PATENT SPECIFICATION
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`1370535
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`(21) Application Nos. 6136172
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`(22) Filed 9 Feb. 19132
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`33fi5l,r'72
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`18 July 1972
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`(23) Complete Specification filed 9 May I9’r'3
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`(44) Complete Specification published 16 Oct. 1974
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`(51) International Classification H04N 7/08
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`(52) Index at acceptance
`H4? D213 DBOK
`H4-L 26E3X 26E5B 26G2A
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`(11)
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`
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`(72) Inventors IAN DAVID BALFOUR MILLAR.
`FREDERICK GORDON PARKER and PETER RAINGER
`
`(54) TRANSMISSION OF ALPHANUMBRIC DATA BY TELEVISION
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`We, Bnrrrsrr Baoancasrrnc Coar-
`(71)
`orutrron, a British body corporate of Broad-
`casting House, London, WIA 1AA, do
`hereby declare the invention, for which we
`pray that a parent may be granted to us,
`and the method by which it is to be per-
`formed. to be particularly described in and
`by the following sta1emc.nt:—
`This invention relates to television systems
`and receivers and concerns systems which
`enable alphanumeric information, such as
`captions and pages of information to be
`transmitted simultaneously with a video
`signal While allowing the picture represented
`by the video] signal to be displayed with or
`without the alphanumeric information.
`It is well known to superimpose captions
`such as sub-titles on a picture by including
`the information relating thereto in the video
`signal itself. The caption is then unavoid-
`ably displayed with the picture. There are
`however situations in which it is desirable to
`have caption information available for dis-
`play only if so desired.
`For example,
`this possibility would en-
`able deaf viewers (of which there are many)
`to have added to their pictures sub-titles
`which would not appear on the screens of
`non-deaf vicwcrs. Furthermore information
`totally unrelated to the pitcures could be
`trunsruitted with the video signal for recep-
`tion only by selected viewers who could
`display such information with or without the
`picture or store the information for later
`d1splay_ Such information could be stock
`exchange reports for example. Another pos-
`sibility 15 to superiinpcse information relating
`to the source. the routing and destination of
`a video signal for display only on monitor
`screens viewed by producers, programme
`controllers and sucI1 personnel, or for effect-
`ing automatic executive action relating to the
`signal routing and monitoring. This would
`tly f work of such persons in
`
`controlling the switching of cameras, etc.,
`especially in complex outside broadcast situ-
`auons.
`
`Various proposals have been made for
`adding information to a television signal. In
`some, extra video waveforms are placed on
`lines in the television vertical
`interval.
`It
`has also been proposed to use these lines to
`carry digital codes. The object of the pre-
`sent
`invention is to provide an improved
`system which combines the advantages of
`us'
`digital codes with the ability to effect
`disp ay operating with a conventional tele-
`vision raster. The use of digital codes leads
`to great flexibility; all of the POSSi.l_‘.Il.l.lll.BS en-
`visaged above are readily catered for and
`the
`embodiments
`described
`below will
`demonstrate how the system can handle
`either the simple addition of single line sub-
`titles to pictures or the ‘transmission of indi-
`vidually selectable complete pages of infor-
`matron.
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`According to the present invention in one
`aspect, there is provided a television system
`comprising a source of a video signal, means
`operative synchronously with the video sig-
`nal to supcrimposc or otherwise add thereto,
`without
`interfering with the picture signal
`included therein,
`3. digitally coded data
`signal
`representing alphanumeric informa-
`tion, and a receiver adapted to receive the
`video signal and display a corresponding
`picture, the receiver including a first circuit
`adapted to extract the digitally coded data
`signal
`from the received
`video signal,
`means
`for
`storing the
`digitally
`coded
`signal, and a decoding circuit operative syn-
`chronously with the line time base of the
`receiver to convert the stored digitally coded
`data signal
`into a corresponding repetitive
`vision signal representing the alphanumeric
`information.
`According to the invention in another
`aspect, there is provided a television receiver
`
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`for use in a television system wherein a
`digitally coded data signal
`representing
`alphanumeric information is superimposed
`on or otherwise added to a video signal in
`synchronous relation thereto, vvithout inter-
`fering with the picture signal included these-
`iu, the receiver being adapted to receive the
`video signal and display a corresponding
`picture, and including a first circuit adapted
`to extract
`the digitally coded signal from
`the received video signal. means for storing
`the digitally coded signal. and a decoding
`circuit operative synchronously with the line
`time base of the receiver to convert
`the
`stored digitally coded data signal
`into a
`corresponding repetitive vision signal repre-
`senting the alphanumeric information.
`It will be understood that the receiver may
`be a broadcast receiver, a closed circuit re-
`ceiver, or other form of visual readout means
`separate from the television display. The
`receiver need not have its scanning time
`bases locked to the incoming signal;
`they
`may be controlled by a local source. The
`decoding circuit
`is in any event synchro-
`nised with the line time base at the receiver.
`The alphanumeric vision signal and the
`main vision signal carried by the video signal
`may be combined in various known ways to
`produce different
`types of display of
`the
`alphanumeric information, e.g. simple super»
`impositions, white symbols in a black strip
`or box, black symbols in a white strip or
`box, black edged white symbols or .wl1ite
`edged black symbols. Markers may be in-
`eluded-in the transmitted signal to create a
`strip or box in the receiver. For simplicity.
`however, the vision signal preferably switches
`between black level. representing the ground
`for the symbols, and a whiter than white
`level representing the syIub.ols- themselves.
`The signal can then simplybe added to the
`main vision signal
`to produce very bmht
`symbols which will contrast adequately with
`the picture. A coded control signal can be
`made to switch a colour synthesise: at the
`receiver for controlling the hue of the dis-
`played symbols.
`The storing means for the transmitted
`alphanumeric information may be provided
`at the receiving terminal on a large scale.
`for example 25,000 ‘characters equivalent to
`say 32 printed pages, by magnetic or other
`means, to provide data on a wide range of
`subjects each of which can be independently
`selected by individual viewers provided with
`suitable equipment additional to .or built into
`the domestic television receiver. By this
`means the general utility of the television
`service may be expanded and specialised
`interests catered for.
`The digitally coded data signal which pro-
`vides for updating the multiple page store
`may be organised in various different ways,
`of which examples are given below.
`
`If the information transmission rate“ is
`made sufficiently high, access to several
`pages of information may be provided very
`economically using only a store for the one
`page under scrutiny at the receiver, a small
`delay before reading a newly selected page
`while this is being read into the store then
`being accepted; the higher the information
`rate the smaller the delay will be.
`-
`The alphanumeric vision signal as derived
`from the" digital code may be displayed
`alone, a switch on the receiver being pro-
`vided for cutting out the main vision signal
`carried by the vi_deo.sigriaI Alternatively,
`the two vision signals may be combined in
`various known ways to produce different
`types of display of the alphanumeric infor-
`mation. e.g. simple superitnpositions, white
`symbols in a black strip or box, black sym-
`bols in a white strip or box, black edged
`white symbols or white edged black symbols.
`Markers may be included in the transmitted
`signal to assist the creation of this box or
`strip within the receiver. A coded control
`signal can be made to switch a colour
`synthesiser at
`the receiver for varying the
`hue of the displayed symbols.
`The video signal, including the data sig-
`nal, can be recored to enable later use of
`the si
`al or at least the data signal portion.
`The
`ata signal alone can be recorded by a
`low bandwidth device, such as a magnetic
`tape recorder, for later utilisation. Thus,
`‘ti_t;e_ recorded data signal can be fed, when
`required, into the storing means of the re-
`ceiver. The receiver can alternatively include
`storage for storing the vision signal, in the
`form of bits representing dot matrix charac-
`ters, enabling the data to be utilised at a later
`time.
`The coded data signal may be added to
`the transmitted signal in various ways without
`interfering with the picture signal
`included
`therein. For example, the data signal may
`be modulated upon the sub-carrier in the
`sound channel or upon a se aratc sub-carrier
`in the neighbourhood of
`e sound carrier
`frequency. Thus,
`if sound is carried (in
`U.K. standards) on a 6 MHZ sub-carrier, the
`data signal can he carried on a 6.3 MHz sub-
`If the data rate is kept low.
`the
`required bandwidth is small enough for there
`to -be no problem with interference. The
`data signal may be superimposed on the
`horizontal
`intervals of a plurality of lines
`of the video signal.
`.
`Alternatively, and _pre_fe.rabl-y;"the' coded
`data signal can be added as pulses to one
`or more lines of the video signal which carry
`no ordinary picture information,
`i.e.,
`the
`lines provided during the vertical
`interval
`to allow the field time base to stabilize before
`the first picture line of the new field. For
`some applications this information could be
`carried by a number of lines, if necessary,
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`occupying the entire picture period. Further-
`more, this signal could be recorded at video
`for later utilization.
`An embodiment of the invention utilizing
`this mode of transmitting the data signal
`will now be described, by way of example,
`with reference to the accompanying draw-
`ings, in whic.h:—
`Figure 1 is a block diagram of the trans-
`mitting terminal,
`Figures 2 and 3 show block diagrams of
`corresponding receiving terminals,
`Figure 4 is a block diagram of a second
`transmitting terminal, and,
`Figure 5 is a block diagram of a receiving
`terminal for use therewith.
`The illustrated embodiment is intended to
`provide 32 pages of data with 168 charac-
`ters per page, arranged in 24 32-character
`rows, pages being selectable at will by the
`viewer whose
`receiver
`is
`appropriately
`equipped. The data can be fed into the
`system from a number of asynchronous
`sources 51 (Fig. 1) which may be geographic-
`ally separate. The data is then ordered and
`stored, by computer techniques which are
`well known, under the control of an execu-
`tive program in a data ordering and storage
`unit 52.
`Unit 52 receives timing signals which per-
`mil; it to put out synchronous data to be
`added to the video signal during the tele-
`vision vertical interval (field blanking inter-
`val) as NRZ pulses on two oi the unused
`lines which precede the picture information,
`in a manner similar to that described below
`with reference to Fig. 4. The said two lines
`can be lines 13 and 14 of even fields and
`lines 326 and 327 of odd fields in a 625 line
`system.
`Assuming that the alphanumeric charac-
`ters are represented by an 8-bit data code.
`there may be capacity for 32 characters in
`the said two lines of a single field. Various
`data organisations may be considered by way
`of example,
`the bits of a character being
`sequential in both cases. The first organis-
`ation will be called page-interlaced, each
`page having 768 characters in 24 rows of
`'32 characters, and has the first character of '
`pages 1 to 32 in the lirst field, the second
`character of pages l to 32 in the second field,
`and so on. Each page thus has an invariant
`position in the time cycle of a field and a
`complete data cycle requires 768 fields, i.e.
`15.4 sec. at 50 fields per second. Field 1
`of the cycle (or the preceding field 0) has a
`special framing character inserted therein,
`whose purpose is explained below.
`The second organisation is page-sequerr
`rial; the 768 characters of the first page are
`transmitted in the first 24 fields. a sin pre-
`ceded by a framing character. the
`at-acters
`of the next page are transmitted in the next
`24 fields. and so on.
`
`A third and preferred organisation is simi-
`lar to the first but the page-interlacing is by
`row rather than by character. Fields 1 to
`32 contain row 1 of pages to 32 respectively,
`fields 33 to 64 contain row 2 of pages 1 lo 32
`respectively, and so on.
`Given any such fixed data organisation,
`the data can be de—muItip1exed purely by
`rirning operations synchronized relative to
`the framing character. However. it may be
`preferred to add to the character codes ad-
`dress codes which identify, to take the ex-
`ample of the third organisation,
`the
`age
`and row being transmitted in any given geld.
`If such address codes are employed de-
`multiplexing‘ no longer relies upon timing
`operations and the framing character is not
`essential. Furthermore. flexibility of data
`organisation becomes permissible and the
`system can be adaptive, unused pages or
`unused lines in a page being omitted from
`the data fonnat, thereby shortening the time
`taken for a complete data. cycle. Thus, fields
`pertaining to absent digitally coded data sig-
`nals and! or to absent rows of characters can
`be omitted from the data cycle.
`in
`Fri. 2 illustrates a receiving terminal
`whr_c
`the binary data is first separated by
`a crreurt 53 which times the data pulses out
`of the said two lines, for example in the
`manner described in relation to Fig. 5. These
`pulses are used to update a multiple page
`store 54. This store holds approximately
`200,000 bits on a magnetic disc, representing
`the total of the data available to the viewer
`at any time,
`the actual number of bits re-
`quired being 23X768 X 8. The page selector
`55 under manual control applies data from
`the required page to a read only memory
`dot matrix character generator 56.
`The
`character generator uses timing signals to
`address the R.O.M. and produces an output
`signal of alphanumeric information based on
`a 7X5 dot matrix in vision signal form to
`provide the input
`to the display, again as
`described in more detail below.
`(although
`other matrix formats could be used).
`The disc store 54 can have 32 concentric
`tracks. one per page and a single read-write
`transducers. Only the page being displayed
`can therefore be updated.
`if the first page-
`interlaced organisation is employed, the page
`selector 55 performs two functions; it moves
`the-_ transducer to the selected track and shifts
`a tuning gate (8-bits wide) at the input to the
`store ruto corncidcnce with the time position
`in the frame which corresponds to that page.
`In order to enter the characters into the cor-
`rect positions on the track, the system waits
`until
`the framing character a pears. The
`next character passing through the timing
`gate is then written into the first character
`position of the selected track. and so on, one
`character per field. The rotation of the disc
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`is kept synchronous with the appearances of
`the framing character.
`It the page-sequential organisation is em-
`ployed the disc is again synchronized to the
`framing character, so that each revolution
`corresponds exactly to a goup of 24 fields
`representing one page. The page selector
`again selects the correct track by positioning
`the transducer in alignment therewith and
`sets a field counter to 24(N—1) where N is
`the selected page number. When the fram-
`ing character appears, the counter is counted
`down by 1 for each field and, when it reaches
`0,
`the characters appearing in the next 24
`from are written into the store.
`If the third organisation is employed the
`page selector moves the transducer to the
`selected track and sets
`a mod-32 field
`counter to one less than the page number
`N. The counter is counted down cyclically
`by 1 for each field and, each time it reaches
`0, the row of 32 characters in the corres-
`ponding field is written into the store.
`Fig. 3 illustrates an embodiment of the
`receiving terminal in which page selection is
`- accomplished before storage; in this embodi-
`ment at single page store 59 of 6,144 hits
`only is required and this is- most CCOfl0D2llC~
`ally achived in integrated circuit technology.- -
`The page selector 58 simply selects the
`_ timing gate
`position for
`reading into the
`store if the page-interlaced organisation ls
`used or sets the field counter as just des-
`crigpd if either of the other organisations is
`us
`'
`Details of the timing and logic circuits
`have not been given since they employ con-
`ventional
`techniqnes of data processing
`equipment, eg as in the second embodi-
`ment. Obviously there are almost limitless
`possibilities for detailed design. Other data
`organisations may be used and. in order to
`keep the number of bits added to any one
`line to an acceptable value it may be desir-
`able in the embodiments described to expand
`the time scale by a factor of two and use
`four lines for 32 characters and carry only
`16 characters per field.
`Instead of using
`serial stores as described, addressed random
`access stores may be employed,
`in which.
`case each character or row of characters has
`-added thereto‘ address code bits defining the
`page andfor the position within the page
`thereof. depending on the data organisation
`employed.
`.
`In this case the page selector sets up
`the required page code and the timing sig-
`nals set up a sequence of character or row
`address codes. The incoming address codes
`are compared with the set-up codes and, as
`matches occur,
`the
`associated character
`codes are entered into storage.
`-
`In the preferred arrangement. utilizing the
`aforesaid third organisation,
`the said two
`lines in the vertical
`intervals are used as
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`follows. The first part of the first line in-
`cludes a fairly long address code specifying
`the page and row being transmitted plus
`several bits which serve to establish the tim-
`ing of the data extraction in the receiver, to
`provide for parity checks and possibly to
`provide other
`redundant, error checking
`facilities. The remainder of the first line and -
`the whole of the second line are used for the
`32 8-bit codes representing the characters of
`a row.
`The embodiment illustrated in Figs. 4 and
`5 utilises the aforesaid first organisation and
`is intended to display a line of 32 characters,
`e.g. for sub-titling pictures only for deaf
`viewers whose recelvets are 2;ppropriately
`equipped. The data can be ed into the
`system using a paper tap reader (as in the
`illustrated embodiment), magnetic tape, or a
`manual keyboard with buffer store and edit-
`ing facilities. Each line of characters is
`punched in a. standard ISO-7 code on 8-hole
`paper tape, preceded by STX (start of text)
`and followed by ETX (end of text). The
`eighth. parity bit is ignored in this descrip-
`tion and in fact it is assumed that only 6
`bits are crupiuyed,
`this being all
`that
`is
`necessary for upper case symbols only. How-
`ever, ? bit working can clearly be employed
`to give full upper and lower case capability.
`The tape is read by a tape reader 10 (Fig.
`4), one character per field, during the 13th
`line of each even field.
`(the 326th line of
`each odd field) this line preceding the vision-
`To this I00
`carrying lines of the video signal.
`end a line sync pulse counter-decoder 11
`counts sync pulses provided on an input 12
`_and produces on an output pulse marking
`the -13th line. being of approximate]
`line
`The counter-deco
`r 11 105
`period duration.
`opens an AND gate 13 during the 13th
`line and allows the sync pulse also applied
`to the AND gate 13 but delayed very slightly
`by a delay circuit 14, to pass to an AND
`gate 15. This gate is opened when it
`is
`desired to change the line of characters by
`setting a bistable flip-flop 16. This is effec-
`ted by a pulse _on_an input 1'? which may be
`provjdedvh-om a push button or by a cue-
`big signal from a video recorder, for ex- 115 -
`arnple. The Eli
`-flop is reset when a detector
`18 detects the TX character.
`In this way, each time the flip-flop 16 is
`set. the next block of up to 32 characters,
`preceded by STX and followed by ETX. is 120-
`ulsed out of the tape reader in hit-parallel
`ormat, one character per field.
`The characters enter a register 19 which
`is a 6-bit shift register with parallel entry.
`The characters are immediately shifted out 125
`of register in bit-serial format, and through
`an A1\lD gate 20 opened by the counter-
`decoder 11, to an output line 21. The pulses
`are fed to the video circuits of the trans-
`mitter (not shown) to be superimposed on 130
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`the vision signal portion of the 13th line. To
`ensure that the six bits appear at accurately
`defined portions in the line, a bit clock
`source 22 running at a higher frequency than
`line frequency feeds a hit counter 23. Selec-
`ted states of the counter are decoded by El
`decoder 24 so as to generate, in each line,
`six accurately positioned bit marker pulses.
`These are used as the shift pulses which
`shift the bits serially out of the register 19.
`To ensure accurate maintenance of the
`bit marker pulse positions.
`the counter 23
`is reset at the beginning of each line by the
`sync pulse passed by the gate 13.
`At the receiving end (Fig. 5), the charac-
`ters are extracted from the viedo signal on
`a line 30 by applying six bit marker ulses to
`a six bit shift register 31 with paralle output.
`These marker pulses are generated by a bit
`clock 32, counter 33 and decoder 34, cor-
`responding to items 22, 23 and 24 in Figure
`4. To ensure that
`the marker
`ulses are
`only presented to the register 31
`urmg line
`13 a line counter 35 and line decoder 36
`open an AND gate 37 during the 13th line
`only.
`The characters have to be transferred, one
`per field,
`into the correct poistions in six
`32-bit shift registers 38 (of which only two
`are shown) which constitute recirculatin
`stores holding 32 characters in bit-paralle ,
`character serial format. The registers are
`recirculated synchronously with the line
`period, via normally 0 en AND gates 39.
`by pulses from a divi er 40 which divides
`down the bit clock to provide 32 pulses
`each line period.
`When characters are being received they
`are timed into the correct positions in the
`registers 38 during the 14th line by pulses
`provided by a comparator 41. These pusles
`pass through an AND gate‘ 4?. which is en-
`abled only during the 14th li_ne by the
`decoder 36 and only when a bistable flip-
`[lop 43 is set. The fiip~flop is set when a
`circuit 44 detects STX and reset when this
`circuit detects ETX. The detection of STX
`also causes a-fieId counter 45 to be reset.
`This counter now'cour1ts__1, 2, 3, etc.
`in
`successive fields and provides‘one input to
`the comparator 41. The other input is pro-
`vided by the bit counter 33 and the com-
`parator 4-1 produces an output pulse each
`time that the hit counter counts u
`to the
`number in the field counter 45.
`e com-
`parator output pulses therefore appear at
`progressively later positions in the line in
`successive fields, these positions being timed
`to coincide with the times at which the suc-
`cessivc characters respectively are re-entered
`in the registers 38.
`The pulses from the comparator 41 passed
`by the gate 42 enable AND gates 46 con-
`nected between the parallel outputs of the
`register 31 and the inputs to the registers 38.
`
`Simultaneously, the recirculation gates 39 are
`closed via an inverter 47. By this means, the
`32 characters in the registers 38 are replaced
`by the incoming characters at the rate of
`one per field
`Each character appearing at the output of
`the registers 33 is converted into a. video
`waveform ever say 8 adjacent line scans near
`the bottom of the picture, assuming that the
`displayed characters occupy a matrix of pic-
`ture elements 7 lines high and 5 elements
`wide in a character space of 8 lines high and
`6 elements wide. This conversion is per-
`formed by apparatus which is known in itself
`and is therefore only briefly described.
`The six bits from the register 38 are pre-
`sented to one set of inputs of a ROM (read
`only memory} 43 which has other inputs
`from the line counter 35. The ROM is essen-
`tially a complex decoder which converts each
`character into six bits in each of eight adja-
`cent
`The “I” bits represent the ele-
`menm of the 7X5 matrix which make the
`character in question. Each set of five bits
`is buflered in a 5-bit shift register 49 with
`parallel entry and serial readout. The bits
`are pulsed out by 9. clock 49A to provide a
`two-level video signal on line 50. This sig-
`nal is available to be recorded, to be dis-
`played by itself or to he added to the
`incoming video signal for display of
`the
`characters on the picture.
`lines are
`The aforesaid eight adjacent
`actually four from each of two interlaced
`fields. This complication is readily taken
`care of by programming the ROM 43 to
`decode o11 the correct line numbers. Charac-
`ter hcight can be conveniently increased in
`multiples of eight lines.
`With the arrangement described the dis-
`played characters can be seen to change one
`by one (during 32 consecutive fields) when
`a fresh line of characters is transmitted from
`the punched tape.
`If this is considered ob-
`jectionable it may be arranged to blank the
`signal on line 50 while the flip-flop 43 is
`set.
`
`The bit formats employed can be changed
`in various ways. For example, although the
`described format may be preserved in the
`registers 38,
`the arrangements of Figure 4
`and that part of Figure 5 preceding these
`registers may be altered in such a way that,
`in each of six consecutive fields, the 32 bits
`for one register 33 are transmitted in series.
`It will then be essential to blank the output
`on line 50 during such transmission.
`
`WHAT WE CLAIM IS :—-~
`1. A television system comprising a source
`of a video signal, means operative synchron-
`ously with the vidco signal to superimpose
`or otherwise add thereto, without interfering
`with the picture signal included therein. a
`digitally coded data signal
`representing
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`70
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`110
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`115
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`125
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`130
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`PMC Exhibit 2055
`
`Apple v. PMC
`|PR2016-00753
`
`Page 5
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`PMC Exhibit 2055
`Apple v. PMC
`IPR2016-00753
`Page 5
`
`

`
`1.370.535
`
`al hanumeric information, and a receiver
`a pterl to receive the video signal and
`pie
`:1 corresponding picture,
`the receiver
`inc uding a first circuit adapted to extract the
`digitally coded data signal from the received
`video signal, means for storing the digitally
`coded signal, and a decoding circuit 0 er-
`ative synchronously with the line tirne
`ase
`of the receiver to convert the stored digitally
`coded data signal into a corresponding re-
`petitive vision signal representing the alpha-
`numeric information.
`2. A system according to claim 1,
`wherein the receiver time bases are synchro-
`nised lo the video signal.
`3. A system _ according to claim 2.
`wherein the receiver time bases are synchro-
`nised to a local source.
`4. A system according to claims 1, 2 or
`3, wherein the digitally coded data signal is
`modulated on a suh~carrier.
`claim 4,
`5. A system according to
`wherein the sub-carrier is the sound chan-
`nel of the video signal.
`6. A system according to clalrns '1, 2 or
`3, wherein the digitally coded data signal is
`superimposed on the horizontal_i.ntervals of
`a plurality of lines of the video signal.
`7. A system according to claims 1, 2 or
`3. wherein the digitally coded data signal is
`superimposed on one or more lines in the
`vertical interval of the video signal.
`_
`3. A" system according to any precedmg
`claim, wherein a plurality of different d1g_1t-
`ally coded data signals are multiplexed With
`the video signal and the receiver includes
`means for selecting one of the digitally coded
`dataalsignals to be converted into the vision
`s1
`.
`gill. A system — according to
`claim 3.
`wherein the storing means has sections for all
`of the digitally coded data signals and the
`selecting means are operative to couple any
`selected section of the store to the decoding
`circuit.
`10. A system according to claim 8,
`wherein the storing means is capable of stor-
`ing only one digitally coded data signal and
`the selecting means are operative to select
`any one of
`the extracted digitally coded
`data signals for entry into the star‘
`_means.
`11. A system according to c
`10,
`wherein each digitally coded data signal
`occupies predetermined time locations within
`a recurrent data cycle and wherein the select-
`ing means are synchrotrized to the _data
`cycle to select a digitally coded data signal
`in accordance with the
`time
`locations
`assigned thereto.
`'
`13. A system accordin
`to claim 10,
`wherein each digitally cod
`data signal has
`address
`codes
`associated therewith and
`wherein the selecting means selects a digitally
`coded data signal by recognition of its ad-
`dress codes.
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`13. A system according to any of claims
`8 to 12, wherein the digitally coded dala
`signals follow sequentially within a repetitive
`data cycle comprising a plurality of fields.
`14. A system according to any of claims
`8 to 12. wherein the digitally coded data
`signals are interlaced with each other within
`a repetitive data cycle comprising a plurality
`of fields.
`15. A system according to claim 14,
`wherein each field contains one character
`from each digitally coded data signal.
`16. A system according to claim 14,
`wherein each digitally coded data signal
`consists of a plurality of rows of characters,
`each field contains one row of characters
`and the digitally coded data signals have
`their rows of characters interlaced.
`17. A system according to claim 16, in-
`sofar as dependent on claim 12, wherein
`each field contains, in addition to a “row of
`characters, an address code identifying the
`digttally coded data signal and the row there-
`of to which the charatcers pertain.
`18. - A system according to claim 17,
`wherein the said means operative synchron-
`ously" with the data signal are adapted to
`omit from the data cycle fields pertaining to
`absent digitally coded data signals andfor
`,1o absent rows of characters.
`19.. A system according to any of claims
`' 1 to 18; wherein the first circuit, the storing
`means and "the decoding circuit‘ form an
`attachment to the receiver.
`20. A system according to any of
`l to 18. wherein the first circuit, the storing
`means and the decoding circuit are built into
`the receiver.
`21: «A system according ct any of claims
`1 to 20, wherein the receiver includes means
`for combining the said, yigion signal with the
`picture signal -to“ display "the" ‘alphanumeric
`information superimposed on the picture.
`22. A systemaceording to any of claims
`1 to 20. wherein the receiver includes means
`for selectively preventing the receiver
`re-
`spending to the picture signal and__ causing"
`the receiver to respond tothe vision signal
`to display the _alphanui:neric information
`alo1_:te._‘...- -.--v
`23. A system according to any preceding
`claim, comprising further storing means for
`storing the digitally coded si
`and means
`for reading the contents of
`re further stor~
`mg means into the first-mentioned storing l2UL
`means.
`.
`v
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`100
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`105
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`110
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`115
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`24. A system according to any of claims
`1 to 22, comprising further‘ storing means rs:
`storing the vision signal
`in the form of a
`bicarysignal.
`25. A system accordingto any preceding
`claim, wherein the vision signal
`is a two-
`level signal switching between black level
`and a whiter than white level.
`26. A television receiver for use in a
`
`125
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`130
`
`PMC Exhibit 2055
`
`Apple v. PMC
`|PR2016-00753
`
`age 6
`
`PMC Exhibit 2055
`Apple v. PMC
`IPR2016-00753
`Page 6
`
`

`
`1,3? 0,535
`
`a
`
`television system wherein a digitally coded
`data signal representing alphanumeric infor-
`mation is
`su crirnposed on or otherwise
`added to 3. vi o signal in synchronous rela-
`tion thereto, without
`interfering with the
`icturc signal included therein, the receiver
`ing adapted to receive the video signal
`and
`display
`a
`corresponding
`picture,
`and
`including
`first
`circuit
`adapted
`to
`extract
`the
`digitally
`coded
`data
`signal
`from the
`received video signal,
`means for storing the digitally coded signal,
`and a decoding circuit operative synchron-
`ously with the line time base of the receiver
`to convert the stored