JPS6014559B2 - television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is designed to display a screen for easy confirmation when adjustment points that do not depend on the viewer's preferences, such as the local frequency, horizontal synchronization, and vertical synchronization of a television receiver, are out of alignment. This is related to the equipment that was used for this purpose.

A typical television receiver has brightness, contrast,
There is an adjustment circuit that allows adjustment of image quality, volume, sound quality, color saturation, hue adjustment, etc. according to the so-called viewer's preference, and on the other hand, there is an adjustment circuit that allows adjustment of image quality, volume, sound quality, color saturation, hue adjustment, etc. according to the viewer's preference. There are two types of adjustment points: adjustment circuits installed to respond to environmental changes such as changes in the age of receivers on the manufacturer's side. Moreover, the local, horizontal synchronization, and vertical synchronization adjustment knobs, which are unnecessary for viewers, are placed in locations where viewers can easily touch them, such as on the side of the receiver, for ease of service. For example, when a child or an adult accidentally touches such an adjustment part, there are generally few people who are able to adjust it to the normal state due to their inexperience with the adjustment, and for this reason, a person at an electronics store is called in. The current situation is that we have to call.
Furthermore, although it is possible to store such adjustment points within the receiver, if they actually become misaligned due to aging, etc., the hair plate must be opened each time, which impairs serviceability. Also, it is not possible for the general public to open the back plate and make adjustments.
This can lead to more and more adjustment errors, and it can also be very dangerous from a safety standpoint. In addition, even people who are quite accustomed to adjusting local, horizontal synchronization, and vertical synchronization may experience symptoms of synchronization being disrupted due to local misalignment, or conversely,
When it comes to determining symptoms where synchronization is disrupted and locals appear to be out of sync, it becomes extremely difficult to make complete adjustments. The present invention eliminates such drawbacks of the conventional art, and provides a display device in which even the general public can see at a glance which adjustment point is out of place when an adjustment point that does not depend on the viewer's preference, such as local horizontal or vertical synchronization, is out of alignment. In addition, it is an object of the present invention to provide a display blind pupil that uses a cathode ray tube screen of a television receiver to display without using any special diamond pupil or parts as a display object.

A specific embodiment of the present invention is shown in FIG. 1 and will be explained.

1 is an antenna, 2 is a tuner, 3 is a local adjustment knob for adjusting the local oscillation frequency (local frequency) of the tuner to obtain a regular intermediate frequency, 4 is an intermediate frequency booster circuit, 5 is a video detection circuit, 6 is a video intensifier, 7 is a cathode ray tube, 8 is a sync signal separation circuit, 9 is an integration circuit for obtaining a vertical sync signal, 10 is a vertical oscillation circuit, 11 is a vertical signal intensifier circuit (vertical sawtooth wave intensifier circuit) , 12 is a vertical output circuit, and 13 is a vertical synchronization volume for adjusting the oscillation frequency of the vertical oscillator.

18 is a differentiation circuit for obtaining a horizontal synchronization signal, 19 is a horizontal phase detection circuit, 20 is a horizontal oscillation circuit, 21 is a horizontal output drive circuit, 22 is a horizontal output circuit, and 23 is a horizontal oscillation frequency adjustment volume.

Since the circuits with the above functions are the basic circuits of a general television receiver, a description of their operation will be omitted. 14, 15, 16, 17
14 is a display circuit for adjusting the vertical synchronization knob when the vertical oscillation frequency is shifted and synchronization is flowing on the screen. First, 14 detects whether the vertical oscillation frequency matches the vertical synchronization signal. The outputs of the integrating circuit 9 and the vertical oscillation circuit 10 are added as inputs.

The output of the gate circuit 14 is converted to D by 16 smoothing circuits 15.
It is converted into a DC voltage, and appears as a DC voltage depending on whether the outputs of the integrating circuit 9 and the vertical oscillation circuit 10 are in phase or out of phase. A switching circuit 16 is turned on or off depending on the output of the smoothing circuit 15.The switching circuit 1-6 controls the display circuit 17, and when the integration circuit 9 and the vertical oscillation circuit 10 are in phase, the switching circuit 16 is turned on or off depending on the output of the smoothing circuit 15. Therefore, the display circuit 17 is set not to operate, and when the phase is out of phase, the display circuit 17 is set to operate.

In this way, if the vertical synchronization is disturbed for some reason, even a general viewer can understand at a glance by the operation of the display circuit 17 that all he has to do is adjust the vertical synchronization knob. 24, 25, and 26 are display circuits when the horizontal synchronization is disturbed, and this also uses the output of the differentiating circuit 18 and the horizontal output circuit 2.
The phase of the horizontal synchronizing signal and the horizontal oscillation pulse is detected by the phase detection circuit 24 from the output of be. 28, 29, 30, 3
Reference numeral 1 denotes a display circuit for when the local frequency is shifted, and 28 is a singly tuned carrier multiplier tuned to the intermediate frequency, the output of which changes depending on the state of tuning, that is, the state of local shift.

Reference numeral 29 is a smoothing circuit, 30 is a switching circuit, and 31 is a display circuit, which automatically operate when the local position shifts.

FIG. 2 shows the parts 10 and 14 to 16 in FIG. 1 in a concrete circuit.

FIG. 3 shows voltage waveforms at various parts for explaining FIG. 2. In FIG. 2, numerals 32 to 38 indicate the vertical oscillator portion of FIG. 10. The operation of the oscillator is well known, so it will be omitted, but the base of 37 is connected to the capacitor 32 through the capacitor 32.
When the vertical synchronizing signal shown in FIG. 3 is applied, the oscillation output becomes a sawtooth wave as shown in FIG. This output waveform passes through an emitter follower circuit consisting of a transistor 44 and a resistor 45, and the output is divided by resistors 45 and 47 and applied to the base of a transistor 48. A vertical synchronizing signal is applied to the base of transistor 49 through capacitor 39 and transistor 42 . The transistors 48 and 49 constitute a gate circuit, and the transistor 48 turns on at the level 1 of the waveform shown in FIG. flows and turns on transistor 51. Therefore, the pulse shown in FIG. 3c appears at the collector of transistor 51 only when both signals are synchronous.

From this waveform, the smooth waveform shown in FIG. 3d is obtained by an RC integrating circuit including a resistor 52 and a capacitor 50. This is applied to the base of the switching transistor 40 through an emitter follower circuit of transistors 43 and 41.
Therefore, the transistor 40 is turned on when the phases are the same, and turned off when the phases are different. The collector of the transistor 40 is an eighth transistor, which will be described later.
It is connected to a shown in the figure and controls the display circuit 17. FIG. 4 shows specific circuits of portions 19, 20 and 24 to 27 in FIG. FIG. 6 shows waveforms of various parts of FIG. 4. Figure 5a
is the horizontal synchronization signal, b is the horizontal flyback pulse,
are applied to the bases of transistor 54 and transistor 53, respectively. This portion of the circuit has the same circuit configuration as that in FIG. 2, so a description thereof will be omitted. When the horizontal synchronization signal (a) in FIG. 5 and the horizontal flyback pulse (b) in FIG. Connected to the terminal. FIG. 6 shows specific circuits 28 to 30 in FIG. 1.
55 is an amplifier circuit having a tuning circuit tuned to the video intermediate frequency (58.79M).

The output of this increasing circuit is connected to a diode 56 and a capacitor 57.
When smoothing is performed, a DC voltage that changes as shown in FIG. 7a is obtained at the output of the emitter follower circuit consisting of the transistor 58 and the resistor 59 with respect to the shift in the video intermediate frequency. If the setting is made so that the transistor 60 is turned on when this DC voltage exceeds the level indicated by 14 in FIG. The collector of this transistor 60 is connected to the terminal c in Fig. 8, which will be described later. Fig. 8 shows a circuit showing the so-called display parts 17, 27, and 31 in Fig. 1. shows.

This display circuit is capable of displaying characters on the cathode ray tube surface of a television receiver, so that when a local shift or synchronization shift occurs, it is immediately possible to see which part of the adjustment has shifted. In FIG. 8, numeral 61 is a clock pulse generation circuit which applies a horizontal flyback pulse as a trigger signal. The oscillation frequency of the clock pulse generation circuit 61 varies depending on the number of dots to be displayed, but is generally 3.
~This is Ogawa Z. Reference numerals 62, 63, and 64 designate character signal generation circuits consisting of a combination of a flip gate circuit and a shift register circuit for generating character signals.

A vertical flyback pulse is applied to each character signal generating circuit to determine the timing of the start of a character. These character signal generating circuits 62, 63, and 64 can be constructed using the same means as the circuits normally used when inserting characters into general video at broadcasting stations, so the detailed circuits will be omitted. 65,6
6 and 67 are switching circuits, and 65 is controlled by the transistor 40 in FIG.

66 is a transistor 68 shown in FIG. 4, and 67 is controlled by a transistor 60 shown in FIG.

69 is a mixer, and switching circuits 65, 66, 6
The output signals of 7 are collected and applied from the output of mixer 69 to a video intensifier circuit (not shown) of the television receiver.

For example, the character signal shown in FIG. 9 is generated by the character signal generation circuit 62. When the vertical synchronization is disturbed, the switching circuit 65 is controlled by the transistor 40 shown in FIG.
The signal passes through the mixer 69 and is added to the video intensifier circuit, whereupon a character indicating the vertical synchronization error appears on the screen. Viewers can easily adjust the vertical sync volume by looking at the text. Once adjusted and synchronized, the text will disappear automatically. Horizontal synchronization deviation and local deviation also occur in the same way, and the characters b and a in FIG. 9 appear on the screen. The character signal does not use a synchronization signal as a trigger signal, but uses horizontal and vertical flyback pulses, so even if the synchronization is disrupted, the characters will not be disrupted. In addition, although Fig. 8 shows the case where a character signal is added to a video intensifier, in the case of a color receiver, by adding a character signal to a color signal circuit (for example, a color difference signal intensifier), the character signal can be displayed simultaneously with a character signal. It can also be easily displayed. FIG. 10 shows an attempt to use the cathode ray tube of a television receiver to display graphics and colors on the screen when local deviations or synchronization deviations occur.

First, in FIG. 10, a vertical flyback pulse as shown in FIG. 11a is applied to the base of the transistor 70. This pulse can be taken out, for example, from the vertical output circuit 12 of FIG. This pulse is made into a sawtooth wave by a resistor 71 and a capacitor 72 as shown in FIG. 11b, and is applied to a sardine intensifier 73. A sawtooth wave shown by the broken line in FIG. 11c is obtained at the collector of the transistor 74 of the multiplier 73, and a sawtooth wave shown by the solid line in FIG. 11c is obtained at the collector of the transistor 75. The output of this transistor 74 is connected to the resistor 76
and 77 and added to the base of transistor 78.
The collector output of transistor 75 is divided by resistors 79 and 80 and applied to the base of transistor 81. Transistors 78 and 81 constitute a gate circuit, and if each transistor operates at a level corresponding to level 15 of the output waveform shown in FIG. A positive pulse appears. This world power is applied to the base of transistor 85 through resistor 83, and the emitter follower output formed by transistor 85 and resistor 86 is applied to the input of the receiver's R-Y color difference signal amplification circuit (not shown). Therefore, when the transistor 40 in Fig. 2 is off, that is, when the vertical oscillation output is out of phase with the vertical synchronization signal, a horizontal red band as shown in Fig. 13a appears on the screen. appear. When the phase is the same, the transistor 40 is on, so no pulse appears at the emitter of the transistor 85.When the phase is different, the image on the screen is out of synchronization, but the 12th
Since the figure shown in Figure a uses the vertical flyback pulse as a source signal, this figure is not disturbed. A horizontal flyback pulse is applied to the transistor 87 in FIG. 10, and the subsequent circuitry is the same as the upper part of FIG. 10, so a description thereof will be omitted. This circuit also has a transistor 88
Since the collector shown in FIG. 4 68 is connected to the intersection of the base and the resistor 89, if the horizontal synchronization is disturbed, a blue band in the vertical direction as shown in FIG. 12b appears on the screen. Transistors 89 and 90 constitute a gate circuit, and inputs include the collector output of transistor 78 through resistor 91 and the collector output of transistor 93 through resistor 92. Therefore, as shown in FIG. 12c, this gate output appears only at the common portion between a and b in the same figure. At the intersection of the resistor 74 and the base of the transistor 95, the collector of the transistor 56 shown in FIG.
A border window as shown in Figure c will appear. As described above, according to the present invention, adjustment parts that do not depend on human preference, such as local frequency deviation, vertical synchronization deviation, horizontal synchronization deviation, etc., are When a misalignment occurs due to a child's mischief, etc., it is possible to easily know which adjustment point is misaligned by displaying the different shapes on the cathode ray tube screen.

Therefore, the user will not be bothered by the misalignment of the adjustment part, and the user can easily adjust the adjustment part by himself/herself. Also, by using the cathode ray tube of the television receiver to display the display on the screen without using display lamps, etc., it is more advantageous than using lamps in terms of increased costs and failures. .

[Brief Description of the Drawings] Fig. 1 is a block diagram of a television receiver according to an embodiment of the present invention, Fig. 2 is a circuit diagram of a part of the same receiver,
Figures 3 a, b, c, d, e, and f are waveform diagrams for explaining the circuit, Figure 4 is a circuit diagram of other parts of the receiver, and Figure 5 a.
, b, c, d'e'f are waveform diagrams for explaining the circuit, FIG. 6 is a circuit diagram of other parts of the same receiver, and FIG. 7 a,
b is a waveform diagram for explaining the circuit, FIG. 8 is a block diagram of other parts of the receiver, FIGS. 9 a, b, and c are plan views of the screen of the receiver, and FIG. A specific circuit diagram of a part of another embodiment of the same receiver, Fig. 11 a, b, c, and d are waveform diagrams for explaining the same circuit, and Fig. 12 a, b, and c are the screen of the same receiver. FIG. 9... Integration circuit, 10... Vertical oscillation circuit, 14... Gate circuit, 15, 25.29... Smoothing circuit, 16, 26, 30... Switching roundabout,
17, 27, 31...display circuit, 18...differentiation circuit, 1
9...Horizontal phase detection circuit, 24...Phase detection circuit, 61...Clock pulse generation circuit 62,6
3, 64...Character signal generation circuit, 65, 66, 67
...Switching circuit, 69...Mixing circuit. Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 Figure 4 Figure 7 Figure 8 Figure 9 Figure 12 Figure 10 Figure 11

Claims (1)

[Claims] 1. A vertical oscillation circuit that oscillates in synchronization with a vertical synchronization signal separated from a television signal, a vertical synchronization volume for adjusting the oscillation frequency of the vertical oscillation circuit, and input of the vertical synchronization signal and vertical oscillation signal. and a first detection means for detecting whether or not the phases of the two signals match, and a vertical synchronization deviation is displayed by the detection output of the first detection means when the phases of the two signals match. control means for controlling the supply of the vertical synchronization shift display signal to the cathode ray tube by cutting off the supply of the signal for displaying the vertical synchronization shift to the cathode ray tube, and supplying the signal for displaying vertical synchronization shift to the cathode ray tube based on the detection output when the two signals are out of phase; A horizontal oscillation circuit that oscillates in synchronization with a horizontal synchronization signal separated from the signal, a horizontal synchronization volume for adjusting the oscillation frequency of the horizontal oscillation circuit, and a horizontal synchronization volume that inputs the horizontal synchronization signal and horizontal flyback pulse. A second detection means detects whether the phases of the signals match or not, and a horizontal synchronization deviation display signal is generated by the detection output of the second detection means in a state where the phases of the two signals match. control means for controlling the supply of the signal to the cathode ray tube and supplying the horizontal synchronization display signal to the cathode ray tube based on a detection output when the phase of both signals is shifted; and a control means tuned to the video intermediate frequency. and a local deviation detecting means comprising a tuning circuit that cuts off the supply of the local deviation display signal to the cathode ray tube using the detection output of the local deviation detecting means in a state where the video intermediate frequency is tuned to the tuning circuit; control means for controlling the local shift display signal to be supplied to the cathode ray tube based on the detection output when the signal phase shifts, and the control means controls to supply the local shift display signal to the cathode ray tube, and displays each shift display signal in different forms on the cathode ray tube screen. A television receiver characterized in that the television receiver is configured to display images on the screen.