DE2922527A1 - PROCEDURE AND ARRANGEMENT FOR STORING AND RECALLING DATA DURING PRINT PLATE MANUFACTURING - Google Patents

Description

Description:

The invention relates to the mapping of data onto photosensitive Areas, for example printing plates, in particular on a method and an arrangement for storing the data on a medium from which they can be retrieved.

It is desirable when printing newspapers and the like and at times necessary to reproduce the plates from which certain pages will be printed. This is for example necessary if the original plates are lost or damaged. For plates made with a laser plate making system, generally no negative present to be retained and used to make new plates as in the older photographic plate-making process can be used. If the collated pages from which the original panels were made don't are no longer available, the disks can no longer be reproduced unless new adjustments have been made or possibly from copies printed with the original plates. The problem is worse when the Plates are produced by a computer-fed laser plate-making actuator assembly, at least a portion of which the data comes from the memory of the computer. Because of the cost and limited capacity of the computer memory, the data erased shortly after each disk was made, freeing up memory for other purposes.

The invention is based on the problem of the shortcomings and disadvantages to eliminate the prior art. In particular, a method and an arrangement for storing and retrieving or for the recovery of ■ data during plate production that enable lost or damaged printing plates to be recovered.

The invention provides a back-up arrangement and a method for laser plate making assembly specified both by a computer operated locally, the one for the disks

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certain data are stored on a videotape from which they can be easily retrieved or recalled. The video tape recorder contains a helical scanning head, and the data is from the raster format of the plate maker transformed into the helical scanning format of the video recorder. The data is recorded in a two-phase modulated form, which can be easily modulated and allows easy recovery of the original support. The videorecorder is via an interface with a computer and a time code generator for quick access to the desired Strings connected.

Other objects, features and advantages of the invention will emerge from the following description of the embodiment shown in the drawing. Show it:

1 shows the functional block diagram of an inventive Data storage arrangement of disk making devices;

Fig. 2

and 3 block diagrams of parts of the interface unit of the arrangement of FIG. 1;

Fig. 4 is a graphical representation of data formats of the disk recorder and the video recorder of the arrangement of FIG. 1;

5 shows a timing diagram for explaining the coding of the recorded data to identify the beginning of a new scan line;

Fig. 6 is a functional block diagram for the recording operation of the video recorder in an exemplary embodiment of the arrangement of FIG. 1;

7 shows different signal curves to explain the inventive two-phase modulation;

8 shows a functional block diagram for the playback operation of the video recorder according to an embodiment of the arrangement of Fig. 1;

9 shows the block diagram of an exemplary embodiment of a demodulator for use in the playback device

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of Fig. 8;

Fig. 10 is a block diagram of a circuit for recovering the reference clock or carrier signal from the recorded Signal in the arrangement of FIG. 1;

11 shows various signal curves in the diagram for explanation the operation of the circuit of Figure 10;

Flg. FIG. 12 shows the block diagram of a further embodiment of a demodulator for the playback arrangement of FIG Fig. 8;

13 shows various signal curves in the diagram for explanation the operation of the modulator in Figure 12;

14 is a functional block diagram for the video recorder recording carried out in a second embodiment of the arrangement of FIG. 1; and

Fig. 15 is a functional block diagram for playback operation of the video recorder of the second embodiment of the arrangement according to claim 1.

The arrangement of Fig. 1 includes a laser plate maker, for example in accordance with earlier US patent application 758 250. This device contains reading and writing laser beams that simultaneously Scan input and output surfaces, the writing beam reproducing the image scanned by the reading beam. Likewise, a Plattenherstellgsrät used according to the earlier US patent application 912 505, which has an interface with a computer connected is. The data can be retrieved from the reading beam of the plate maker to liechner and from the computer to the writing beam of the record maker. Such an arrangement can work in three modes, firstly in local mode, in which the data scanned by the reading beam from the The write beam can be mapped, secondly, in computer mode, in the only data from the computer are mapped, and thirdly in mixed operation, in which the data from both the computer and can be mapped from the reading surface.

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According to FIG. 1, the arrangement also contains a computer 17 a connection point 18, a serial interface 19 and one Para.llel - Schriittstel.Le 21. The computer is preferably around the microcomputer 11/03 of the Digital Equipment Corporation with a word comprising 1G bits and an internal one 8K memory. The connection point 18 is the device Silent 700 from Texas Instruments Corporation, at the Interface 19 to the device DRVII and at the interface 21 to the device DRVII of the Digital Equipment Coloration.

The arrangement also contains a time code generator 22, a video recorder 23 and an interface 24. Preferably acts The Eeitcode generator is the Data-Chron 3074 device, which supplies a 30-bit time code signal which is encoded according to the standard IRIGB code, which indicates the day of the year The hour, minute and seconds at which the recording was made he follows. This signal is fed to the video recorder 23 and recorded serially in an audio track on the tape. Of the Time code generator 22 also contains a device for reading time code signals from the video recorder and for controlling dos Recorder in such a way that it searches for a given time code which is transmitted via the computer or via connected to the side code generator Switch can be entered.

The video recorder 23 contains a helical scanning head for recording and reproducing (playback) the video information. The recorder also contains one or more heads for recording and reproducing sound information on a straight track of the video tape. The video recorder acts it is preferred; r. ·: ·. Model 815 from International Video Corporation, which has been converted to two-phase modulation of the video data in the manner described below.

The helical scanning is useful because it provides a sufficient bandwidth for the transmission speed

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Is available with which the plate-making facility works (5.1 MHz) and the achieved density of the recording on the tape is relatively high. With a standardized video tape the device records about 40 pages of normal newspaper size. In addition, the video recorder has a fast forward and reverse speed, which allow access to any recorded page within two or three minutes. With others Recorder types require 30 to 60 minutes to access a particular page.

The interface 24 forms a connection between the computer and the plate-making device, the time code generator and the video recorder. The control and status signals for the Disk production equipment runs through this unit, as do the control and status signals for the recorder. Additionally the interface 24 forms the connection between the 16-bit format of the computer and the 32-bit format of the time code generator 22. To transmit the data, the control and the status signals from the computer to the plate production device, to In the time code generator and recorder, the interface unit 24 contains eight-bit registers 30 to 37 and an output register selection decoder 38. Eight bits of the 16-bit computer word are used for data, three for register selection; the the remaining 5 bits remain unused. The data is fed to all registers at the same time, but only into the register entered, which was selected by the signals supplied to the decoder 38. According to Fig. 2, the register 30 contains interrupt masks, if necessary in a conventional manner can be used to interrupt the computer, for example if one of the peripheral devices is to receive data or a command is not ready. The registers 31 to 35 contain the data for the different positions of the time code signal, for example the hundreds of days, tens of hours, etc. The register 36 contains the control signals for the disk maker and the video recorder; the re-

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gister 37 contains the control signals for the time code generator. Not all bits of each register are used.

According to FIG. 3, the interface 24 contains eight bits Registers 40 to 46 which are used to transfer data, interrupt and status signals to the computer. Dieyj Registers are selectively driven for output by an input register selection decoder 48, which receives selection signals from the computer register receives. The data are transmitted from the registers on a data rail 49 to the computer, which from the same Data rail can exist, which is used to output data from the computer, for example the data rail 39 of FIG. 2.

Operation and use of the entire arrangement and thus the method according to the invention proceed as follows. the Arbsiti.befeh.le are made by the operator via the connection point 18 the computer for execution and transmission to the plate making facility, time code generator and video recorder guided. The arrangement has two basic modes of operation, namely recording and reproduction. When recording will be the data is fed from the disk maker to the video recorder. These data can either be data from the Read beam scanned copy on the read disk or data that control the modulation of the write beam. The data from the plate making device to the helical scanned video tracks of the videotape recorded. The index signals from the time code generator are recorded on a sound track, so that the recorded data can be accessed quickly. These signals describe the day and time of recording each Side and form a unique address for this string. The way in which the data is sent to the plate making facility transmitted to the video recorder and recorded is explained in detail below.

During playback, the data is rewritten for a desired page and the write beam control of the plate manufacturer

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provided means for creating a new disk containing the data. The page to be reproduced is taken from the Operator determined, either via the computer connection point or via a group of switches assigned by the time code generator 22. The time code generator 22 then searches for the desired time code on the tape, with the time code generator controlling the VCR and tape movement steers at high speed in the right direction. If the desired time code is found, the recorder will open normal playback speed is switched, and the data for the page associated with the time code becomes the printing plate making device transfer.

In the printing plate making device, the data is read in successive scan lines at a constant bit rate. In a presently preferred embodiment, the bit rate is 5.1 MHz, with each scan line containing 14x1024 bits. In the video recorder, the data is recorded in a helical manner, with a helical scan taking place per revolution of the recording head. Between successive scans there is a dead or unused area that arises as the head crosses the tape in the opposite direction. In a presently preferred embodiment, the recording head rotates at a speed of 60 rpm and the data is recorded at a bit rate of 5.8 MHz. The relationship between the plate making equipment data format and ae.r. ·. Recorder is shown in FIG. Thereafter, six scanning lines of the data (LS1 to LS6) of the printing plate making device are recorded in each helical scan line 51 within a time of 14.6 ms; the dead time between successive scans is 2 ms. The video recorder generates vertical sync pulses 53 in the middle of the dead times.

The recorded data are encoded in such a way - that the beginning

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that can know the data for each scan line. The way The manner in which the data is encoded for this purpose is shown in the timing diagram of FIG. During the 2 ms interval Signals representing zero are recorded on the tape between successive scan lines. the actual return time is less than 2 ms, e.g. 0.5 ms, and the zero signals are recorded during the intervals 56,57 before and after the actual dead area 58. Successive signals representing values of 1 are recorded during the first four bits of the new scan line, as shown at 59. Thus, the start of the new line is through the first transition of the data after the failure interval Are defined.

Referring to Fig. 6, the data is from the plate maker with the plate-making facility's reference clock frequency of 5.1 MHz inserted into a ring memory 61. The data are read out from the ring memory 61 at the clock frequency of the video recorder of 5.8 MHz. The ring memory 61 contains eight 4K shift registers. The 2 ms intervals between the touch lines of the video recorder prevent the data from disappearing from the ring buffer 61, although the output frequency exceeds the input frequency. The output of the ring memory 61 is connected to a two-phase modulator an EXCLUSIVE OR gate 62 and a D flip-flop 63 connected. The output of the ring memory 61 is on connected to the inverting input of the gate 62 and the output of this Gaccers with the D input of the flip-flop tied together. The 5, -S-MH "carrier or clock signal becomes the T input of the flip-flop 63 supplied; its output is connected to the second input of the EXCLUSIVE OR gate 62. The output of the flip-flop is also connected to the input of a video driver 64, the output of which is connected to the recording head 65 is connected.

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The feeding of the 5.8 MHz clock pulses to the ring memory 61 is controlled by a gate 66, which in turn is controlled by the gate control bank 67. This circuit includes a Flip-flop, which at the beginning of each scanning line on one of its output states and at the end of the line in the other state is set. The end of the line is indicated by counting the 5.8 MHz clock pulses certainly; an 84 (1024) bit counter 68 is used for this purpose. The counter 68 ″ is reset at the beginning of each line and supplies an output signal to the control flip-flop at the end of the line 67.

The outputs of a 0 generator 71 and a 1 generator 72 are connected to the data input of the EXCLUSIVE OR gate 62 and deliver the signals 0 and 1 at the beginning and end of each key line. The output of the counter 68 is at the START input of the O generator, the STOP input of this generator is connected to the output of a monostable multivibrator 73. The monostable multivibrator 73 is triggered by the vertical sync pulses and generates an output pulse with a width of 1 ms. The output of the multivibrator 73 is also to the reset input of the counter 68, the START input of the 1-generator 72 and connected to the reset input of a 4-bit counter 74. The 5.8 MHz clock pulses are fed to the clock input of counter 74; the output of this counter is at the STOP input of the 1-generator 72 connected »The output of the counter 74 is also connected to a second input of the gate control flip-flop 67. The vertical sync signal is sent to a control track recording head 76 of the video recorder and recorded in the control track on the tape.

The operation and use of the circuit of Figure 6 are as follows. The data from the plate-making facility is continuously replicated at the 5.1 MHz clock frequency of the plate-making facility entered into the ring memory 61 and with the 5.8-

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ORIGINAL INSPECTED

MHz clock frequency of the video recorder from the ring buffer 61 issued. The end of each scan line is determined by the counter 68, whereupon the passage of data from the ring memory 61 to modulator 62 is interrupted. The keying end signal from the counter 68 switches on the O generator 71, the begins to feed signals 0 to the modulator 62 at the 5.8 MHz clock frequency. The vertical that occurs in the middle of the dead time The synchronous pulse triggers the monostable multivibrator 73, which generates a pulse of 1 ms duration. The back flank of this Impulses stops the O generator 71, starts the 1 generator 72 and resets the counters 68 and 74. Four clock pulses later, the counter 74 overflows, stops the 1-generator 72 and supplies a signal to the gate control flip-flop 67, whereby the timing of the data output for the ring memory 61 for the next touch line is initiated.

The two-phase modulation coding of the data for recording on your tape are best understood from Fig. 7. A carrier signal 81, the frequency of which is the same as the bit frequency of the data 82, is phase modulated according to the level of the data. For data bits with level 0, the phase of the carrier is shifted by 180 °. For data bits with level 1, the changes The phase of the carrier signal 81 is not. According to the example of FIG. So bits 0 and 1 are at level 1, so that the modulated Carrier 83 is in phase with the unmodulated carrier. Bit 2 is at 0 so that the carrier is 180 ° out of phase will. Bit 3 is again at 1, so that the current phase of the modulated carrier is maintained until the next data bit with the level 0. If the data are all at 1, then has the modulated carrier has the same frequency as the non-modulated carrier, while when the data is all at 0, the frequency of the modulated carrier is equal to 1/2 the frequency of the unmodulated carrier.

In the embodiment of FIG. 6, the two-phase modulation takes place through the EXCLUSIVE OR gate 62 and the flip-flop 63. The data from the ring memory 61, the O generator 71 and

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ORIGINAL INSPECTED

the 1-generator 72 are an inverting input of the Gatters fed with the 5.8 MH2 clock frequency. The output signal of the flip-flop 63 is the desired two-phase modulated Signal that is recorded on the tape.

In the circuit of Fig. 8, the tape is played back from the tape Overwritten data is supplied to the input of a demodulator 86 and a read voltage failure detector 87. Of the Demodulator 86 is explained in more detail with reference to FIG. 9; the reading voltage failure detector 87 is from video recorders usual design. The output of the demodulator 86 is to a transition detector 88 and the input of a ring memory 89 connected. The de-modulated data are transmitted with the 5.1 MHz clock frequency output from the ring memory 89 and fed to the printing plate manufacturing device.

The input of the 5.8 MHz clock pulses to the ring memory 8 9 becomes controlled by a device so that the data from the demodulator 89 only during the active part of the touch line can be entered into the ring memory 89. This device contains a connected to the clock input of the ring memory 89 Gate 91 and a gate control flip-flop 92. One input of the flip-flop 92 is connected to a flip-flop 93 connected, which in turn to the output of the reading voltage failure detector 87 and the output of the transition detector 88 is connected. The second input of the gate control flip-flop 92 is connected to an 84 (1024) counter 94 that counts 5.8 MHz clock pulses. The exit of the flip-flop 9j is connected to the reset input of the counter 94.

The operation and use of the circuit of Figure 8 are as follows. The data from the video head of the recorder are fed to the demodulator 86 and the reading voltage failure detector 87. The start of a scanning line is determined by an impulse from the transition file gate 88, which reacts to an impulse "from the span-

9 09 850/0 7 84 ORIGINAL BATHROOM

Power failure detector 87 follows. The output state of the flip-flop 91 changes to the pulse of the transition detector 88, which resets the counter 94 and sets the gate control flip-flop 92 to one of its output states. This will make that Gate 91 turned on, so that the 5.8 MHz clock pulses to the Ring buffer 89 succeeded. The data from the demodulator 86 are then entered into the ring memory 89 until the counter 94 overflows. At this time, the flip-flop 9 2 is set to its other output state, and the clock pulses are locked. The recovered 5.1 MHz clock pulses are continuously applied to the ring memory 89 and the data becomes the Printing plate making equipment supplied at the 5.1 MHz frequency. The ring memory 89 is similar to the ring memory 61. The interval between successive tactile lines from the video recorder prevents the ring memory 89 through the higher input frequency is crowded.

An embodiment of the demodulator 86 is shown in FIG. In this embodiment, the data from the head of the video recorder is fed to the input of a delay stage 96 and to the input of a balanced mixer 97. The delay stage 96 delays by one bit; the output of the delay stage 96 is connected to the second input of the mixer 97. The output of the mixer 97 is connected to the input of a low-pass filter 98, the output of which is connected to the input of a comparator 99. The output signal of the comparator 99 is the demodulated data signal which is fed to the ring memory c9.

In operation, mixer 97 multiplies the delayed and undelayed data signals and provides an output of one polarity when both are in phase. Mixer 97 provides an output of the opposite polarity when the delayed and undelayed signals are out of phase. The low-pass filter 98 removes undesired high-frequency components from the audio signal - mixer 97; tier Kc-; _; ; ra »: ator 93 reads

9 0 il 8 5 0 / ü 7 8 k

Output signals whose logic level corresponds to the polarities of the Mixer output signals.

One of the advantages of two-phase modulation is that that it is a fast recovery of the 5.8 MHz carrier or clock signal from the displayed data. There this signal comes from the data itself, · is the arrangement free of errors due to belt stretching, belt flutter, speed changes and the same. One embodiment of a Circuit for the recovery or synthesis of the 5.8 MHz signal is shown in FIG. The modulated video data from the recording head is fed to the input of a delay stage 101 and an input of an EXCLUSIVE OR gate 102 fed. The output of the delay stage 101 is connected to the second input of the EXCLUSIVE OR gate 102, the output of which is connected to a gate 103. The output of the gate 103 is connected to the input of a monostable Multivibrator 104 connected, the output pulses of which have a width equal to 1/2 the data bit duration. That The output signal of the monostable multivibrator 104 is on the input of a phase locked circuit 106 with a phase detector 107, an amplifier 108 and a voltage controlled oscillator 109 are connected. The output of the phase-locked Circuit 106 is fed back to the second input of gate 103.

Operation and use of the circuit of FIG. 10 will be discussed explained in more detail with reference to the signal curves of FIG. The output of the EXCLUSIVE OR gate 102 is a train of pulses 112, whereby there is a pulse transition in the modulated data. The width of the pulses corresponds to that through the delay stage 101 caused delay. Gate 103 removes any other pulse from the pulse train and generates signals 113 with one pulse for each data bit. The pulses from gate 103 trigger the monostable Multivibrator 104 that generates signal 114. This signal passes through phase locked circuit 106 and delivers

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ORlGiNAL INSPECTED

the recovered 5.1 MHz carrier or clock signal. The recovered The clock signal is fed to the ring memory 89 via the control gate 91.

The demodulator shown in Fig. 12 contains monostable multivibrators 121, 122, to which the modulated data is supplied from the tape will. They are triggered by positive or negative transitions; their periods are equal to 3/4 of the data bit duration. The outputs of the monostable multivibrators 121, 122 are connected to the inputs of a NOR gate 123, whose Output is connected to the input of a monostable multivibrator 124, the period of which is equal to the bit duration. The output of the monostable multivibrator 124 is connected to the data input of the ring pair 89.

Operation and use of the demodulator of FIG. 12 will be discussed explained on the basis of the signal curves in FIG. Signal 129 represents the modulated data from the tape; the signals 131 to 134 the output signals of elements 121 to 124. The multivibrator 121 provides an output pulse with a width equal to 3/4 the bit duration on each positive transition of the data signals; the multivibrator 122 provides one for each negative transition similar impulse. These pulses are fed via the NOR gate 123 to the multivibrator 124, the output pulse width of which is equal to the bit duration, namely with every positive transition in the output signal of the gate 123. The output signal of the multivibrator 124 represents the demodulated data.

Fig. 14 and 15 lines - further execution s forms of recording- and display parts of the arrangement which, compared to the corresponding embodiments of FIGS. 8 in some Use cases are preferred. The various embodiments have certain elements in common that are common to the the same reference numerals are designated.

In the embodiment shown in Fig. 14, the data from the plate making facility at the 1.5 MHz clock frequency the printing plate manufacturing facility in the ring

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ORIGINAL INSPECTED

Memory 61 read. The data is sent with the 5.8 MHz clock frequency of the video recorder is read from the ring memory 61. The data read out from the ring memory 61 are a two-phase modulator which includes an EXCLUSIVE OR gate 62 and a flip-flop 63. From the modulator the data is supplied to a video driver 64 and a recording head 65. The feeding of the 5.8 MHz clock pulses to the ring memory 61 is controlled by the gate 66 and the gate control flip-flop 67. At the start of each key line the flip-flop 67 is set to one of its output states; at the end of the line it is indicated by a counter 68 in the other state is set, which counts the 5.8 MHz clock pulses.

As in the embodiments of FIG. 6, is an O generator 71 connected to the data input of the EXCLUSIVE OR gate 62; it delivers 0 signals at the beginning and end of each Touch line. In this embodiment, however, is the beginning of the scan line is marked by a 64-bit word instead of the four 1's of the embodiment of FIG. Further the dead band or the cross point is detected by a tachometer pulse instead of a reading voltage failure detector for this purpose to be provided. The 64-bit word ensures a more reliable operation than the transition detector in execution Example of Fig. 6, since it is less likely that the 64-bit word is covered by a failure in the tape and glitches are less likely than the coded word can be included. The speedometer pulse also offers a compulsory display of the dead band or cross point.

The tachometer pulse supplied by the tachometer generator 151 becomes the Video recording head fed; the impulse is always given, when the head is in a predetermined position during its rotation, for example at the intersection »

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This pulse is fed to the start input of a counter 152, which is controlled by the 5.8 MHz clock signal. That Output signal of the counter 152 is a comparator 153 to Comparison with an address signal which is an adjustment of the placement of the 64-bit word according to a certain video recorders. The output of the comparator is the reset input of the counter 152 and the Input of a monostable 0.5 ms multivibrator 154 is supplied. The output of this multivibrator is to the STOP input of the O generator 71 and the START input of a 64-bit correlation word generator 156 connected. The output of generator 156 is connected to the data input of the gate 62 connected. The generator also supplies a control signal for the flip-flop 67.

Mode of operation and use of the embodiment of FIG. 14 is generally similar to that of FIG. 6. The data from the printing device is continuously running at the 5.1 MHz frequency the printing plate manufacturing device in the ring storage device 61 entered and output from this with the 5.8 MHz clock frequency of the video recorder. The end of a timeline will be detected by the counter 68, whereupon the data transmission from the ring memory 61 to the modulator is interrupted. The signal from the counter 68, which indicates the end of the scan, switches on the O generator 71, which is connected to the modulator with the 5.8 MKz clock frequency signals 0 supplies. The one during dead time Occurring Tacno pulse is through the counter 152 and the Comparator 153 delayed and fed to the multivibrator 154, which generates a pulse of 0.5 ms duration. The trailing edge of this pulse stops the O generator 71 and starts the Correlation word generator 156 and resets counter 68. The encoded 64-bit word is then used for recording fed to the band to the modulator. Upon completion of this word, the generator 156 provides a signal to the flip-flop 67, whereby the data output of the ring memory 61 for the new touch line is initiated.

909850/0784 ORIGINAL INSPECTED

In the circuit of FIG. 15, when reproducing data overwritten from the tape to the input of the demodulator 8 6 and a correlator 158 supplied. As in the exemplary embodiment 8, the output of the demodulator 86 is connected to the input of the ring memory 89. The demodulated Data is output from the ring memory 89 and at the 5.1 MHz clock frequency of the printing plate making device fed. The feeding of the 5.8 MHz clock pulses to the ring memory 89 is controlled by gate 91, gate control flip-flop 92 and counter 94 so that the data from the demodulator 86 can only be entered into the ring memory 89 during the active part of the touch line. These elements work as well as the corresponding elements of FIG. 8, the control flip-flop and the counter receiving the input signals from Correlator 158 instead of the read voltage failure detector and the Transition detector are fed.

Correlator 158 includes means for comparing each of the 64 bits of the correlation word with the expected level this bit. An analog signal is generated for each bit corresponding to the expected level. Reach the combined If the level of the analog signals is a predetermined level, an output signal is output. This output signal is fed to an input of the gate control flip-flop 92 and the reset input of the counter 94. Suitable for this The embodiment is the 64-bit digital correlator TDC1004J from TRW.

The correlator 158 is by the tachometer generator 151, the Counter 152, the comparator 153 and a monostable multivibrator controlled with a pulse duration of 1 ms. The tachometer generator 151, counter 152 and comparator 153 are in FIG connected in the same way as when recording. The output of the comparator 153 is to the input of the multivibrator 159 connected.

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Operation and use of the circuit of FIG. 15 are as follows. The data from the video head of the recorder is fed to demodulator 86 and correlator 158. The start a tactile line is detected by the delayed pulse from the tacho generator 151, which triggers the multivibrator 159 thus providing a "window" for the correlator 158 of 1 msec duration. After the correlation word has been recorded the correlator 158 has an output which resets the counter 94 and the gate control flip-flop 92 to one of its Sets initial states. This switches on gate 91 and the 5.8 MHz clock pulse is sent to the ring buffer 89. The data from the demodulator 86 is then entered into the ring memory 89 until the counter 94 overflows. To this Time 'will the flip-flop 92 to its other initial state set and the supply of the clock pulses interrupted. The 5, i "MHz clock pulses are sent to the ring memory 89 continuously and the data are fed to the printing plate making device at the frequency of 5.1 MHz. As mentioned, prevents the interval between successive tactile lines from the video recorder that the ring memory 89 with higher speed incoming data becomes overcrowded.

The invention has a number of important features and advantages. It enables a security function in the form of a dense storage of data for printing plates produced by a laser process. The data recorded for a specific page can be accessed quickly and automatically. The data is stored in easy to dsmodulierender form. In addition, the reference timing signal for the printing plate making device can be retrieved from the recorded data.

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L e r s e i t e

Claims (1)

PATΓ V TAN WX LT? SHIP ν. FÜNER STREHL SCHÜ3EL-HOPF EBBIMGHAUS FINCK. MARlAHlLi-PLATZ 2 Bt 3, MÖNCHEN 9O 0 Q 0 0 C 0 * 7 POSTADf (SSSE: HOSTFACH 95 O1 fio, D-800O MOMCHtEN 95 | & ϊ? <Ζ <fc O * f PROPEUSIONAL. FiEPRSSENTATfVHS ALSO ötiFORE THH EUROPEAN PATENT OFFiCS KARL LUDWlO SCHI = F (1384 -197a) DIPL. CH = M. Df ?. ALEXANDER V. FUM = R DTPL. ING. PETE = R 5TR = HL DJPL. CHf = M. DR. UWöÜLA DnHLJBiL-HUPr " DIPL. IMG. DI = TER LT.FJ3INiaH AU ;? DR. ING. DI = TER FiMCK TELEPHONE (Οβ3) -VH 2Ο54. TELEX 5-23 555 AUCiO D TELKGRAMME AUROMARCPAT MUNCH = "! E OCQM CORPORATION June 1, 1979 DEA-14453 Method and arrangement for storing and retrieving data during printing plate manufacture Godparents ta.nsgrüche £ - A method of storing data for a printing plate generated by scanning with a laser beam, the Intensity can be modulated in accordance with the data, characterized in that a data reproducing The signal is fed to a video recorder and the video recorder is operated in such a way that the signal is sent to one connected to it Recording rrtecliuis is recorded. 2. The method according to claim 1, characterized in that that the recording medium overwritten to recover the signal and a photosensitive surface xtfird scanned with a laser beam corresponding to the recovered signal is modulated, so that an image 909850/0784 the data represented by the signal. 3. The method according to claim 1, characterized in that that an addressable index signal is recorded on the recording medium in spatial association with the data signal will. 4. The method according to claim 1, characterized in that that the data is at a first predetermined frequency are continuously entered into a buffer that the data with a second predetermined frequency, which is greater is output from the buffer as the first frequency in runs of a predetermined length, with between there are pauses in successive data runs (touch lines), and that the output data is sent to the helical probe head of the video recorder for recording on a tape at the second frequency, each data run being recorded in one scan of the head. 5. The method according to claim 4, characterized marked h- n e t that the tape will be overwritten or rewritten for the recovery of the data, that the recovered data with the Second frequency is entered into the buffer in runs as it is received from the tape that the recovered Data at the first frequency are output from the buffer and that the recovered data the printing plate recorder at the first frequency for modulation cl-33 write beam and for the formation of a Image of the recovered data. 6. The method according to claim 1, characterized in that that a carrier is specified with a frequency which is equal to the bit frequency of the data that the carrier by phase shifting 180 ° during each data bit 9 C! 9 0 5 0/0784 of a level that the carrier is modulated without phase shift while each data bit of the other level is passed, and that the modulated carrier aixf the recording medium is recorded. 7. The method according to claim 6, characterized in that that the modulated carrier is delayed by one cycle, that the delayed modulated carrier with the undelayed one modulated carrier is multiplied, so that a first signal results when the delayed and the undelayed Carriers are in phase, and a second signal when the delayed and undelayed carriers are out of phase are, and that an output signal of the first logic level is applied to the first signal and an output signal is applied to the second signal of the second logic level is generated. 8. The method according to claim 6, characterized in that a pulse is generated at each transition in the modulated carrier, the frequency of the transitions being equal to the frequency of one bit for each bit of the first level and the frequency of two bits for each bit of the second Level, that one of the two pulses is eliminated for each bit of the second level, and that an output pulse is specified, the width of which is equal to half the bit duration for each remaining pulse, the frequency and phase of the output pulses corresponding to those in the non-modulated carrier, 9. Arrangement for carrying out the method according to claim 1, characterized by a video recorder 23 and means for supplying a signal to the video recorder which reproduces the data, for recording the same on a recording medium connected to the video recorder. 909850/0784 0O. Arrangement according to Claim 9, characterized by means for rewriting the recording medium for recovery of the signal, and by means for modulating the writing beam of the printing plate making device corresponding to the recovered signal. 11. Arrangement according to claim 9, characterized by means for recording an addressable index signal on the recording medium in spatial association to the digital signal. 12. Arrangement according to claim 9, characterized in that that the video recorder consists of a helical scanning video recorder, and that the Data signal fed to the video recording head of the recorder will. 13. Arrangement according to claim 9, characterized by a buffer, by means of permanent Supply of the data to the buffer memory at a first predetermined frequency by means for outputting the Data from the storage device in runs of predetermined length at a second predetermined frequency which is greater is as the first, with pauses between successive data runs, and by means of supplying the output data to the helical scanning head of the video recorder for recording on the tape at the second frequency, wherein each data run is recorded in one scan of the head. 14. The arrangement according to claim 13, characterized in that the video recorder includes means for rewriting the tape for recovery of the data and means for entering the recovered data in the buffer at the second frequency in runs as they are from the tape 909850/0784 and also by means for outputting the recovered data from the intermediate memory at the first frequency, and by means for supplying the recorded data to the printing plate making device at the first frequency to modulate the write beam and to form an image of the recovered Data. 15. Arrangement according to claim 13, characterized in that that the buffer consists of a ring memory. 16. The arrangement according to claim 1, characterized by means for generating a carrier, the frequency of which is equal to the bit frequency of the data, and by a modulation device to shift the phase of the carrier by 180 during each data bit of a level and to pass the carrier without phase shift during each Data bits of the second level, the modulated carrier being sent to the video recorder for recording on the connected to it Recording medium is fed. 17. Arrangement according to claim 16, characterized by means for delaying the modulated carrier by one cycle, by means for multiplication the delayed modulated carrier with the undelayed modulated carrier to generate a first signal, when the delayed and undelayed carriers are in phase, and a second signal when the delayed and undelayed carriers are out of phase and by means for generating an output signal of the first level on the first signal and an output signal of the other Level in the second signal. 18. Arrangement according to claim 16, characterized by means for generating a pulse at each Transition of the modulated carrier, the transitions with 909850/0784 a frequency of one bit per bit of the first level
and of two bits per bit of the second level occur, by means for eliminating one of the two pulses for each bit of the other level, and by means for generating an output pulse whose width is equal to half the bit duration for each of the remaining pulses, where frequency and The phase of the output pulses corresponds to that of the non-modulated carrier. 19. The arrangement according to claim 16, characterized by means for generating a first and second Impulse of predetermined duration with transitions in the modulated carrier of the 'opposite direction, by devices, which respond to the first and second pulse to form a signal corresponding to the logical NOR function of the pulses, and by responsive to the NOR function signal Devices for generating an output pulse, the width of which is equal to the data bit duration, at a transition in the predetermined direction in the NOR function signal. Description ./, 909850/0784 ORIGINAL INSPECTED