~ren~ents and sllch a system will be deseril)ed later with reference to Figure 5.
~ ;igure 4 sllows .lnalogue arrangements for the joystic~, update intervals an(l transi-tion time controls.
Joystic~; eontrol 37 eom~)rises two variable resistors one for verticnl and horizorltal position respectively.
Update interval control 34 eomprises one variable resistor whic~l controls a simple timing circuit ~not sllown) tnat operates on l,he freeze lines. The transition ti~e or velocity control 42 also coluprises a variable resistor and -this operates a si~ple ramp cireuit (not shown) tllat constrains t~e r~te at which the voltage that controls the position is allowecl to cl-ange fro~ one location to another.
The controls receive a vol~age fro[~ a precision ancllogue :112'~31i~
supply 52 W}liCh may be in the control unit or t21I;cn from the synchroni ser.
Tlle use o~ a microprocessor systell to effect the above control functions is sI)own in I~'igure 5. 'I`he l.e~tI t of the system is a i~icroprocessor unit (~I~)U) 60 (e.g. ~lotorola 6800). A r~ndom access memory (I~l) 62 (e.g. ~lotorola 6810) is connected to the ~PU wiIich acts as workin~ spaee for tlle ~)rogralnilie, ~.hieh processor programme is eontained in read only memory (I'O~I) 63 (e.g. ~'otorola 6~30). The memories are connecte-t to the ~IPU by eommon address bus 64 an~ colInlon data bus 55. The various s~-itches 31, 32~ 45, ~3, 36, 35, 38 (and -their assoeiate~ lamps) are eonneeted to I/0 cireuits 68,69 (peripheral in-terface adaptors e.g.
type 6820). lhese interface ~da~tors are eonnected to the ~II'U via eom~ion buses 64,65. An additional adar,tor 72 is provided to~ether with line drivers 7~ a~Jd line reeeivers 74 to provide the neeessary digital interfaeing to and from the synchroniser.
The analog controls of Fi6ure 4 are now ineluded in ~igure 5 arlcI are connected to the mieroproeessor system ~ia a multiple~cer 75 and an analogue to digital eonverter (ALC) 76 which converts the analogue signal to digital form to allow purely digital interfacing to and from the synchroniser of all required functions.
The programming of mieroprossors is well known and so will not be ~lescrilied in detail.
The microprocessor programme is written in such a way that the pushing of the relevent seleetor button and moving the joysticlc effects meuiorising of that location for the ILZ'~39~
compressed or -fllll fr mle picture -to allow -tlie pictllre to moi~e from one position to another It a rnt~ chosen by the v.lriable cransition control.
Ano-i,her a(lv~lnta~e of the microprocessor system is that the progrlm:ne cln be ~rit-tcn in such 1 manner that non-linear movelllellt of the picture from one stored locatio -to another is possible. In tt~is way picture movement similar t~ tl~at achieved ~y ttle camera man when having to accelerate arld (lecelera-te the mass of his camera can be obtained thelcby creating ~reater realism.
The varia~le transition contro~l is achieved by causing the l~rogramme to incren~entally count from one location to anotller. ~learly if this coun-t is fed as the address of the picture to the syncllroniser, smooth movement bet~een, instead of an inst3ntclnious juml) from one location to ~nother, is obtainell. The concept of non-linear movement can be realised by producillg a non-linear transfer function in -She programme space so that linear vectors denanded by -the main pragramme are 'bent' to move slower at the start and finish of thc process.
ACKGROUN~ TO THr I~ENTION_ The invention relates to synchronisers and more specifically to a video control arrangement for synchronisers.
Framestore synchronisers (e.g. Quantel DFS 3000) are now ~ell known in various parts of the television world for example North America and Europe (see also for example B,itish Patent No. 157il~ or U.S. Patent No. 4101939).
In the DFS 3000, the synchroniser has the facility of picture freeze within the frame store (see also for example British Patent No. 1568379 or U.S. Patent No.
4183058~. The facility of frame compression to produce quarter size pictures is provided (see also for example British Patent No. 1576117 or U.S. Patent No. 4152719).
Movement of the compressed picture may be effected by means of a joystick control.
OBJECT OF THE INVENTION
_ _ _ An object of the invention is to provide additional control facilities for the synchroniser which may be provided at a position remote from the synchroniser.
SUMMARY OF THE INVENTION
According to the invention there is provided a video -control arrangement for a synchroniser comprising positioning means for moving the posi~ion of a T.V. picture in at least one plane to a first selected position, memory means for receiving and holding information on the location of said first preselected position and for recalling the location oE th;s preselected position.
~6 ~ . .~ ~
112;~31~
~RI~ VES(;I~ll'i`I(~ Cl~ Di7~WI~l~S
rlhe invc~tion will now be descril~ed by wav of ex~mple with referel~ce to the ~ccompanyincr drnwings in whic~
Ii~ure 1 shos~s the ~nown synchroniser to which the control arr~ngement of the invention c~n be ~ttached;
ligure 2 shows typic~l ~anual controls of the unit;
I`i~ure 3 shows one arr-?ngetnent for presetting an~
rec.11lillg the im~C~e Jvsition in the control arrangement of t~Ie invention;
~ i~ure 1~ shows the joystick, updnte interval alld transitiorJ time controls; and Figure 5 sho~s an arrangement including a micro-processor f)r r~alising tlle functions of the Figure 2 arrangement .
~LSCIIIYTI~N OF I'l~ f301~ T~
.
The arrangement for t~e known DFS 300~) synchroniser is shown in ~igure 1. A video input is received by processin~ amplifier 10 w}lich feeds sync separator 11 controlling ~ write clock generator 12 ~hé clock ge~lerator output is received by an analogue to di~ital converter (ADC) 13 w~licll converts t~le video signal to digital form prior to storage in a fran~e store 14. The write clock generator 12 also has an output received by a store control 15 which controls the oper~tion sequence of the store 1~. The store output is received by di~ital to an~logue converter 16 w~lich is under the control of clocks from read cloc~ generator 17 receiving sync pulses from sync pulse ~ener~tor 1~. The analogue output of converter 16 is received by output processor 19 whicll provides tl~e composite video output of ~ 3~
the synchroniser. The sync pulse generator 18 is controlled by means of externally generated sub carrier and sync inputs directly or via an output sync separator 20 which receives a composite video signal.
The store control of the synchroniser has the facility of freezing the picture within the frame store (see also for example British Patent No. l568379 or U.S. Patent No.
4183058). The synchroniser has the facility of frame compression by only storing selected picture point samples so that if every other picture point is not stored (in both horizontal and vertical directions) a quarter sized picture is produced (see also for example Briti~h Patent No. 1576117 or U.S. Patent No. 4152719). The frame compressor 23 allows this compressed picture to be stored in any one of four quadrants by means of selectors 24- 27 which control the picture point counter addresses. In addition a joystick control ~8 is provided which allows the ~uarter size picture to be moved anywhere within the normal picture frame area by defining the pertinent varying address as the stic~ is moved.
The remote control arrangement 30 of the invention is connectable to the store control of the known synchroniser to provide the standard functions just described together with additional functions at a position remote from the synchroniser (e.g. in the studio mixer) by a distance of up to several hundred feet if required.
A typical layout for the manual controls of unit 30 is shown in Figure 2.
~aZ23~
A fr.3me freeze button 3l is provideti for 1'reezin~ captions.
~ l'ield freeze button 32 is ~rovidell for stop})in~ fast movinO o~jects on tt1e picture. In adc1ition an update control 31~ is provided whic1~ allows a varia~le update interval to be selected by t~1e proclucer to autome-tica]ly ul)da-te tbe frozen picture between a rate of say once per second -to infinity (i.e. hold).
~ 'ive preselect buttons 33 are providec1 for tl1e compressed picture position. '~'hese 'b11ttons no-t only select the compressed functi(-n when depressed but also have tl-e c~pability to memorize positions previously chosell at tl1e beginnin~ of the T.V. prpgramme so that these c~n be rec.~lled by the producer w11en required and thus nllow rehearsal of a programme prior to -transmission in the confidence t}1at when i.e ~30ves fro;n event to event on air the chosen se~uence will be faithfully reproduced. The chosen position is rec~lled merely by pressin~ the appropriate button and the cancellation of this effect to normal size and position is effected by depressin~-the appropriate button once again.
The memory facility is actuated during rehearsal in conjunction with 'live' button 36 and joystick positioner 37. The picture position is determined by v~lrying the joystick 37 with live button 36 depressed. If one of the preselect buttons 33 is also depressed the position of the joystick is reme;nbered for recall later.
It is also possible to move and memorise a full frarne of vicleo by melns of joystick 37 'by depressin~ live button 38 and one of t11e fixe preset bu-ttons 35 in a similar way to compressed frame. ~y only depressin~ the live button 36 or 38 it is possi'ble to rely only on live position 3:1~
control wit!out using ~ e presclect facilities of buttons 33 nd 35. Two buttons 40 and ~ re provicled to s~ tch off respectively the X and Y axes of the joystick to allow a smootll live single climenti-)nal pan or tilt.
A tr`nsition time control 42 is provided to allow the producer to selec-t the rate of pan or tilt from one ~-reselected position to anotler. The rate carl be varied typically from instantalleous to a time of several seconds.
Alternatively the rate of velocity tnay be varied.
An auto key button 45 is also provided. Thc auto key facility is prcvided to mclke life easier ior the ca~eraman.
The control is able to me sure the centrc of the cnroma key area tillen the chrom- key signal is fed into the s~nchroniser anll computes the ap~ropri.-te position -for the compressed iinage to be centrcd over the key signnl so t~lat if the calllera pans the compressed image automatically follows. Thus auto key is used ~here a chroma key signal is being fed to the synchroniser and the producer has ~pproximately centred a compressed picture o~er the key area using one ol the five preselector buttons. Pressing the auto key button 45 ~iill ensure that the compressed im~ge is automatically centred over the key area even if this key area should move. The various buttons described above may incorporate a lamp to cle~rly indicate tnclt a button is deT)ressed.
~ circuit arrlngement suitable for the compressed picture position presetting of ~i~ure 2 is shown in ~`igllre 3.
The position data from joystick control 37 can be passed via live switch 36 directly to the synchroniser so that ~lZ'~3~6 the joysticl; oper.1~,es itl ttle kno~Yn live mode. If llo~iever the preset switch 33 is closed, the position clata is fed into ~ ~lemory 50 ~ ere it is stored. \;~len -tbe position data is recallell this is passed to tile synchroniser to cause ~ovement to this position to ~e ilnplemented. Enter an(l recall l'or tlle meli]ory can l)e arrallOed to be actu<lted respectively ~ith the preset switch 33. The memory m~y be analoglle or digit~l depending on the type of ou-tput provirlell by tlle joystick and the synchroniser input. To provide the re~luirer~ents O.r tlle ~'igure 2 arrange~ent five SllCh switches 33 and memories 50 ~ould be required for the compressed pieture position and five similar arran~elDents f(~r the full frame position.
Although such a syst-e;n c~n be constr~lcted solely from lcnown har~ware elements it is more eonvenient to use a microprocessor system l~ith related circuitry to effect the above arran~ren~ents and sllch a system will be deseril)ed later with reference to Figure 5.
~ ;igure 4 sllows .lnalogue arrangements for the joystic~, update intervals an(l transi-tion time controls.
Joystic~; eontrol 37 eom~)rises two variable resistors one for verticnl and horizorltal position respectively.
Update interval control 34 eomprises one variable resistor whic~l controls a simple timing circuit ~not sllown) tnat operates on l,he freeze lines. The transition ti~e or velocity control 42 also coluprises a variable resistor and -this operates a si~ple ramp cireuit (not shown) tllat constrains t~e r~te at which the voltage that controls the position is allowecl to cl-ange fro~ one location to another.
The controls receive a vol~age fro[~ a precision ancllogue :112'~31i~
supply 52 W}liCh may be in the control unit or t21I;cn from the synchroni ser.
Tlle use o~ a microprocessor systell to effect the above control functions is sI)own in I~'igure 5. 'I`he l.e~tI t of the system is a i~icroprocessor unit (~I~)U) 60 (e.g. ~lotorola 6800). A r~ndom access memory (I~l) 62 (e.g. ~lotorola 6810) is connected to the ~PU wiIich acts as workin~ spaee for tlle ~)rogralnilie, ~.hieh processor programme is eontained in read only memory (I'O~I) 63 (e.g. ~'otorola 6~30). The memories are connecte-t to the ~IPU by eommon address bus 64 an~ colInlon data bus 55. The various s~-itches 31, 32~ 45, ~3, 36, 35, 38 (and -their assoeiate~ lamps) are eonneeted to I/0 cireuits 68,69 (peripheral in-terface adaptors e.g.
type 6820). lhese interface ~da~tors are eonnected to the ~II'U via eom~ion buses 64,65. An additional adar,tor 72 is provided to~ether with line drivers 7~ a~Jd line reeeivers 74 to provide the neeessary digital interfaeing to and from the synchroniser.
The analog controls of Fi6ure 4 are now ineluded in ~igure 5 arlcI are connected to the mieroproeessor system ~ia a multiple~cer 75 and an analogue to digital eonverter (ALC) 76 which converts the analogue signal to digital form to allow purely digital interfacing to and from the synchroniser of all required functions.
The programming of mieroprossors is well known and so will not be ~lescrilied in detail.
The microprocessor programme is written in such a way that the pushing of the relevent seleetor button and moving the joysticlc effects meuiorising of that location for the ILZ'~39~
compressed or -fllll fr mle picture -to allow -tlie pictllre to moi~e from one position to another It a rnt~ chosen by the v.lriable cransition control.
Ano-i,her a(lv~lnta~e of the microprocessor system is that the progrlm:ne cln be ~rit-tcn in such 1 manner that non-linear movelllellt of the picture from one stored locatio -to another is possible. In tt~is way picture movement similar t~ tl~at achieved ~y ttle camera man when having to accelerate arld (lecelera-te the mass of his camera can be obtained thelcby creating ~reater realism.
The varia~le transition contro~l is achieved by causing the l~rogramme to incren~entally count from one location to anotller. ~learly if this coun-t is fed as the address of the picture to the syncllroniser, smooth movement bet~een, instead of an inst3ntclnious juml) from one location to ~nother, is obtainell. The concept of non-linear movement can be realised by producillg a non-linear transfer function in -She programme space so that linear vectors denanded by -the main pragramme are 'bent' to move slower at the start and finish of thc process.
Claims (10)
1. A video control arrangement for a synchroniser comprising:
positioning means for moving the position of a T.V.
picture in at least one plane to a first selected position;
memory means for receiving and holding information on the location of said first preselected position and for recalling the location of this preselected position,
positioning means for moving the position of a T.V.
picture in at least one plane to a first selected position;
memory means for receiving and holding information on the location of said first preselected position and for recalling the location of this preselected position,
2. A control arrangement according to claim 1, wherein plurality of memory means are provided to receive and hold information on a plurality of preselected positions.
3. A control arrangement according to Claim 2 wherein transition means are provided to effect movement of said picture from one preselected position to another in a predetermined period.
4. A control arrangement according to Claim 3 wherein said transition means are variable to provide movement over a predetermined period range.
5. A control arrangement according to claim 1 wherein said memory means is for holding information on a full size picture.
6. A control arrangement according to claim 1 wherein said memory means is for holding information on a compressed picture.
7. A control arrangement according to claim 1 wherein freeze control means are provided to freeze the picture for a predetermined period and wherein update means are provided to update the frozen picture after a predetermined period.
8. A control arrangement according to claim 7 wherein the update means is variable to provide a variable update period.
9. A control arrangement according to claim 1 wherein auto key means are provided to ensure automatic centering of the position of the T.V,image.
10. A control arrangement according to claim 1 wherein the control arrangement can be provided remote from the synchroniser via coupling means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3947/77A GB1576461A (en) | 1977-02-01 | 1977-02-01 | Control arrangement for video synchronisers |
| GB3947/77 | 1977-02-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1122316A true CA1122316A (en) | 1982-04-20 |
Family
ID=9767887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA295,969A Expired CA1122316A (en) | 1977-02-01 | 1978-01-31 | Micro processor control for video synchroniser |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4172264A (en) |
| CA (1) | CA1122316A (en) |
| DE (1) | DE2804294A1 (en) |
| FR (1) | FR2379213A1 (en) |
| GB (1) | GB1576461A (en) |
Families Citing this family (52)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4266242A (en) * | 1978-03-21 | 1981-05-05 | Vital Industries, Inc. | Television special effects arrangement |
| US4272787A (en) * | 1978-09-07 | 1981-06-09 | Micro Consultants Limited | T.V. Picture freeze system |
| JPS5558868A (en) * | 1978-10-21 | 1980-05-01 | Takeshi Harada | Video reproducing unit |
| GB2063616B (en) * | 1979-11-16 | 1984-06-20 | Quantel Ltd | Multiple picture image manipulation |
| JPS56157179A (en) * | 1980-04-11 | 1981-12-04 | Grass Valley Group | Special effect device |
| US4631750A (en) * | 1980-04-11 | 1986-12-23 | Ampex Corporation | Method and system for spacially transforming images |
| JPS5779944A (en) * | 1980-11-06 | 1982-05-19 | Nireko:Kk | Detector for equal color tone region |
| US5289566A (en) * | 1980-12-04 | 1994-02-22 | Quantel, Ltd. | Video image creation |
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-
1977
- 1977-02-01 GB GB3947/77A patent/GB1576461A/en not_active Expired
-
1978
- 1978-01-27 US US05/873,037 patent/US4172264A/en not_active Expired - Lifetime
- 1978-01-31 CA CA295,969A patent/CA1122316A/en not_active Expired
- 1978-01-31 FR FR7802619A patent/FR2379213A1/en active Granted
- 1978-02-01 DE DE19782804294 patent/DE2804294A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2379213B3 (en) | 1980-09-19 |
| GB1576461A (en) | 1980-10-08 |
| DE2804294C2 (en) | 1992-10-29 |
| US4172264A (en) | 1979-10-23 |
| DE2804294A1 (en) | 1978-08-03 |
| FR2379213A1 (en) | 1978-08-25 |
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