DE1537422C - Circuit arrangement for determining the phase of clock signals in a color television receiver with a beam index tubes excretion from 1293828 - Google Patents

Description

1 2

The invention relates to a circuit arrangement generated beam for the reproduction of the color green

to determine the phase of clock signals in a,

Color television receiver with a beam index tube. FIG. 5 a shows the modulation of the cathode ray stream in color television receivers with a ray index meter for the reproduction of the color blue,
tube produced by painting index strips 5 F i g. 5 b the index signal that is generated by the cathode clock signals are unsatisfactory due to their beam current for the reproduction of the color blue er

in phase and intensity. For example, with FIGS. 6 shows an enlarged illustration in section

color changes to be reflected the phase of that of a part of the screen of the cathode ray tube,

Intensity of the cathode ray modulating Si- ίο which is to the left of the in F i g. 1 shown part of

gnals changed. This affects the phase of the screen and the cathode ray

Generated index signal in the known Einrich- at the beginning of each line is scanned before scanning

services. As a result, the derived index signal of the in FIG. 1 part of the screen shown,

not exactly the position of the cathode ray identifies- F i g. 7 is a diagram showing the index

nen. This in turn affects the reproduced signal, which is emitted by the cathode ray when it is impaired.

Color, so that the color rendering differs from that of the original flow of the part of the screen shown in FIG.

nals can differ. mes is generated,

By Australian patent 233 549 it is Fig. 8 in block form a color television system, already known known, two groups of index strips ches the index generator according to the different one Distance to be provided and used by 2 ° finding.

Mixture of the two interfering In the different figures denote the same

dexsignale the interference largely to compensate- reference numerals the same parts.

sate. The influence of changes in the elec- The screen 14 of a cathode ray tube 12

electron beam generated in phase and intensity has an outer surface 16 and an inner

Phase disturbances of the index signals can, however, be 25 surface 18. The inner surface 18 of the screen

cannot be fully balanced. 14 of the cathode ray tube 12 carries several parallel

The aim of the invention is to generate clock signals that are arranged horizontally next to one another and vertically

to improve and clock signals with fixed phase stripe segments 20, 22, 24 (FIG. 1). the

To generate senlage, which by intensity changes- strip segments 20, 22 and 24 are always the same

ments of the electron beam as a result of changes 30 sequence arranged side by side, and each such

the color to be reproduced cannot be affected. The sequence of segments 20, 22 and 24 forms a three-way

This object is achieved by the invention in a circuit group 26, several of which are arranged next to one another.

arrangement for determining the phase of clock signals are seen.

Len in a color television receiver with a beam, ^ each of the segments 20, 22 and 24 generates a light index tube in that a first frequency multiplier signal, when hit by a cathode ray, is multiplied by two frequencies lying in series. The segment 20 can, for. B. from a phosphor multiplying circles with a temporary one of which generates red light, while the run-up strip generated phase-determining signal segment 22 from a phosphor, the green light leading input is connected and a mixing circuit, and the segment 24 from a phosphor both with the second frequency multiplication 4 °, which generates blue light. The segments circle as well as an index 20, 22 and 24 generated by index strips are distributed over the screen 14, lines carrying dex signals are connected and with that a cathode ray, which horizontally sweeps the screen 14 of its output signals at the first frequency multiplier, in each Line 300 to 500 or more subject circle controls, at the output of which an on the. . Groups of three 26 touched. The phosphor stripes Kgs continuous phase clear signals of the desired frequency 45 n ^s is connected in a conventional manner using known frequency-carrying line. Be upset by the techniques. It is also possible for all the circuit arrangement according to the invention, the segments 20, 22 and 24 to be made of the same material, the phase position of the ambiguous index signals, which generates white light, and follow an unambiguous start-up signal, to which a filter material can then be in the form of stripes unambiguous clock signal with little disturbance can be used during the 50, which always reshapes only selected colors rend the color control. , let through. '

One embodiment of the invention is in which an aluminum layer 28 is over the segments

Drawing shown. It shows , . 20, 22 and 24 attached. The common today in

Fig. 1 is an enlarged view in section through television tubes used for aluminum layer part of the screen of a cathode ray tube 55 is permeable to electrons, but not to light rays of the invention, len. The aluminum layer 28 therefore deteriorates

F i g. 2 a diagram to illustrate the not penetration of the electrons to the seg-

Index signal generated by a constant sampling of the groups of three 26, while that of the

beam is generated, segments generated light from the aluminum layer

F i g. 3 a is a diagram showing the modulus 60 being reflected to the outer surface 16. the

lation of the beam current for the reproduction of the aluminum layer 28 serves to pass through the screen

Color red, 14 to transmit light to the outside, which

F i g. 3 b a diagram for reproducing the inside was generated within the cathode ray tube. the

dex signals, which is caused by the cathode ray for the aluminum layer 28, thanks to its conductive

Reproduction of the color red is produced, 65 ability to equalize the potentials along the

F i g. 4 a the modulation of the cathode ray for the inner surface 18 of the screen 14.

rendering the color green, several index elements 30 are on the inner

F i g. 4 b the index signal, which is arranged by the cathode surface of the aluminum layer 28. the

3 4

Index elements 30 are evenly distributed, vertically the in FIG. 4 a shown course of the cathode course end Stripes, which are horizontally spaced from the beam, which is responsible for the reproduction of the color green from each other on the surface of the aluminum is necessary, showing peaks 44 of the current only when layer 28 lie. In this regard, the green phosphor segments 22 are to be painted over. the vertical index strip elements 30 are arranged in a similar manner 5 resulting largest peaks 46 of the generated In how segments 20, 22 and 24 of the dexsignals are shown in FIG. 4 b reproduced. None Three color groups 26 of the index elements 30 are congruent with green ones

The index elements 30 can consist of phosphorus phosphor segments 22. An index element 30 occurs in

short persistence or one of the first group of three 26 later, while the

Material whose secondary emission occurs earlier than the other in the second group of three 26

Secondary emission of the aluminum layer 28 falls. Hence the peaks 46 of the main index

part. signal with respect to the tips 44 of the cathode

The colored groups of three 26 of the segments 20, the jet stream in the direction away from each other

22 and 24 are in equal proportions along the length compared to comparable tips 32, which by the

distributed in a horizontal line. The index segment 15 also generates constant cathode ray current of FIG

ments are shifted in a certain constant becoming.

ratio distributed along the line. The relationship of the smallest peaks 48, which by the slight-

Distribution of the segment groups 26 and the distributed values of the cathode ray current are generated

Development of the index elements 30 along the line is for the, lie in correspondence with the tips 32,

Extent of disturbance of concern caused by the in FIG. 2 are shown. As a result of the sym-

for the production of different colors necessary displacement of the tips 46 of FIG. 4 b

^ dige intensity changes and phase changes produce the tips 46 and 48 a signal, the one

\ _ / rungs of the scanning beam caused fundamental oscillation, which in the dotted

be able. Lines 50 is shown. The signal 50 has the fre-

If, as in known devices of the sequence and phase of the index signal 32 of FIG. 2. of the art, an index element 30 for each triple The largest peaks 52 of the modulation of the catho group 26 or an index element 30 for each segden beam stream for generating the color reproduction ment 20, 22, 24 of the groups 26 is provided, then blue will enter into correspondence with the blue If a considerable disturbance occurs in the index signals phosphor segments 24. The largest index signal on. 30 tips 54 are symmetrically shifted from one another

F i g. FIG. 2 shows the index signal generated by a relative to the index signal peak 32 generated by a

Cathode ray constant current is generated, the constant cathode ray current, as in FIG. 2 ge

is moved along the horizontal line and shows is generated. Several smallest peaks 56 are

the segments 20, 22, 24 and the index elements generated with each other, which correspond to the signal peaks 32 of FIG

Elements 30 arranged along this line are shown in FIG. 2 match. The symmetrical publishing

stimulates. When the cathode ray from left to right tion the largest peaks 54 and the smaller peaks

along the horizontal line with a constant 56 produce a signal that is one by the dotted

Speed is moved, then signal line 58 contains indicated basic components,

peaks 32 generated one after the other as soon as the beam This basic component has a frequency and a

encounters an index element 30. The tips 32 are 40 phase, which is identical to that of the output index

in the illustration of FIG. 2 among the index element signal generated by the constant cathode ray

th 30 and correspond in their position to the excitation measure F i g. 2 is generated.

of the element concerned 30. The speed From the consideration of the diagrams F i g. 2 to

\ j of the cathode ray in the horizontal direction 5b can be seen that regardless of the special

all changes in the

kept practically constant. Amplitude and phase of the signal that the

The F i g. 3 a shows the amplitude changes of the cathode ray modulated, generating an index signal, Cathode ray depending on the time for its basic component a frequency and phase the generation of rendering of a red color. has that practically independent of these changes-Die Peaks of the cathode ray current occur in 50 ments. The ones at the largest peaks of the index one Time on which the excitation of the red phos balance signal evoked changes hephorsegmente 20 of the groups of three 26 causes. As a result of their symmetrical dislocation, they arise The current intensity of the cathode ray reached in the so that the basic component of the resulting in areas 36, in which it is lowest, preferred dex signal in constant relation to the transfer not the value zero. 55 stroke the cathode ray over the line and

According to the diagram of FIG. 3 b are the largest of their respective positions in relation to the group of three

Index signal peaks 38 generated when the tip 34 of the pen 26 remains.

Cathode ray current with a peak 32 of the index- The frequency of the generated index signal that passes through

signals coincide. The generated outputs which the cathode ray is excited deviates from the fre-

the largest peaks 38 and the small peaks 40, the 60 sequence of the frequency of the groups of three 26 from. for

in the region 36 of the cathode ray current generates two groups of three 26 or for six each

will cause an output signal with a phosphor strip segments 20, 22, 24, which through the

Basic components to be excited by the dotted line 42 cathode ray become five

is indicated. The fundamental 42 has produced a Fre peak 32 in the index signal. The frequency

frequency and a phase which is identical to the frequency of the generated index signal can, however, be

frequency and phase of the index output signal that suitable devices are converted to a

in Fig. 2 for the constant cathode ray current to the desired relationship to the speed

is shown. with which the cathode ray of the group of three

5 6

pen 26 is brushed over. For example, it would be special to the various segments 20, 22, 24 of the

expedient to identify the frequency of the generated index signal groups of three,

directly with the frequency of the frequency of the three-way through one in F i g. 8 system shown can

groups 26 to match, so that each of the unambiguous, phase-determining index signal

Peak of the converted index signal indicates, 5 and the ambiguous index signal for the generation

that the cathode ray has a triple 26 of a continuous, unambiguous index signal

deletes. used with the frequency of the triplets

Without special facilities the starting point has to be.

signal has an ambiguous phase relationship to the The color television system 64 shown in FIG.

Groups of three 26. io holds a cathode ray tube 12 with a picture

One of the tips 32 coincides with the red phosphor screen 14, the one with groups of three and with index strips 20 together, while another tip is equipped with elements 30 and one part of which is the between the green and blue phosphor index elements 60 carries. The dotted lines 1 of the Segments 22 and 24; a third tip 32 is shown in FIG. 8, which is shown enlarged in FIG generated when the cathode ray partially on the 15 part of the screen 14 while the dotted The blue lines 6 in FIG. 8 and partially on the red phosphor stripe show that in FIG. 6 enlarged and 20 lies. As a result, the tips 32 can indicate a posed part 14 'of the screen. the Do not use the generated index signal solely for this purpose. Cathode 68 of tube 12 generates a cathode end be to the location of the cathode ray in ray. A control element 70 receives a signal via With respect to the segments 20, 22, 24 of the group of three 20 a line 72 for changing the intensity of the pen 26. Cathode ray. Beam deflection means, namely

To remove the ambiguity, the magnetic coils for horizontal deflection and

Special means related to the magnetic coils for vertical deflection can be carried out by

F i g. 6 and 7 will be described. The in F i g. 6 signals that are supplied via connections 74 and 76

showed horizontal section through part 14 'of 25 to be excited. The electron beam can

The screen 14 of the cathode ray tube 12 is caused to move from left to right with a left

the screen part 14 (Fig. 1) arranged. When moving of practically constant speed,

Cathode ray moves one line from left to right while moving extremely quickly over the line to the

then he first touches the beginning of the screen at the beginning of the next horizontal line

14 'before the part of the line that is moved back on the screen 30, which in turn is from left to

part 14 lies, coated. · Is swept over on the right. The vertical deflection

The inner surface of the screen portion 14 'needs signal can cause the beam to slowly move off

Not being equipped with groups of three 26 has swept across the screen at the top, while

yet the aluminum layer 28. The inner upper- it is quickly returned from the bottom to the top,

surface of the aluminum layer 28 bears more than 35. In this way, a series of practically horizontal

parallel, horizontal offset vertical scanning lines are generated, which are offset in parallel

cal strips formed index elements 60. The in-run and which against each other in the vertical

dex elements 60 can be offset in the direction already described. The electron beam begins

Can be manufactured in a manner that is

that is identical to that of the index zontal direction transverse to the vertical segments

elements 30; however, the index elements 60 are in that of the groups of three 26 and the vertical strip conveying

horizontal direction along the line in a merging index elements 30 and 60. At the beginning of each

proportional to which of the number of group of three lines the electron beam touches the phase-determining

pen 26 along a line, divided by a whole menden index element 60, and after further movement

Number, corresponds to. In this way, a signal that moves along the line touches the segments of the

ches by brushing the elements 60 by groups of three 26 and the index elements 30. The

of the cathode ray is generated, a frequency, screen part 14 ', which the phase-determining stray

which is the same or represents a subharmonic of the fen-shaped index elements 60 is preferred

Ratio with which the cathode ray is wise to the edge zone at the extreme left

Groups of three 26 coated. 50 end of the screen 14 limited. This area is

In the embodiment shown, the In- are narrow enough so as not to significantly reduce the size of the dex elements 60 arranged in a distribution to soften the screen of the cathode ray tube 12 0.5 the frequency of groups of three 60 longitudinally pregnant, while on the other hand it is also sufficient corresponds to the line. broad is to a number of phase determiners

In the example it is assumed that the cathode will generate 55 pulses, the purpose of which has already been explained

beam was moved in the left-to-right direction.

will. The direction can also be reversed, in each case the index strips are but then the screen part 14 'on the right in front of the 30 and 60 would have to be made of a phosphor of short resistance Be arranged at the beginning of the screen 14. When made, which when the electron beam path hits A light signal is generated 60 les via the index elements 60 of a line. The same system could First a phase-determining signal is generated, but it can also be used when index elements It is in the form of tips 62 (Fig. 7. Figures 30 and 60 are formed from a material which Phase-determining index elements 60 are so divided into a secondary emission for generating the index, that it supplies 30 signals together with some index elements.

fall; these are denoted by 60 '. The at 65 A photoelectric cell 78 is outside the

Brushing the index elements 60, 60 'arranged derived cathode ray tube 12; she is going through

The phase-determining signal can be used to excite light, which from the index elements 30 and

the, the relative position of the cathode ray in relation 60 is generated as soon as it is from the cathode

7 8

beam to be hit. That of the photoelectric frequency, which of the frequency mixer 92 look up Signals generated by cell 78 are taken via a. Since the input line 91 of the Fre gate 80 is fed to an amplifier 82. The mixer is not aroused at this moment, stronger 82 is tuned to a frequency which is not output from mixer 92 is as great as the frequency of the frequency of the 5 testifies.

Triplets. This so-called group of three As soon as the cathode ray hits index elements 30 during the sweeping frequency is determined by the number of group of three of the line, an emanation is generated by the cathode ray during its output signal with a frequency that corresponds to the sweeping of the line in the unit of time has more than 2.5 times the value of the triple frequency. Become thieves. From the amplifier 82 the signal io this signal is fed to the amplifier 88 after being tapped by the photoeinem frequency doubler circuit 84 of a network 86 electrical cell 78. The frequency doubler 84 supplies an output which now sends an output signal to the limiter output signal with the triple frequency to a 90. The signal, which is given by the limiter 90 from the output line 100 , is detected by the detector circuit 94

The output signals of the photoelectric cell 15 are taken, which sends a reset signal to the flip

78 are also fed to an amplifier 88, flop 96 supplies. The flip-flop 96 prevents its

which is tuned to a frequency, the 272inal reset position allows index signals to pass through

is as great as the frequency of three groups. The gate 80 to the amplifier 82.

The output of the amplifier 88 is fed to a limiter. The output signal at 2.5 times the frequency of the

circle SO to an automatic amplitude control 20 triple frequency is on line 91 the

fed. The output of the limiter 90 is fed to a mixing circuit 92. The recording of the signals

on the other hand via a line 91 with a frequency mixing of the two input lines 91 and 104 made possible

circuit 92 of the network 86, on the other hand also with it the mixing circuit 92, an output signal of a frequency

connected to a detector 94, which generates a reset frequency that is the difference between the two frequencies

signal for a multistable flip-flop circuit 96 corresponds to lines 91 and 104 ,

ready. The limiter 90 holds its output signal. The output signal has a frequency of 0.5 times

proportionally independent of changes in the value of the triplet frequency. This signal

Cathode current. is connected to the frequency doubler via line 106

The multi-stable flip-flop 96 supplies in its management circuit 84 supplied.

Reset state a signal to the gate 80, which 30 The frequency doubler 84, which has previously been excited by some clear signals from the passage of signals to the amplifier, which is prevented by the amplifier 82; If the flip-flop circuit 96 is derived by a core 82, the input signal to a terminal 98 is excited by signals, which is set by the frequency control state via the line 106 , then it supplies a signal, mixing circuit 92 are received. The signals received via the transfer device enabling gate 80 to pass index signals through 106 allow the same. Frequency and phase like the signals that were originally

A second frequency doubling circuit 102 borrowed from amplifier 82 can be derived. Therefore, network 86 is maintained by output signals on the line 100, the output signal of the doubler 84, the phase-determining index signals generated by the frequency doubling phase at which they come previously through the start-up circuit 84, and provides output signals 40 strip generated phase-determining index signals with twice the value the triplet frequency was marked.

Via a line 104 to the frequency mixing From the above it can be seen that at the beginning circuit 92. The frequency mixing circuit 92 supplies when signals are used which clearly receive input signals via the lines the phase of the index signal to the group of three 91 and 104 with an output signal determine the 0.5 times 45 frequency, the ambiguous index signals, value of the triple frequency via line 106, which are later derived at 2.5 times the triple frequency to the frequency doubling circuit 84, can be used,

Terminal 98 receives a synchronization pulse in order to continue to supply output line 100 with the unambiguous at the beginning of each horizontal line of the cathode signal with a frequency of three groups. It's ray. This synchronization pulse causes 50, however, to determine that the index signals which are derived from the flip-flop 96 to send a signal to the gate 80 to the index elements 30 do not give. The first index signals, which may be interrupted by the phase, since these index elements 60 which determine the generation are generated, could result in an output signal on the line 100 having a frequency of 0.5 times the value of the three, which is not the Phase designation group frequency. Although this signal is owned by the Ein 55, which was originally set,
output of the amplifier 88 is applied, this provides a synchronization pulse which, at the amplifier, has an output signal, since it occurs at the end of each line at the terminal 98, which is 2.5 times the value of the group of three - the flip-flop circuit provides the flip-flop circuit 96 a so that it's frequency matched. These index signals are enabled by gate 80, however, also to allow phase-determining index signals to pass through the amplifier 82 60 to the amplifier 82 via the gate 80. These signals fed to the frequency of the incoming ones are blocked immediately as soon as the initial signal is matched and the signal for the fre- quency activity is completed. Shortly after index signals, the frequency doubling circuit 84 of the network 86 passes on a frequency 2.5 times the value of the group of three. The Doppler 84 provides an output signal of the pen frequency to be recorded, which is the over-triplet frequency. This output signal excites the transmission of energy to the phase network 86 without the second frequency doubling circuit 102. The interruption up to the end of one of its line frequency doubling circuit 102 provides a secure output, signals of the double value of the triple amplifier 82 are prevented by means of gate 80 which no further radio

tion, but could conflict with the activities of the network.

The triple frequency output signal that appears on output line 100 from the network is delivered, as it is clearly related to the respective position of the cathode ray along the line related can be used for various purposes. For example, the signal on the Line 100 control the horizontal scanning speed along the line or a video signal to the Control electrode 70 of cathode ray tube 12 conduct. The signal on line 100 can be used for control of the three separate color signals are used, one after the other, in the desired order to create. The signal on line 100 can also mix with the incoming one Color carriers can be used. This use is described in detail below.

Claims (9)

Patent claims: 1. Circuit arrangement for determining the phase of clock signals in a color television receiver with a beam index tube, thereby characterized in that a first frequency multiplication circuit (84) is two in series Frequency multiplier circuits with a temporary one generated by inrun streaks phase-determining signal leading input (78) is connected and a mixing circuit (92) both with the output of the second frequency multiplication circuit (102) as well as one of index strips generated index signals leading line (91) is connected and to its output signal the first frequency multiplication circuit (84) feeds, at the output of which is a continuous phase unambiguous signals of the desired frequency leading line (100) is connected. 2. Circuit arrangement according to claim 1, characterized in that the frequency multiplication circuit (84) is arranged so that it picks up phase-determining signals of a certain frequency and that the mixing circuit (92) is arranged so that it receives drive signals of a higher frequency than the frequency of the phase-determining Picks up clock signals. 3. Circuit arrangement according to claim 2, characterized in that the mixing circuit (92) Drive signals at a frequency of an integer multiple of the frequency of the phase-determining Receives signals. 4. Circuit arrangement according to claim 1, characterized in that the mixing circuit (92) the driver signals are fed in after the phase-determining signals have occurred, so that it supplies an output signal in the phase position of the phase-determining signals. 5. Circuit arrangement according to claim 4, characterized in that with the input (78), which successively leads phase-determining signals and drive signals, two selective devices (82, 88) are connected, of which one device (82) on the frequency of the phase-determining Signals is tuned and these supplies to the frequency multiplication circuit (84, 102), while the other selective device (88) is matched to the frequency of the driver signals and this is sent to the mixing circuit (92) supplies. 6. Circuit arrangement according to claim 5, characterized in that the frequency the phase signals matched selective device (82) is preceded by a TOR circuit (80) is, which in its blocking state only affects the frequency of the driver signals matched selective device (88) by signals occurring at the input (78). 7. Circuit arrangement according to claim 6, characterized in that the on the frequency the phase-determining signals matched amplifier (82) upstream TOR circuit (80) is switched to the blocking state by a signal which is transmitted from the output of the to the frequency of the drive signals tuned amplifier (88) is derived. 8. Circuit arrangement according to claim 1, characterized in that the frequency of the phase-determining Signals a fraction of the frequency of the clock signals and the frequency of the driver signals is an integer multiple of the frequency of the clock signals. 9. Circuit arrangement according to claim 8, characterized in that when using phase-determining signals of half the frequency of the clock signals of the frequency multiplication circuit from a frequency doubler (84) and downstream frequency multiplier (102) exists and the clock signals are tapped from the frequency doubler (84). 1 sheet of drawings