DE1929083C - Circuit arrangement for shifting additional message signals into other line spaces of a television signal - Google Patents

Description

1 2

The invention relates to a circuit arrangement in use, the Rüeklaufstrahlausta works

for the postponement of additional news services, however, not in such a way that for these receptions

signals in other line spaces of a television signal, the beam full during the picture rewind

is controlled with a circuit for generating a dark together, so that the during this

set television signal, which image and line 5 additional signals transmitted an undesirable «

alternating pulses within the vertical blanking inter- brightness modulation of the vertical return line

contains valls and with which additional signals have a definite sequence. In particular, this ModuLitior falls

th places of this blanking interval are inserted. on when the additional message signals in the dre

An arrangement of this type is particularly suitable for inserting line spaces which

for the transmission of special messages to remote io equal pulse interval after vertical synchronization

Follow the participants using the pre-pulse period.

those plants, without thereby affecting the regular pro-n; _e object of the invention consists in the Ver

gram transmission is disturbed. 'avoidance of such disturbing phenomena. Especially

A system that allows such a transmission to take place in the vertical blanking interval of the remote

allowed, is already contained in the French patent 15 sehsynchronisiersignals surveillance si

1 519 545. In one embodiment, _gna Ie are removed, and di <should be used in their place

of this system, the additional messages will be added to the previous ones

Holding line signals from an auxiliary camera to position the undesired brightness modulation

taken and timed between the calls of a studio. Since the monitoring signals are only used for the

camera-generated main program signals inserted, ao broadcasters and the studio are of interest

This multiplex insertion takes place while certain- it is not required in the receiver at the subscriber

icr sections of the vertical blanking interval in such a way that the position they occupy for dit

The ratio of one line of the additional signal to the additional signals can be made free,

an image of the program signal. _{The ultimate} task is part of a circuit arrangement

in detail, the additional message signals as are used to shift additional messages

inserted during a time interval between gnals in other line spaces of a television signal

two successive horizontal _{synchronizing} pulses with a circuit for generating one together

sen within the ^v ertikalaustastintervalls each television signal, which frame and line

Main program image. The compound alternating pulses within the vertical blanking inter

The signal is then in the usual way 7 ^ m Fmpfänger 30 valls contains and additional signals. at certain

sent. th places of this blanking interval are inserted

At the receiver, additional devices are achieved according to the invention in that with the da;

arranged, which the additional signals from the remaining part of the television signal generating circuit a separator

of the received signal. The additional signals circuit, which with the help of the image and lines

can for example with a cathode ray tube 35 alternating pulses from the blanking interval the addition

removed with a thin screen and a connected electrical signal, the position of which is to be changed

trofax printer recorded while that and a message removal circuit that mi

Main program in the usual way on the picture tube with the help of the picture and line change pulses any light

of the recipient appears. As in the above-mentioned news from those points of the blanking interrupter

Patent specification is described, gives the special channel 40 away where the separated additional signals nei

method ray tube a line of additional information should be inserted, connected and that mi

again, which then on a moving piece of paper of the isolation circuit and the message removal

of the printer. Since the picture tube circuit is connected to an inserting circuit

of the television receiver during the horizontal output which the separated additional signals to the one

blanking interval is controlled, the 45 digits of the blanking interval appears again inserts where before

Additional information is not on it and therefore does not interfere with the distant signals,

the image of the regular image to be seen by the viewer. The circuit according to the invention thus uses to

Program. next a circuit for generating a together

In the conventional television system, the syncronized television signal, which within de ^c

chronisicrsignal pulses for the horizontal and 50 vertical blanking intervals image and line input pulses for

tical synchronization and for beam blanking. the image and line deflection and auxiliary signals ar

Which contains the Veiükalaustast- and sync pulses at predetermined positions of the blanking interval

The holding portion also contains compensating pulses. An isolating circuit is connected to this circuit

which a mutual influence of the horizons, which on the image and line deflection impulse «

IaI and vertical synchronization circuits suppress 55 responds and those auxiliary signals from the λ us

and for a neat inter-shaft sampling interval separates, their position within Ie:

Development of the two fields of an overall television image composite signal should be changed

of worry. In the USA currently in use - the message removal circuit, which one

Norm corresponds to the time of the vertical blanking interval with which the composite television signal is generated

vall about 20 lines, during which the picture display circuit is connected, also becomes:

running of the receiving devices takes place. Part of this is controlled by the image and line deflection pulses

Vertical blanking interval is used to insert and remove any signals from the television signal

Test or monitoring signals for the generation, at those points where the separated signal

Transmission and broadcasting of the television signal are to be reinserted. Finally, the one inserts

turns. These monitoring signals are usually the additional signals that have been separated off

point to the last three lines of the vertical line out of those places in the television signal, ar

iHstinicrvalls inserted. who previously found the distant signals

Hei some older television receivers that still had.

i 929

The invention is based on the representations below an exemplary embodiment explained in more detail.

^{ES adds} la to Id a number of waveforms targeting the images in long-distance transmission * ^UDd _F i _g . 2 is a block diagram of an embodiment of the carrying system

the input terminal 22 is given

will be on

Ä? _au " _d ! _b show (not to scale) the pulse course during the vertical blanking vails for alternating fields of the television signal composed of these. Each d.eser from _tast intervals contains in a known manner Ausgle.chsimpulse 100, Horizontalsynchrommpulse 120 and vertical synchronizing pulses with short 14Θ Impulsluk _k s. The compensation pulses 100 ensure that the vertical synchronization of the television receiver is maintained when the two interleaved fields are transmitted. De torizontalsynchronimpulselM maintain the horizontal synchronization of the receiver during the last section of each vertical blanking interval, and the vertical sync pulses with their short pulse pauses maintain the horizontal synchronization during the vertical blanking. That from the F i g. 1 a and 1 b visible composite television signal is also used for Synchron.-Sg the horizontal deflection of a cathode ray tube with a thin window, as se be. the aforementioned television broadcast reception is used. Here, the composite synchronizing signal additionally contains Hilfsnachnchtenbildsignale, which may be included b for example, in section 16 of the vertical blanking interval shown in Figs. 1 a and 1 ^ The Identidil for Nachr.chtenkategone 22

15th

^ ^^^ enn.e.h-

ίο NEN These three ^{E "SS} ^ f _{a, zusamm} engefaüt, _the adder to a AuJgnpjg ^^

* ^e ' ^che ' 5fL of the combined signal and an additional

ff ^ ir appearing addition in Honzontaiausiasuruci

™ J ^»chtensl ß ™ ''" TL * _{muldbar o} f the patent over £ abel UNMIT output circuit gegeb ™ ^> o We.se to Betrachteruibe ^ in the aforementioned During this * w £ ™ _u ">" _{20 and 25}

present case ™ ^5. " ^{εη dI} ^"' ^B _adds . This is in an additional arrangement e.ngetug

following naher_ ^erl ^ ^t. _Circuit contains a circuit indicated in Fig. 2 _

_a5 SynchroimpulstiennschaUmi ^^

generators 35 and ⁴⁰ . ° '| ^Trennscna ^ ^IU _{A u} ^g sgangsanihrem Emgangsanschluß 31 on the circuit 24 of the au ^^ g V.deoadd.erers 20 serves both the ^{separation, he} d

also the coupling of the vertical components of the synchronizing signal to: Uener 35 and 40 via the Ansdüu-e ^ 37 -J ^ * ££ The generator 35 generates on semem

closing 36 ^^^^^ , intervals 18 to

ve ,,, -

included, which are for the television stations, for the transmission of programs from city to city with Seinsamen Trä'gern and for the television stations of IntereL. It has been shown that monitoring signals can be inserted and transmitted in these line spaces before the start of the actual picture, without interference as a result. tmnew 45 and 50 s.nd, ewe.ls Z ™ f ^ £ stronger, which by de
be that through
generated and the

_b7W " _Nd si

generated and ^ W ^ _den

gers, with disturbing phenomena occurring.

According to the invention, these undesirable

SÄ'SÄiÄ final 47

des ^ amrne "gesemen

* _{on the} Einheil ° _{on the Ein} .

ir _E Ä3i

the television news described above.

With the input terminal 57 of the adder S5 is also a message line delay circuit connected, which in turn via a message line selector 65 to the output terminal 24 of the adder 20 and the output terminal 41 of the gate generator 40 is connected. The line picker 65 selects predetermined additional message lines from the input port 66 supplied composite signal under the control of the gate pulses generated by the unit 40 and its terminal 67 are supplied.

In the arrangement described here, the generator 40 and the line selector 65 work together so that that the additional messages inserted into the line spaces 10 and 12 as an output signal on Terminal 68 are available and fed to the input terminal 61 of the delay circuit 60 will. The delay circuit 60 is set so that the additional messages of the line spaces 10 to 12 are delayed by eight horizontal spaces ao (8 lines) and then from the output terminal 62 reach the input terminal 57 of the signal adder 55.

The output signal delivered by the adder 55, which results from the signals from the units 50 and as 60 composed, contains in the line spaces 18 to 20 of its vertical blanking interval the additional message information, which was previously contained in line spaces 10 to 12. Line spaces 10 and 12 contain no message information more. This signal appears at connection 58 of adder 55.

The output signal of the adder 55 reaches the transmitter or only distribution circuit 25. Since the -Line spaces 10 to 12 no longer contain any message information, there is also no brightness modulation as a result of such signals in television receivers with insufficient return blanking. It has already been mentioned that such undesired modulation by additional messages in the line spaces 18 to 20 does not occur, and as far as the subscriber is concerned, no radio program goes by removing the test signals from the composite television signal which is his Recipient is lost.

The waveforms of FIG. 1 c and 1 ά illustrate the vertical blanking intervals for even and odd fields of the interleaved television signal which is transmitted at the output of the unit 25 of FIG. 2 is available. The transmission of the inserted additional message information from the line spaces 10 to 12 into the line spaces 18 to 20 and the leaving of any information in the line spaces 10 to 12 can easily be seen from these figures.

The invention is described for an application in which additional message signals from a certain part of the vertical blanking interval of the composite television signal in one other specific part is transferred (from the line spaces 10 to 12 to the line spaces 18 to 20); however, the invention is not limited to this. By setting the time control one or both of the gate generators 40 and 45 and / or the delay of the circuit 60 can the additional signals also from one room to any other room within the vertical blanking interval be transmitted. The delay can be such that the additional message signals from a Position in the vertical blanking interval to a corresponding position within the television grid itself he follows. This is of particular interest if the additional transmission is to remain secret or if the receipt is to take place against a participation fee (subscription), in this case the Shift according to a specific or according to a random scheme, with the recovery the additional message only if the shifting scheme is known and programmed can be retrieved in the subscriber's receiver.

Claims (9)

Patent claims: 1. Circuit arrangement for shifting additional message signals into others Line spaces of a television signal, with a circuit for generating a composite Television signal, which image and line change pulses within the vertical blanking interval contains and with the additional signals at certain points this blanking interval are inserted, characterized in that with the generate the television signal Circuit (20) an isolating circuit (65). soft with the help of the image and line change impulses Removes the additional signals (from line spaces 10 to 12) from the blanking interval, whose location is to be changed, and a message removal circuit (45) with With the help of the image and line change impulses, any message from those line spaces (18 to 20) of the blanking interval, where the separated additional signals are reinserted are connected and that with the separation circuit (65) and the message removal circuit (45) an inserting circuit (55) is connected, which the separated television signals reinserted in those line spaces (18 to 20) of the blanking interval where previously the distant signals have been. 2. Circuit arrangement according to claim 1, characterized in that the isolating circuit (65), the message removal circuit (45) and the insertion circuit (55) the separated Add additional signals to line spaces which are temporally after those line spaces in which they were previously included. 3. Circuit arrangement according to claim 1 or 2, characterized in that the of the Circuit (20) for generating the composite television signal in the vertical blanking interval inserted additional signals, the position of which is to be changed, are line signals, which are an additional Represent television news information. 4. Circuit arrangement according to claim 3, characterized in that the isolating circuit (65), the message removal circuit (45 " and the insertion circuit (55) the separated additional signals in a new lag « insert again within the vertical blanking interval. 5. Circuit arrangement according to claim 3, characterized in that the disconnector (65). the message removal policy (45 and the F. addition circuit (55) the auxiliary service 2183 from one closer to the beginning of the vertical oustaslintemill run away from the location and at a closer to the end of this blanking interval Insert I.age again. 6. The circuit arrangement according to claim 4 or 5, characterized in that the separating circuit comprises a first gate generator (4P) for generating a first control pulse to coincides with those places (10 to 12) together within the vertical blanking interval. At which the Additional signals to be separated are located, and that the separating circuit also contains a message line selection sound (65) to which the composite television signal is fed and which, with the aid of the first control pulse, separates the additional signals to be arranged at another point within the blanking interval. 7. Circuit arrangement according to claim 6, characterized in that the Nachrichtenentfer- ao voltage circuit a second gate generator (35) which delivers second control pulses, the coincide in time with those points (1.8 to 20) of the vertical blanking interval which the separated additional signals are to be reinserted, and also a message line deletion circuit (45) to which the composite television signal is supplied is and with the help of the second control pulses those additional signals from the Places (18 to 20) of the blanking interval removed, where the signals to be shifted are newly inserted should be, and that this message line removal circuit (45) supplies the rest of the signal at its output (48). 8. Circuit arrangement according to claim 7, characterized in that the insertion circuit (55. 60) a delay circuit (6 »ß). those with the message line selector (65) is connected and delays the additional signals selected for the shift by a period of time, which corresponds to the difference in digits in the vertical blanking signal, which between the separation point (10 to 12) and the new insertion point (18 to 20), and also an adder circuit (55) which communicates with the message line removal circuit (45) and the delay circuit (60) for inserting the delayed additional signal to the remainder of the television signal which is present at the output (48). 9. Circuit arrangement according to claim 8, wherein the vertical blanking interval is first and contains second compensation pulse periods which are comparable to a sync pulse period Duration are separated, characterized in that the separating circuit (35, 40, 65), the after rich deletion circuit (45, 50) and the insertion circuit (55, 60) originally described in the proximity of the end of one of the first or second compensation pulses further additional signals relocate away from the beginning of this interval. 1 sheet of drawings 209 614 / 30Q 2 ^