KR890005238B1 - Tunning display apparatus - Google Patents

Abstract

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Description

Sync display

1 is a circuit diagram of a conventional tuning display.

2 is a signal waveform diagram in the main part of FIG.

3 is a circuit diagram of one embodiment of the present invention.

4 is a diagram showing a display state of a screen when the tuning state in one embodiment of the present invention is not optimal.

FIG. 5 is a diagram showing the display when the tuning condition of FIG. 4 is optimal; FIG.

6 is a circuit diagram showing another embodiment of the present invention.

7 is an input / output voltage waveform diagram of each comparator of FIG.

8 shows an example of tuning display by the apparatus of FIG.

9 is a circuit diagram showing a third embodiment of the present invention.

FIG. 10 shows an example of a tuning indicator by the apparatus of FIG.

* Explanation of symbols for main parts of the drawings

4: carrier amplifier transistor 7: rectifier diode

12, 14, 47, 63, 64: comparator 16: sawtooth wave generation transistor

20: AND gate 21, 37: transistor for green cathode drive

22, 43: transistor for red cathode drive

23: transistor for blue cathode drive

30: cathode ray tube 32, 60: character generator

33, 61, 71: microcomputer 34: character output terminal

35: background output terminal 39: video signal blanking transistor

42: background output control transistor 52: switching transistor

54: Character 55, 55 ': Background

62: frequency discrimination circuit

The present invention relates to a tuning display for displaying a tuning state on a screen of a cathode ray tube of a color television receiver.

The tuning display device in the conventional color television receiver was constructed as shown in FIG. In Fig. 1, reference numeral 1 denotes a capacitor, and one end of the video intermediate frequency signal a is supplied.

The other end of the capacitor 1 is connected with the bias setting resistors 2 and 3 and the base of the carrier amplifier transistor 4. Denoted at 4 is a carrier amplifier, the emitter is grounded, and the collector is connected to the power supply + B via the coil 5 and the capacitor 6 connected in parallel with each other.

After the anode of the rectifying diode 7 is connected to the middle tab of the coil 5, the cathode is connected to the other end of the smoothing capacitor 8 having one end grounded, and then through the resistor 9. It is connected to the base of the transistor 10. The emitter of the transistor 10 is grounded via a resistor 11 and connected to the negative input terminal of the transistor 12, and the collector is connected to a power supply (+ B) via a resistor 13 and simultaneously the comparator 14 Is connected to the positive input terminal. The emitter and collector of the transistor 10 are connected to each other via a resistor 15. On the other hand, reference numeral 16 denotes a sawtooth wave generating transistor, and a positive horizontal flyback pulse b is supplied to the base via a resistor 17. The emitter of the sawtooth generator transistor 16 is grounded, the collector is connected to the power supply (+ B) via the resistor 18, and grounded via the capacitor 19, and the positive input of the comparator 12 The terminal and the negative input terminal of the comparator 14 are connected. Each output terminal of the comparators 12 and 14 is connected to the input terminal of the logical product gate 20, respectively. 21 is a green cathode drive transistor, 22 is a red cathode drive transistor, 23 is a blue cathode drive transistor, and green, red and blue video signals c) and d are formed at respective bases. And (e) are respectively supplied. Each emitter of each of the drive transistors 21, 22, 23 is grounded via resistors 24, 25, and 26, respectively, and each collector is respectively a resistor 27, 28, and It is connected to the power supply (+ B) via (29) and is connected to the green cathode, the red cathode, and the blue cathode of the cathode ray tube 30, respectively. The output terminal of the AND gate 20 is connected to the base of the green cathode drive transistor 21 via the diode 31.

Next, the operation of this embodiment will be described with reference to FIG. The image intermediate frequency signal a applied to one end of the condenser 1 is amplified by the carrier amplifying transistor 4 and at the same time the coil 5 is selected to resonate with the frequency of the carrier component of the image intermediate frequency signal a. The carrier component is taken out by the condenser 6. The carrier component is detected by the rectifying diode 7 and the smoothing capacitor 8 as detection means and taken out as a DC voltage, and the voltage is the highest at the optimum tuning point. When this DC voltage is applied to the base of the transistor 10 via the resistor 9, the emitter voltage f of the transistor 10 becomes high as the base voltage is increased, and the collector voltage g is high in the base voltage. Lowers the ground On the other hand, the horizontal flyback pulse b applied to one end of the resistor 17 is converted into a sawtooth voltage h by the sawtooth wave generating transistor 16, the resistor 18, and the capacitor 19. The emitter voltage f of the transistor 10 is input to the negative input terminal of the comparator 12, and the sawtooth wave voltage h is input to the plus input terminal. In addition, the collector voltage g of the transistor 10 is input to the positive input terminal of the comparator 14, and the sawtooth wave voltage h is input to the negative input terminal, so that the output voltage of each of the comparators 12 and 14 is reduced. Pulsed output voltages (i) and (j) are output as shown in FIG. The output voltages i and j are inputted to the AND gate 20, so that the output voltage k in the form of a pulse as shown in FIG. Also, as is apparent from FIG. 2, when the tuned state is close to the optimum tuning point, the emitter voltage f of the transistor 10 rises, and the collector voltage g falls, The pulse width of the output voltage k becomes narrow. In this way, the output voltage k of the logical product gate 20 whose pulse width changes in accordance with the tuning state is supplied to the base of the green cathode drive transistor 21 via the diode 31, and the green video signal The mixture is input to the cathode ray tube 30. Here, the output voltage k of the logical product gate 20 is a pulse signal synchronized with the horizontal scan, and thus the image of television broadcast is displayed on the screen of the cathode ray tube 30 as a vertical green strip of width corresponding to the pulse width. It is reflected with. Therefore, the width of this green strip changes in accordance with the tuning condition, and becomes the narrowest at the optimum tuning point.

However, the above conventional example has the following drawbacks. First, the green band is difficult to see depending on the image of the television broadcast reflected on the screen, and it is difficult to judge the width thereof. Secondly, the user cannot judge the optimal condition only by looking at the green band on the screen, and operate the adjustment knob of the color television receiver to change the tuning state without changing the width of the green band. The problem is that the state of synchronization is not clearly known. For this reason, even though the tuning condition is optimal, the user has made an unnecessary operation of operating the adjusting knob to check the tuning condition and deviating the tuning condition from the optimum tuning point once again to set the optimum tuning point again.

SUMMARY OF THE INVENTION The present invention has been made in view of the drawbacks of the above-described prior art, and provides a tuning display device that is easy to see on the screen and that can determine whether the tuning is optimal even by viewing the screen.

In order to achieve the above object, the present invention provides a predetermined area around a character output signal and a character output signal representing a character or a figure on a screen of a display device using a cathode ray tube for displaying an image based on an input television signal. A character generating means for generating a background output signal representing a background surrounded by a signal, a detecting means for detecting a carrier component from an input image intermediate frequency signal, and generating a detection output according to the tuning intensity, a detection output from the detecting means, A comparison means for inputting a reference signal and comparing the detection output with the reference signal to generate a comparison output according to the illumination intensity; and a comparison output from the comparison means as input, wherein the detection output level is smaller than the reference signal level. The background output outputted from the character generating means when a comparison output to be displayed is inputted The character generating means is controlled to display a part of the background as a first color and a part of a second color as a second arc, and when a comparison output indicating that the detection output level is equal to or greater than a reference signal level is inputted. And a control means for controlling the character generating means to be displayed as one of the first and second colors as the background output signal.

Moreover, in order to make it easier to understand, the position of a character or a figure is changed and it moves to the left and right, and the user can immediately know the direction which should be operated.

In order to make it easier to understand, the FM signal detected by the frequency discriminating circuit is taken out to determine whether the intermediate frequency signal deviates from the optimum tuning point to the high side or the low side. It even changed the type of characters or figures.

EMBODIMENT OF THE INVENTION Hereinafter, an Example demonstrates this invention in detail by drawing. 3 is a diagram showing the configuration of the first embodiment of the present invention, in which the same reference numerals as those in FIG. In Fig. 3, reference numeral 32 denotes a character generating means, that is, a character generating device, to which a control microcomputer 33 is connected. The character generating device 32 has a horizontal flyback pulse b and a vertical pulse l, and has a character output terminal 34 for outputting a character output signal in a positive pulse shape for displaying characters; A background output terminal 35 for outputting a background pulse signal having a positive polarity for displaying a background is provided. The character output terminal 34 of the character generator 32 is connected to the green cathode drive transistor 21 and the other green cathode drive transistor 37 in which the emitter and the collector are common via a resistor 36. Is connected to the base. On the other hand, the background output terminal 35 of the character generator 32 is connected to the base of the video signal blanking transistor 39 whose emitter is grounded via a resistor 38. In addition, the background output terminal 35 is connected to the output terminal of the logical multiplication gate 20 via the resistor 40, and then the emitter is grounded, and the base is connected via the resistor 41. The collector of the transistor 42, the transistor 22 for red cathode drive, the emitter, and the collector are connected to the base of another red cathode drive transistor 43 in common. In addition, the collectors of the image signal blanking transistor 39 include diodes 44 and 45 whose respective anodes are connected to the bases of the green, red and blue cathode drive transistors 21, 22 and 23, respectively. Each cathode of 46 is connected in common. Reference numeral 47 denotes a comparator for optimum tuning point discrimination, the positive input terminal of which is connected to the cathode of the diode 7, and the negative input terminal of which is connected to the center terminal of the variable resistor 48 for setting the reference voltage. have.

One end of the variable resistor 48 is connected to the power supply (+ B) via a resistor 49, and the other end is grounded through a resistor 50. The output terminal of the comparator 47 is connected to the base of the switching transistor 52 whose emitter is grounded via the resistor 51. The collector of the switching transistor 52 is connected to the base of the background output control transistor 42.

Next, the operation of this embodiment will be described with reference to FIG. 4 and FIG. The character generator 32 is controlled by the microcomputer 33 and is positioned at a predetermined position on the screen 53 of the cathode ray tube 30 on which the video of television broadcasting is projected as shown in FIG. For example, a character output signal and a background output from the character output terminal 34 and the background output terminal 35 to display a character 54 such as "JUST" and a background 55 surrounding the character 54 in a square shape, respectively. The signal is output. Here, the horizontal flyback pulses b and the vertical pulses 1 input to the character generator 32 are used to set the display positions of the character 54 and the background 55. The character output signal outputted from the character output terminal 34 drives the green cathode drive transistor 37 via the resistor 36, and displays the green text "JUST" on the screen 53 as shown in FIG. (54). The background output signal outputted from the background output terminal 35 drives the red cathode drive transistor 43 via the resistor 40 to surround the screen 53 with a green character as shown in FIG. The background 55 is displayed in red, and the video signal blanking transistor 39 is turned on via the resistor 38 to blank the video signal while the background output signal is being output.

At this time, the comparator 47, that is, the comparator 47 for determining the optimum tuning point, is supplied with the reference voltage set by the variable resistor 48 to its negative input terminal, and the image intermediate frequency signal from the diode 7 is supplied to the positive input terminal. The signal corresponding to the amplification and detection of the tuning intensity obtained from the carrier component is supplied from the carrier component. The reference voltage is set so that the output becomes "high level" at the optimum tuning point. Therefore, when the tuning state is not optimal, since the "low level" is output from the comparator 47 and the switching transistor 52 is cut off, the output voltage k of the pulse shape from the logical multiplication gate 20 is prevented. The background output control transistor 42 repeats the conduction and interruption, and interrupts the background output signal only while the pulse of the output voltage k of the logical multiplication gate 20 comes out, and as shown in FIG. A portion of the background 55 is replaced with a black background 55 'to be displayed. Since the width of the black background 55 'is proportional to the pulse width of the output voltage k of the logical product gate 20, when the tuning state is far from the optimum tuning point, the width is wide, and the closer the optimum tuning point is, the closer the optimal tuning point is. Narrows. Further, even when the width of the black background 55 'is widest, the width of the red background 55 is set so as not to exceed the red background 55. When the optimum tuning point is reached, the output of the comparator 47 for determining the optimum tuning point becomes " high level " and the switching transistor 52 is turned on to cut off the background output control transistor 42. For this reason, the red cathode drive transistor 43 is driven by the supplied background output signal without being cut off from the background output terminal 35 of the character generator 32, so that the black portion as shown in FIG. A complete red background 55 is displayed. In addition, this display operation is applied to the microcomputer 33 at the time of the tuning operation to perform the display operation.

In this manner, when the tuning condition is not optimal, a part of the red background 55 is replaced with the black background 55 'at a width corresponding to the tuning degree, and when the optimum tuning point is reached, the red background 55' is displayed. ) Is displayed in a complete form, so that the user can accurately determine the state of synchronization simply by looking at the display. In addition, although the color of the actual character 54 is green in a black part, when a background is red, green and red are mixed and appear as a yellow character.

In the above embodiment, although the display is performed by the characters and the background, the figures may be displayed instead of the characters, and the synchronized state may be displayed by the figures and the background.

6 shows a second embodiment of the present invention. In FIG. 6, the same code | symbol as FIG. 3 shows the same thing. The apparatus shown in Fig. 6 extracts the FM-detected signal by the frequency discrimination circuit, and determines whether the signal is out of the optimum tuning point higher or lower by using the frequency discrimination circuit, so that the character or figure in the background To change the type of.

6 will be described. In Fig. 6, reference numeral 60 denotes a character generator, and 61 denotes control means for controlling the character generator 60, that is, a microcomputer. The positive terminal of the comparator 47 is connected to the negative electrode of the diode 7, and the negative terminal is connected to the center terminal of the volume 48 for setting the reference voltage. The output of the comparator 47 is connected to the input terminal of the microcomputer 61. Reference numeral 62 denotes a frequency discrimination circuit, in which an input terminal is connected to an image intermediate frequency amplifier circuit (not shown), and an output terminal is connected to an AFT terminal of a tuner (not shown) to perform an AFT operation and at the same time a comparator 63 ( Also connected to each positive terminal of 64). This voltage is called the AFT voltage, and is usually between 0 and 12V, and becomes 6V at the optimum tuning point. To the negative terminal of the comparator 63 and the negative terminal of the comparator 64, resistors 65, 66, 67 are connected in series from the power supply to the ground in order to give a reference voltage. The intersection with 66 is connected to the negative terminal of the comparator 63 and the intersection between the resistors 66 and 67 is connected to the negative terminal of the comparator 64. The reference voltages of the comparators 63 and 64 obtained in this way are set to about 8V for the comparator 63 higher than 6V and to 4V for the comparator 64 lower than 6V.

The outputs of the comparators 63 and 64 are connected to the input terminals of the microcomputer 61.

Next, the operation of this circuit will be described. The microcomputer 61 controls the character generator 60 to display characters at predetermined positions on the cathode ray tube 30.

The horizontal pulse b and the vertical pulse l are necessary for positioning of this display. A signal obtained by detecting a carrier component of intermediate frequency is applied to the plus terminal of the comparator 47, and a reference voltage is applied to the minus terminal. The reference voltage is selected to be higher than the reference voltage when the voltage applied to the plus terminal of the comparator 47 is near the optimum tuning point. The output of the comparator 47 is applied to the input terminal of the microcomputer 61, and transmits information of whether or not near the tuning point as a signal of "1" and "0". The frequency discrimination circuit 62 is a circuit for inputting an image intermediate frequency signal, FM detection thereof, and making an AFT voltage necessary for AFT operation, which is provided in a general color television receiver. The output voltage is applied to the positive terminals of the comparators 63 and 64, and a reference voltage of 8 V is applied to the negative terminal of the comparator 63 and 4 V to the negative terminal of the comparator 64. The outputs of the comparators 63 and 64 are applied to the input terminals of the microcomputer 61. In doing so, information on whether the AFT voltage is 0 to 4 V, 4 to 8 V, or 8 V or more can be transmitted to the microcomputer 61 as signals of "1" and "0".

7 shows the signal applied to the microcomputer 61 near the tuning point and the input signal of each of the comparators 47, 63 and 64 for producing the signal at a horizontal axis. Area (c) is the optimum tuning point, (a) and (b) are lower areas, and (d) and (e) are higher areas. (G) is the voltage applied to the positive terminal of the comparator 47, the broken line is the reference voltage applied to the negative terminal, (H) is the output voltage of the comparator 47, (I) is the voltage of the comparator 63, 64 The AFT voltage applied to the positive terminal, where the broken line above is the reference voltage applied to the negative terminal of the comparator 63, and the broken line below is the reference voltage applied to the negative terminal of the comparator 64. (J) is the output voltage of the comparator 63, and (k) is the output voltage of the comparator 64. In this figure, the information of each region (a) to (e) is transmitted to the microcomputer 61 as the first table as signals of "1" and "0" of (H) (J) (K).

[Table 1]

The microcomputer 61 discriminates the signal by means 61a, controls the character generator 60 through the means 61b, and changes the characters to be displayed on the cathode ray tube 30. Display characters for the respective input information are shown in Table 3 as an example.

[Table 2]

(Note)-indicates that either 1 or 0 may be used. It can be easily understood that the display characters in the respective areas of the first table from the first and second tables become like the third table.

[Table 3]

In this way, the user can easily grasp the current state by changing the color of the background 55 and changing the color of the background 55, and when the camera is slightly out of sync, the TV teaches how to turn the tuning knob. easy. In this example, the tuning operation is assumed by the tuning knob. Therefore, the character of "TURN RIGHT" and "TURN LEFT" is written. However, in the case of the polarity system which is operated by the push button of up or down, for example, Use appropriate characters such as "PUSH UP" or "PUSH DOWN". 8 shows an example of characters projected onto the cathode ray tube 30 during the tuning operation according to the present invention. Fig. 8 (a) shows the letter reflecting on the cathode ray tube in the state of (a) (e) in Table 3 when the tuning is completely out of phase, and Fig. 8 (b) shows the state of Table 3 (b), 8 (c) shows the state of the 3rd table (c), and 8 (d) shows the display character in each state of the 3rd table (d). In addition, the deformation at this time changes as shown.

In addition, in the said Example, although demonstrated using the alphabet, even if it uses the Japanese and other characters, it does not interfere. Further, in the above embodiment, the tuned state (TUNED) and the non-tuned state (DETUNED) and the direction to be tuned (TURN, RIGHT, TURN, LEFT) are displayed, but only the characters indicating the tuned state and the non-tuned state are displayed. You may do so. In addition, the display may be represented by a figure instead of a character, and for example, the direction to be synchronized may be displayed by an arrow.

Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 9 shows that the function of the microcomputer means 61 in FIG. 6 is changed to 71. FIG. 6 is different from the character type of the functional block of the microcomputer 71 and the position changing means 71b. For the display character changing means 61b of FIG. 6, this also changes the type and position of the character. I'm trying to. Further, the signal discriminating means 71a performs the same function as the means 61a of FIG. The operation is almost the same as that of FIG. 6, but in the explanation of FIG. 6, when the tuning is out of sync and it needs to be turned to the right, the letters appear as "TURN RIGHT", but this is "TURN RIGHT". The text moves to the right. The shape is shown in FIG. In this figure, only the characters are displayed and the background is omitted. In the above drawing, the time becomes the bottom view over time. In other words, the characters move with the passage of time. According to this instruction, the user only needs to rotate the tuning knob, and when the optimum tuning state is achieved by this operation, the character changes from "TURN RIGHT" or "TURN LEFT" to "TUNED" and changes to the background 55. Black disappears and is unified in red.

As described above, the present invention surrounds a character output signal representing a character or a figure on a screen of a display device using a cathode ray tube displaying an image based on an input television signal, and a predetermined area around the character or figure. Character generating means for generating a background output signal representing the background, Detection means for detecting a carrier component from an input image intermediate frequency signal, and for generating a detection output according to the roughness, Detection output from the detection means and a reference signal A comparison means for making an input and comparing the detection output with a reference signal to generate a comparison output according to the illumination intensity, and a comparison indicating that the detection output level is smaller than the reference signal level by inputting the comparison output from the comparison means. The background output outputted from the character generating means when an output is inputted The character generating means is controlled to display a part of the background as a first color and a part of a second color as a second arc, and when a comparison output indicating that the detection output level is equal to or greater than a reference signal level is inputted. And a control means for controlling the character generating means to be displayed as one of the first and second colors as the background output signal. The display is easy to see, and the user can judge the tuning state accurately just by looking at the display. In addition, it is effective in displaying a trademark or a company name as a letter. In addition, the synchronization state can be displayed more clearly by changing the color and type of the character or figure together with the background color. In addition, by changing the position of the character or figure, and moving from side to side, the user can easily know the direction to operate.

Claims (4)

A character output signal representing a character or a figure on a screen of a display device using a cathode ray tube 30 displaying an image based on an input television signal, and a background output representing a background surrounding the character or figure in a predetermined area. Character generating means (32) and (60) for generating a signal, detection means (7) (8) for detecting a carrier component from an intermediate frequency signal of an input image, and generating a detection output in accordance with the luminance, and the detection means ( 7) a comparison means 47 which inputs a detection output and a reference signal from (8) and compares the detection output and the reference signal to generate a comparison output according to the tuning intensity, and a comparison from the comparison means 47 As a discharge output signal outputted from the character generating means 32 and 60 when a comparison output is inputted with an output as input and indicating that the detection output level is smaller than a reference signal level. The comparison output which controls the character generating means 32 and 60 so that a part of the background is the first color and the other part is the second color, and indicates that the detection output level is equal to or greater than the reference signal level. And a control means (33) (61) (71) for controlling the character generating means (32) (60) so as to be displayed in one of the first or second colors as the background output signal when it is input. A tuning display device, characterized in that. 2. The background (55) of the first color and the background (2) of the second color according to the comparison output level from the comparing means (47) when the detection output level is smaller than the reference signal level. And control means (31) (61) (71) for controlling the character generating means (32) (60) so as to sequentially switch the area ratio of the 55 ') portion. 3. The apparatus according to claim 1 or 2, further comprising control means (61) (71) for controlling the character generating means (60) to switch the contents of both the character output signal and the background output signal in accordance with the comparative output level. A tuning display device characterized by the above-mentioned. The character or figure which shows the operation direction which should operate the tuning adjustment means, such as adjustment knob, in order to become the optimum tuning state according to a comparative output level. And control means (61) (71) for controlling the character generating means (60) to generate a character output signal for the same.

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