JPH10108093A - Video signal reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a viewer from having the feeling of discomfort, even in the case of displaying the same source to left and right screens by selecting which video signal of generatable many kinds of the video signals is to be generated and performing changeover. SOLUTION: A CH decision part 9 decides whether or not signals sent from amplifying parts 5 and 8 to a signal control part 10 are the ones by the same source, based on the signal from CH changeover control parts 4 and 7. The signal control part 10 decides the method of displaying the video signals from the amplifying parts 5 and 8 on the left and right screens, based on control signals from the CH judgement part 9 and sends the video signals to be displayed on the left and right to a video signal generation part 11. In the video signal generation part 11, when a television monitor 13 is provided with a 2-screen output function, composite signals for dividing the video signals from the amplification parts 5 and 8 to the left and right and displaying them on the television monitor 13 are generated, and the video signals based on the different sources are displayed on the left and right or the video signals based on the same sources are displayed on the left and right.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a video signal reproducing apparatus capable of generating a plurality of video signals.

[0002]

2. Description of the Related Art Conventionally, an 8 mm VTR circuit and a VHSVTR
There has been a video signal reproducing apparatus capable of generating two video signals having both circuits and the like in the same housing. This will be described with reference to FIG.

[0003] The video signal reproducing device 12 is an 8 mm or VTR.
In addition to the function of playing back TV, it also has a function of receiving television broadcasts. The television broadcast signal received by the antenna 1 is
The signal is sent to both the 8 mm system amplification unit 5 and the VHS system amplification unit 8 via the reception unit 2. In addition to the television broadcast signal from the receiving unit 2, an 8 mm video signal from an 8 mm VTR reproducing unit 3 is also input to the amplifying unit 5. The amplification unit 5 is a channel switching control unit (hereinafter, referred to as “CH switching control unit”).
In response to the CH switching signal from No. 4, only the selected video signal is sent to the video signal generator 11. On the other hand, the VHS video signal from the VHSVTR playback unit 6 is also input to the amplification unit 8 in addition to the television broadcast signal from the reception unit 2. Amplifier 8
Sends only the selected video signal to the video signal generation unit 11 according to the CH switching signal from the CH switching control unit 7. In the video signal generator 11, for example, when the television monitor 13 has a two-screen output function as shown in FIG.
A composite signal for displaying the video signals from the amplifiers 5 and 8 on the television monitor 13 in a left-right divided manner is generated.

[0004]

However, the conventional 8 m
In a video signal reproducing apparatus capable of generating two video signals having both an mVTR circuit and a VHSVTR circuit in the same housing, only two types of sources can be displayed on the left and right sides, respectively. Therefore, when the output from the 8 mm VTR circuit and the output from the VHSVTR circuit are the same source, for example, the source of the same channel of the television broadcast,
Due to the difference between the two types of VTR circuit systems, the image quality of the left and right screens from the same source is slightly different, so that a viewer watching the left and right screens at the same time may feel uncomfortable.

[0005] It is an object of the present invention to provide a video signal reproducing apparatus which does not give a viewer a sense of discomfort even when the same source is displayed on the left and right screens.

[0006]

In order to achieve the above object, a video signal reproducing apparatus according to the present invention has a plurality of video signal generating means, the same number of switching means, and one signal selecting means. Each video signal generating means can generate various kinds of video signals, and the video signals generated by these video signal generating means are the same or different from each other. The switching means selects and switches which one of the various video signals that can be generated by each video signal generating means to generate.

[0007] The signal selection means has the same number of input parts and output parts as the video signal generation means and signal selection means. When some of the plurality of video signal generation units generate the same type of video by switching of the switching unit, these video signal generation units form a group. The signal selection unit selects a signal output from the output unit of the signal selection unit as described below, depending on whether each video signal generation unit belongs to the formed group. That is, when the video signal generation unit belongs to a group, the signal selection unit outputs the same video signal to a plurality of output units corresponding to the video signal generation units belonging to the group. The output video signal is any one of the signals input from the input unit corresponding to the video signal generation unit belonging to the group. If the video signal generation unit does not belong to the group, the signal selection unit outputs the video signal input to the corresponding input unit to the corresponding output unit as it is.

The video signal may include a Y signal and a C signal.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing a first preferred embodiment of the present invention.

In FIG. 1, a video signal reproducing device 12 comprises:
In addition to the function of reproducing an 8 mm or VTR, it also has a function of receiving a television broadcast. The television broadcast signal received by the antenna 1 is transmitted through the receiving unit 2 to the 8 mm system amplification unit 5.
And the VHS system amplifier 8. Amplifier 5
In addition to the television broadcast signal from the receiver 2, an 8mm VT
An 8 mm video signal from the R reproducing unit 3 is also input. The amplification unit 5 sends only the selected video signal to the signal control unit 10 according to the CH switching signal from the CH switching control unit 4.
On the other hand, the VHS video signal from the VHSVTR playback unit 6 is also input to the amplification unit 8 in addition to the television broadcast signal from the reception unit 2. The amplification unit 8 sends only the selected video signal to the signal control unit 10 according to the CH switching signal from the CH switching control unit 7.

When controlling the amplifying unit 5, the CH switching control unit 4 sends the control signal to the amplifying unit 5 and also to the CH determining unit 9. Further, when controlling the amplifying unit 8, the CH switching control unit 7 sends the control signal to the amplifying unit 8 and simultaneously
It is also sent to the H determination unit 9. The CH determination unit 9 determines whether the signals sent from the amplification units 5 and 8 to the signal control unit 10 are from the same source based on the signals from the CH switching control unit 4 and the CH switching control unit 7. Is determined, and a control signal is sent to the signal control unit 10 according to the result.

The signal control unit 10 determines a method for displaying the video signals from the amplifying unit 5 and the amplifying unit 8 on the left and right screens based on the control signal from the CH determination unit 9 and displays the video signals on the left and right. The video signal is sent to the video signal generator 11. In the video signal generator 11, for example, when the TV monitor 13 has a two-screen output function, the video signals from the amplifiers 5 and 8 are transmitted to the TV monitor 13 as shown in FIGS. Generate a composite signal for left-right split display. Here, FIG. 3 shows a case where video signals based on different sources are displayed on the left and right, and FIG. 4 shows a case where video signals based on the same source are displayed on the left and right.

Next, specific configurations of the signal control unit 10 and the video signal generation unit 11 will be described in detail with reference to FIG. In FIG. 5, reference numeral 21 denotes an 8 mm VTR circuit, and reference numeral 22 denotes a VHSVTR circuit. 8mm VTR
In the circuit 21, a video signal (hereinafter referred to as “Y
Signal. ) Is output, and a chroma signal (hereinafter, referred to as “C signal”) is output from the terminal C. In FIG. 1, these signals are transmitted from the amplifier 5 to the signal controller 10.
And specifically corresponds to a reproduction signal of 8 mm VTR, a recording monitor signal, a television broadcast signal, and the like. In the VHSVTR circuit 22, a Y signal is output from a terminal Y, and a C signal is output from a terminal C. In FIG. 1, these signals correspond to the signals sent from the amplifying unit 8 to the signal control unit 10, and specifically include a VHSVTR playback signal, a recording monitor signal, and a television broadcast signal. 8mm VTR circuit 21
And the Y signal and the C signal from the VHSVTR circuit 22 are sent to the signal control unit 10.

The signal control unit 10 includes reference numerals 23, 24, 2
It has four switches, designated 5 and 26, and
Of the switches 23, 24, 25, 2 based on the control signals input to the terminals S and T from the
6 is provided. Switches 23, 24, 2
5 and 26 have two contact pieces represented by reference symbols a and b, and as described later, the 8 mm VTR circuit 21 and the VHSVTR are provided depending on which contact side each switch is connected to. The respective Y and C signals input from the circuit 22 are allocated to the left and right Y and C terminals of the video signal generator 11 and output. Video signal generator 11
Is composed of a two-screen circuit 27, an output buffer 28 and an output buffer 29.

First, in the normal state, the switches 23 and 24 are connected to the contact piece a, and the switches 25 and 26 are connected to the contact piece b. The outputs of the switches 23 and 24 are output as the left screen Y signal and C signal, respectively, as the terminal Y of the two-screen circuit 27 of the video signal generation unit 11.
1 and the terminal C1. The outputs of the switch 25 and the switch 26 are output as a Y signal and a C signal for the right screen, respectively, as the terminal Y2 of the two-screen circuit 27
And terminal C2. The two-screen circuit 27 has a terminal Y
1 and the Y signal input from the terminal Y2 and the terminal C
The C signal input from the terminal 1 and the terminal C2 is subjected to two-screen processing, and is output from the terminal Y3 and the terminal C3. The Y signal and the C signal output from the terminals Y3 and C3 of the two-screen circuit 27 are output as the Y output and the C output from the video signal generator 11 via the output buffer 28 and the output buffer 29.

Next, when the channel on the VHS side is switched to select the same source as that on the 8 mm side, for example, a television broadcast signal of the same channel, the same source switch V control is transmitted from the CH determination unit 9 to the signal control unit 10 in FIG. A signal (hereinafter, referred to as “SSWV signal”) is sent. S
The SWV signal is input from a terminal T in FIG. When receiving the SSWV signal, the signal control unit 10 connects each of the switches 25 and 26 to the contact piece a. Then, the terminal Y and the terminal C of the 8 mm VTR circuit 21 are connected to the terminal Y2 and the terminal C of the two-screen circuit 27, respectively.
2 is connected. Therefore, the video signal from the 8 mm VTR is displayed on the right screen. At this time, since the switch 23 and the switch 24 of the signal control unit 10 are each still connected to the contact piece a, the video signal from the 8 mm VTR is also displayed on the left screen. . That is, the channel on the VHS side is switched to 8 m
When the same source as that on the m side is selected, the same video from the 8 mm VTR is displayed on both the left and right screens as shown in FIG. In this case, since the video signal from the 8 mm VTR that is the source whose channel is not switched is displayed on both the left and right screens, the left screen on the side of the 8 mm VTR that is the source whose channel is not switched at the moment when the channel is changed. Image quality does not change.

On the other hand, when the same source as that on the VHS side, for example, a television broadcast signal of the same channel is selected by switching the channel on the 8 mm side, the same source switch 8 control signal is sent from the CH determination unit 9 to the signal control unit 10 in FIG. (Hereinafter, referred to as “SSW8 signal”). S
The SW8 signal is input from the terminal S in FIG. Upon receiving the SSW8 signal, the signal control unit 10 connects each of the switches 23 and 24 to the contact b side. Then, the terminal Y and the terminal C of the VHSVTR circuit 22 are connected to the terminal Y1 and the terminal C of the two-screen circuit 27, respectively.
Connected to 1. Therefore, the video signal from the VHSVTR is displayed on the left screen. At this time, since the switch 25 and the switch 26 of the signal control unit 10 are still connected to the contact b, the video signal from the VHSVTR is also displayed on the right screen. . That is, the channel on the 8 mm side is switched to VH
When the same source as that on the S side is selected, the same video from the VHSVTR is displayed on both the left and right screens as shown in FIG. In this case, since the video signal from the VHSVTR which is the source whose channel is not switched is displayed on both the left and right screens, the right screen on the side of the VHSVTR which is the source whose channel is not switched at the moment when the channel is changed. Image quality does not change.

When the channel on the VHS side is switched to select the same source as the 8 mm side, for example, a television broadcast signal of the same channel, the SSW8 signal is sent from the CH determination unit 9 to the signal control unit 10 in FIG. It is also possible to The SSW8 signal is input from the terminal S in FIG. In this case, the signal control unit 10
Upon receiving the W8 signal, the switches 23 and 24
Are connected to the side of the contact piece b. Then, VHSV
The terminal Y and the terminal C of the TR circuit 22 are connected to the terminal Y1 and the terminal C1 of the two-screen circuit 27, respectively. Therefore, the video signal from the VHSVTR is displayed on the left screen. At this time, since the switch 25 and the switch 26 of the signal control unit 10 are still connected to the contact b, the video signal from the VHSVTR is also displayed on the right screen. . That is, when the same source as that on the VHS side is selected by switching the channel on the 8 mm side, the same video from the VHSVTR is displayed on both the left and right screens as shown in FIG.

Further, when the channel on the 8 mm side is switched to select the same source as the VHS side, for example, a television broadcast signal of the same channel, the SSWV signal is sent from the CH determination unit 9 to the signal control unit 10 in FIG. It is also possible to The SSWV signal is input from a terminal T in FIG. In this case, the signal control unit 10
When receiving the WV signal, the switches 25 and 26
Are connected to the side of the contact piece a. Then, 8mmV
The terminal Y and the terminal C of the TR circuit 21 are connected to the terminal Y2 and the terminal C2 of the two-screen circuit 27, respectively. Therefore, the video signal from the 8 mm VTR is displayed on the right screen. At this time, since the switch 23 and the switch 24 of the signal control unit 10 are each still connected to the contact piece a, the video signal from the 8 mm VTR is also displayed on the left screen. . That is, when the same source as that on the 8 mm side is selected by switching the channel on the VHS side, the same image from the 8 mm VTR is displayed on both the left and right screens as shown in FIG.

When the same source is selected on the 8 mm side and the VHS side, the CH determination unit 9 sends the SSW signal to the signal control unit 10.
Which signal of the V signal and the SSW8 signal is output
The mode can be set in advance, or the mode can be changed by manual operation. In addition, 8mm
Even when the same source is selected on the VHS side and the VHS side, the mode may be changed. By doing so, it is possible to change the output source even when the same video is displayed on both the left and right screens as shown in FIG.

The embodiment of the invention described above and FIG.
FIG. 5 shows only an example of the configuration of a reproducing portion such as an 8 mm VTR, but it goes without saying that the VTR may have a recording function. Further, in the embodiments of the present invention described above and FIGS. 1 and 5, a configuration example of only two VTR circuits is shown. However, the present invention is not limited to this, and is applicable to a case of three or more systems. A similar configuration is possible.

[0022]

As is apparent from the above description, according to the video signal reproducing apparatus of the present invention, even if the same source is selected on the left and right, there is no difference in image quality between the left and right. It is possible to prevent the viewing viewer from feeling uncomfortable.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a video signal reproducing device according to the present invention.

FIG. 2 is a block diagram showing a conventional video signal reproducing device.

FIG. 3 is a diagram showing a television monitor that displays video signals based on different sources on the left and right of two screens.

FIG. 4 is a diagram showing a television monitor that displays video signals based on the same source on the left and right of two screens.

FIG. 5 is a block diagram showing a configuration of a signal control unit of the video signal reproducing device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Antenna, 2 ... Receiving part, 3 ... 8mm VTR reproducing part,
4 CH switching control unit, 5 amplification unit, 6 VHSVTR reproduction unit, 7 CH switching control unit, 8 amplification unit, 9 CH determination unit, 10 signal control unit, 11 video signal generation unit, 12 …
Video signal reproducing device, 13 ... TV monitor, 21 ... 8m
mVTR circuit, 22... VHSVTR circuit, 23, 24,
25, 26: switch, 27: two-screen circuit, 28, 29
… Output buffer

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI H04N 5/781

Claims (5)

[Claims] 1. A plurality of video signal generation means capable of generating the same or different video signals, a same number of switching means as the video signal generation means for switching the generation signal of each video signal generation means, The video signal generating unit includes the same number of input units as the video signal generating unit and the same number of output units as the input unit corresponding to the input unit. (1) The switching unit switches the switching unit. In the case where a plurality of video signal generation means form a group that generates the same video signal,
Any one of the signals input from the input unit corresponding to the video signal generation unit belonging to the group is output to each output unit corresponding to the plurality of video signal generation units belonging to the group, and the signal belongs to the group. The signal input from the input unit corresponding to each of the video signal generating means that does not belong to the group is directly output to each output unit corresponding to each of the video signal generating means that does not belong to the group. When the video signal generation unit does not form the group, a function of directly outputting a signal input from an input unit corresponding to each video signal generation unit to each output unit corresponding to each video signal generation unit is provided. A video signal reproducing apparatus, comprising: a signal selecting unit provided. 2. The video signal reproducing device according to claim 1, wherein a video signal output from a plurality of output units of the signal selecting device is combined to generate one screen video signal. A video signal reproducing device comprising: 3. The video signal reproducing apparatus according to claim 1, wherein the number of said video signal generating means is two. 4. The video signal reproducing apparatus according to claim 2, wherein the number of said video signal generating means is two. 5. The video signal reproducing device according to claim 1, wherein said video signal is a Y signal and a C signal.