JPS5883474A - Television device - Google Patents

Abstract

PURPOSE:To receive signals of different horizontal scanning frequencies, without increasing the number of input terminals and cables, by transmitting a signal to be used for auxiliary deflection to display the signal of the standard system after superimposing the signal on a vertical cynchronizing signal. CONSTITUTION:A TV signal of the standard system is converted into a signal corresponding to a horizontal scanning frequency n-times the frequency at a signal conversion circuit 3 and the horizontal synchronizing signal is converted into a synchronizing signal having the n-times frequency. A horizontal synchronizing signal HD1' is superimposed on a vertical synchronizing signal VD1' obtained at the circuit 3 at a signal superimposing circuit 8 to obtain a new vertical synchronizing signal VD1''. Signals of the standard system obtained at the circuits 3 and 8 are applied to a switching circuit 6. Signals of the different system are supplied to the circuit 6 and either one of the signals is selected and applied to a display section 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a standard television signal and a standard n
The present invention relates to a television device that can receive and display both signals of a second television system having a horizontal scanning frequency that is approximately double that of the second television system.

Current standard television signals, such as NTSC
In this method, the number of images per second is 30, and the number of scanning lines per image is 62.
It has been decided that there will be six. When the number of scanning lines is constant, the density of scanning is high in a relatively small receiver, but as the screen size becomes larger, the spacing between scanning lines becomes wider and individual scanning lines become more noticeable. Especially today, when there is a demand for larger screens, higher resolution broadcasting is required in order to improve the problem of lack of definition.

Therefore, in the near future, the number of scanning lines will increase from 2 to the current standard method.
A high-definition system with about 3 times the bandwidth and 6 to 10 times the bandwidth will be implemented.

For example, from NHK, the number of scanning lines is 1126, the brightness band is 2oMllz,
The number of scanning lines is 1023, and the brightness band is 21.
1 MHz, 1,601 scanning lines, and 50 MflZ in the brightness band are proposed by the BBC. In the transitional period of commercialization of these systems, it would be possible to spread the use of television equipment by creating so-called compatible television equipment, in which receivers that receive signals from these systems can also receive standard television signals. It is thought that it will be faster. by the way,
When attempting to realize a television device having compatibility, a configuration as shown in FIG. 1a can be considered. Input end 1
The standard television signal added to the demodulation circuit 2 is demodulated and applied to the signal conversion circuit 3.

The signal conversion circuit 3 is a patent application filed in 1973 by the same applicant.
5-14120v and Japanese Patent Application No. 141205, it converts the signal obtained by the demodulation circuit 2 into a signal corresponding to n times the horizontal scanning frequency, and converts the horizontal synchronization signal into n times the horizontal scanning frequency. Convert to a synchronization signal with twice the frequency. On the other hand, a second television system signal is applied to the input terminal 4 and demodulated by the demodulation circuit 6. The switching circuit 6 switches the signals from the signal conversion circuit 3 and the demodulation circuit 5 and supplies them to the display section A. The display section 7 includes an amplification circuit, a horizontal deflection circuit, a waveform generation circuit, a vertical deflection circuit, etc., as shown in the above-mentioned Japanese Patent Application No. 141202/1982.

At this time, by configuring the disc tray unit 7 and other circuit parts as separate units and connecting them with cables and connectors, it is possible to create a dedicated second television system as shown in Figure 1. compatibility with the system (as shown in Figure a).
It is convenient because it can be easily shared with systems that have the following. Also, the demodulation circuit 2. Signal conversion time lol! I3. Switching circuit 8
If these are housed in the same housing and the demodulation circuit 6 is separate, or even if these are housed in the same housing, it is advantageous in terms of system sharing if the display section is separate. It is.

Now, at this time, ¥jMji No. 1983-141202.

As shown in Japanese Patent Application No. 141205, when displaying standard system signals, an auxiliary deflection means (Japanese Patent Application No. 56-14) is used to faithfully reproduce the signal and scanning line arrangement to the original signal.
No. 1202 is a waveform generation circuit, patent application No. 14120/1986.
No. 5 requires a signal generation circuit, an amplitude adjustment circuit, and a superimposition circuit). Therefore, when displaying standard system signals, it is necessary to supply a signal for performing the auxiliary deflection operation from the demodulation circuit 2 (or signal conversion circuit v83) to the display unit 7 as shown in FIG. 1a. be. For this reason, it is necessary to increase the number of input signals to the display section, which increases the number of input terminals and the number of signal cables for connection, which becomes an obstacle when sharing the system.

In view of the above points, the present invention realizes system sharing without increasing the number of input signals (number of input terminals).

FIG. 2 shows a block diagram of the present invention. In Figure 2,
The input terminal 1, demodulation circuit 2, signal conversion circuit 3, input terminal 4, demodulation circuit 6, and switching circuit 6 operate in the same manner as in the conventional example shown in FIG. Signal superimposition circuit 8
The operation will be explained with reference to FIG. The signal superimposition circuit 8 is
Vertical synchronization signal VD1' (third
Figure a) Ic, also the horizontal synchronization signal HD1' (Figure 3 b)
This is a circuit that obtains a new vertical synchronizing signal VD1" (Fig. 3 C) by superimposing the vertical synchronizing signal VD1" (Fig. 3 C). and the signal in FIG. 3a. It can also be obtained by inverting a signal obtained by inverting the signal in FIG. 3a (FIG. 3e) and the signal in FIG. 3S (FIG. 3f). In addition, in FIGS. 2 and 3, the horizontal synchronization signal HD1' obtained by the signal conversion circuit 3 and having twice the frequency of the standard horizontal synchronization signal is converted into the vertical synchronization signal vD.
Although the case where the horizontal synchronizing signal HD1 is used as a horizontal synchronizing signal to be superimposed on the demodulating circuit 2 is shown and described above, the same effect can be obtained even if the standard horizontal synchronizing signal HD1 obtained by the demodulating circuit 2 is used.

At δ, the standard system signal obtained by the signal conversion circuit 3 and the signal superimposition circuit 8 is supplied to the switching circuit 6. The switching circuit 6 is also supplied with the second television system signal obtained by the demodulation circuit 6, and is switched by an interlocking switch or relay to send either signal to the display section 70 input terminals 9, 10. Add on 11.12.13.

The display section 7 includes an amplification circuit 14. Picture tube 16° horizontal deflection circuit 16. Deflection yoke 17. Waveform generation circuit 18. Auxiliary deflection circuit 19. Auxiliary coil 24. Waveform shaping circuit 20.
Vertical deflection circuit 21. It is composed of a detection circuit 22, a control means 23, and the like. Signals R2G and B corresponding to the three primary colors supplied to input terminals 9, 10 and 11 are amplified by an amplification circuit 14 and drive a picture tube 16. The horizontal synchronizing signal HD applied to the input terminal 12 is supplied to the horizontal deflection circuit 16 and the waveform generation circuit 18. The horizontal deflection circuit 16 is disclosed in Japanese Patent Application No. 65-14120.
It is equivalent to the horizontal deflection circuit 8 shown in No. 1, and operates at twice the horizontal scanning frequency of the standard system and the horizontal scanning frequency of the second television system, and has a 1:1 deflection yoke. 17. The waveform generation circuit 18 generates a rectangular wave voltage from the horizontal synchronization signal HD, and the auxiliary deflection circuit 1
Supply to 9. FIG. 4 shows the input and output waveforms of the liquid form generating circuit 18. 4A shows the horizontal synchronizing signal HD, and FIG. 4A shows the rectangular wave voltage generated by the waveform generating circuit 18. The waveform generation circuit 18 can be constructed from a flip-flop circuit or the like. The auxiliary deflection circuit 19 amplifies the rectangular wave voltage generated by the waveform generation circuit 18 and drives the auxiliary coil 24 . At this time, the polarity of the rectangular wave voltage is selected to provide a polarity that deflects the vertical scanning signal in the opposite direction, and the magnitude of the rectangular wave voltage is adjusted to the amplitude that is sufficient to move the scanning line by the height of the scanning line interval. are doing.

The auxiliary coil 24 is similar to that shown in FIG. 3 of Japanese Patent Application No. 56-141203, and is attached to the neck of the picture tube 16.

Further, the vertical synchronizing signal (FIG. 3C) applied to the input terminal 13 is transmitted to the waveform shaping circuit 20. The signal is supplied to the detection circuit 22. The waveform shaping circuit 2o is shown in FIG. 6a.

As shown in Fig. 3b, it is constructed by combining an integrating circuit and a jute trigger circuit, or an integrating circuit and a current switch circuit, etc., and integrates and switches the vertical synchronous signal shown in Fig. 3C to generate a vertical synchronous signal shown in Fig. 3C.
The horizontal synchronization signal is removed from the signal, and the vertical synchronization signal shown in FIG. 3a is reproduced.

The vertical synchronization signal obtained by the waveform shaping circuit 20 is supplied to a vertical deflection circuit 21 and a detection circuit 22. Vertical deflection circuit 21
is similar to that used in ordinary television receivers, and drives the deflection yoke 17.

An embodiment of the detection circuit 22 is shown in FIG. 6, and the embodiment shown in FIG. 6 will be explained using the waveform diagram in FIG. The signal having the waveform shown in FIG. 7G obtained by the waveform shaping circuit 20 is applied to the inverting circuit, and after being converted into the waveform shown in FIG. 7G with inverted polarity, it is applied to the AND circuit. On the other hand, a vertical synchronizing signal shown in FIG. 7a is supplied to the AND circuit from the input terminal 13. The AND circuit performs an AND operation between a signal having a waveform shown in FIG. 7a and a signal having a waveform shown in FIG. 7C, and as a result, a signal having a waveform shown in FIG. 7D is obtained.

The signal obtained by the AND circuit is fed to a retrigger type monostable multivibrator. In a retrigger type monostable multivibrator, when a pulse is supplied, the polarity of the output is reversed for a set time, and when the next pulse is supplied within the set predetermined time interval, the polarity of the output is reversed again at this point. The period during which the output polarity is reversed is extended by the set time width.

This method repeats the same operation when further pulses are supplied one after another, and is currently widely used.

Now, in this embodiment, the above-mentioned predetermined time is set to one vertical period or more. Therefore, the output signal waveform of the retrigger type monostable multivibrator is as shown in Figure 7e.
When a horizontal period signal is superimposed on the vertical synchronization signal a,
A signal with inverted polarity is obtained. By the way, input terminal 13
When the horizontal synchronization signal is not superimposed on the vertical synchronization signal supplied to the vertical synchronization signal (in the embodiment shown in FIG. 2, when the switching circuit 6 selects the signal of the second television system), Considering the waveform of the signal supplied to the AND circuit, the waveform supplied from the input terminal 13 is as shown in Fig. 7b.
(The waveform shown, the waveform supplied from the inversion circuit is the waveform shown in FIG. 7C, and therefore no pulse is supplied to the retrigger type multivibrator. Therefore,
The polarity of the output signal of the detection circuit 22 is not inverted. That is, when a horizontal period signal is superimposed on the vertical synchronization signal and when it is not superimposed, in other words, when a standard format television signal is being received, and when the second television format is being received. When receiving the signal, the output of the detection circuit 22 is a signal with inverted polarity. Note that although the case where a retrigger type multivibrator is used has been described, the same effect can be obtained using an ordinary multivibrator.

The output of the detection circuit 22 is supplied to the control means 23. The control means 23 controls the operation of the auxiliary deflection port 1@19 according to the polarity of the output signal of the detection circuit 22. That is, the operation of the auxiliary deflection circuit 19 is stopped only when a signal of the second television system is being received. Any conventional means may be used to stop the operation of the auxiliary deflection circuit 19, such as stopping the supply of power to the auxiliary deflection circuit 19. 0, or the output signal f from the auxiliary deflection port [19] may be turned off.

In this way, when the switching circuit 6 selects and receives the standard television signal, the auxiliary deflection operation is performed, and conversely, the switching circuit 6 selects and receives the second television signal. Sometimes it is possible to stop the operation of the auxiliary deflection.

Incidentally, in the embodiment shown in FIG. 2, a case has been described in which the signal superimposition circuit 8 uses the horizontal synchronization signal HD1' obtained in the signal conversion circuit 3 as a signal to be superimposed on the vertical synchronization signal VD1'. It is clear that the same effect cannot be obtained even if the horizontal synchronizing signal HD1 obtained by circuit 2 is used. In addition, horizontal synchronization signals HD1 and HD1'
The same effect can be obtained by superimposing a signal obtained by dividing the frequency of the vertical synchronizing signal VD.
1' is the same even if it is not a periodic signal.

As shown in FIG. 8, the signal superimposition circuit 8 also performs a logical OR operation on a signal obtained by inverting the vertical synchronization signal VD1' (No. 8 Na) and a signal obtained by inverting the horizontal synchronization signal HD1' (FIG. 8b). , the signal shown in FIG. 8G may be created, and this signal may be further inverted and supplied to the switching circuit 6 as the vertical synchronizing signal VD1'. At this time, if the detection circuit 22 has a configuration in which an inverting circuit is provided between the AND circuit of the embodiment shown in FIG. 6 and the input terminal 130, the input signal waveforms applied to the AND circuit will be as shown in FIG. Therefore, the output becomes a signal with the waveform shown in FIG. 8e. As a result, a signal having a waveform shown in FIG. 8f is obtained as an output signal of the detection circuit 22.

Next, in the embodiment shown in FIG. 2, a configuration is shown in which a horizontal synchronizing signal is superimposed on the vertical synchronizing signal of the standard system, but the vertical synchronizing signal HD2 or the horizontal synchronizing signal HD2 or It is obvious that the same effect can be obtained even if HDl and HD1' are superimposed and supplied to the switching port w56.

However, in this case, it goes without saying that the control of the operation of the auxiliary deflection circuit 19 by the control means 23 for the output of the detection circuit 22 and the polarity of the signal should be configured to have a polarity opposite to that shown in the embodiment of FIG. It is.

Next, in the embodiment shown in FIG. 2, the waveform generating circuit 18 is configured to generate a rectangular wave voltage as shown in FIG. The same effect can be obtained by driving the auxiliary coil 24, so the waveform generating circuit 18 is not limited to generating only a square wave. It is known from Japanese Unexamined Patent Application Publication No. 6
It is disclosed in Japanese Patent No. 6-42418. ).

Furthermore, in the embodiment shown in FIG. 2, the control means 23 is configured to control the operation of the auxiliary deflection circuit 19;
The present invention is not limited to this configuration. That is,
It is only necessary that the control means 23 can perform and stop the auxiliary deflection according to the polarity of the output signal of the detection circuit 22.

Therefore, a configuration in which the control means 23 controls the operation of the waveform generation circuit 18, a configuration in which the transmission of signals from the waveform generation circuit 18 to the auxiliary deflection circuit 19 is controlled, and a configuration in which the transmission of signals from the auxiliary deflection circuit 19 to the auxiliary coil 20 is controlled. There are control structures, etc., and the same effects as the embodiment shown in FIG. 2 can be obtained in either case.

Further, in the embodiment shown in FIG. 2, the case is shown in which the auxiliary coil 24 is used as a means for performing auxiliary deflection.

As shown in Japanese Patent Application No. 141203, the same effect can be obtained by superimposing the output of the auxiliary deflection circuit 19 on the convergence signal or vertical deflection signal, or by providing an electrostatic deflection electrode and feeding it to this. is obtained.

As described above, the present invention superimposes the transmission of the signal for performing auxiliary deflection on the vertical synchronization signal, so there is no need to increase the number of input terminals of the display section or the number of cables for signal transmission. The objective can be achieved, and therefore, the effect of reducing costs and simplifying the configuration is achieved.

[Brief explanation of the drawing]

Figures 1 and 1b are block diagrams showing a conventional example and waveform diagrams for explaining the operation; Figures a and b are waveform diagrams for explaining the waveform generation circuit 18 in Figure 2; 6a and 6b are block diagrams showing an example of the waveform shaping circuit 2o of FIG. 2, FIG. 6 is a block diagram showing an example of the detection circuit 22 of FIG. 2, and FIG. 7a. b, c, d, e are waveform diagrams for explaining the block diagram in Fig. 6, and a, b, c, ! in Fig. 8 are waveform diagrams. , e and f are waveform diagrams for explaining other embodiments of the signal superimposition circuit. 2.6... Demodulation circuit, 3... Old signal conversion circuit, 6... Selector switch, 7... Display section, 8... Signal superimposition Circuit, 18...
...Waveform generation circuit, 19.・. ... Auxiliary deflection circuit, 20 ... Waveform shaping circuit,
22-1°...Detection circuit, 23...Control means. Name of agent: Patent attorney Satoshi Nakao and 1 other person No. 3
Figure 4 Figure 5 tb) Figure 7 and Figure 8

Claims (1)

[Scope of Claims] (1) Receive a standard television signal, convert the horizontal scanning frequency to n times (n is an integer of 2 or more), and convert the television signal to a horizontal A signal conversion means for converting into a signal corresponding to the scanning frequency, an auxiliary deflection means for performing auxiliary deflection in the vertical direction with a signal synchronized with the horizontal scanning frequency of the standard method, and a horizontal scanning frequency nearly n times that of the standard method. means for receiving signals of at least one second television system, and switching means for switching between the standard television signal and the second television system signal and applying the signal to the display section. , and signal superimposition means for superimposing a signal narrower in pulse than the vertical synchronization pulse on the vertical synchronization signal of the standard system or the second television system, and a waveform generator for generating a signal to be supplied to the auxiliary deflection means from the horizontal synchronization signal. means, a detection means for detecting whether or not a narrower pulse signal than the vertical synchronization pulse is superimposed on the vertical synchronization signal, and a control means for controlling the operation of the auxiliary deflection using the output of the detection means. A television device comprising: (2) The television device according to claim 1, wherein the signal whose pulse is narrower than the vertical synchronization pulse is a signal with a horizontal period. (3) The television apparatus according to claim 1, wherein the detection means includes a monostable multivibrator having a pulse duration of -vertical period or more. (4) Claim 1, characterized in that the control means controls the operation of the V waveform generation means depending on the output of the detection means.
Television equipment as described in Section 1. (6) The television apparatus according to claim 1, wherein the control means controls the operation of the auxiliary deflection means by the blade of the detection means. (6) The television apparatus according to claim 1, wherein the waveform generating means includes a bistable multivibrator.