JPH0352489A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain stable colored full on-screen display when a television receiver for both the PAL and SECAM systems is used and to attain black/white full on-screen display when a television receiver for the SECAM system is used by providing a high frequency modulator and a switching means capable of selectively outputting a color television signal with a broadcast frequency of the G system (G-PAL, SECAM) or the L system (L-SECAM). CONSTITUTION:When the G system is selected at the time of using a television receiver 6 for both the PAL and SECAM systems with a changeover switch 10 in an output system for a high frequency modulator 9, a switch circuit 11 is closed and a signal resulting from superimposition of a PAL color signal and luminance signal is fed to a television receiver 6, and a stable color full on-screen display is attained for the TV screen. When the L system is selected at the time of using a television receiver for the SECAM system, an output signal of the changeover switch 10 goes to a low level and a black/white full on-screen display is displayed.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This defense relates to magnetic recording and reproducing equipment such as video table recorders (VTRs), and in particular, to display reservation information in color when making timer reservations. functions displayed on the screen of the receiver (hereinafter referred to as
The present invention relates to a magnetic recording and reproducing device for both PAL and SECAM systems, which is equipped with an A screen display function.

(Prior art) Conventionally, as a VTR equipped with an on-screen display function, there is a VTR for PAL system that independently generates 0 color signal so that the displayed information is colored.
There are those for black and white display (luminance signal only) and those that insert (superimpose) display information in black and white (luminance signal only) on the colored back screen (receiving screen). In other words, in the case of the SECAM system, a system that independently generates color signals to display colors is not adopted.The reason for this is that the color signals of the SECAM system ε1 horizontal scanning period (1
This is because it is necessary to alternately generate red information and blue information for each color signal (1), which increases the size of the color signal generation circuit and increases the cost.

For this reason, character generator ICs (integrated circuits) for on-screen displays are generally designed for PAL systems, and on-screen displays for SECAM systems are equipped with the luminance signal function of the same IC as for PAL systems. is used only.

The on-screen display system used in VTRs compatible with both PAL and SECAM systems will be described below.

FIG. 3 is a block diagram showing a conventional on-screen display system for PAL, and FIG. 4 is an explanatory diagram showing an example of the display.

In FIG. 3, the key input position 21 has the function of setting a timer reservation and inputting reservation information. Character generator 1 is in A-screen mode (i.e., when setting a timer reservation or confirming a timer reservation)
generates a brightness signal for full-screen display to be displayed on the television screen based on the display instruction (display data) of the microcomputer 2, and at the same time generates the PAL color using the color subcarrier from the color oscillation circuit 3. A signal is also generated, superimposed on the luminance signal, and output to contact B of the switch circuit 4.The microcomputer 2 stores program data for performing on-screen display, and also stores display data according to reservation information. The display data is read out by operating the key input device 21.The switch circuit 4 is configured such that contacts A and B on the input side are selectively switched by a control pulse. The output terminal is connected to the video A input terminal of the color TV receiver 6.The input side contact A of the switch circuit 4 is connected to the video system circuit (the color television broadcast signal received by the antenna is passed through the tuner circuit for video detection). (Circuit that outputs as a video signal)
It is connected to the output terminal of 5. In the on-screen mode, the contact B side of the switch circuit 4 is selected by the on-screen mode control pulse output from the character generator 1, so the video output (on-screen display output) to the TV receiver [16] is as follows. A superimposed version of the luminance signal and color signal from the character generator 1 described above is output.

As shown in FIG. 4, an example of display on a TV screen is, for example, characters in colors such as red, yellow, and white are displayed on a blue background.

FIG. 5 is a block diagram showing a conventional black and white SECAM on-screen display system, and FIG. 6 is an explanatory diagram showing an example of the display.

5 shows a configuration in which the PAL color oscillation circuit 3 is removed from the PAL on-screen display system shown in FIG. 3, and only the luminance signal is generated from the character generator 1.

An example of the display on the TV screen is shown in FIG. 6, where, for example, all white characters are displayed on a gray dorsal cord.

FIG. 7 is a block diagram showing a conventional on-screen display system for SUPERINBOSE SECAM.
There is an explanatory diagram ``e'' showing an example of the display in Figure U.

In FIG. 7, the character generator 1 generates a luminance signal to be inserted and displayed on the television screen in accordance with instructions from the microcomputer 2 during the on-screen mode, and this luminance signal is input to one of the inputs of the adder 7. Supplied at the end. On the other hand, the received video signal from the video system circuit 5 that has not undergone video detection passes through the bandpass filter 8 to extract the color signal and is supplied to the other input terminal of the adder 7.

The adder 7 adds the color signal from the bandpass filter 8 and the luminance signal from the character detector 1,
The addition output is input to contact B of the switch circuit 41. A video signal for background use is input from the video circuit 5 to the other contact A of the switch circuit 41. Since contact B is not always selected in the on-screen mode, the switch circuit 41 switches contacts 8 and 8 as appropriate using superimpose control pulses in order to insert and display on the l+t cervical screen, and outputs the TV receiver 6
supply is increasing. That is, a superimpose control pulse synchronized with the information display signal on the TV screen is output from the key unit rack generator 1, and by controlling the switch circuit 41, the superimpose control pulse is Then, the character generator 1 output on which only the color signal of the background video signal is superimposed is inserted in a time-sharing manner.
An output is generated from the switch circuit 41. The reason why the color signal of the background video signal is superimposed on the luminance signal output from the character generator 1 is to eliminate the coloring noise of the SECAM feature in the inserted luminance signal portion.

As an example of display on the TV screen, as shown in FIG. 8, all white characters are displayed on the WFI screen (reception screen).

By the way, each of the above-mentioned on-screen display systems has the following problems. Here, France [XI (
We will mainly consider TV receivers used in the SECAM system (adopting the SECAM system).

First, regarding the PAL on-screen display system described in Figure 3, there is no particular problem when using a TV receiver that supports both PAL and SECAM systems, but SEC
When receiving an image with an AM TV receiver, color loss or color noise occurs because PAL color signals are input to the TV receiver.

Further, in the on-screen display system for self-black SECAM described in FIG. 5, the on-screen display is always black and white without color.

Furthermore, the superimposed SECA described in Figure 7
In the on-screen display system for M, SECA
Of course when using an M system TV receiver, PA
Even when a TV receiver compatible with both the L system and the SECAM system is used, the displayed information becomes difficult to see because the color of the background screen changes when i<b. That is, P A
l. ．． ．． Even when using a TV receiver that supports both SECAM and SECAM systems, it is difficult to see compared to a full-screen on-screen display with stable coloring that does not change the background screen, such as the PAL signal shown in Figure 3. It was displayed.

This problem is caused by the fact that France is surrounded by fields of PAL broadcasting, and there is a high demand for VTRs that can support both PAL and SECAM systems.

<Problems to be Solved by the Invention> As mentioned above, if a PAL on-screen display system is adopted for a VTR compatible with both PAL and SECAM systems, colors may fade or disappear when a TV receiver for SECAM is used. Color noise occurs. For this reason, the black and white SEC
If you use the AM on-screen display system or the Super Invoice SECAM on-screen display system, when you use a TV receiver that supports both PAL and SECAM systems, you will see an easy-to-see, full-screen colored screen with no change in the background screen. There was a problem that the on-screen display could not be obtained.

Therefore, in order to solve the above problems, the present invention is capable of obtaining a stable full-screen on-screen display with color when using a TV receiver compatible with both the PAL system and the SECAM system. It is an object of the present invention to provide a magnetic recording/reproducing device that displays a full-screen on-screen display in black and white or an inserted display in a colored background screen when in use.

[Structure of the Invention] <Means for Solving the Problems> The present invention utilizes a PAL system and a SECA system having a display function for displaying reservation information on the screen of a color television receiver.
The magnetic recording/reproducing device is compatible with the M method, and has a key input means for inputting timer reservation information, and display data, and reads out the display data by operating the key input means. an oscillation means for outputting a color subcarrier signal of PΔ[; a character generating means having a second function of generating a PAL color signal using the color subcarrier from the means and outputting the PAL color signal while superimposing it on the luminance signal; -PAL
．． a low frequency modulator capable of selectively outputting a color television signal at a broadcast frequency of SECAM or L-SECAM; and a switching means ε for switching and setting the second function.

(Function) In the above structure, regarding the output system of the high frequency modulator, the user operates the switching means to select the G system when using a TV receiver compatible with both the PAL system and the SECAM system. When using a commercial TV receiver, select L method.

Therefore, in accordance with the switching of this switching means, the on-screen display system is also switched, and when using the G method, a full-screen display with PAL coloring is performed, and when using the L method, a black-and-white full-screen display of only luminance signals or a full-screen display with coloring is performed. This will create a superimposed display on the background screen. Therefore, when using a TV receiver that supports both PAL and εSECAM systems,
Stable full-sided on-screen display with unchanging background colors is possible, and when using a SECAMmT receiver, it is possible to display a toned screen in black and white or superimpose onto a colored background screen. will be displayed on-screen.

(Example) The present invention will be described below based on the example shown in the drawings.

Before describing embodiments of the present invention with reference to FIGS. 1 and 2, a color TV receiver in France will be described. SECAM signals in this country are broadcast in the L format, so naturally only the L format can be received on S[C8M TV receivers. Also, countries surrounding France (e.g. Belgium, West Germany, Switzerland, etc.)
...) l)A1-. The broadcasting method for communication 0 is B. Because it is a G system, PAI one-way system and SECA system in France
A TV receiver compatible with both the M system and the ULL system and the B. Both G formats can be received.

On the other hand, in the VTR for both PAL and εSECAM systems shown in the embodiment of the present invention, the output system of the high frequency modulator is changed between L system (L-SECAM) and G system (C .PAi SECA
M) can be switched, and the user
It is possible to select either the L method or the G method depending on the TV receiver used. When using a TV receiver for SECAM, the output system of the high frequency modulator of the VTR should select the L format, as receiving the G-PAL format will result in color loss or a color noise screen. .

When using a TV receiver that supports both PAL and SECAM systems, it is possible to receive both G-PAI and G-SECAM systems, so V. The G system is selected as the output system of the high frequency modulator of the TR.

FIG. 1 is a block diagram, not showing an on-screen display system, in a magnetic recording/reproducing apparatus according to an embodiment of the present invention.

The basic system operation shown in this figure is that of conventional PAL.
This is similar to the on-screen display system (see Figure 3). Components that are the same as those in FIG. 3 are denoted by reference numerals, and detailed explanations are omitted. The difference from the conventional example shown in FIG. 3 is that the L method/
A G mode changeover switch 10 is provided between the PAL color oscillation circuit 3 and the character generator 1, and a switch that is turned on, . The point is that the switch circuit 11 which operates 7I is provided.

The changeover switch 10 is a manual switch, and the contact A
is supplied with a DC voltage VDD, and the contact Bl. lt base t￥
Connected to a potential point. Then, the output terminal of the changeover switch 10 is switched to contact B when the output terminal is 1-way type, and to contact 8 when the G type is used, and the switch circuit 11 is turned on and off according to the switching of contacts A and B. It is configured to do so.

In such a configuration, the selector switch 10 of the output system of the high frequency modulator 9 allows one-way PAI and one-way SECA
When the G method is selected when using a TV receiver compatible with the M method, the output signal of the selector switch 10 becomes high level, the switch circuit 11 is closed, and the superimposed PAL color signal and luminance signal are sent to the gearactor. The signal is supplied from the generator 1 to the TV receiver 6 via the switch circuit 4, and a stable, colored, unscreened image is displayed on the TV screen. Next, when one type is selected when using a SECAM TV receiver, the output signal 8 of the changeover switch 10 becomes the level -, and the switch circuit 11 is opened as shown in the figure.
Only a luminance signal is output from the gearactor generator 1, and an on-screen display is performed in black and white without color.

FIG. 2 is a block diagram showing an on-screen display system according to another embodiment of the present invention. The basic system operations shown in this figure are the conventional FAI on-screen display system (see Figure 3) and the Super Invoice SECA system.
This is similar to the on-screen table small system for M (see Figure 7). That is, the configuration is such that the circuit structure shown in FIG. 1 is added with the circuit function shown in FIG. 7. Therefore, the same components as in FIG. 1 and FIG. 7 are designated by the same reference numerals, and a redundant explanation of each element will be omitted. The difference from the embodiment shown in FIG.
Then, the output end of the radiator 1 is connected to the contact point 8 of the newly provided switch circuit 12, while the adder 7
The output end of the adder Fl 7 is connected to the contact B of the switch circuit 12, the output end of the switch circuit 12 is connected to the contact 8 of the switch circuit 4 (or 41), and the switch Contact A of circuit 12. B is configured to be switched by the output signal of the selector switch 10 of the output system of the high frequency modulator 9. In addition, the above addition V! A
A color signal obtained by passing the video signal from the video system circuit 5 through a bandpass filter 8 is supplied to the other input terminal of the video circuit 7. The second difference from Fig. 1 is that the character
The controller 1 generates a superimpose control pulse in addition to the on-screen mode control pulse based on the instructions (display data) from the microcomputer 2, and sends the on-screen t- to contact 8 of the newly installed switch circuit 13. The control pulse for superimposition is input to the contact B of the switch circuit 13, and the control pulse for superimpose is input to the contact B of the switch circuit 13. B is switched, and one of the control pulses is sent to the switch circuit 4 (or 41
) is configured so that it is supplied to the 11'm end.

In such a structure, when the L method is selected when using a SECAM TV receiver, the output signal of the selector switch 10 becomes a low level, and the switch circuit 11 is switched on as shown in the figure.
is open ε, and at the same time, the switch circuit 13 is connected to the contact B side, the insertion mode is set by superimpose (time division control), and the switch circuit 12 is connected to the contact B side, and the output of the adder 7 is connected to the TV. To be supplied to receiving & 40,
An on-screen display with luminance Shinzuki inserted on the colored background screen (receiving screen) is displayed.Next, the P-8 method.!m
When the G method is selected when using a TV receiver compatible with the SECAM method, the output signal of the selector switch 10 becomes high level ε.
, the switch circuit 11 closes, the PAI- color oscillation circuit 3 operates, and the switch circuit 13 connects to the contact A side, resulting in a full-screen on-screen display mode, and the switch circuit 12 is connected to the contact A side. character generator 1 output that does not pass through the adder 7 (color signal f for PAL)
; and the superimposed luminance signal) becomes the on-screen display output, resulting in a stable full-screen display with PAI- coloring.

In the above embodiment, the signal to be displayed is supplied to the video input terminal of the TV receiver, but instead of this structure, the signal to be displayed is converted to a high frequency signal by the high frequency modulator C, and the signal to be displayed is supplied to the TV receiver. Of course, it is also possible to have a configuration in which it is supplied to

[Effects of the Invention 1] As described above, according to the present invention, for example in France, when making a timer reservation for a VTR compatible with both PAL and εSECAM systems, it is possible to When used, reservation information can be displayed in a stable and easy-to-read screen state. That is, PAL
Method c' = Stable full-screen on-screen display with color when using a TV receiver compatible with SECAM method ε
When using a SECAM TV receiver, it can be displayed on-screen in full black and white, or superimposed on the color screen.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an on-screen display system in a magnetic recording/reproducing apparatus according to one embodiment of the present invention, FIG. 2 is a block diagram showing an on-screen display system according to another embodiment of the present invention, and FIG. Conventional PAL method and SECA
A block diagram showing an on-screen display system for PAL in a VTR compatible with M format;
- Black and white S on VTRs that use both the SECAM and SECAM systems.
FIG. 6 is a block diagram showing an on-screen display system for ECAM, FIG. 6 is an explanatory diagram showing an example of display by the system of FIG. 5, and FIG. 7 is a block diagram showing an example of display by the system of FIG. : 8-key superimposed SEC
A block diagram showing an on-screen display system for AM,
FIG. 8 is an explanatory diagram showing an example of display by the system of FIG. 7. DESCRIPTION OF SYMBOLS 1... Gearactor generator, 2... Micro combinator, 3... PAL Irokawa charging circuit, 4, 11.12.13.41... Switch circuit, 5.
...Video system circuit (receiving circuit), 6...TV receiver, 7
・・・Additional device, 8... Bandpass filter, 9...
High frequency modulator, 10... selection switch. 21st! [Figure 7 Figure 8

Claims (1)

[Scope of Claims] A magnetic recording and reproducing device compatible with both PAL and SECAM systems, which is equipped with a display function to display reservation information on the screen of a color television receiver, and key input means for inputting timer reservation information. a control means that holds display data and reads out the display data by operating the key input means; and an oscillation means that outputs a PAL color subcarrier signal.
A first function of generating and outputting a display luminance signal based on display data from the control means, and generating a PAL color signal using a color subcarrier from the oscillation means and superimposing it on the luminance signal. A character generating means equipped with a second function of outputting a character using the G method (G-PAL), which inputs a video signal and an audio signal.
a high frequency modulator capable of selectively outputting a color television signal of a broadcasting frequency of a broadcasting frequency of a broadcasting frequency of a broadcasting frequency of a broadcasting frequency of a broadcasting frequency of a broadcasting frequency of a broadcasting frequency of a broadcasting frequency of a broadcasting frequency of a broadcasting frequency of a broadcasting frequency of a broadcasting frequency of a broadcast frequency of a broadcasting frequency of a broadcasting frequency of a broadcasting frequency of a broadcasting frequency of a broadcasting frequency of a broadcasting frequency of a high frequency modulator of a high frequency modulator of a high frequency modulator; 1. A magnetic recording and reproducing device comprising: switching means for switching between first and second functions.