DE1762418C - Voting display on the screen of a television receiver - Google Patents

Description

F i g. 2 the circuit of a conventional Αϊ> direction shifted in parallel to lower frequencies, voice display. So if the amplification of the audio signal increases, so

F i g. 3 the circuit of an inventive one becomes a higher one corresponding to the subcarrier Tuning display, gain shifted. During the viewing

F i g. 4 at different points of the circuit 5 direction of the image thus results when a from F i g. 3 occurring waveforms in such a beating a deepening of the colors, the correct and in the detuned state, to an overshoot due to the damping

F i g. 5 the circuit of a rr can lead to the output of the outer carrier wave system. Takes the Circuit of FIG. 3 fed circuit, local oscillation frequency, then the sound signal

F i g. 6a and 6b waveforms for d ^: e explanation io gain increased, but the gain increase is the function of the circuit of FIG. 3, much less than that when moving the

F i g. 7 the switching of a further execution local oscillation frequency to higher frequencies form of the invention, resulting change, ir.i image are therefore

F i g. 8 the circuit of a third embodiment cannot be observed in this case of the invention, 15 ^ chten. At the same time, however, the subordinate

F i g. 9j, 9k and 91 decrease at different points of the amplification and thus the color depth. So Circuit of FIG. 8 occurring waveform and results in a migration of the local vibration

F i g. 10 the on-screen one .; TV frequency from 500 to 1000 kHz a fading Voting display visible to the receiver in the manner of a color. Further the L> iad will appear blurred, magical eye. 20 because the higher frequency component of the video signal

A radio wave received from an antennae is amplified due to an increase in the carrier wave is generally attenuated in a tuning device.

mixed with a receiving frequency and into a.

Video intermediate frequency | implemented. This is transmitted via the local oscillation frequency in a video intermediate frequency amplifier to a receiver and also in a black-and-white television video amplifier. The recipients for the section must be avoided.
between the antenna connection and the input F i g. 2 shows a conventional voting display,

of the video amplifier resulting characteristic curve is in which a display tube 2 with the output terminal F i g. 1, the channel f being connected to that of an IF detector circuit 1, for example. However, one of the frequency allocation valid in Japan 30-like device has the disadvantage that it is. The carrier wave is in this case at 177.25 MHz, its own display tube 2 is provided, the color subcarrier at 180.83 MHz and the audio signal must. On the other hand, devices require those at 181.75 MHz. In a color television receiver using a cathode ray tube as a display tube, there is a risk that the audio signal component will become its own resonant circuit. This is more difficult to modulate with the color subcarrier, but if it is too large to compensate for fluctuations. A beating then occurs at 920 kHz (4.5 - 3.58 characteristic curves due to temperature fluctuations, = 0.92 MHz). In order to avoid fluctuations in the mains voltage, aging of the envelopes, the audio signal component has so far been added to etc. To stabilize operation, a 50 to 60 db is weakened. Because of the very sharp variety of correction circuits required.
Characteristic curves of such tones must have the frequency 40. A tuning display should therefore be set very precisely on that of the local oscillation. Television receiver screen.
Otherwise, only a small amount of attenuation would result . 3 shows a connection terminal A to which the

and this has an adverse effect on the grid voltage of a horizontal output tube. In black and white television receivers is put. Terminal A is connected in series. Such a beat rarely occurs due to the low damping of the tou trap _{from a resistor ^ 1} and capacitors C _1. So the and C ₂ grounded. In parallel with the capacitor C _{2, there} is a local oscillation frequency of about 1 MHz from the preceding terminal diode D ₅ , the anode of which is earthed. Apart from the values shown, the resolution of the cathode of the diode D ₅ is not significantly impaired with the emitter and the image giving it. A collector of a transistor T _r via a series switch, which is more important in color television receivers, consists of a resistor R ₃ and diodes D ₁ or D _2, respectively, because the color depth is connected at. The cathode of the diode D ₁ is connected to the emitter with fluctuations of a few 10 kHz in that of the transistor T _n with the collector of which the anode of the local oscillation frequency changes sharply. That is a diode D _{1 is} connected. The anode of the diode D ₁ consequence of the fact that the for the ratio of the and the cathode of the diode D ₂ are connected to each other gain at the subcarrier frequency to the maximum. The emitter of the transistor T _r is connected to the overall resulting amplification of the voltage + B (approx. 25 V) of a voltage-determining position of the auxiliary carrier wave in the source, namely via a resistor Λ ₄ . The sloping section of the Kemilinienkune lies where the transistor's large collector is due to a parallel gain changes occur. circuit of a capacitor C ₉ and a resistor

Of course, the various switch positions can be used. ₅ grounded. The base of the transistor T _r is automatically controlled in such a way that the gain of the output detector stage H is automatically changed by the output terminal of an intermediate frequency. The resistance value is kept constant. However, it is almost impossible- the resistance R ^ is greater than that which borrowed an input signal change of 20 db or resistances R ₄ and K ₅ . The intermediate frequency must be followed, including the feedback loop 65 detector stage H is constructed similar to conventional arrangement strength of the automatic control with a fixed voltage of this type. It consists of a value. If the local oscillation frequency increases, so vacuum tube V ₃ , capacitors C ₁₀ to C ₁₇ , the overall characteristic curve is reflected in rows R ₂ , R _i2 to A ₁₄ , R _u and / J ₁₈ , a diode D ₄

and a transformer T ₁ . They differ from conventional collector and emitter voltages at the Tran devices of this type, only that they are effectively used. The sawtooth wave occurring in the fact that a connection terminal of the counterpoint C is connected by Ahsumdes R _n with a movable tap of a column of the upper and lower tips of the variable resistance A, _G at point B. of the 5 occurring waveforms with the help of the diodes D ₁ / between voltage source and earth. Am and IX, reached. The level heights at which the waveform occurring in the screen grid of the amplifier tube V ₃ is a very point B to be split. A low voltage of a few 10 V, so that one speaks of what has been said, apparently the Kollcktore receives a sufficient limiting effect, whereby and the emitter voltage of the transistor T _T. you always have a constant detector exit. io The splitting will now be described in more detail. The detector output contains video signal components- Are the gap levels or the emitter and collector locations and is therefore sent through a filter, the potentiate of the transistor T _r given by E ₁ and E ₂ , from resistors A ₁₂ , A ₁₃ and A ₁₄ and conduction so that part of the sawtooth wave which consists of E ₁ above C ₁₀ , C ₁₁ and C ₁₂ , the high frequency increases, diode D _{1 is} conductive and diode D ₂ does not switch off components and video signals. That make 15 leading. The amplitude S ₁ of the DC voltage obtained at point C is applied to the base of the waveform that occurs, which exceeds E ₁ , is geTransistor Tr . It is of negative polarity, pass through and its absolute value becomes large with good coordination

and be small when upset. The connection _s _ A ₄ ^ ^ A ₄ ^

point C between diodes D ₁ and D ₂ is via an ao '' A ₃ 1 R _t R ₃

differentiating circuit grounded, which consists of a capacitor C _a and a resistor Ä _e . Fine where 5 is the amplitude of the sawtooth wave, the E ₁ diode D ₃ is connected in parallel to the resistor /? “, Exceeds. S, is very small compared to S, since R ₃ > Λ ₄ . one of which is connected to the input terminal of an amplifier circuit /. This means that the sawtooth wave at level E _{1 is connected.} This is a her- 35 split.

Conventional two-stage amplifier with amplifier tube- The part of the that flies between the levels E _{1 and /}

Ren V ₁ and V ₂ , resistors R ₁ to A ₁₂ and capacitor sawtooth wave make both diodes D ₁ and D ₂ not capacitors C ₄ to C ". Its output terminal F is conductive at point C, and the waveform occurring at point C, with the grid of a color, will therefore be the same as that at point B. differential signal amplifier tube connected. HEREINAFTER 30 The portion of the sawtooth wave which is smaller than e _2, is now the operation of the circuit described makes the diode _D2 conducting and the diode D ₁ will not. At terminal A , sawtooth conductors. The amplitude S _{2 of} the part of the waveform, waves for the operation of the horizontal output tube which is smaller than E ₂ , is therefore given by. They are so through the capacitors C ₁

and C ₂ and the diode Z) ₅ formed. The waveform 35 K _{5 R &}

at point B there should be a sawtooth, the amplitude of which is S _£ = · S ^ · S.

is greater than the highest collector-emitter voltage ^Λ 3 * «s K ₃

of the transistor T _T.

As already explained above, the detector S ₂ becomes very small again compared to S, since A ₃ > R _s . The

output of the intermediate frequency detector stage H a 40 means that the sawtooth wave at level E _{2 is} negative maximum voltage when the local is split. In this way, the sawtooth wave oscillation frequency is tuned. When detuned vertically symmetrically depending on the base, the output is a small negative voltage. If the potential of the transistor T _{r is} split, the local oscillation frequency is completely detuned. After the explanation given here above, the

so the output becomes OVoIt. If it is 45 sawtooth shaft split above and below. However, if a sawtooth wave with better linearity is applied to the transistor T _r shown in the drawing, a pnp transistor is applied. the base voltage is around (cf. in FIG. 6a, wave a1), the higher the base current, the less there is a tendency. In the ab- the upper tip of the sawtooth wave, which is shown in FIG. Since the correct state flows, therefore, an increased base curve is to be assumed for al shown. The current, so that also the emitter and collector currents 50, is a consequence of the fact that any change in the is increased. If the saturation area of the Tran base potential of the transistor T _{r has reached} a change in the transistor T _T , its three parts, that is to say the internal resistance of the transistor T _r, result. The collector, the emitter and the base essentially making the impedance from point B towards the same potential. If the local of the transistor T _{r is} seen changes. If the clamp oscillation frequency were gradually detuned, the diode D _{5 would} not be present, and the mean level of the emitter current would decrease. If the transistor is completely switched off with the sawtooth wave relative to the gap levels E ₁ and E tct, then its millimeter voltage is shifted up or down like the span, as is shown in FIG. 6a intimately -I B and his Kolleklorspanming OVoIl. Which is shown at «3. The center lines of the in F i g. 3 variable resistor R ₁₆ serves to input a removable bottom signals (see FIG. In FIG. 6b unchmen the position such vm /. That the saturation h 60 signals 1 and bl) would then be in the region of the Ste'lung Λ3 and Ba The transistor is reached as soon as the fully shifted, as shown in FIG. 6b can be seen. Has constantly coordinated state occurs. The movable one on the screen has a vote display. A tap of the resistor ₁₆ is wränilciliehen DES so, is connected, in this case the center line of the display at hall) so that a bias voltage at the IF variations in the width moved undesirable. Dclcktoraiispniiß arises, so that with further use 65 iv, i _S | therefore the _{clamping diaphragm D 5 is} provided, which prevents the slightest oscillation frequency from shifting the figure upwards and closer to the IU range of the transistor 7 ", downwards, and thereby also preventing shifts iiImIj'I. iliiiiliiiiji.j'i measure, the resulting center line of the voting display on the hiIiI-

7 8

screen of the picture tube makes impossible. In the following, an example of a circuit will now be described at the various points in tuned, state and occurring in the detuned state with the waveforms of the signal at the terminal F. In coordination, the width of the gratings in color difference signal amplifiers of the terminal F is supplied removable pulse low, wähwerden Kau: .. F i g. FIG. 5 shows a matrix circuit from FIG. 5 which is large in the detuned state. By means of an amplifier tube K ₁ for (R-Y), an amplifier application of such pulses to the color difference tube K ₅ for (G-K) and an amplifier tube K for amplifiers, it is therefore possible to display a tuning display (fl- Y). The connection terminal F (see FIG. F ■ g. 3) is obtained with va , like FIG. 7 shows the grid of the amplifier tube K ₅ for (G - Y). The circle for the tuning display can only be linked. Output signals of an x-axis and an io on the setting of the local oscillation frequency>'- axis demodulator will act on the lattice gill, and it is necessary to apply it during the normal menue R or Ader tubes K ₄ or K ₅ , and switch off the operating mode, while the anode signal of the tube 4 is not on the grid clamp G is required. For the tube to be fed to terminal A, V _{% is applied} , which creates a matrix circuit, sawtooth wave, that of the vertical output circuit. 15 opposite that of the horizontal output circuit

When creating the in F i g. 4 draw the rectangle shown at F.

wave only the amplifier tube K _{s is} not conductive, FIG. 8 shows the circuit of a third embodiment during the amplifier tubes K ₄ and K, conductive form of the invention. In this case, the input is denominated, so that its outputs are given to the corresponding terminal J via a resistor and a clamping grid of the picture tube CRT . As a result, ao diode D, grounded and connected to the diode D ₄ in FIG. 3 of these, the central section of the image, shown IF stage, is connected via a diode D _{7 and a resistor A 1} , while the remaining sections are greenish. The input terminal J den. is also grounded via a series connection of a capacitor C ₁ and a resistor R ₁₀ at terminal F , as shown in the first grid of the tube V ₁ in FIG. 3 as the output terminal L is at the upper end of the is fed, so you can connect pulses against resistance R ₁₀ . The in F i g. 9 J set polarity or negative pulses received. If such impulses are clamped to the (G- VVVerstärker- OVoIt and given to the IF detector output tube, this is interrupted, whereby voltage is passed through the diode D. It becomes positive impulses at its anode . occur thus, it is 3 ° then through the resistor R ₁₀ and the Kondenmöglich, on the screen, a green display to ER- sator C _ie differentiated somewhat, namely so weak stopped. the remaining portions are mainly that the input waveform is shaped somewhat and Magenta The reason that the remaining one receives the waveform of Fig. 9L at the output section the complementary color of the center terminal 9L. The signal will take on a differential section is to be found because the output section decorative circuit given, and the resulting signal input square wave to the color difference amplifier can operate a multivibrator r output, for example, to the grid terminals of the zero level depending on the pulse width color difference amplifier, so occur on the changes. That portion of the waveform where the screen has two vertical lines, as shown in FIG. 10 above the zero level, corresponds to the color green, 40 shown. It can be determined in this way whether the television receiver is out of tune or well tuned during the section below zero level. This corresponds to the magenta red. It follows from this that, with good coordination, both lines will appear magenta as the pulse width increases. coincide and if they are out of tune, differentiate the split waveform in the back. It is of course also possible, in the manner described above, with the aid of the +5 condenser at terminal F of FIG. 3 or the terminal L sators C ₃ and the resistor R _t , then the in FIG. 8 obtainable waveforms instead of the wave occurring at point £ a square wave. Color difference signal amplifier of a Farbfernsehemp-Die Diode D ₃ is used to catch large negative peaks on a video amplifier or X and Z demo, which give when differentiating through the dulatorenzu. With black and white television receiver capacitor C ₃ and resistance R _t result. They are gladly given to the video amplifier. Since such a negative peak occurs during the horizontal scan, the IF detector can also be a video signal detector zontal retrace of the horizontal scan or a sound signal detector, there is a tendency that the magnitude of the equals changes when the self-oscillating circuit through the amplifier is required, whereby tubes K ₁ and K ₁ amplified wave are applied to the color difference amplifier despite the simplification of the circuit complexity. In order to keep the amount of the current return constant, an accurate, stable and effective operation is therefore preserved. Moreover, it is not necessary to have a special diode D ₃ . To use the amplifier tubes K ₁ and tuning indicator tube. Nevertheless, K. serve to reinforce the wave occurring at point E , an accurate tuning can just as easily be achieved and at the same time the rising edges 60 are sharpened as when using a magic waveform. The two-stage eye, as a voting display signal on the image intensifier effect, is not absolutely necessary. The screen of the television tube appears and, through wide tubes, fluctuations in the rod-shaped signal _{can also be replaced by transistors 7V 1} and T _{ri, as shown in FIG.} 7 is shown. F i g. 4 good indications.

For this purpose 2 sheets of drawings

Claims (4)

1 2 Change in the duration of electrical impulses in patent claims: depending on an electrical control variable and works with at least two control grids 1. Voting display on the screen of an electron tube using two screen grids, Television receiver, in which one with the line 5 whose first control grid preferably the pulse or screen frequency matching signal are fed negatively, while in the screen grid with Inclined flank, like a saw tooth, in a circle means of a type known per se for generating dependence on a sawtooth voltage from the first control speaker and a grid-fed pulses are provided in the coordinated state. the Maximum or minimum value assuming equal io control variable is z. B. a variable DC voltage split and one in its width from the voltage and becomes the second control grid of the elec-gap level dependent rectangle wave fed to the tronenröhre. The DC voltage is included Screen of the picture tube is made visible, dimensioned so that the resulting on the screen grid characterized in that the sawtooth voltage in accordance with this control variable Signal with a sloping edge at an upper and 15 more or less controlling the anode current a lower Spatuiungspegel is split and the tube and thereby the width of the at the anode influences the width of the a> -f visible impulses on the screen. Will equal powers Rectangular wave the length of the inclined voltage used to generate a pulse on each Flank between the gap levels. Line in the same place, one obtains 2. Voting display according to claim 1, characterized ao on the screen, a vertical line or bar marked that the square wave to a pattern that is from the Al tuning state of the television amplifier element of color demodulators or receivers via the color difference amplifiers supplied to the second control grid of a color television receiver led direct voltage are made dependent gers is placed. can. 3. Voting display according to claim 1 or 2, there- 35 In another known-n voting display, characterized in that the voting (German Patent 1 007 802) is a state-dependent voltage to determine the vote-dependent DC voltage together gap level di. Base of a transistor (7 »with an alternating voltage, which is placed, for example, between which there may be a remaining sawtooth, a control electrode of the picture electrode and earth a first resistor (A ₅ ) 30 tube. This can be switched on the screen is, while between the other a black and white image pattern is generated, the remaining electrode and a DC voltage white or black component with optimal coordination, voltage quaMe (4-5) a second resistor (/ J ₄ ) i.e. a minimum at maximum DC voltage and with these two electrodes each is one of. two diodes (D ₁ , D ₂ ) are connected, which are polarized in opposite 35 The well-known voting indicators set for the direction and at their other ends are connected to assess the voting status so the safe in a point (C), in which to them Estimate the location of a black-white border across a third resistor (R ₃ ) ahead of the voltage. The operator is however generally with a sloping edge and a waveform rule is difficult or not possible at all, circuit (C ₃ , R _t ) is connected to the split signal taken from this point for practical purposes not very suitable in use. reshapes the rectangular shape, and that the object of the invention is to state value of the third resistor (A ₃₎ considerably display a'jf the screen of a television receiver is set to be higher than to create the Widerrtandswert of the R _s corresponds to the known first in their effect and the second resistor (A _4, in 45 magic eye. F1 g. 3). This object is achieved according to the invention 4. voting indicator according to claim 3, characterized in that the signal with a sloping edge is characterized in that between the terminal (B) upper and a lower voltage level split of the third resistor (R ₃ ), in which the sawtooth is and the width the wave that is visible on the screen is fed in, and a clamping 5 ° square wave made of the length of the inclined diode (D ₅ ) is connected to earth. Flank between the gap levels. Through this measure is achieved that just as with the magic that has been tried and tested in radio sets Eye the tuning state not a black 55 corresponds to the white border in a certain position, but rather for example the minimum width of an in between The invention relates to a voting display in dark fields enclosed light bars. at on the screen of a television receiver, in the process of approaching the optimum Ao tuning state one that matches the line or grid frequency, for example, the light bar becomes increasingly narrow, tuning signal with a sloping edge, like a 60 to itself after passing the optimal tuning sawtooth, to widen again depending on one of the voting status. You get one like that Appropriate condition and in the coordinated manner, very pleasant to use and, moreover, simple stood a targetable voting display that accepted a maximum or minimum value. DC voltage split and one in its width In the drawing, the invention is an example illustrates the square wave dependent on the gap level on the 65, namely shows The picture tube screen is made visible. F i g. 1 which resides in a color television receiver Eiivi well-known voting display of this type (German result between Aniennenanschluss and output Patent specification 1 068 754) has a circuit for the frequency-dependent characteristic curve,