DE2105498A1 - Elongated record carrier for color television information - Google Patents

Description

PATENT ADVOCATE

P 21 05 ^ 98.8 8 Monks 71, June 16, 1971

Motorola, Inc.

My reference: M187-P-526

NEW INTRODUCTION - £ U-3 Ιχ Elongated recording medium for color television information

The invention relates to an elongated recording medium, the image brightness and color information.

In the case of the electronic reproduction of images recorded in encrypted form, it is known to include image or display information on magnetic tape, which is later scanned to read out the information and reproduce. It is also known to use photographic film as a direct recording medium and to use black and white or color images on the film are scanned through the grid of a f Braun tube to produce cyclic signals representing the Represent and generate video information. Encrypting the signals to represent color information is of course an advantage over the use of color images because the recording becomes cheaper and more permanent.

The known color signal encryption systems make it difficult to understand the effects of recording errors to a minimum, and to derive relatively stable hue information from the record.

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To obtain complete picture color information, the record must contain color information represented in two signals which are a function of hue and saturation, respectively. However, the multiplex recording method and subsequent decryption for this purpose have often given rise to difficulties with regard to crosstalk between the different sets of picture color information. A further problem in known image recording method was in the tuning of the recording characteristic and the recorded signals, Ao that information accurately with respect to the amplitude and linearity can be derived ness reproduce the images with high naturalness ".

It is an object of the invention to record image color information in a bi-level or digital form, so that the naturalness of the image signals is increased, the cost of recording is decreased and that Recording process is simplified. The hue-r and saturation information should be in a pulse code, which is later deciphered during the scanning process, can be displayed, so that even if it is damaged or weakened Recording can be controlled to achieve an accurate derivation of the signals.

According to the invention, this object is achieved in that the color information is the electrical impulses on the carrier represents, the width of which changes in the time that the

-2- carrier

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Carrier has pairs of recording level boundaries distributed over the image areas of the carrier, and that the pairs of level boundaries represent some kind of color information, while the locations of the recording level boundaries represent a different kind of color information.

The elongate recording medium preferably consists of a photographic film strip, with a series of brightness image areas, or monochromatic image areas, which are assigned to the encrypted color information areas. The image areas for color and brightness are scanned two-dimensionally by an electron beam to generate% video frequency signals. The color information is represented in digital form with recorded pulses, with different color tones being represented by separated sets of recorded pulses.

Further features and advantages of the invention emerge from the following description of exemplary embodiments. Show it:

Figure 1 is a block diagram of a device that provides brightness video signals and derives encrypted color signals from a record carrier according to the invention.

2 shows a representation of a photographic film section, which carries color information recorded according to the invention.

Fig. 3 is a series of amplitude time waveforms showing are derived by scanning a record carrier bearing coloring information and

4 shows a block diagram of a modified part of the encryption device according to FIG.

The device according to Fig.1 (continued on page 6 of the

original description to end of description).

are derived by scanning a recording medium, the ParbinformatiDar ^ em Invention carries; and

Pig. 4- a block diagram of a modified part of the 'rier device according to FIG. 1.

The device according to FIG. 1 derives image brightness information signals which represent, in encrypted form, color information and the accompanying sound, from a record carrier. The brightness, color and tone information signals are fed to a modulator according to the drawing in order to form a multiplex-modulated tri-.gersignal which can be tuned to a channel of a conventional television receiver, with the further possibility of course, the video and audio signals a reproducer with a Braunscher tube and an audio frequency reproducing system to permit an immediate reproduction of the recorded information without the modulation and demodulation taking place in conventional television transmission systems. It is also clear that, according to the following description, the recording medium need not be a fotografie cber.yilm which will be described in detail . It would also be possible to successfully use a recording medium such as magnetic tape or embossing tape so that such a medium would do justice to many aspects of the system.

According to Pig. 1, the film 10 is withdrawn from the supply spool 12 by the drive shaft 14 and placed on the take-up

meapule

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mespule 16 wound up. A motor 18 drives the shaft and the take-up reel 12.

A portion of the photographic film, as shown in FIG. 2, includes luminance images 20 and encrypted color images 22 side by side along the film strip 10. Soundtracks 24 extend on opposite edges of the FiI-rn.es for magnetic recording of stereo sound information or two sets of sound information that alternate are applicable with the pictures. At the center of the film 10 between the image areas 20 and 22 are synchronizing J window 25 provided, ζ. B. in the form of clear windows in an otherwise opaque area of the film so that the image scanning of the image areas is synchronized can be.

It will be seen that the illustration of the film scanning device of FIG. 1 is for the sake of clarity is shown shifted in the longitudinal direction, while in reality the scanning device is arranged laterally should be to scan the adjacent frames 20 and 22 of the film of FIG. The one through the Braun's tube 30 generated raster is projected by an optical image separator 32 so that the same i Raster image is projected through the two images 20 and 22 of the film. Focus the associated lenses 33 ub-cL 34 · the baster images on the light cells 36 and 37 * The light cell 36 generates a signal that generates the video information of the brightness image 20 while the light source 37 generates the electrical signal which changes in the transmittance of the encrypted color image areas 22 corresponds.

One

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Sine Iiichtbime 40 is powered to illuminate light and it to the area through which the synchronization windows 25 (Fig. 2) extend, optically feed to generate a signal in the light cell 36 periodically representing the image sensing information represents. A magnetic pickup head 42 scans the Audio tracks 24 and is coupled to the audio circuit 44, to generate tronic frequency signals as shown in plot 10.

The brightness images 20 are only used as the representation indicated by an arrow. These pictures can be in the form of black and white slides, the subsequent stages in the movement of an object on an iv. the Show cinematography in the usual way. They modulate the light of the grid of the tube 30 to produce a number of to generate horizontal scanning cycles of the video information in the light cell 36 at the video amplifier 48 is translated. This video information can be in a frequency range from 0 to 3 MHz, as is usual on television. The signal is then translated at the RF modulator 50, to modulate a suitable carrier wave to be generated at the output terminals of the modulator. This carrier wave is fed to the tuning circuit of a television receiver.

Part of the output information from the video amplifier 48 also includes perpendicular deflection pulses from the light from bulb 40 passing through synchronization windows 25. Such pulses are coupled to the deflection system 52. The system 52 generates horizontal and vertical deflection

signals

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signals transmitted to the deflection yoke 56 via the line 54 the Braun tube 30 are fed. The system is naturally able to access a new synchronization window 25 to scan a new brightness image 20 (with a frequency of 60 Hz). The scanning can be any Image according to standard television practice with one frequency the horizontal scanning of 15 »73 ^ MHz. The deflection system 52 also generates a dimming pulse * ' during the return over the line 56 »that of the cathode grid circuit the tube 30 is fed to mask the grid on return. It is of course too attached, deflection control signals from deflection circuit 52 ^

to couple with the modulator 50 so that perpendicular and horizontal deflection control pulses can be embodied in the output of the modulator 50.

It is also necessary to control the speed of the motor 18 so that the film is moved past the grid projected by the prism and the lenses 32, 33 »34- synchronously with the vertical scanning in the picture tube 30. Accordingly, a control circuit 60 is coupled to the video amplifier 18 to respond to the signals developed by the synchronization windows 25. The control circuit 60 is coupled to the motor 18, so that the _similar drive for the recording medium is accelerated or slowed comparable f is to ensure in this way that the vertical deflection takes place at the beginning of each image.

It will be appreciated that the system described with the

^ ■ + " exit

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.8th

The BF modulator 50 cooperates to produce a monochrome television signal with sound information, brightness video information and horizontal and vertical deflection control signals. In this case, these signals can be coupled to the output of a receiver to be treated in known manner ter and to generate a black and white image having a suitable hue. An explanation of the recording and deciphering of the color information contained in images 22 now follows.

When modulating the raster image on the face of the tube 30 by the encrypted color images 22 while the raster is mapped onto the light cell 37, the output signal of the light source contains a signal which changes with regard to the clear and opaque stripes or the changes in the recording level of the film images 22. The signal is fed to the amplifier 64 and from there to the clamping circuit 66. As explained below, the amplitude of the color signal can be subject to certain changes over the entire grid due to fluctuations in the light guide of the optical system 32, 3 ^ be. Circuit 66 clamps one set of tips on shaft 27 to a fixed level 68.

The clamped color signal 67 is supplied to the Umrißdetektor (envelope detector) 70, an output signal across resistor 71, developing 72, which varies according to the peak level of the shaft 67, with the outline by the positive peaks of the signal 67 (Fig. 1) shown will. The resistors 71, 72 have the same value, so that one half of the outline amplitude is above

S the

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the resistor 72 is developed and fed to the differential amplifier 75. The output of the clamp circuit 66 is also applied to the other output of the differential amplifier 75 so that the amplifier 75 effectively processes the shaft 67 and one half of the contour amplitude of the shaft 67, which corresponds to restoring the shaft 65 on its central axis. In other words, fluctuate evenly, on average, the amplitude fluctuations of the translated in the differential amplifier 75 signal in the positive and in the negative sense to a recovered axis. the encryption stronger 75 also serves to limit the amplitude or the shaft, which translates it so that the output signal of the serving Amplifier in line 77 is a limited form of wave 65 which has a steady amplitude about the central axis, however, the widths of the pulses of wave 78 correspond to the widths of the various parts of wave 65 ₉ so that they correspond to the widths between changes in the Recording levels in the image areas 22 correspond.

The Pig. 3 shows the exact design of the image area and the intervals between changes in the recording level representing saturation information len.

It is assumed that the image areas 22 of the film sections according to FIG. 2 only a general impression the alternating black and clear stripes on the film. In the details, however can signal 78 at the output of the differential amplifier

21st

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75 of the areas 22 fluctuations geigäS curve A of the Fig. 3 have. The positive peaks of wave 78 according to FIG Fig. 3 depicts the clear areas of image 22 while the negative or lower portions of the wave are opaque Represent areas of the image 22 during a horizontal deflection process. According to the invention is supposed to be the total number of strips, and therefore the total number of pulses across the width of a film / whole Much of the horizontal deflection frequency, e.g. B. the 70th or 80th overtone. According to the invention is a Series of 3 to 5 synchronization pulses 78a, which the Control decryption process, which will be explained below, located on the side of the image area 22 where the grid deflection begins. The changes in the recording level, i.e. H. those changes from clear to clear and from clear to clear on the film used to generate the sync pulses 78a should be scanned during the horizontal down - "^ i ^ lLiiiroyglogs (the signal which is fed to the tube via line 56 of FIG. 1) are generated so that the synchronization history does not appear in the reproduced images.

The signal 78 of FIG. 3 is time division multiplexed 78b, 78c, 78d, 78e, and 78f shown. It is to be understood that each impulse is different Represents color information and that in practice this special sequence does not necessarily have to occur. Such Record probably contains a number of similar pulses that have a particular saturation and one correspond to a certain hue for the area of the image represented thereby. Alternating impulses of the wave

103886/1086

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73 represent so-called H-I or red color differential sigrials Pulses represent the so-called B-T or blue color difference signals. B. h. these signals represent the saturation for red and blue represent how they can be combined with the corresponding brightness information provided by the Image areas 20 is derived to generate hot and blue image signals, which are used in a color television.

Referring to Fig. 3, the pulses correspond to 78b, 73d and TBf R-Y while the pulses 78c and 78e correspond to B-ϊ. the Pulse width is changed to adjust the saturation, the color in- " formation "The pulse 78b" has the smallest width, while the pulse 78 & has the greatest width. The pulse 78f represents a Tennin.pulBwidth that represents a quarter of the width of the next H-I pulse β. The pulses 78a fall where the R-I pulses would normally fall. The B-T pulses, which are usually alternating arranged between the sync pulses 73a are omitted. According to the invention, the gate edges of all pulses are fixed. Only that Trailing edges sway to represent the modulation information. According to a particular embodiment of the invention are the gate edges of the pulses by J

a change in the recording level from opaque to clear as the trailing or modulation information edges of the pulses pass through on the record a change in the recording level from clear to opaque are shown. However, it is possible to reverse this arrangement of the recording display, it is only necessary to pair the distance between recording level edges in the image areas 22

15 / M the

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represents the widths of the pulses of signal 78 as derived on line 77 (FIG. 1). It will also be seen that as the color of the image changes in various perpendicular portions of the image areas 22, the widths of the stripes (ie, the spacing between recording level changes) vary to represent this ciphered information, as do the widths of the recording level changes in FIG horizontal direction across the image areas to show a difference in color information in that direction of the image areas.

With the above explanation of the details of the digital Encrypted information of the image. laugh 22, as it is in derived from a scan within the limits of curve A of FIG. 3, reference can now be made to FIG The rest of the circuitry shown in FIG. 1 can be taken to provide an understanding of the horizontal synchronization of the decryption system and to enable the separate R-Y and B-Y color signals from composite signal 78 to be developed.

The signal 78, which is derived from a horizontal scan of the image area 22, is passed through a line 77 of the differential circuit 80 and the gate circuits 82 and 84- fed. The gates 82, 84 become alternately controlled conductive to only the R-Y pulses in the gate 82 and the B-Y pulses in the Gate 84 translate. The differential circuit 80 develops pulses of the peaks generated by the shaft 86 the curve B in Fig. 3 are shown. These pulses are developed for any change in the recording level. You therefore determine both the front and the

Al too

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also the trailing edges of the pulses of signal 78

The signal 86 is fed to the stabilized multivibrator circuit 90 which may be equipped with tuned circuitry to maintain a relatively steady operating frequency. The circuit responds to positive outgoing pulses on shaft 86, as represented by curve C and shaft 86a in FIG. 3. The signal 86a of course only represents the leading edges of the pulses of the signal 78. If the multivibrator 90 is triggered by the signal 86a, the output signal to the phase splitter μ

ter 92 out, the rectangular waves with opposite Phase supplies »The signal 94- is sent to the gate 82 supplied. The signal 96 is fed to the gate 84. Curves B and E of FIG. 3 represent signals 94 and 96, respectively. The width of the control signals from the multivibrator 90 is such that the signal triggering is approximately the leading edges of the pulses of the signal 78, while the trailing edges have a duration at least equal to the duration of a pulse of the signal 78 with the maximum width.

Thus, gates 82 and 84 are alternately rendered conductive for a period of time sufficient to pass | the EY or. of the BY pulses, while the preceding and following pulses, which are brought in via line 77, are excluded. Therefore, the output of the gate 82 is represented by the signal 98 (curve F of FIG. 3), while the output of the gate. 84 is represented by the signal 99 (curve G according to FIG. 3). The signal 98 corresponds to the RY im-

"1" § Λ 3 pulses

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pulsing the signal 78 »ie the pulses 78a, 78b, 78d and 78f. Signal 99 corresponds to the BT pulses of signal 78, which include pulses 78c and 78e .

The gate 82 is connected to a filter 102. The gate 84 is connected to a filter 104- so that the output signals 98 and «99 are integrated therein in order to generate a video color signal pair which, according to FIGS The widths of the R-T and B-T pulses correspond to and represent the degree of saturation of the hues that these signals produce correspond.

The signal from the filter 102 is fed to the balancing modulator 106, while the signal from the filter 104- the balanced modulator 108 is fed. The modulator 106 is also controlled by a signal from the Oscillator 110 controlled, the frequency of which corresponds to the color subcarrier according to the television standard (approx. 3 »58 MHz) is equivalent to. The signal of the oscillator 110 is phase shifted by approximately 90 ° by the circuit 111 and the modulator 108 supplied. The output signals of the modulators 106 and 108 are fed to the adder circuit 112. They are fed to the RF modulator 50 via the shading modulator 114- in order to be able to communicate with the one in the modulator generated television signal to be connected, and a Form quadrature modulated subcarriers. This subcarrier carries the multiplex information of the two color difference signals, which can be reproduced by a conventional television receiver.

The system according to FIG. 1 also contains a circuit which synchronizes the "unrest-type modulator line-wise.

nized

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nized. This demodulator alternately activates the channels that develop the red and blue signals. To accomplish this, a horizontal retrace pulse 120 from deflection system 52 over line 122 is used as a determination pulse for trigger circuit 124. The output signal of the trigger circuit 124 is coupled via the line 126 to the input signal of the multivibrator circuit 90 in order to cause an interruption in operation during the pulse 120. The next signals used on line 77 as a reset for trigger circuit 124 are sync pulses 78a. Accordingly, the circuit 124 is ready for the next retrace. % The circuit 80 is operated to generate RY signals to the pulses 78a, so that the desired synchronism is ensured at the beginning of each scan line. This prevents the system from being synchronized to BY signals which it might otherwise not be able to distinguish from RX signals.

The circuit of Fig. 4 is a modified form of the deciphering device and offers some operating characteristics, which in some cases may be desirable. According to the invention, the color signals correspond to which are fed to the system of FIG. 4 via the line 77, those of the signal 78 with an off ™ would take. This exception is that during the initial sync pulses that are at the beginning Every horizontal deflection cycle is generated, the duration of these signals is increased so that they one Have a 50% duty cycle. In this way, the recording is made on the side of the image areas 22

^ 9 A ^ changed

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changed so that the pulses 78a take the shape of the wave 94 according to FIG. 3. The synchronization pulses were thereby on half the time and off half the time.

The circuit of FIG. 4 develops the gate switching signal in a different manner according to the invention in order to ensure that the gates only translate the properly assigned color signals «The system according to Fig. 4- also works according to a signal encryption method, in which the absence of some impulses (as a result of e.g. scratching or other damage the image area 22) leads to an image that is less noticeably damaged than with the circuit according to FIG.

According to Fig. 4, the input line 77 translates the pulse modulation signal 78 to the differentiating circuit 120. The circuit 120 supplies the blocking oscillator or multivibrator 122 with the pulses of the signal 86a (Fig. 3)> to control this oscillator according to the void edges of the pulses that the changes in the recording level from opaque to clear appear in the image area 22, of course. The differentiating circuit 120 also provides pulses to the gate circuit 124, 126. These pulses coincide with the leading edges of the signal 78 pulses. These are the negative going impulses of the wave 86, the z. B. pulses 86b-86f

The oscillator circuit 122 has an output which connected to the trigger and phase splitter circuit 13Ο is used to provide output shafts 94 and 96 which are phase

T8 / \ {> moderate

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are moderately opposite and have leading edges that correspond to the leading edges of the signals in shaft 78. The rear edges include the maximum pulse width modulation that can be found in the signal 7 & . The signals 94 and 96 are coupled to the gate circuits 124 and 126, respectively, so that these gates are alternately rendered conductive in order to allow the introduced pulses from the differentiating circuit 120 to pass. Since the gate 124- is controlled by the signal 94 according to the contemporary assembly of the pulses of RY-Ihformation ₉ is the output of the gate 124 in the form of pulses 86b, 86d, 86f, etc. By% a corresponding mode, the output of gate 126 comprises the pulses 86c, 86e etc.

The output of gate 124 is connected to the hias gap circuit 132 coupled, the opposite in phase Signals are fed to the terminal blocks 134 designed as gates. Like me the bias splitting circuit 136 couples the output signal of the gate 126 with the clamping circuit 138 designed as a gate for the pulses which contain the B-Y information represent.

The signals from the trigger circuits 130 are sent to the " two approaches to integration were introduced. It will Signal 94 of the integrating circuits 140 fed. That Signal 96 is fed to integral circuit 14-2. The output signal of the integrator 140 is a symmetrical sawtooth signal 144, which is sent to the formed as a gate Clamping circuit 134 is brought up. The output signal of the integration circuit 142 is a phase

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moderately shifted sawtooth signal 146, which is sent to the as Gate formed clamping circuit 138 is brought up.

It can be seen that the gated clamping circuits 134, 138 respond to the symmetrical sawtooth signals. These signals also carry the pulses fed through the phase splitter circuits 132 and 136. Therefore, the output of each gate clamp circuit is a voltage proportional to the level of the sawtooth signal applied at the moment when the pulses 86 occur during the sawtooth signal. As a result, a signal is effectively generated which is proportional to the time interval between the beginning, each sawtooth part of the wave and the occurrence of the pulses 86. This signal naturally represents the pulse width with the output of the gated clamping circuit 134 s cLie the RY information of the pulses 78t> »78d and 78f is, while the output signal of the designed as a gate clamp circuit 138, the widths of the pulses 78c and 78e, what represents bY information representing" the formed as a gate clamping circuits 134, 138 are connected to the filter 148 and 150 which produce video color information which is in the form of gradually changing signals as opposed to stepped signals. Such stepped signals are generated by the clamping circuits designed as gates _{or the like}

The mode of operation of the circuit of FIG. 4 offers advantages in cases in which the image areas 22 of the recording medium damaged or there is a risk of electrical noise in the color deciphering process.

10 9 8 8 6 /! 086

ten is. Otherwise could scratches or dirt on? Ilm in Dechiffrierungesyetem translated as pulses "what could prove to be detrimental to the system calibration. The circuit according to FIG. 4 is to be understood as a balanced time discriminator which has such characteristics that if there is no signal output, ie if the signal 86 is absent, no signal output is supplied by the filters 146 and 150. There is the further advantage that if there are no pulses of the signal 86, the output of the KIe circuit β η 154 and I3Ö remain at the previous signal level instead of changing over to another voltage level, which would probably lead to incorrect color information « T) ea Furthermore, the system is Balanced so, when da3 colorless operation associated with white entsprich ^ dus Auegangssignal the two color difference channels the value is zero an operation, because the sawtooth signals are AC coupled with the designed as gate circuits. There is also no component of 1 MHz in the output signal to be filtered, which is the case with the circuit of FIG.

In the system of Fig. 4 of the decryption process at the beginning of each horizontal deflection cycle of the image areas 22 on record carrier 10 on eyn- modified Veise ä

chronized. The phase position of the blocking oscillator or Hultivibratora 122 becomes horizontal at the beginning of each Deflection line set in such a way that reversal is possible if the system should display the R-T pulses as'

BT-READ-pulses To realize this, the synchronization pulses are propagated 73 & such that they have 50% duty cycle, although their aie

13 normal

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maintain normal phase position. The effect of the modified Pulse 78a appears like that of signal 94 of FIG. 3. Three to five cycles in this form of the signal are recorded at the beginning of each horizontal deflection surface on the recording medium 22, which is via the line 77 (FIG. 4) go to the in-line circuit 160. A few cycles of the synchronization pulses will result in a ringing signal 162, since the circuit 160 is on the Frequency of the pulses 78a, which are set for a 50% duty cycle, is tuned. The sine wave 162 is via the RC network 164 with the input of the trigger circuit 166 coupled. The input of the trigger circuit 166 is also via a resistor 170 with a source negative DC voltage coupled. The input signal of the trigger circuit 66 is still via the insulating resistor 172 coupled to the output of the differentiating circuit 122. Accordingly is the resulting input signal represented by curve 174 on trigger circuit 166. The sine wave 162 fluctuates around the negative Ε potential during the pulses of the wave 86 the sine wave are added.

A horizontal return pulse 176 sets the trigger circuit 166 fixes the circuit I30 in a state holds to turn on gate 126 and turn off gate 128. Hence the system is ready to receive B-T signals to direct. After the return but still during the dimming, the amplitude of the ringing signal 162 increases after two or three sync pulses 78a (as modified) and the amplitude of the resultant of the pulses 86 and the sine wave exceeds a voltage level, e.g. B. 0, which triggers the trigger circuit 166.

22. 70 After

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Compartment, the development of a signal 174 is made accordingly the trigger circuit 166 is activated in order to "in The trigger signal to the circuit 130, which then on the remaining synchronization pulse ·? 8a der E-T-Hiase responds. As a result, several synchronization pulses in signal 174 are needed before the system begins in the H-T phase is the line synch.ronieztus of the system more reliable.

Looking at Pig. 1 is the correction of shading a explained errors which can be traced back to the fact that the optical system? 2, 33 and 3 "NL ^ telteile Jj

of the basters of the drill 30 lighter on the L ' and 37 can map than the band parts of the grid shown.

Pa the two demultiplexed by the decryption process Signals represent color difference signals, e.g. The R-T and B-T signals, is a brightness inventory by these signals are shown. These signals are of course in the television reproduction process with the T- or brightness signals generated from the image areas 20 of the film 10, so that the image display device is driven by red or blue signals 14.

When deciphering the color information of the image areas 22, however, the operation of the outline detector 70 does not Aaplitude fluctuations of the signal 67 as originally derived from bo that there is no shading error in the signal. (Rather, they are cycles or iBp-ale "in the signal 67 as in the axis - like derherg" - files and limited signal 73 shown to the all

2 $ Z4 gradual

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it

Gradual. Shading that comes across a line deflection corridor can take place.)

It is accordingly possible to use the output of the outline detector 70 developed across resistor 72 and supply it to shading modulator 114 such that "shading" of the color difference signals, which are fed to the modulator 50 caused so that they correspond to the already shaded brightness signals going into the video amplifier 43 can be generated. On the other hand, to lie shading To exclude rolling, it may be preferable to omit the shading modulator 114 and the output signal on lead 180 of outline detector 70 to use the grid-cathode circuit of a drill 30 to control and the brightness in bright optical To reduce the areas of the hasters and optically video amplitude fluctuations occurring in the brightness signal off so that the signal corresponds to the color difference signals from the color deciphering circuit are matched. These signals do not contain the optically caused shading errors.

The signal recording and deciphering system described above uses simple digitally recorded ones Information in the form of record level pairs without any special intermediate recording level are necessary. PiObIeMe of linearity are omitted and the detection of such intermediate levels ensure a natural signal reproduction. The recording level change pairs that make up the cipher system form, ensure both color decoding and synchro-

IL nlsatlon

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nization with horizontal deflections as well as for an alternating control of the Kultiplexdeciphering process, whereby two color signals are derived alternately. Sas system can handle damaged recording media use, such as B. dirty FiIm or film with partially destroyed strips because the Maintain synchronization of the decryption circuit despite the loss of information from the color image areas will.

The system can be successfully constructed for video frequency response in excess of 500 KHz by using for the pulses the signal 78 a frequency of about 1.1 1.2 MHz is used, which corresponds to the product of 70 or 80 times the horizontal deflection frequency. This gives half the number of "bits" of color information per Color in a specific deflection line. The system is therefore compatible with current television receivers that generally a video ο color information of the order of magnitude of 500 KHz in bandwidth.

As is apparent from the above, the invention provides a color signal recording apparatus in which recorded Pulses have widths and positions that represent color saturation and hue. For example, pulses recorded with different widths so that alternate pulses represent one hue and the other Hue is represented by interposed pulses. The system can be combined with a flying point deflection system realize that works with a brightness image representation and the color signal information, to generate complete image signals. The invention

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provides circuit measures to remedy the error "in the Deriving the signals to keep the recording to a minimum. The record can be in the form of z. B. have photographic film. The invention also allows the error in the "synchronization of the deflection process." to reduce. The reproduction of the image signals can be based on television techniques known per se take place·

Claims

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Claims (2)

2105493 Patentann »r Ü ο h l.y Elongated display carrier, the image brightness «- and Represents color information, characterized in that the color information is the elec- trisehen! «pulse derateilt, the width of which can be seen in the tent ™ changes that the carrier has pairs of exposure level boundaries (22) that span the carrier's image area are distributed, and that the (rrensenpaare a kind of Color information represent «while the positions of the exposure level limits a different kind of variation represent· 2. Recognition carrier according to claim 1, because it knows that the first image of each pair looks immovable in the picture area »Awaken synchronization, while the global expansion agrenia of each couple has such a position within | The recording organization assumes that all color saturation information is displayed. 3 · Aufseionungträger according to claim 1 or 2, characterized gekennseicb.net that odd pairs of the Recording level limits represent the Li-Y color information, while even pairs of the recording level limits represent the B-Y color information. 109886/10 8 8 M107P / G-526/7 2105493 4 * On »calibration carrier geaMaa claim 3, thereby g · - knows ·· denies that the «in · side · of each picture surface consists of a group of exposure level limit pairs, where only bit beaug on dia Γί-γ-color information beetiaet let · -Ή - 109886/1086 Blank page