DE1816041B2 - MAGNETIC TAPE DEVICE FOR RECORDING AND OR REPLAYING TELEVISION SIGNALS - Google Patents

Description

When transmitting television signals, in with the pulse separator 2 in series and is the the so-called '., transmission link 3 connected in parallel with today's standard television technology, the one Interlace method applied, in which first signal input 4 for the one not shown only the odd numbered lines (first field) and magnetic tape scanned television signals and one then the even-numbered lines (second field) 5 with a television, also not shown the complete television picture is transmitted to the receiver has signal output 5 connected, the, which in the reproduction of the two fields in the embodiment shown in Fig. 1

intermesh like a comb. Because according to today, the correction circuit 1 consists of an integrator Television standards each field in the same level 6, which has a Schmitt trigger 7 with a Height begins, each field receives the same io input of an AND circuit 8, whose Number of lines plus half a line. A completely different input with the output one with the TV picture therefore always consists of a whole, yertical sync pulse frequency, symmetrically odd Number of "lines. For the same reason controlled bistable flip-flop 9 is connected. meet those belonging to each field, to the output of the AND circuit 8 leads to control the vertical frequency of the television receiver 15 output of a monostable multivibrator 10, whose gers required Vmicalsynchronous impulses once at the fallback time is equal to the duration of half a line. Beginning of a line and once in the middle of a. The mode of operation of this circuit is based on

Line a. . . . · ^ _ΕΓ b _e k: _annten fact that with commercially available

The invention relates to a magnetic tape recorder for television receivers which record the image flipping operation and / or playback of after the solving vertical deflection oscillator not immediately after Interlaced television signals transmitted, the arrival of the first vertical synchronous part of the in connection with a television receiver, but usually not until the third one is driven and in the case of recording mode only partial pulse. But it is quite possible already every second field with the associated synchronous the first vertical synchronous partial pulse from the pulses to recognize 25 television signal by means of a rotating magnetic head. The detection is already is recorded, which is possible in playback mode when the partial pulse divides the line synchro rotating magnetic heads only slightly exceeds twice the post-pulse duration. For each other is scanned. identification is a Schmitt trigger 7 is used, the

Such devices, which are formed for this purpose according to the so-called half because of its extremely short switching time work are already known. With 3 ° is suitable.

These devices can normally not have a line The control of the bistable flip-flop 9

jump can be achieved. This is because it occurs in the present exemplary embodiment through Playback mode a phase jump from one taken from the output of the Schmitt trigger 7 half a line because only every other field with the vertical sync pulses, however, are for this associated vertical sync pulse recorded 35 control system also uses the head switching pulses, which is either at the beginning or in the middle bar. The bistable flip-flop 9 controls the AND one Row is located while in a complete circuit 8 in such a way that it only occurs when it arrives Television picture contains two vertical sync pulses every second vertical sync pulse opened and are alternating at the beginning and in the middle when each first vertical synchronous one arrives Start line. The double sampling of the 40 pulse is closed. Every second from Schmittseiben Vertical sync pulse leads to a vertical sync pulse that is recognized early in the case of the loading trigger Known devices that the twice scanned, .-. triggers the monostable multivibrator 10, the Field in the television receiver the same tracks a pulse of the duration of half a line strokes. So there is a relative output that emits the remaining partial pulse directly roughly rasterized image without interlacing. 45 suppressed. Through this oppression arises

The invention is based on the problem of practically an additional line pulse. The so Playback mode with a vertical sync pulse corrected after the field is activated at the method working photo tape recorder in an attached summation point 11 back into the associated, on television receivers included a complete television television image processi «hd running through transmission path 3 odd number of lines displayed after 50 signal, and the image tilting process in to generate the interlace method. ι. TV receiver is thus half a line

The invention solves this problem in that delayed. The television receiver is thus offered the Wnchronsignal separated out in a pulse separation stage from the from the magnetic signal output 5 a quasi-norm-compliant vertical band scanned television signal, which is used to generate a Si Zei ii ^

g g

Synchronization pulses: ejgex correction circuit supplied: 55 interlace is suitable. ^

are whose circuit elements are dimensioned and an- The correction circuit 1 of the in F i g. 2 shown

are arranged so that the arrival of the exemplary embodiment set up contains a first

shown field belonging vertical synchronous AND circuit 12, the first input directly

pulse is recognized in good time that it is connected to the output line of the pulse separation stage

every other sample, connected to the duration of half a ^6o . A second input of the AND

Line shifted, the television circuit 12 to be reproduced is via two mono- _{] r} connected in series.

signal is mixed in again before the vertically stable flip-flops Kl and Kl with the off, .-;,! '

deflection oscillator of the connected television receiving line connected to the pulse separator 2, ζ .

gers appeals. The tilt back time of the monostable multivibrator ^, _{

Two embodiments of the invention are in 65 K 1 is 29 μβεσ, and the tilt back time of the second ^ ₊

the drawing and are shown in the following monostable flip-flop Kl is 6 μβεο. To Co

explained in more detail. Both in FIG. 1 and 2, the output of the first AND circuit 12 is a |. _s

Embodiments is a correction circuit 1 third monostable multivibrator K3 of one, _i

Claims (10)

1 Bl 6 041 3 4 Flip-back time yon'96 μβεο and a fourth mono flip-flop circuits TCl and K2 is located. The time; from stable flip-flop with a flip-back time * of 480 μβεο corresponds roughly to the entire image pulse-128 μβεο connected in parallel. The output of the duration during the sync pulses with double first AND circuit 12 also controls a line frequency occur. The disabling of the AND fifth monostable flip-flop KS with a j5 circuit 12 during the vertical blanking time is a back flip time of 480 μβεσ, the output of which is required because each pulse that arrives in the middle between two line a negated input of the first AND line sync pulses, each Circuit 12 is supplied. The third #nd fourth after which fields are recorded on the magnetic tape flip-flops K3 and K4 each control an input, from the first or second level of a second and third AND circuit 13 * q banten triggered flip-flops K3 and £ 4 and 14 . The other input of the AND circuit would trigger and thus the function of the switches 13 and 14 would be disturbed by the output with the vertical direction. The frequency symmetrically controlled bistable toggle-bistable toggle circuit 15 controlled symmetrically with the vertical sync pulse frequency. The stage alternately opens the AND circuits output line of the second and third AND circuit 15 13 and 14, the outputs of which are connected to the inputs of a 13 and 14 are connected to the inputs of an OR-OR circuit and are alternately connected to circuit 16 ″ The output line that controls the monostable multivibrator \ K 6, which emits an OR circuit 16 in the execution pulse shown with a line length that corresponds to the video signal passing through, for example with the input of a sixth mono transmission path, to the stable multivibrator K 6 with a tilt back time 20 of the summation point 11 is mixed again. The connected by a line duration, the output time difference of the line from the flip-flop X 3 and. 2 £ 4 line at the summation point 11 again corresponds to the transmitted pulses with 32 ^ sec The transmission path 3 for the television signal is supplied with a duration of half a line, so that the television is shown catcher at the signal output. 5 is a quasi standard drawing, which is shown in dashed lines in the drawing 25 just vertical sync signal is offered, with. The AND circuit 17 corresponding to the a Zeilensprüng can be carried out with an input and the output between the two in series, the monostable multivibrator K 6, which emits a pulse of horizontal monostables Kl and a line length, is provided to a K 2 is provided, the negated input replaces the proper functioning of the circuit independent AND Schalturtg 12 and has a negated input 30 depending on whether on the magnetic gear, the one with the output line of the monostable band a field with even or odd Toggle circuit K 5 with 480 μβεσ backward tipping time ver the number of lines with the respective associated vertical bundles. sync pulse is recorded. The by the on-the operation of the circuit arrangement after masking a pulse of a line length yer-Eig. 2 is based on the fact that if the line rhythm is overly disrupted, normal television signals must be carried before the one, especially since the phase discriminators in television receivers consist of five broad partial pulses, with relatively large time constants, the vertical synchronizing pulse initially narrow preliminary work . '
satellites occur whose pulse repetition frequency is the same. In addition to the embodiment described here, the double "line frequency. With this, it would also be possible, for example, to reproduce the entire video according to whether the image signal lying in front of the satellites at the time required to detect the vertical with half a line frequency or a whole line ceases to require synchronizing impulses, including the delay of either the first or the second prelimiter time, which is known to correct the image impulses and is thus the beginning of the actual vertical. '. · - ^.:
synchronous pulse can be determined. ; 45 The correction method according to the invention, the 'The above in the Impulsabtrennstufe 2 from the television for by means of rotating magnetic _heads: on signal · separate line pulses launched successively magnetic tape recorded television signals bescnriedie'monöstabilen multivibrators Kl and K 2 is ben with one, can, of course; also for other tilting back times of 29 or :: 6 μβέΰ. Between two line impulses or impinging on other recording media, "television signals" are drawn for a period of 50 times, of 6 μβεϋ, during which the flip-flop Kl are an example of the recording process Emits impulse, the arrival of a Vorrabanten in -by means of a fixed magnetic head or round, the AND circuit 12 is expected. The flip-flop stage K 2 'i;: plate-shaped recording medium or core memory with 6 μβεϋ flip-back time is used for suppression ". As a recording medium,
of glitches that may occur between the 55 "·· t," Line pulses can occur. When patent claims occur: of a satellite within the 6 μβεϋ pulse duration 1st magnetic tape recorder for recording and / of the monostable flip-flop K 2 gives the AND-switching or Wi8d8rgabe from after the interlaced processing an output signal, with which the two procedures transfer8n8n television signals, which in parallel monostable flip-flops K 3 60 connection with a television receiver and K 4 are triggered and a pulse is driven and in the case of recording b8tri8b 96 or 128> S8C donate. At the same time, only every two fields with αεη belong to it Output signal of the AND circuit 12, the bistable sync pulses rotating by means of είηεβ Triggered toggle switch K 6, which records a pulse from the magnetic head, which emits at least 480 μβεϋ duration, which was driven to εΐηεη 65 by means of two rotating magnet negatives The input of the AND circuit 12 is scanned back two times in a row, or on the n8gi8rt8n input of a characterized in that the in TJND circuit 17 is given, which between a pulse separator (2) from the from I 816 Be separated sync pulses of a correction circuit (1) supplied to the circuit elements are sized and arranged such ^that; magnetic tape scanned television signal ^challenges: - the arrival of the vertical sync pulse belonging to a recorded field is recognized in good time that it is shifted by half a line every second scan and mixed back into the television signal to be reproduced before the vertical deflection oscillator of the connected television receiver responds. 2. Magnetic tape device according to claim 1, characterized in that the pulse separation stage (2) and the correction circuit (1) are in series and the transmission path (3) of the magnetic tape sampled television signal are connected in parallel. 3. Magnetic tape device according to claim 1, characterized in that the correction circuit (1) consists of an integration stage (6), which has a Schmitt trigger (7) with an input of a AND circuit (8) is connected, the other input of which is connected to the output of one with the vertical synchronous pulse frequency symmetrically controlled bistable multivibrator (9) is connected, and that the output of the AND circuit (8) is connected to a monostable multivibrator (10), the flip-back time of which is equal to the duration half a line, and that depending on the position of the bistable trigger circuit (9) only every second vertical sync pulse triggers the monostable multivibrator (10) and this suppressed for the duration of half a line (FIG. 1). 4. Magnetic tape device according to claim 3, characterized in that for controlling the bistable Toggle switch (9) the vertical sync pulses taken from the output of the Schmitt trigger (7) are used. 5. Magnetic tape recorder according to claim 3, characterized in that for controlling the bistable Toggle switch (9) the head switching pulses are used. 6. Magnetic tape recorder according to claim 2, characterized in that the correction circuit (1) contains a first AND circuit (12), the first input of which is connected directly to the output line of the pulse separation stage (2) and the second input of which via two monostable multivibrators connected in series ( K 1, K2) with a rollback time of 29 or 6 μβεο with the output line of the pulse separation stage (2) is connected that at the output of the first AND circuit (12) a third and fourth monostable multivibrator (K3, KA) with a Fallback time of 96 or 128 μβεο are connected in parallel, and that the output of the first AND circuit (12) simultaneously controls a fifth monostable multivibrator (KS) with a fallback time of at least 480 μββσ, the output line of which is a negated input of the first AND circuit (12) is supplied that the third and fourth flip-flop (K 3, K 4) each control an input of a second and third AND circuit (13, 14) that the other one output of each of these two AND circuits (13, 14) from the output of a symmetrically controlled with the vertical sync pulse frequency bistable flip-flop (15) is alternately controlled depending on their position and that the output lines of the second and third AND circuit (13, 14) with the inputs of an OR circuit (16) are connected, from whose output the corrected vertical sync pulse is taken and added to the television signal (F i g. 2). 7. Magnetic tape recorder according to claim 6, characterized in that the OR circuit (16) is followed by a sixth monostable multivibrator (K 6) with a rollback time of a line duration, from the output of which the corrected vertical sync pulse is removed and added to the television signal. 8. Magnetic tape device according to claim 6 or 7, characterized in that for the control the bistable flip-flop (15) the corrected vertical sync pulses are used. 9. Magnetic tape device according to claim 6 or 7, characterized in that for the control the bistable flip-flop (15) the head switching pulses are used. 10. Magnetic tape recorder according to claim 6, characterized in that between the two series monostable multivibrators (Kl, K2) a fourth AND circuit (17) is provided with a negated input, with which the output line of the monostable multivibrator (KS) with 480 μβεο tilt back time is connected. 1 sheet of drawings