Method for teletext character alignment and device for carrying out this method

[Detailed Description of the Invention]

The present invention relates to the method of aligning, namely, carrying out position Matching of the videotex character (videotex characters) on the screen of a TV apparatus. The present invention relates also to the device for enforcing the method again. The videotex method is indicated by the France patent application No. 2363949 specification. In this method, the display of the character on the screen of a TV apparatus is controlled by the character generator to which data is supplied from a page memory. Although the character was made ANTIOPE regulation, it is arranged by the level line which has the number of scanning lines equal to intermediary 10, respectively. In the limitation about an alphabetical letter, it is desirable to arrange these characters about a line as low as possible. However, when a certain character, i.e., a certain small letter, has a lower-berth portion prolonged in a lower part from the common character part like "y", "p", "q", "j", and "g" and it aligns such a small letter with the character of other models, it is needed at least for side to make a common character portion the upper part about Bottom line of a line. If it takes into consideration that a display is not performed by the line of the beginning of each line from such a situation when one line is constituted from a scanning line of 10, they are the nine remaining lines, It will be divided into two lines for the upper row portion of the character which has a portion prolonged to five lines and a lower-berth portion to a character body part to the up side like two lines, "l" and "d", and "t." A possibility of saying that an ANTIOPE method can double the height of a character by repeating the display of a scanning line also by the line of the following Continuing is provided. Therefore, when the line which consists of the twice as many number of lines as this has an one-unit height (1H) character and a double height (2H) character, remarkable mismatching arises by the method described above. the place which saying will have, the lower berth, i.e., the downward portion, of height in which the small letter of 2H is equivalent to four lines, at least big side equivalent to two lines produces in 1H character, and 2 H characters, and a view festival person perceives easily -- it is hard to carry out intermediary acceptance. the data which the present invention read the data of the this line in scanning time of the 1st line (not displayed) of one line, and was read in order to conquer the above faults -- therefore, it proposes adjusting the alignment relation of a character. If it states more concretely, the following matter will be confirmed during the scanning time of the line of the beginning of each line. 1 Reach [ whether Line Consists Only of a 2H Character, and ], 2 It is judged whether the line has at least one small letter of 2H, and position Matching is performed as follows. namely When a line has only 2H character, at least side makes only two lines the upper part about position Matching of 1H character, and it performs position Matching. b line has 1H and 2H character both, and when it does not have a small letter of 2H, position Matching is made the same as the case of 1H character. When c line has 1H and 2H character and moreover has at least one small letter of 2H, only one line makes at least side the upper part about position Agreement of 1H character, and position Matching of 2H character is performed, and the line of the last of 2H small letter is not repeated. If judging standards 1 and 2 above defined during the 1st scan of a line are followed, alignment satisfied with all the loose case or position Matching will be attained. In c), the quantity of offset, i.e., the amount, is only one line, therefore at least side between alignment of 2H character and alignment of 1H character cannot be easily perceived by the observer. The present invention will become still clearer from explanation of the following which refers to an accompanying drawing. the -- the [a / 1 / figure thru/or ] --c [ 1 ] figure shows the portion of the screen of the TV apparatus used for the display of the written text, and the word "Lyon" has appeared on Then and this screen. In an ANTIOPE method, although one character row usually occupies ten scanning lines, it considers Things which has a height of 2 twice, i.e., 20 scanning lines, on these specifications, including [ therefore ] the character in which a line has a height (1H) of one unit, or its more than twice as many height (2H) as this. therefore, a scanning line -- the -- the [a / 1 / figure thru/or ] -- the reference number of each In 1 thru/or 2 ofc [ 1 ] figure is given. the -- position Matching shown ina [ 1 ] figure -- L -- although 2H character is included, it is the same as position Matching of the standard of the line containing only 1H character. Namely, body part a of character y₁Is, Bottom linee of a line₁Portion c to which it is alike, and it is related, and is arranged at least by side of the line of two duties, and this side extends in the lower part of 1H character₁It is alike and corresponds. such position Matching -- the --a [ 1 ] figure -- like -- one line -- 1H character (yon) and 2 -- it is adopted, when H characters (L) exist and the small letter which is 2H does not exist. Bottom line of 2 H character L is one line d'.₁Line d of Next₁It comes out and is obtained by repeating. When the line comprises a 2H character, Fairly adoption of the alignment method of the 1st the b figure is carried out. In this case, it is a line of two duties, i.e., d, from the case of the 1st the a figure.₁It is d more.₂At least Only deviation is carried out and position Matching is performed. If it puts in another way, it will be style portion a of a character.₂Portion c to which the space which only four lines are estranged from Bottom lineb of The line, and arose by such estrangement extends under the height equivalent to four lines (2x2)₂It receives. the last -- the -- as for the alignment method shown inc [ 1 ] figure, a line has 1H (E) and 2H character (Lyon) -- moreover -- at least one 2 -- it is adopted when H characters (y) are small letters. This alignment method, body part a of 2H character₃The portion which at least side carries out only three line segments about Bottom line b of To, and is prolonged below like y of the 1st the c figure is one Bottom linee.₃It comes out and expresses. As for Bottom line f of 1H character (E) which exists in a line, at least side is carried out only two lines from Bottom lineb of the line like the standard of the 1st the a figure. however -- since the bias position for such 1H and 2 H characters is restricted to one line -- an observer -- an intermediary -- it does not become offensive to the eye. The knowledge of two parameters about the line which is the target of consideration is needed for selection in such the position Matching method or position Matching mode. 1st parameter AL1 is related for whether being the simultaneous existence of 1H and 2H character, and parameter ALof The 2nd2 is related for whether being existence of the small letter of 2H, and it is used. In order to demarcate separation with parameters AL1 and AL2 clear between the characters of inheritance A row, it is determined by reading the character data of a line during [ one ] the scanning of the 1st line of a line. Drawing 2 shows the device which enables consideration of the above-mentioned parameters AL1 and AL2 when choosing position Matching mode. The device shown in Drawing 2 has PROM memory 1 which reads to character generator 2 via these four intermediaries' conductors AGC1 thru/or AGC4 to control in position Matching mode, and generates a sequence. Memory 1 receives the line address of the line under consideration which is within the limits of 0 thru/or 9 via four conductors ADL1 thru/or ADL4. This line address is supplied from the line calculating machine by which increment is carried out by each line synchronization pulse. Memory 1 receives signal S/which displays whether a line is an upper half of the line of twice as many height as this, or it is a lower half on signal 2H which indicates that the read character has twice as many height as this, and a row. A memory receives signals AL1 and AL2 derived from flip flops 3 and 4, respectively. Flip flops 3 and 4 are JK type flip flops. Input J of this flip flop is "O." The input of a flip flop receives signal 2H which indicates that the read character is a 2H character. Input P of the flip flop (preset input) is connected to and gate 5 which undergoes the output from and gate 6. Signal LGN10 which appears at the time of the scan of line synchronization pulse TLG and the 10th line of each line is impressed to and gate 6. Gate 5 receives interval signal S/which is "1" during twice [ further ] as many reading in the lower half of the line of height as this. Therefore, the signal supplied to input P switches to "0" states by generating of the line synchronization pulse of the line of the last of the line preceded with the line read. When signal S/changes in the lower half from the upper half of the line of one times the height of two, it prevents the change which is not desirable as for the state of flip flop 3. Clock signal H is supplied to flip flop 3 by each character time slot. The output of flip flop 3 switches to "1" state by generating of line synchronization pulse TLG of line LGN10 of the last of the line of precedence, and when the character of all the Why of this line is 2H, it stops at this state. However, at least one switches to the state "0" of signal 2H, when a character is 1H. In that case, output Q switches to "0." Input edge P of flip flop 4 is connected to the outgoing end of and gate 5. Input edges J and H are connected like the case of flip flop 3. An input edge receives signal 2H in one input edge, and is connected to and gate 7 where other input edges are connected to and gate 8. And gate 8 receives signal BITphi which is supplied from a character generator, reads and indicates that a character is a small letter, and signal LGNphi which reads and indicates that an inner line is the 1st line of a line. position Matching mode in case signal AL1 is "1" -- the -- it is the mode shown inb [ 1 ] figure. the time of signal AL1 being "0" and signal AL2 being "0" -- position Matching mode -- the -- it came to be shown ina [ 1 ] figure. the time of finally signal AL1 being [ signal AL2 ] "1" in "0" -- position Matching -- the -- it comes to be shown inc [ 1 ] figure.

[Brief Description of the Drawings]

the -- the [a / 1 / figure thru/or ] --c [ 1 ] figure shows the example in various position Matching modes by the present invention -- and Drawing 2 -- the -- the [a / 1 / figure thru/or ] -- it is a block diagram of the device for attaining position Matching mode toc [ 1 ] figure. 1 ...... PROM memory, 2 ...... a character generator and 3, 4 ...... a flip flop and 5, 7 ...... an and gate and 6, 8 ...... and gate.