DE1914564B2 - DISPLAY CIRCUIT FOR COLOR TV RECEIVER - Google Patents

Description

1 2

The invention relates to a display circuit for F i g. 1 a block diagram to explain the tech-

Color television receiver, which is used for receiving a frilly thought of the circuit according to the invention, Variety of different color or black and white F i g. 2 one for the operation of the invention

Programs are suitable and a device for switching required chip form, have visual display of color programs. 5 F i g. 3 a circuit diagram of the main part of the invention

Today it is often possible for the television audience to use the color television receiver display panel, to choose between several programs. tion,

Frequently, this concerns part of the pro Fig. 4a to 4e and 5a to 5d voltage diagrams to color programs, in another part grams to explain the invention to black and white programs. Also a certain io circuit,

Program is occasionally broadcast for part of the F i g. 6 and 7 circuit diagrams of parts of the

time as a color program, for other broadcasts appropriate switching, broadcast in black and white. F i g. 8 is a circuit diagram of a further part of FIG

It has already been proposed (British color remote display circuit according to the invention 1 082 429), color televisions with a 15 vision receiver,

To provide color lock, which responds when in F i g. 9 a block diagram of a further embodiment

the channel selected on the receiver is only one form of the invention,

Black and white program is received. Known Fig. 10a, 10b and 10c voltage curves for the

is already a device (German interpretation clarification of the circuit shown in FIG. 9 and writing 1 132 609), which for radio receivers or? o Fig. 11 and 12 circuit diagrams of further designs Sound part of television receivers indicates whether in the form of the invention.

the currently selected station single-channel or more- First, the principle of the invention is closer

channel, i.e. stereo is sent. The known explained.

Devices can also be equipped with a display In addition to an ordinary channel selector,

Device, for example one on the viewing side 25 as it is installed in a conventional receiver arranged glow lamps, that is, a special tuner is provided (in the following lights up if in the selected channel one is designated as the auxiliary tuner), its tuning frequency color program is available. frequency and receiver oscillator frequency with a

Such a device allows the control voltage to be changed, which is connected to the resonance detection, whether it is the currently selected pro-capacitors (i.e. voltage-dependent condensers is a color broadcast. This would be done by sators) of the tuner group and the receiver oscillator If the color lock is switched off, but also a view of the gate circle is placed through the color programs the screen suffice. To identify the stations to be specified. The above ground other transmission channels imagined being sent, control voltage applied to the auxiliary tuner Program type (color or black and white) must be changed over time, so that the auxiliary tuner of the all channels one after the other and one after another by hand to the frequency of each transmission wave will. is true. In this way, the television

The object of the invention is to transmit a coloring wave in the entire frequency band or in part To provide television receivers with a device to receive the same in sequence. The temporal from which the observer can see at a glance that 40 changes in the control voltage are inevitable which of the various possible reception-specific time intervals causes: channels currently coloring programs and in which If the auxiliary tuner is on a program of a

Black and white programs are broadcast. is tuned to a certain frequency, the

According to the invention, this object is achieved by the output voltage of the auxiliary tuner being connected to a circle, the use of a tuner which, independently of the 45, is able to determine whether or not it is a color broadcast for the color television receiver currently selected (hereinafter referred to as Receiving channel designated by a control circuit to him color television signal display circuit). The corresponding control voltages of the series output of this circuit are used to control a color after, automatically and periodically all possible television signal channel indicator, which also runs through borrowed receiving channels and one of the 5 ° to a usually in a television receiver belonging to a color circle built-in received signals or mechanism for displaying program or a black-and-white program is provided for the respective receiving channel. A "1" - or a "0" - is displayed next to it, whether the received remote signal emitting color television signal display circuit sehignal belongs to a color television program, whose output signals control signals ^: 55 or to a black-and-white program. The color for a plurality of each receiving channel television signal channel display has a display device assigned to electronic switches, which are usually connected in directions by changing a conductivity of the switch responsive display device part or all of the known directions. a television receiver built-in device

Since the television audience often receives color broadcasts 60 for displaying the reception channel that they prefers, it is through this training a color indicates whether the received television signal to a television receiver easily and without assistance - color television program heard or not, would take any program previews the possibility. Furthermore, between the device for displaying

Given the possibility of color programs under those of the color television channel and the color television signal Recognize receivable programs and 65 display circuit a further circuit provided.

to select. _lV Through this circuit, the from

In the drawing, the invention is for example "\ auxiliary tuner and the input circuit of the device

illustrates, namely shows ^; recommended to display the color television signal channel.

3 4

caught frequency can be switched. If example circuit. Resistors la, 2a, 4α and 5a, and a, a frequency / "is received, the transistor 3 is α form a ^ amplifier that given the output of the color television signal display circuit to phase the control voltage shown in FIG 4a, the display device displaying that she turns back. The phase-reversed Ver frequency in this way is the «th channel frequency. When a frequency 5 course of the voltage, as shown in Figure 4b, it is frequency / _{"+ 1} is received, the output is connected via a capacitor 6 a to the base of color television signal display circuit to the display pulse generating transistors 9a, 9b ... 9 η placed, given device which indicates that the frequency is a pre (n + l) th frequency at each via a resistor 7 α, etc. In this way, voltage is applied. During a period of time ^ for all television signals it is indicated whether they result in an io to t _± ' , the base of each transistor 9 a, 9 b ... 9n is colored or in a black and white program on a voltage F ₀ ' held. Listen during this. This display is repeated at regular intervals of time, the emitters of the respective Transtands. Here, the Anzeigevorrich- sistoren by means of resistors 11a and 12a, an integrating action tion effect, so that the Ub and 12b and Un and 12m biased display, after which a certain program, a change in the color 15 that all of the transistors 9a , 9b ... 9 η is non-conductive commercial television program during a predetermined den. In order to make only the transistor 9 a conductive, the period of time is maintained from the time in which, at time t _2, a voltage F ₀ 'is applied to the base of each transistor indicating a color television program, the reverse is briefly applied to the device has been given until stands 11 α and 11 b dimensioned accordingly, and by the time the next such signal 20, the emitter bias for the transistor 9 a , arrives there. By repeatedly tuning it to be chosen so that it is a little lower than the certain channels and passing on a coloring voltage F ₀ '. In this way, a square wave can be tapped off at the collector of the signal indicating the television program to the transistor 9a, in the aforementioned display device a voltage drop occurs at time t ₂ in certain time intervals. 25 Fig.4c shown. The collector of the transistor 9a show whether the received television signal is a far- biased via a resistor 10 α. This bigen or a black and white program pulls the voltage drop until the base voltage stops. This is also the case with all other television signals that the transistor 9a becomes lower than the voltage F ₀ ',. the case. As a result, it is during reception so that the transistor 9 α is non-conductive. Now a particular television station possible to display 30 is shown by differentiating the in FIG. 4 c dargestellwelche of the television stations including the straight th voltage by means of a capacitor 13 α and received color programs. a resistor 14 α generates a pulse voltage,

The above description concerns a case where as shown in Fig. 4d. The positive pulses are an auxiliary stuner in addition to the channel selection tuner blocked by a diode 15 α, so that only the negative is seen, which is usually built into a television sensitive pulse to the base of a transistor 18 α catcher. In a television receiver, in which the vertical synchronization circuit an AFN is tensioned via resistors 16 α and 17 α before. On the transistor, a Phasenum function is performed (automatic frequency control) Removing transport with the result that at a Widerübt, but a circuit arrangement is stood verwen- a biased collector of transistor det 19, in which a received frequency with a 4P α 18 positive Impulses appear. Is changed by exciting a control voltage and acts as a monostable multivibrator 21a with the help of this building tuner. The received frequency received from the tuner via a capacitor 20 α is only continuously changed for the duration of the output voltage, as shown in FIG. 4e - the vertical synchronization signal. The set, which is reversed by a phase reversal stage 33 α pha voltage of the circle, for example a color 45, and then to the emitter of a trans-blocking circuit in which the voltage is applied when a sistor23a is received, the base of which is based on a color program in relation to the Receiving a resistor 22a is grounded. In doing so, the transistor black and white program is changed, 23a is then placed at its emitter with the help of resistors on the display device. In this way, 24 a and 25 a is always biased so that it is not possible, in the same way as when using 50 conductive state, even if that of the auxiliary tuner mentioned above to indicate simultaneously for all color television signal display circuit2 during the television channels whether they represent color or black reception of a color broadcast made available to white programs. . positive voltage F _{1 is applied} to its base.

E i g. 1 shows a first embodiment of the invention. Accordingly, the transistor 23 is only conductive, which makes it conductive for displaying color television signals 55 if its base voltage has an auxiliary stuner 1 during the time, and also a color range between t ₂ and t _s F ₁ assumes a waveform shown in visual signal display circuit 2, electronic switch 3, FIG. 5, which corresponds to the display device, which shows a color transmission channels, reversal of the voltage profile shown in FIG. 4e, direction 4, a control circuit 5 for generating the. In this way, a voltage appears at the collector control voltage and a conventional color 60 of the transistor 23 α, as it appears in television receiver 6. A case is described, FIG. 5 b is shown. You can also see a coil in which the transmission and reception in the NTSC 26 a and a capacitor 27 a, via which a mono system takes place. With a stable multivibrator 28 a generated by the control circuit 5 by a positive Im control voltage, as shown in FIG. 2, the pulse of the voltage shown in FIG. 5c excites the tuner at a voltage F ₀ on a channel a, 65 is that one of b by differentiating in Fig. 5b at a voltage F ₀ to a channel and depicted voltage capping with the aid of a tension F _n on a channel "tuned". a circuit 32 α built-in diodes and phase '

■■■■ Fig. 3 'serves to explain the operation of the reversal in the phase reversal stage. If

5 6

the quasi-stable period of the monostable multivibra an IF amplifier 201, also selects a video motor 28a long enough, a collector current or detector 202, a capacitor 203 is caused to block an emitter current, through a transistor 29a of the direct current and a transformer 204, the flow through the output voltage of the multi- at a frequency that is the same as that of the color carrier frequency vibrator 28 a for a substantial part of the time, together with a resonance condenser span from t ₂ to t _{n + 2} , namely from t ₂ to t _{2 + x} in sator205 can oscillate. Resistors 206 and 207 F i g. 5 d, is made conductive, causing a lamp to illuminate biasing a transistor 209 in 30 a. If, accordingly, the auxiliary tuner is applied in such a way that a higher negative control voltage is applied at its base than at the emitter. Furthermore, an excess value is assumed, as a result of which a bridging capacitor 208 corresponding to this value is provided. The Trandes certain television signal is received, results in sistor 209 works in .B circuit. A capacitor has the possibility that only the respective switching 210 and a transformer 211 act as a load for the transistor (one of the transistors 23 α, 23 b ... 23 η the transistor 209. They form a resonance circuit, in Fig. 3) only during the reception of a color which oscillates at the color carrier frequency. Is made conductive via a television program, so that the 15 resistor 212 is developed a voltage drop, precisely tuned by the auxiliary stuner frequency while the transistor 209 is conductive. The circuit corresponds to that of the channel denoted by the indicator circuit also has a bypass capacitor 213 (the lamp). Behind condensate and a stop acting as a switch transistor 214 on, satoren20ö ... 2 On connected circuits, the α formed by resistors 215 and 216 such vorgedem monostable multivibrator 21 and is clamped the Sequence 20 so that the emitter potential is lower than the circuits correspond. the base potential. With the collector of the transistor

Fig. 6 shows a simple example of a control 214, a load resistor 217 is connected. If a circle 5 to generate the control voltage. In this case, the radio wave received by the auxiliary tuner 1 consists of a sawtooth voltage generator belonging to a color television program, a color signal is contained in the output resistor 101, a capacitor 102 and a 25 of the display circuit. This diode 103. The diode is polarized in such a way that when the signal component is on, the transformer 204 applies a voltage that is higher than a predetermined voltage and the resonance capacitor 205 is removed, a certain voltage, becomes conductive. For example, the transistor 209 will only be an AC-controlled silicon diode during the positive half of the period of the signal conductive. This makes it available under the trade name THYDAC. 30 develops a potential at the resistor 212 - If the capacitor 102 is differential across the resistor 101 , at which the base potential of the transistor is charged up to a voltage at which the 214 is lower than its emitter potential, whereby the diode 103 becomes conductive, the in the capacitor 102 the transistor 214 becomes conductive. As a result, stored charge corresponds ■ currently discharged so that the wraps the load resistor 217, a clamping capacitor 104, a sawtooth voltage 35 generates voltage V _x, which is given to the electronic switch 3 as shown in F i g. 6 shown at /. Which is surrendered. If, on the other hand, the voltage received by the auxiliary tuner is then divided into a black-and-white program stand 105 and 107 by the reflected television signals. In this case, with the help of a belonging, no signal appears at the base of the resistor 106 of the base of a transistor 112, a transistor 209, so that it becomes non-conductive. Da-base bias is applied while at its collector 40 through the base of transistor 214 is connected to + B gate resistors 108 and 109 and held so that transistor 214 remains an emitter bias via resistors 110 and nonconductive. Therefore the potential at the collector of the 111 is applied to its emitter. In this case, the transistor 214 equals zero, that is, the correct selection of the values for these resistors at the voltage takes a voltage generated during the reception of a color remote collector of the transistor, as shown by a positive value V ₁ , while it is shown at K . The collector voltage, which was the output while receiving a black originally a + B voltage, starts on white program becomes zero.
In the following, the display device 4 is explained in more detail by means of a prelude placed between the base and the emitter.

voltage drop resulting from the upward prestressing. 5 d to fall off. Thereupon the collector current is taken as the output of the monostable multivibrator 28 a so that the voltage drop stops. As a result, even if an over-received from a transmitting station, the voltage marked K is obtained. The transmitted signal only during the time AT (= t _t - i ₂ ) through transistors 112 a and 112 & formed current of the repetition period T or during the time cycles are connected in parallel with transistor 112 55 span from t _t to t _{n + 1} (this is equal to the time span and can generate similar outputs L and M. From t ₂ to t _{n + 2} ) is received, the collector current - the point of the sawtooth wave / at which the circuit of the transistor 29α in Fig. 3 causes While transistor 112, 112a or 112 & becomes conductive, a substantial part of the repetition depends on the flow between the base and the emitter of the respective period T , so that the period of time during which the transistor is applied depends on the DC voltage. 60 which the lamp lights up is much longer than that while the superimposition of the voltages K, L and M causes the lamp to be switched off. This results in a voltage curve as shown at N. This appears to the naked eye as the lamp appears as undervoltage at a resistor 113. The broke glowing. The number of steps in the step voltage that the lamp 30 α (Fig. 3) can be increased by turning the display device is disadvantageous because increasing the number of steps of the transistor circuit 65, such lamps have a short lifespan. considerable ¹ amount of energy is consumed for them and

Fig. 7 shows a block diagram of an example when increasing the number of lamps of the energy

the color television signal display circuit 2. This has consumption is increased accordingly. By

Use of light-emitting diodes made of GaP or a television program is tuned, which can be received from him mixed crystal made of GaP and As or the like, as shown in FIG corresponds to the second vertical sync signal. Reduce energy consumption and extend the service life The signal conductor circuit 321 conducts the output voltage. F i g. 8 shows light-emitting diodes 31 α, 5 of the color killer circuit 316 by means of a mechanical 31b .. .3In, monostable multi-vibrators 28 a, 28 b watch or electronic switch in synchronism with and 28 η and transistors 29 a, 29 b and 29 n. the circuit 319 operates to a display circuit

In the following a device will be described, 322. Furthermore, the circuit 319 is controlled by the tuner without arrangement io 320, which was originally built into the color remote auxiliary control voltage of the control voltage generator, so that the output of the shut-off auxiliary tuner is precisely controlled for all television signals at the same time connected to the lamp, which indicates whether it is indicating a color program or a black-received channel. The display circle 322 represent white program. The invention is so described in connection with Fig. 3, that it relates to a color television ^ - written monostable multivibrators 28a, catcher, at which a frequency to that of the 15 28b ... 28 n, the transistors 29a , 29b ... 29η and tuner is matched by a control voltage to the lamps "'30 α, 30 b ... 30 n.
is changed and in which the vertical synchronous circuit In the following, the invention in its application

with AFN effect (automatic frequency adjustment to the NTSC system described in more detail. Der mung) works. It is also assumed that, for the sake of simplicity, it is assumed that only three color televisions, the vertical synchronization can normally be achieved even if they are transmitted from stations a, b, c. It is also assumed that the vertical sync signals are alternately taken out television signal α from the color television receiver received so that they are reduced to 30 per second (at gen and that the received signal is 60 Hz), and that the AGC circuit, a color program represents. In addition, it is assumed that the IF circuit, the video detector circuit, the color signal circuit, the output voltage of the stronger circuit, the tuner circuit etc. all have such a color blocking circuit 316 during the reception of a speech characteristic that it normally assumes a positive value F _{1 during the reception of a speech characteristic} , rend of the appearance of the vertical sync signals while he was receiving a moonlighting. ■ White program _{assumes a value F 0} , which is low

FIG. 9 shows a tuner 301 in which the output is lower than F ₁ . If the output voltage of the voice frequency is changed with a control voltage generator 320 connected to the tuner equal to a span control voltage, furthermore an IF voltage V _b , the reception of the television signal b amplifier 302, a video detector 303, one when the vertical sync signal is received Circular video amplifier 304, a three-beam color picture tube radio wave α at a point in time I ₁ (Fig. 10a) enables 305, a sound section 306, an AVR circuit 307, a light, then the circuit 319 is operated so, synchronizing signal separator 308 , a vertical synchronization that the output of the control circuit 318 is interrupted to the time-chronometer output circuit 309, a horizontal synchronization point t ₁ , whereby the voltage output circuit 310 and a bandpass amplifier 311 V _{b is given} to the tuner. This is used for color signals. A further color signal bandpass converter is provided for the remote amplifier 312 (second stage) transmitted by station b, to which a 4 ° visual signal is tuned. When the broadcast wave transmitted by station b color blocking voltage and blanking pulses present a color program. At a return pulse amplifier 313, the output voltage of the color lock return pulses for removing and amplifying circuit takes on the value of the voltage F ₁ , which in turn only gives the pulse signals. A color carrier generator via the signal conductor circuit 321 to the display circuit 314 is used to form a color carrier. 45 322 is given, which indicates that the next are provided: a color signal demodulator station b transmits a color program. Thereupon 315, a color blocking circuit 316, a Ausastimpulsgene- is the output of the circuit through the circuit rator 317 and a control circuit 318 for generating a 319 at the time (Z ₁ + 2/60) (Fig. 10b) again un-control voltage, from the which is interrupted by the tuner 301, as a result of which a voltage V _c to the tuner depends on the reception frequency selected. Furthermore, the 5 ° is given. Assuming that the television signal c color television receiver still belongs together, when received by the tuner 301, a black 319, 320, 321, 322 and 323, of which the verti-white program is, then the output of the kalsynchronsignalabtrennkreis 323 is suitable , Color blocking circuit 316 to take out the value of the voltage V ₀ , every other vertical synchronizing signal, which is given to the display circuit, whereby on and the circuit 319 an electronic switch 55 is shown that the station c is not a color program, which synchronizes with the vertical synchronizing signals - transmits. At the time (Z ₁ + 4/60) (Fig. 10 c) it is possible to set the auxiliary control voltage F ₀ to the output of the control circuit. Since the broadcast wave a 318 is to be interrupted during the period of time that represents a color program, the display shows before every second vertical synchronizing signal and direction that station α is a color program instead of the output of the circuit that transmits a control 60. In this way it is possible to simultaneously transmit the voltage generator 320 (this control voltage to indicate that the stations α and b color programs are referred to as auxiliary control voltage) and to give station c a black and white pro tuner 301. The control voltage generator transmits grams. If the period of time in which each 320 is so constructed that it can be conductively synchronized with the circuit 319 of the monostable multivibrator of the display circuit to generate an auxiliary control voltage 65, is selected so that it is equal to the period of time to generate voltage that is generated for each second vertical from Z ₁ to Z ₃ , ie slightly shorter than from I ₁ to synchronous signal is changed and the tuner 301 in t _x + 6/60 = Z ₂ , the lamp currents last, which puts it in the position that it is the series after pointing to all that stations α and b color programs

for a substantial part of the period between t _t and t ₂ , so that it appears to the naked eye as if these lamps are lit continuously. At times t _± + 1/60, t _± + 3/60 and t _t + 5/60, the vertical sync signals of the television signal a, which are received by the color television receiver during normal operation, are fed to the vertical sync output circuit 309 , so that the vertical synchronization in the receiver is maintained, while the latter reproduces a picture which corresponds to the program transmitted by the station α. The output voltages generated by the individual monostable multivibrators of the display circuit are shown in FIGS. 10a to 10c. Fig. 10a shows the voltage profile generated by the monostable multivibrator, by means of which the transistor which turns on the lamp indicating station b is made conductive, while Fig. 10b shows the voltage profile generated by the monostable multivibrator corresponding to station c and FIG. 10c shows the voltage curve generated by the monostable multivibrator corresponding to station α.

The following are various ways of practicing the device according to the invention for viewing color television programs.

Fig. 11 shows one of these embodiments, in which a color television signal display circuit 401 is provided, which is connected to the color television receiver 6 in parallel and in front of its switch 402 via its own switch 403 with a mains plug 404 , whereby it is possible to display which station or stations color programs transmitted even if the color television receiver itself is not working. R.

Fig. 12 shows another embodiment in which a color television receiver is provided with a heating device and a heating switch 405 . The color television signal display circuit is connected to the heat-up switch and is so energized when the receiver is in the heat-up condition, thereby making it possible to display one or more stations broadcasting color programs. The heating device mentioned corresponds to the heating circuit of the tubes of the receiver, to which about half of the normal voltage has previously been applied, so that it works when the switch on the device is closed.

Claims (10)

Patent claims: 1. Display circuitry for color television receivers for receiving a variety of different Color or black and white programs with a device for the visual display of color programs, characterized by a tuner (1) which is independent of that for the color television receiver (6) currently selected receiving channel by a control circuit (5) placed on him corresponding control voltages one after the other, automatically and periodically all possible Receiving channels passes through, and by one the affiliation of the received signals to one Color program or a black-and-white program and correspondingly a »1« - or a "0" signal emitting color television signal display circuit (2), the output signals of which are control signals for a large number of electronic switches (3) each assigned to a receiving channel are followed by display devices (4) that respond to the conductivity of the switch are. 2. Display circuit according to claim 1, characterized in that in addition to the channel selector of the color television receiver (6) for the display device (4) an auxiliary tuner (1) is provided. 3. Display circuit according to claim 1, characterized in that to the tuner (301) via a control circuit (318) during the period of every second vertical sync signal, the vertical sync signal of the television signal received at the moment can be applied as a control voltage and during the period of the remaining sync signals one via a Auxiliary control voltage generator (320) generated control voltage for tuning the tuner (301) to the television signals of the stations not being received at the moment. 4. A display circuit according to claim 1 or 3, characterized in that a control circuit (5, 318) generating this voltage is provided for changing the tuning frequency of the tuner (1, 301) by means of an externally applicable DC control voltage that changes its amplitude in steps. 5. Display circuit according to one of claims 1 to 4, characterized in that the electronic switches (3, 319) consist of a plurality of transistors (23 d) , at the base of which the output signal of the color television signal display circuit (2) are placed as a bias voltage, while a control signal voltage of predetermined amplitude is applied to its emitter synchronously with the channel circuit of the tuner, the visual display device ( 30a, 31a) lighting up when the transistor ( 23a) becomes conductive due to the voltages applied to it. 6. Display circuit according to one of claims 1 to 4, characterized in that the control circuit (5, 318) for generating the step-shaped control voltage (N) consists of a plurality of transistors (112, 112 a ...) connected in parallel, at the base thereof a sawtooth wave (/) is placed, the saturation points of which are selected differently and whose collector outputs are superimposed on one another. 7. Display circuit according to one of claims 1 to 6, characterized in that between the output terminals of the individual electronic switches (23 a) and the display devices (30 a, 31 a) monostable multivibrators (28 a) are connected, the output voltage period approximately equal to the channel scrolling period for all of the receivable television signals. 8. Display circuit according to one of claims 1 to 7, characterized in that the display devices are light-emitting diodes (31 « 31 b .. .3In). 9. Display circuit according to claim 2, characterized in that the color television display circuit (401 ) can be connected to the network independently of the color television receiver (6) (Fig. 11). 10. Display circuit according to one of claims 1 to 9, characterized in that the color television signal display circuit (401) in Ab- depending on the heating state of the color television receiver (6) by a provided in this and the heating switch (405) coupled to the off switch (403) of the display circuit can be connected to the network (FIG. 12). For this purpose 3 sheets of drawings