DE2212567A1 - Method and device for command transmission in television systems - Google Patents

Description

Industry Ao Zanussi S.p.A. Pordenone / Italy

Method and device for command transmission at Feraseh-

species

The invention relates to a method and a device for transmitting commands in television systems with closed Ribbon.

In the German patent .... (German patent application P 20 45 340.I) of the same applicant is a method and a device for transmitting commands (such as horizontal and vertical shift commands for the TV camera and the three variables of the object lens, such as focal length * aperture and feed, related commands) from the control room to the recording location of a television system with a closed loop. Through this It is possible to use the coaxial cable for the video signal lines added, the required number of which is equal to the number of transmitted commands

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and to use only the coaxial cable to transmit these commands from the control room to the recording station At the same time synchronization between the TV camera recording stage and the signals transmitted to it from the control or control location as a result and automatically made that a predetermined number of line sync pulses from the from the recording location to the Video signal transmitted to the control station is selected, that the selected pulses are transmitted to the recording location and that the selected pulses accordingly counted and the counted number is converted into a signal having a value and an intended use, which are a function of the number counted.

Furthermore, in the Italian patent application No. 26896A / 70 dated July 2, 1970 by the same applicant an intercom system described with a television system, in which a building entrance hall with various apartments in the Lines connecting buildings are reduced to a single line even if the various lines are on this one Line of transmitted signals (video, sound, call and door opener signals) be kept separate from each other *

With respect to the ringing signal, a central unit located at the receiving station comprises a number of push buttons, the operate an oscillator so that it oscillates at different frequencies which are a function of the particular push button pressed to any tent.

It can be seen that such a difference between the various frequencies is how to achieve the selection an apartment is required, a restriction or at least a constructive impediment (the result

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is an increase in the investment costs) in relation to the oscillating circuits of the oscillator in the case where the The building with the intercom system with the television system includes a large number of apartments * it would be desirable to create a system with a less critical mode of operation that gives the possibility of “on the same cable send out a larger number of commands.

The invention is based on the problem of «the problem of Sending signals from the recording location to the selected control location in a simple and economically acceptable manner Way to solve for a closed loop television system. For example, a hoof signal should be used in an intercom system with the television system using the same coaxial cable that is used for the transmission of the video signal is used. The aim is to provide an improved system for transmitting the call signal in an intercom system can be created with television equipment, the structure of which is simple and inexpensive, and its operation is completely reliable is.

Based on a method of the type mentioned at the outset, this object is achieved according to the invention in that each Receiving location in advance of a predetermined pulse of the line synchronizer pulse train contained in the transmitting video signal assigned 1st »In connection with each command imprinted at the recording location, a is assigned to the selected The coded pulse assigned to the receiving location is transmitted, the coded pulse being detected and at the selected receiving location is compared with the pulses of the transmitted video signal, so that a call signal is generated at this receiving location.

A device according to the invention for performing this method comprises devices for assigning each receiving

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ortee su a selected «in the transmitted video signal contained line synchronization pulse, facilities «ur Coding of this assigned to the selected receiving location Impulse, facilities for performing the detection and Detection of the coded pulse to the selected Eepfangsort and means for generating a call signal as Result of the detection of the coded pulse, the coding of the pulses is preferably carried out by lowering the level of the impulses carried out with the help of a suitable Misoh summing hold

Further advantages and details of the invention result from the sub-claims *

The invention is described below with reference to one in the drawing illustrated embodiment explained in more detail

In the drawing show:

Pig · 1 shows the block diagram of the transmission unit of the device according to the invention;

2 shows the block diagram in solid lines

one of the receiving units of the device according to the invention and in dashed lines the changes to the circuit in the Pail «in which several receiving units are provided}

Fig. 3 superimposed representations of the changes in the logic levels of the components of the devices according to FIGS. 1 and 2

The transmitter unit shown in FIG. 1 is the only one in FIG entire system provided transmission unit and 1st in the

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'Entrance hall of the building »in which the system is installed» arranged according to the television camera (not shown). The output of the television camera is connected to an impulse separator 5 "whose output signal is to an integrator and pulse shaper 6" © iaea output of a gate element * 10 and an inverter I? s » ^{e is} led» The output of the integrator and InptilefenMni is with a number of Fllp ^ Flop ^ Soh & ltungen (In the example shown, three flip <-Flop> lines 7 * B ₉ linked «which are interconnected in such a way ® ± aA, aa § they form a binary counter «The output of the 1st connected to an inverter 11» fitap circuit 7 controlled by «Bin sw @ lt @? Input is with one input of the Fllp * Flo | i-3o & uüLt« ms whose other output 91 is gang 71 Flip-flop Söfealfetaig first input of both rend the second output T ^ an input, a gate @ Krat @ s rather way, the eret® device 8 controls a second input while the second - output 8S second input aess gate 12, 15, 14, the output of which iiltelaaefe: ⁵ de "a third slngaag saf ^ etc. Je? FQils speaking (not shown") lnf <"Bfm @ Mffi © p? Which is part of a Dmeiteopffelcte 15 is φ B © g> output of gate 12 * 13 «with an input of a wa: from which a second input is connected to sit α @ α ta3gamg <ä @ s * The output -ä @ e Clatters lB sewl® of the television camera via the AntiohlmS% - iet- ai ^ @ te @ F Summlersohaltung 19 verbu & d «n _# di @ <U @ sends signals over a line ·

o / o

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The number of flip-flop positions making up the binary counter is a function of the number of call buttons and thus the number of times these buttons were pressed Gate * Finally (as it is better understood below the number of flip-flop circuits is a function of the number of receiving inputs connected to the cable 20 * mean «

By translating the above definition into mathematical expressions where χ is essential for proper operation of the Device required * number of flip-flops and η is the number of buttons used, the Number of flop-flop events from the following oil result be won"

χ -

This equation k ^ m can be explained taking into account the fact »d && any bistable circuit or flip-flop soh & lttmg« dl «a part of the Bij && rzl (hlere forms» two possible states.? Which generally with "0 * (corresponding to a voltage HuIX .) and with "1 * (corresponding to a positive rake .- · ¹ .ι;: are designated" the counting range of the Hhlera at odds check mtspreebend ettjer power to base 2 »wherein the potency äwedh dia number of bistable circuits is defined; zus £ t% li $ h ma & ZXhlumfang of the counter is at least equal to the number of Buf-Druokknöpfβ be bistable and an additional circuit (9 in the example of FIG »I) required for purposes" which will be explained further below

The reception content shown with solid lines in Fig. 2 is b & ispielswalse the first apartment in

0 8 8 3 3/1121

mm 7 ■ »

Assigned to a building in which the device described is a » built let «earth the signals running over the cable 20 ' a pulse separator 25 supplied, the output with an input of the gate element JO and is connected to an integrating pulse shaping circuit 26, the output of which »it a look! of bistable multivibrator «! (la shown example three bistable multibivrafcoren 27 * 28, 29) connected is »which form a binary counter» which is complete corresponds to the binary counter of the device according to FIG. Am second input of the gate 30 is with an output. 292 of the multivibrator 29 connected »its other output 291 not shelled 1st. The output of the gate j50 controls via an inverter ^ l to the multivibrator 27, one of which Output 271 is connected to an input of a gate element 22 * This gate has two additional inputs to "which is an output 282 of the multivibrator 28 or" via an inverter 21 and an isolating circuit 20 with the Cables 20 * are connected · The output of gate «22 controls the actuation of a signaling device, for example one Bell 22 »

The receiving unit assigned to the second apartment, for example, corresponds completely to the receiving unit described above, with the only change therein consists that the gate 22 is replaced by an identical gate 25 »whose inputs (as shown in dashed lines in the drawing) with the complementary outputs 272 and 281 of the multivibrators 27 and 28 and with the output of the inverter 21 are connected * In the same way the signaling device in the receiving unit assigned to the third apartment is activated by the signal at the output of a gate 24 actuated, the inputs of which with the outputs 271 and 281 each of the ttivibrators 27 and 28 and with the Output of the inverter 21 are connected, as shown in dashed lines in the drawing. The gates 23 and 24

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can control bells such as 23 and Ίλ «

To explain the general mode of operation of the device shown in FIGS. 1 and 2, it is assumed that the idle or zero condition of the counters formed by the flip-flop circuits or multivibrators 7, 8, 9 and Zf, 28, 29 is the logical Levels ^ff 0 ⁿ for the left outputs (Fig. 1 and 2) of all the above-mentioned multivibrators correspond to * In addition, it is assumed * that each of the gates of the 1 and 2 is of the type that the output only has the logic level "0 *" if all the inputs of each gate have the logic level ⁿ l * while for any other combination of the inputs the logic level at the output ^w l ⁿ is * Finally, it is assumed that the actuation of a pushbutton ^{corresponds to the supply of a signal alt to a logic level * l ff} to the respective gate the same symbol, but with a line above this symbol, this signal is to be assumed to be equal and opposite to the corresponding signal "as shown in the drawing; the signal S" is thus equal and opposite to the signal S etc.

As can be seen from FIGS. 1 and 2, the content of the video signal V at connection 4 is converted into a signal S by the specially provided pulse separator 5, as it is formed by the horizontal and vertical synchronizing signals * With the signal V it is necessary to that the first horizontal sync signal with a delay of at least 30 microseconds (this is a function of the operating speed of the binary counter) with respect to the end of the vertical sync pulse

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occurs * The integrating pulse shaper 6 results in a separation of the vertical synchronizing signal SV from the signal S, the binary counter being reset for each field by this synchronizing signal SV * The gate 10 is controlled by the signal S and the second output 92 of the multivibrator 9, where the change in the signal appearing at this output is represented by the symbol F3. After each resetting of the logical level of the signal B is "3 equal to" l ", so that the gate 10 transfers the change of the signal S 'to 55 n on ^ logic level.." Θ is switched "(ie, the fourth pulse); At the output of the gate 10 there is thus a signal SC ₉ which is converted by the inverter 11 into a signal SÜ.This signal then controls the multivibrator 7 of the binary counter, the count of which, as mentioned, reaches the value 3 (d * h The number of pushbuttons), whereupon the gate 10 is locked on the fourth pulse »This prevents» the counter executing a subsequent counting cycle during the period of the same field »The changes in the logic level at the outputs 71 * 81 and 91 of the first The second and third multivibrators of the binary counter are represented by the pulse diagrams B1, B2 and B3 in Fig. 3. The input supplied to each input 12, 13, 14 has the logic level ^H 0 ⁿ when there is no signal from the push button field 15 is sent «If the ζ · Β * the gate 12 corresponding pushbutton is pressed, the gate receives a signal with the level ⁿ l ^N and the output of the gate 12 assumes the level" 0 "because the other two inputs of the gate 12 have the level "1" · Because the outputs of the gates 13 and 14 have remained at the level "1", the common output depends only on the gate 12 £ which is controlled by the signals B1 and 55 and a signal D at the output (see Flg. 3) emits «The signal D is triggered by the

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Inverter 16 converted into a signal D "that together with a signal S derived from the signal S via the inverter 17 "drives the gate 18" at its output Signal P is obtained · The signal P represents the coding Signal which is fed to the mixer 19 together with the video signal V so that the latter has a coded signal VU at the output delivers «which is passed over the cable 20 * and transmitted to the receiving units. The signal W 1st through a decrease of the level of the synchronization pulse corresponding to the selected receiving location, this reduction being determined by the signal P.

In the same way, in the case "in which the corresponding pushbuttons are pressed at the same time", for example the gates 12 and 14 ^ at the common output of the gates 12-13-14, a signal D ** appears together with the signal as described above S ~ controls the gate 18 and forms a coding signal Ψ at the output, a coded signal W (with two characteristic pulses at a lowered level) is thus transmitted via the cable 20 '

As can be seen from FIGS. 2 and 3, in FIG the receiving unit corresponding to the pressed button of the transmitted signal VU (that at a level below that of the pulse separator circuits 5 and 25 works) exclusively derived from the command signal P »which, after being converted into P" by the inverter 21, controls the gate 22 » the operation of the remainder of the circuit of FIG. 2 being substantially the same as that of the corresponding one Circuit part according to Flg. 1 is »since the respectively processed signals VU and V are apparently the same · The gate

through _ ter 22 not only the signal P but also how the corresponding gate 12 of FIG. 1 by the signals Bl

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and SS controlled. As can be seen from the graphic representation according to FIG. 3, all three above-mentioned signals are at a logic level ⁿ 1 "when the command pulse S arrives, the only case in which the gate 22 has a logic output level" 0 " can "The output of gate 22 can" as mentioned above "actuate any conventional signaling device 32"

In the same way, “when the pushbuttons corresponding to gates 12 and 14 according to FIG. 2 are pressed”, the two gates 22 and 24 contained (in the respective receiving units) have a logic level “0” at the outputs ”, with the result in the The two different signaling devices 33 and 34 are actuated and this actuation corresponds to the simultaneous calling of two different apartments

It is easy to understand that with the device described the auxiliary commands transmitted on the cable together with the video signal are synchronized by this « In addition, it is understandable that »the maximum number of command pulses» differ from one another and can be used to call apartments »312 is» that is the number of all horizontal synchronization pulses, which are contained in a field of the video signal «These However, the number is obviously not a limit «

In the device shown in FIGS. 1 and 2, various changes can be made without departing from the scope of the invention «For example, one or Each receiving unit has a number of gate elements 22, 23 » 24 in the case where a number of sound signals or types of reception is desired in each apartment ·

An alternative embodiment of the described

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The same method and the device consists in * that "a Auihaaaeort the mixer-SunaiereohAltung 19 and at each receiving place the separating circuit 20 is omitted * Tatelahlioh relohts it to the coding of the" puleee of "41 · two signals V and P separately transmitted with , for example on two separate cables (which replace the elxisig cable 20 ') and compare this signal & you can reach all quay locations only one tap location is activated to generate the call signal

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Claims (1)

Pat en tanaprüohe: l) A process for commands transmission in watching TV * systems with closed Sohlelfe and a recording location and a number of receiving locations, in particular for the transmission of paging signals in a phone system with television equipment * characterized gekennze i without t, that each of the receiving material to a predetermined pulse of series of line synchronization pulses contained in the transmitted video signal is assigned that a coded pulse assigned to the selected receiving location is transmitted at each time a command is impressed by the recording location * that the coded pulse is assigned to the selected receiving location by comparing the pulse with the pulses of the transmitted video signal is recognized and that a call signal is generated at the same time at this receiving location Method according to claim 1, characterized in that the coding step preferably consists in lowering the level of the impulses assigned to the selected reception location, this lowering being carried out by adding an additional impulse to the video signal transmitted and coming from the reception location "Which is generated by the fact that the lines * equal pulses of a field of the transmitted video signal are derived and that only one of these pulses is newly introduced into the transmitted video signal, U9T is the selected pulse, so that this is algebraic to the corresponding original pulse added 209839/1121 Impulse whose level lowers 3 «Method according to claim 2», characterized in that the levels can be lowered by a number of cell synchronization pulses at the same time, see above that at the same time a number of call signals are generated in the corresponding receiving locations « 4. The method according to claim 2, characterized in that »the call signal is sent to the selected one The receiving location is generated by all of the line synchronization pulses from the signal sent by the recording unit and, separately from this, the pulse with the lowered one Level and that the impulse with lowered « Level is compared with the receiving location, which this »impulse was initially assigned « 5 »Device for carrying out the procedure according to Claim 1, characterized by devices for assigning each receiving location to a predetermined line synchronization pulse contained in the transmitted video signal. Equipment for coding the predetermined impulse assigned to the selected receiving location, Means for performing the detection of the coded pulse in the selected receiving location and means to generate a call signal as a result of the detection of the coded pulse « Device according to Claim 5, characterized in that the devices for assigning each receiving location to a given line synchronicity pulse have a synchronicity separation (5) > a number 209839/1 121 of bistable multivibrator «! (7 * 8 «9) and a number of corresponding gate elements (12, 13, 14) arranged at the recording location and a number of bistable multi * vibrators (27 * 28, 29) and a Qatter (22, 23 * 24) arranged at each receiving location 7. Device according to claim 5, characterized in that the devices for coding the line synchronization module have a push-button field (15) Everything else (bearing element (18) and a Mieoher solar circuit (19)) include those of the receiving unit in a separate order are· 8 «device according to claim 5» thereby I know that the devices for carrying out the recognition of the coded impulse. in each Receiving location a first separation circuit (25) for the line synchronization pulses with a first level and a second Line synchronizing pulse separation neohalvungnait a « below the level of the first lying level 9 · Device according to claim 5 «thereby ^ s- know # dafi the facilities nx * coding of the line synchronization "pu.lB © a pressure field a susKtsllohes Oatterelenent (lS) mni ewei. traguagsleltungen « $ m * i, t * an 'ar around another door that grasp the eüttlertea. 10. · Device jbää ÄEspwieis 5 wafi 9 »Hz ^ swA. © © characterizing t _f tHe "She Eiü ^ iefeteagea ns? leadership, the recognition of the coded liiisilses ia J Bmpfangsort an 209839/1121 which is arranged in the line of the video signal and the line carrying the encoded pulse « 11 · Device according to claim 5 and 6, characterized in that they comprise devices for generating a call signal in each receiving location, the Oatter element assigned to these receiving locations and an acoustic signaling device. 209839/112 1