JPS6174459A - Television receiver - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is applicable not only to ordinary television broadcast reception, but also to video tape recorders, video disk players, satellite broadcasts, personal computers, so-called captain demodulators,
The present invention relates to a television receiver that can selectively receive video signals from a teletext demodulator or the like.

[Conventional technology]

In addition to receiving regular television broadcasts, video tape recorders, video disc players, TV broadcasting, No.4-
It can switch and receive video signals from computers, so-called captain demodulators, teletext demodulators, etc.
A television receiver as shown in FIG. 2 has been proposed.

In FIG. 2, when receiving a normal composite video signal from a normal television broadcast reception tuner, video tape recorder, video disk player, satellite broadcast reception tuner, some personal computers, etc. A composite video signal supplied to an input terminal (1) is supplied to an RGB processing circuit (3) through a video processing circuit (2) to form three primary color signals of a red signal R1, a green signal G and a blue signal B. In addition, the video/RGB switching signal supplied to the input terminal (4) is connected to the process circuit (
3), whereby the three primary color signals from the selected video signal are supplied to the color cathode ray tube (6) through the output circuit (5).

Further, the composite video signal from the input terminal (1) is supplied to a synchronization separation circuit (7), and vertical and horizontal synchronization signals are separated. Furthermore, the switching signal from the input terminal (4) is transmitted to the separation circuit (
7), the vertical synchronizing signal from the selected video signal is supplied to the vertical deflection circuit (8), and the formed vertical deflection signal is applied to the vertical deflection yoke (9) of the color cathode ray tube (6). Supplied. Further, the horizontal synchronizing signal from the video signal selected by the separation circuit (7) is supplied to the AFC circuit αO, the signal from this AFC circuit (ld) is supplied to the horizontal oscillation circuit α℃, and the mode detection circuit (2 ) is supplied to the horizontal oscillation circuit α℃.The signal from this horizontal oscillation circuit (tn) is then supplied to the horizontal deflection circuit αj, and the horizontal deflection signal formed is supplied to the color cathode ray tube (6 ) is supplied to the horizontal deflection yoke α4 of the color cathode ray tube (6).Furthermore, the signal from the horizontal deflection circuit (■) is supplied to a high voltage generation circuit (A) such as a flyback transformer, and the high voltage generated is supplied to the high voltage terminal of this color cathode ray tube (6). At the same time, a part of the signal is supplied to the AFC circuit αUK.

Furthermore, the commercial power from the power input terminal α is supplied to the power supply circuit (1
A normal voltage according to a signal from the mode detection circuit is supplied to the horizontal deflection circuit. Further, the commercial power from the power input terminal C17) is supplied to other power supply circuits (to), and the generated voltage is supplied to the other circuits.

As a result, a normal composite video signal is received. On the other hand, when receiving the three primary color signals of digital or analog R, G, and B signals from some personal computers, so-called captain demodulators, teletext demodulators, or scan converters, the input terminal ( 2OR
), (20G), (20B) and the input terminals (21R), (20B).
21G), analog R supplied to (21B),
G and B signals are selected with the changeover switch (A) and the RG
K is supplied to the B process circuit (3), selected by a switching signal from the input terminal (4), and simultaneously supplied to the output circuit (5).

Also, digital R, G and B from the input terminal (20S)
The synchronizing signal of the signal and the synchronizing signal of the analog R, G, and B signals from the input terminal (21S) are selected by the changeover switch and supplied to the synchronization separation circuit (7), and the synchronized signal is sent to the input terminal (4).
Vertical deflection circuit (8) and A
Supplied to the FC circuit. Further, the signal from the separation circuit (7) is supplied to the mode detection circuit (2), and a control signal corresponding to the frequency of the horizontal synchronization signal is formed to form the horizontal oscillation circuit α.
ω, the horizontal deflection circuit (to) and the power supply circuit are supplied on the 6th.

As a result, the three primary color signals of digital or analog R, G, and B signals are received. Furthermore, when performing so-called superimposed image reception in which R, G, and B signals are displayed superimposed on the above-mentioned normal composite video signal, the switching signal supplied to the input terminal (4) is set to RGB mode. In addition, Y indicating the position of the signal to be applied to the input terminal (c), the signal and the signal
A Ym signal indicating the range to be imposed is supplied to the RGB processing circuit (3), and switching between the composite video signal and II m R, G, and B signals is performed between these Y and Y signals.

Various signals are received in the manner described above.

Furthermore, in the above-mentioned device, the horizontal deflection system is specifically the third
It is configured as shown in the figure. In Figure 3, the separation circuit (
The horizontal synchronization signal from 7) is sent to the horizontal synchronization signal input terminal (7H
) is supplied to a frequency-voltage conversion circuit (31) K constituting the mode detection circuit (incorporated) to form a voltage according to the horizontal frequency. This voltage is passed through the limiter circuit G which determines the lower limit and the horizontal oscillation circuit αD through the buffer amplifier (to).
It is supplied to a voltage controlled variable frequency oscillator (VCO) (c) that constitutes the oscillator. The oscillation output of this vco@ is supplied through the drive circuit (to) to the -1 switching transistor (to) constituting the horizontal deflection circuit (to).

Further, the voltage from the frequency-voltage conversion circuit (31) is supplied to, for example, a YZ-type parametric power supply circuit constituting the power supply circuit αd through a limiter circuit that determines upper and lower limits and a gain control amplifier. The output voltage of this power supply circuit is fed back to the gain control amplifier (9) through the voltage dividing circuit (6) to stabilize the output voltage. This output voltage is supplied to a flyback transformer 61).

A horizontal output transistor (to) is connected in series to this flyback transformer Oυ. Also, this transistor 00
A damper diode (6), a capacitor for common photography (g), and a series circuit of a horizontal deflection yoke a4 and a figure-8 correction capacitor are connected in parallel to.

In addition, when the horizontal synchronization signal is supplied to the detection circuit (to) K that constitutes the AFC circuit α1, a signal from the voltage divider circuit (c) provided in series with the transistor (to) K is supplied to the detection circuit (to). Supplied.

An AFC signal is formed. This signal is supplied to the control terminal of vco N through a low pass filter (LPF) @η.

Furthermore, a switch circuit (
9) through which the four capacitor wheels are connected. In addition, the capacitor Kanso is connected to the figure 8 correction capacitor through a parallel K and a switch circuit (9). Also, the voltage from the frequency-voltage conversion circuit (3]) is, for example, 20% of the input horizontal frequency.
20kHz or less, 20 to 30K
Comparison outputs corresponding to each range of Hz, 30kHz or more are formed, and depending on the comparison outputs, a switch circuit) is generated.
Control is performed so that both of the two switches built in @ are turned off or one of them is turned on.

As a result, in this horizontal deflection system, vCO(c)
An oscillation signal that varies from 15 to 34 kHz is generated in synchronization with the input horizontal synchronizing signal to perform horizontal deflection.
A voltage varying from ~123 terts is created to control the amplitude of the horizontal deflection to be constant. In addition, in parallel with the resonance capacitor (G) and the figure 8 correction capacitor, the capacitor 00 and
] are connected, and the characteristics of each are corrected.

Further, in the above-mentioned apparatus, the vertical deflection system is specifically constructed as shown in FIG. In Figure 4, the separation circuit (
The vertical sync signal from 7) is sent to the vertical sync signal input terminal (7
) is supplied to the sawtooth wave oscillator 6 constituting the vertical deflection circuit (8).
A sawtooth wave is formed by charging and discharging with a current of . This sawtooth wave is supplied to a binary comparison circuit to form a comparison output indicating a predetermined voltage range and below or above it, and this comparison output is supplied to the control terminal of an up-down counter (UDC). be done. A vertical synchronization signal is supplied to the counting terminal of this UDCm. This UDC- count value converts a digital signal into an analog signal.A DA conversion circuit (DAC)
%, and the current source is controlled by the converted analog value.

Therefore, a sawtooth wave whose peak value (oscillation@) is controlled within a predetermined voltage range is extracted from the sawtooth wave oscillator (61), regardless of the frequency of the vertical synchronization signal. This sawtooth wave is supplied to the vertical deflection yoke (9) through an output amplification circuit. Furthermore, a series circuit consisting of a capacitor (to) and a resistor is connected in series to this vertical deflection yoke (9), and this resistor (to)
A voltage divider circuit is connected in parallel to the . This voltage dividing circuit 170
The divided voltage output is supplied to the negative feedback terminal of the output amplifier circuit.

This ensures that vertical deflection always has a constant amplitude even if the vertical frequency changes. Furthermore, by making one of the resistors constituting the voltage dividing circuit O variable, the amplitude of the vertical deflection can be arbitrarily controlled.

Furthermore, there is another set of circuits from oscillator f6]) to DACe6 (
Oscillator (c) ~ DAC171) is provided, and the D of this circuit is
AC171 output value is a pin distortion correction signal forming circuit (c)
At the same time, for example, a /4' lazer signal with a vertical period from the connection midpoint between the vertical deflection yoke (9) and the capacitor (to) is supplied to the forming circuit (c) to form a pin distortion correction signal. Ru. This signal is supplied to the pin distortion correction circuit.

Thus, in the device described above, the necessary horizontal and vertical deflections are performed according to different horizontal and vertical frequencies, as well as the reception of various signals.

[Problem that the invention seeks to solve]

By the way, in the composite video signal of television broadcasting,
When the vertical period of this composite video signal is zv and the time displayed on the video screen of the actual color cathode ray tube (6) is zD, it is determined that other video signals such as personal computers, captains, etc. demodulator, teletext demodulator,
Since there are various types of video signals from scan converters and the like, there is an inconvenience that the top and bottom of the video screen may be hidden depending on the video signal selected.

In view of these points, the present invention is capable of displaying a video signal whose display range on the video screen is determined within that range, and even when receiving a video signal whose display range on the video screen is not determined. The purpose is to obtain the optimal screen.

[Means for solving problems]

In the present invention, in a television receiver capable of receiving multiple types of video signals, for vertical effective screen adjustment,
y Provide 2 or more IJum (c) (to), for vertical effective screen adjustment of these 2 or more, 3/ IJum (c) (to)
One of them (C) can be adjusted by the user, and the other (C) is a semi-fixed resistor, and the mode in which this zolium fυ (C) is enabled can be set for these multiple types of video signals. This allows selection to be made depending on the video signal to be received.

[Effect]

According to the present invention, when receiving a video signal for which the display range of the video screen is determined, it is possible to select the optimal vertical effective screen adjustment mode in which the vertical effective screen is adjusted and fixed in advance. When receiving a video signal for which the display range of the video screen is not determined while obtaining a video screen, select Zolium f9 for vertical effective screen adjustment that can be adjusted by the user,
By adjusting this, a suitable video screen can be obtained.

〔Example〕

An embodiment of the television receiver of the present invention will be described below with reference to FIG. In FIG. 1, parts corresponding to those in FIGS. 2 and 4 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In this example, a vertical deflection system is constructed as shown in FIG. 1 in a television receiver as shown in FIG.

That is, in Fig. 1, the output terminal of the vertical output amplifier circuit (transfer) in Fig. 4 is connected to the vertical deflection yoke (9), the capacitor for figure 8 correction (to), and the resistor for current detection (to). ) is grounded through a series circuit of this capacitor and resistor (
Connect the connection point between the resistor (A) and the output amplifier circuit (
Connect the connection point of this resistor ■ and (a) to the negative feedback terminal of the selector switch 6η through the semi-fixed resistor that constitutes the vertical effective screen adjustment. Connect to the contact (81L), and also connect this resistor ■ and □□
Connect the connection point □ to the other fixed contact (81M) of the changeover switch aD via the variable resistor that constitutes the zolium (to) for vertical effective screen adjustment, and connect the movable contact (81a) of this changeover switch @D to the other fixed contact (81M) of the changeover switch aD. Ground. In this case, the zolium semi-fixed resistor for vertical effective screen adjustment is adjusted and fixed in advance to the optimal vertical screen size when receiving the composite video signal of the television broadcast signal, and the vertical effective screen adjustment is A legitimate child is provided so that the user can adjust the movable element of s+Jum(c). Further, in this embodiment, the movable contact (81a) of the changeover switch 6υ is controlled by the video/RGB switching signal supplied to the video/RGB switching signal input terminal (4). In this case, when receiving composite video signals such as television broadcasting, the vertical display range is determined, so this movable contact (81m) is connected to one fixed contact (81L), and the vertical effective screen consisting of a semi-fixed resistor is connected. Vertical display when receiving the three primary color signals of R, G, and B signals from the Matanosonal computer, Captain demodulator, Teletext demodulator, and scan converter so that the adjustment zIJum(c) becomes effective. Since the range has not been determined, this movable contact (81a) is connected to the other fixed contact (81M) so that the vertical effective screen adjustment Zolium 179, which can be adjusted by the user, becomes effective.

In addition, the connection point of the vertical supine yoke (9) and the capacitor (to) is connected to the negative feedback terminal of the output amplifier circuit (2) via a resistor (c) and a series circuit of the egg. The connection point of c) is grounded through a series circuit of a resistor (e) and a capacitor. The rest of the structure is the same as that shown in FIG.

In this example, the current flowing through the vertical deflection yoke (9) is
Attenuate this negative feedback current in the negative feedback circuit? Lium f sand,
Since (c) is inserted, the current flowing through the vertical deflection yoke (9) can be adjusted by adjusting the resistance value of this zolium 17 dipper (c).Color cathode ray tube (6)
- The vertical effective screen can be adjusted.

In this case, in this example, when receiving a composite video signal of television broadcasting, the movable contact (81
Since a) is connected to one fixed contact (81L), in this case, the vertical effective screen adjustment volume (to) made of a semi-fixed resistor is effective υ, and the optimum image can be obtained without the need for any adjustment. You can get the screen. Also, when receiving the three primary color signals of the R2O and B signals from a personal computer, etc., the movable contact (81a) of the changeover switch e1)
) to the other fixed contact (81M), the user-adjustable vertical effective screen adjustment volume (to) becomes effective, and even if the display screen range varies, the user can adjust the vertical effective screen adjustment. , g+7um(to), the vertical effective screen is adjusted, thereby obtaining an optimal video screen.

In the above-mentioned embodiment, an example was described in which two volumes (c) 9 were used, but two or more volumes may be provided corresponding to the range of the display screen of the video signal that receives the video signal. Of course, this is also a good thing. In addition, in the above embodiment, in order to adjust the vertical effective screen of the color cathode ray tube (6), a negative feedback circuit for the current flowing through the vertical deflection yoke (9) is provided with a volume Q→( C) was inserted, but in addition to this, a resistor for detecting the current flowing through the vertical deflection yoke (9) is constructed of two or more IJums, and these are switched and used depending on the video signal received. Alternatively, a circuit for changing the oscillation level of the vertical sawtooth wave oscillator may be provided with two or more volumes, and the circuit may be configured such that the volume is switched between them depending on the received video signal.
Also, between the sawtooth wave oscillator and the output amplifier circuit■
It is easy to understand that the same effect as described above can be obtained by constructing an attenuator with more than one volume and switching between these depending on the video signal to be received. Furthermore, it goes without saying that the present invention is not limited to the above-described embodiments, and that various other configurations can be made without departing from the gist of the present invention.

〔Effect of the invention〕

According to the present invention, when receiving a video signal for which the display range of the video screen has been determined, the vertical effective screen is adjusted in advance, and the fixed vertical effective screen adjustment g IJ Umk → is selected to display the optimal video screen. It can be obtained without any adjustment by the user. Furthermore, when receiving a video signal for which the display range of the video screen is not determined, p+7um4 is selected for vertical effective screen adjustment that can be adjusted by the user, and by adjusting this, the optimum video screen can be obtained. There are benefits that can be made.

[Brief explanation of drawings]

FIG. 1 is a structural diagram showing the essential parts of an embodiment of the television receiver of the present invention, FIG. 2 is a configuration diagram showing an example of a six-television receiver, and FIGS. FIG. 2 is a configuration diagram showing an example of a main part of the figure. (1) is a composite video signal input terminal, (3) is an RGB process circuit, (5) is an output circuit, (6) is a color cathode ray tube,
(8) is a vertical deflection circuit, (9) is a vertical deflection yoke, 03
is the horizontal deflection circuit, α4 is the horizontal deflection yoke, (2OR)
, (20G) and (20B) are digital R, G, respectively.
and B signal input terminals, (21R), (21G) and (21B) are analog R1G and B signal input terminals respectively, (to), ■ and lead are resistors respectively, (to) and pen are vertical effective screen adjustment respectively. 151Jum, 6υ is a changeover switch. Procedural amendment December 6, 1980 1, Indication of the case 1982 Patent Application No. 197317 3, Relationship with the person making the amendment Patent applicant address 6-7, Tokyo Parts Designed Product No. 35 name (2
18) Number of inventions increasing due to Sony Corporation Representative Director Norio Ohga 4, Agents 6, 7ii ■) In the specification, page 6, line 13 and lines 16-17 respectively [Gain control amplifier (38)] [Control amplifier (38) Correct to J] respectively. '2) In the drawings, Figures 3 and 4 are corrected as shown in the attached sheet. that's all

Claims (1)

[Claims] 1. In a television receiver capable of receiving multiple types of video signals, the vertical effective screen adjustment volume is set to 2.
1. A television receiver characterized in that a mode in which each of the volumes is enabled can be selected depending on a video signal to be received from among the plurality of types of video signals. 2. The television according to claim 1, wherein one of the two or more vertical effective screen adjustment volumes is adjustable by a user, and the other is a semi-fixed resistor. receiver.