JPS59194582A - Tuning display device - Google Patents

Abstract

PURPOSE:To execute easily a tuning work by reflecting a character and a graphic on a picture, moving its character and graphic, and indicating a direction for operating a tuning control by its moving direction. CONSTITUTION:A signal which has FM-detected a video intermediate frequency signal by a frequency discriminator 32 is applied to a microcomputer 42. Its microcomputer 42 moves up and down a display character on a cathode ray tube 28 in accordance with a tuning state, and indicates a direction for executing a tuning operation by its moving direction. Accordingly, the tuning work can be executed easily, also an attention is attracted by a fact that the character moves, and an abnormal state can be informed exactly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tuning device for color television receivers.

Configuration of a conventional example and its problems FIG. 1 shows a tuning and small device in a conventional color television receiver. In the figure, a video intermediate frequency signal is connected to one end of a capacitor 1, and a bias resistor 2 is connected to the other end.
and 3. The base of transistor 4 is connected. The emitter of the transistor 4 is grounded, the collector is connected to the power source B through the coil 5, and the resonance capacitor 6 is connected to both ends of the coil 5. An anode of a rectifier diode 7 is connected to the center tap of the coil 5, and a smoothing capacitor 8 and a resistor 9 are connected to the cathode.

The other end of the capacitor 8 is grounded, and the other end of the resistor 9 is connected to the base of the transistor 10. The emitter of the transistor 10 is grounded through a resistor 11, connected to one end of a resistor 13, and further connected to the negative terminal of a comparator 16. The collector of the transistor 10 is connected to the power supply through the resistor 12, to the other end of the resistor 13, and to the positive terminal of the comparator 14. A positive flyback pulse is connected to one end of the resistor 18, and the other end is connected to the base of the transistor 19. The emitter of the transistor 19 is grounded, the collector is connected to the power supply B through a resistor 21, grounded through a capacitor 20, and connected to the positive terminal of the comparator 15 and the negative terminal of the comparator 14.

The outputs of the comparators 14 and 15 are connected to the input terminals of an AND gate 16, and the output of the AND gate 16 is connected to the base level of a transistor 22 for driving the green cathode through a diode 1.

The bases of transistors 22, 23, and 24 are connected to green, red, and blue video signals, respectively, and the emitters are connected to resistors 25. Resistance 26. The collectors are connected to the ground through resistors 27 and 29, respectively. Resistance 30. All of the resistors 31 are connected to the IL terminal, and are also connected to the green cathode, red power node, and blue power source of the cathode ray tube 28, respectively.

Next, the operation of this circuit will be explained. The video intermediate frequency signal, which is applied to one end of the condenser 1 by a force 1, is reflected by the transistor 4 by %7. The coil 5 and the condenser 6 are arranged to resonate at the intermediate frequency of the video carrier wave, and the intermediate frequency component of the video carrier wave is detected at the cathode of the diode 7 and extracted as a direct torque. At the optimum tuning point, this voltage is the most effective. When this voltage is traced through the resistor 9 and applied to the base of the transistor 1o, the emitter voltage of the transistor 10 increases as the base voltage increases, and the p1 collector voltage decreases as the base voltage increases. On the other hand, the flyback pulse applied to one end of the resistor 18 causes the transistor 19 and the resistor 21 to
Create a sawtooth wave with Condenser 2o. When this voltage is applied to the negative terminal of comparator 14 and the glass terminal of comparator 15, seven comparator 14. ．． 15. A waveform shown in FIG. 2 appears at each output terminal of the AND gate 16.

In FIG. 2, the horizontal axis is time t, and the vertical axis is voltage ■. 8 is the negative terminal of comparator 14 and comparator 15
B is the voltage applied to the glass terminal of the comparator 14, and B is the voltage applied to the positive terminal of the comparator 14.
The voltage across 7JO to the negative terminal of Di comparator 1
E is the voltage at the output terminal of the comparator 14, and F is the voltage at the output terminal of the AND gate 16. From this figure, when the voltage of B decreases as it approaches the tuning point, it is 9.
It can be seen that as the voltage of C increases, the pulse width of F becomes narrower.

The F pulse waveform is connected to the base of the green drive transistor 22 through the diode 17, where it is mixed with the green video signal and projected onto the cathode ray tube 28. F
Since the pulse is synchronized with the horizontal period, it is projected on the cathode ray tube 28 as a single vertical green band. That is, this band becomes thinner as it approaches the optimum tuning point, and the thinnest point is the optimum tuning point. Disadvantages of this method (・', 1, green '1'j) It is not clear whether all children are in sync or out of sync, and the state of sync can only be determined by observing the movements. .

Purpose of the present invention kn-, 1: Eliminating the conventional entry point as described above, projecting characters or figures on the art dealer, and moving the characters or figures to move the direction in which the synchronization knob should be fully operated. It is an object of the present invention to provide a tuning display device which indicates the direction and makes tuning easy.

Structure 1 of the Invention The present invention is equipped with a character display 'A' display device for displaying characters on a cathode ray tube of a color television set, and a signal obtained by FM detection of a barking intermediate frequency signal by a frequency discrimination circuit is obtained. This tuning display device controls the character display device using a signal to move the displayed characters up and down or left and right depending on the tuning state, and the direction of movement indicates the direction in which to operate the tuning knob.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In Figure 3, 43 is a character generator, 42 is a microcomputer that controls it, 45 is a horizontal flyback pulse, and 44 is a vertical pulse. Character generator 430
The character output has positive polarity and is connected to the base of the transistor 48 through the resistor 52 and to the base of the blanking transistor 46 through the resistor 46. transistor 48
The collector and emitter of are each transistor 22
connected to the collector and emitter of The emitter of transistor 47 is grounded, and the collector is diode 4.
9, 50. Connected to the cathode of 51. diode 4
9. ．． The anodes of 50.51 are connected to the bases of transistors 22.23.24, respectively. The 7' plus terminal of the comparator 41 is connected to the cathode of the diode 7, and the negative terminal is connected to the center terminal of the volume 39 for setting the reference voltage. The output of the comparator 41 is connected to the input of the microcomputer 42.

32 is a frequency discrimination circuit; the input terminal (input terminal is a video intermediate frequency increaser [
1" circuit (not shown) is connected to V, and the output is output from the tuner (
(not shown) is connected to the FT terminal, performs the FT operation, and is also connected to the positive terminal of the comparator 36, 3. This electric uE'ff: FT electric moon and 吾hi, usually between 0 and 12V; the optimum tuning point is 6
It becomes v. The negative terminals of the comparator 36 and the negative terminals of the comparator 37 have reference voltages f, r! -4, G IND from the power supply to increase
Resistors 33, 34, and 35 are connected to straight line 11, and the intersection of resistors 33 and 34 is connected to the negative terminal of comparator 36, and the intersection of resistors 34 and 36 is connected to comparator 3.
Connected to the negative terminal of 7. The reference voltage of the comparator obtained in this way is 6mm for the comparator 36.
The voltage of the comparator 37 is set higher at about 8v, and that of the comparator 37 is set at 6v and lower at about 4v.

The outputs of comparators 36 and 37 are connected to input terminals of microcomputer 42. Note that parts that are the same as those in Figure 1 are designated by the same numbers.

Next, the operation of this circuit will be explained. The microcomputer 42 controls the character generator 43 to display characters at predetermined positions on the cathode ray tube.

Horizontal pulses 46 and vertical pulses 44 are necessary for positioning this display. The output of the character generator is passed through the resistor 46, switches the transistor 47, conducts the transistor 47 while the character is appearing, and connects the diodes 49, 60.
．． The bases of transistors 22, 23, and 24 are pulled in through 61'i, and the transistors 22, 23, and 24 are turned off, and all parts of the cathode tube 28 where letters appear are blanked. Further, the output of the character generator 43 is passed through the resistor 52 to switch the transistor 48, making the transistor 48 conductive while a character appears, driving the green cathode of the cathode ray tube 28, and producing green characters on the cathode ray tube 28. The reason for blanking the text part is to cut off the video signal between the lines and make the text easier to read.

The carrier wave component of the intermediate frequency detected (i3-) is added to the positive terminal of the comparator 41, and a reference voltage of 1 t is applied to the negative terminal.The reference voltage is the voltage applied to the positive terminal of the comparator 41. The voltage is selected to be higher than the reference voltage when the optimum tuning point is near.The output of the comparator 41 is connected to the input terminal of the microcomputer 42.
JO, information on whether it is near the matching point or not i ” 1
” and “o” signals. Frequency discrimination circuit 32ba1
The 1IHi is based on a color television receiver, which plays a role in the circuit that manually inputs the gray image intermediate frequency signal, performs frf FM detection, and generates the AFT voltage necessary for AFT operation. This output voltage is 0 (0) at the comparator 36, 3 terminal), and the negative terminal i of the comparator 36 is
'(J8V',=+4) A reference voltage Q is placed at the negative terminal of the comparator 37.Comparator 36
, 37 are applied to the microcomputer 420 input terminal.

By doing so, information as to whether the AFC voltage is 0 to 4V, 4 to 8V, or 8V or more can be transmitted to the microcomputer 42 using the signals 'i'1' and 'O'.

FIG. 4 shows a signal sent to the microcomputer 42 near the tuning point and an input signal to each comparator for generating the signal, with frequency plotted on the horizontal axis. Region C is the optimum tuning point, a and b are lower regions, d,
e is an area higher than that. G is comparator 41
The voltage applied to the positive terminal of , the broken line is the reference voltage applied to the negative terminal, H is the output voltage of comparator 41, IU
) 7 Fr voltage applied to the positive terminal of the comparator 36, 37, where the upper broken line is the reference voltage applied to the negative terminal of the comparator 36, and the lower broken line is the reference voltage applied to the negative terminal of the comparator 37. .

Further, J is the output voltage of the comparator 36, and K is the output voltage of the comparator 37. From this figure, the information of the a~e@ area tb is H, J, and the first signal is "1" and '0'°.
The information is transmitted to the microcomputer 42 as shown in the table.

Based on this information, the microcomputer 42 controls the character generator 43 to change the characters to be displayed on the cathode ray tube 28G'. 1 of the display characters for each input information
1 & 14 are as shown in Table 2, for example.

One mark 1L indicates that either "1" or 0 is acceptable. It can be easily understood from Tables 1 and 2 that the characters displayed in each area of the first garment are as shown in Table 3.

In this device, the synchronization state is not only displayed in letters, but also when in area d, the microcomputer 42 fully controls the character generator 43 to change the display position of the characters, and when in area b, it moves to the right. , d area, the display position of the characters is moved to the left at a constant speed so that even people who cannot read the characters can understand the direction in which the tuning knob should be turned all the way.

FIG. 5 shows examples of characters displayed in each area of FIG. 4 a to e.

(a) Characters projected on the cathode ray tube in areas a and e,
(B) is an example of display characters in the b area, (c) is in the C area, and (b) is in the 61-term area.

Figure 6 shows a display 1772 of characters moved by this device.
Two examples are shown in Figure 4 as the full range. Frame (shi) Hatere and the bottom of the screen! '511 k shown 1. Arrows indicate the passage of time. 1 I indicates that the characters ['TUl'LN・RIGHT] appear at the left end V (after which the display position gradually moves to the right, disappears to the right end, and then appears from the left end.

In this example, I moved it to the right when I should have turned it to the right, but
Conversely, you may move it to the left, and instruct the user to turn it in the direction to stop the movement, that is, to the right.

In addition, in this example, it is assumed that the tuning knob will be rotated to tune the [-T'U)(,N-Ri GHT
I used all the letters J, j'TU, uN-LEFTJ, but for a system that operates in synchronization with up or down home, ['UP/~VARDJ,)'DOWN]
・ν'v'ARD J Q, use appropriate letters of B,
It may also be moved in the vertical direction.

Although the above embodiment has been explained using alphabets, it is also possible to use Japanese or other characters.

Effects of the Invention As described above, according to the present invention, a signal detected by FM using a video intermediate signal frequency discrimination circuit is input to a microcomputer, a character display device is connected to the microcomputer, and a character display device is connected to the microcomputer, and The displayed characters are moved up and down or left and right, and the direction of movement indicates the direction in which the synchronization operation should be performed.Not only does it make synchronization work easier, but the movement of the characters also makes it clear that there is an abnormal condition. It is possible to realize all devices with good operability.

[Brief explanation of drawings]

FIG. 1 is an electrical diagram of a conventional tuning display device for a color television receiver, FIG. 2 is a signal waveform diagram of the main parts of FIG. 1, and FIG. 3 is a tuning diagram of an embodiment of the present invention. The electrical wiring diagram of the display device, Figure 4 shows the relationship between frequency and voltage near the tuning point of the main parts of the device in Figure 3? Figure 5
FIG. 6 is a front view showing an example of a display screen in the same device. 22-24 -- Cathode ray tube drive transistor, 1
4 to 16...Comparator, 16...AND gate, 4...Carrier amplification transistor, 7...Detection diode, 19...-Sawtooth wave generation transistor , A...Transistor 1
9 collector waveform, B...Transistor 10 collector waveform, C...Transistor 10 emitter waveform, D...Comparator 16 output waveform, E...
River/comparator 14 output waveform, F...AND gate 16 output waveform, 42...Microcomputer, 43...Character display device, 36-37...
... Comparator, 41 ... Comparator, 32
...Frequency discrimination circuit, 47...Blanking transistor, 48...Drive transistor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A color television receiver is equipped with a character display device for displaying characters on a cathode ray tube, and a signal obtained by FM detection of a video intermediate frequency signal by a frequency discrimination circuit is used to control the character display device. A synchronization display device in which display characters are moved up and down or left and right according to the synchronization state, and the direction in which the synchronization operation should be performed is indicated by the direction of movement.