JPH03132182A - Video signal regenerating system - Google Patents

Abstract

PURPOSE:To enable a normal image to be displayed on both two kinds of monitors with different aspect ratios by generating a signal in which the image part of a reproducing signal is time-base expanded in a horizontal direction, or compressed in a vertical direction. CONSTITUTION:A first switch 107 is operated so that two signals corresponding to each signal can be always generated by switching the signals compressed and expanded so as to display the image with a normal aspect ratio on the monitor 2 with the aspect ratios a1 and a2 corresponding to the output of an aspect ratio detecting means 105 for signal. Also, a second switch 111 is operated so that the signal with the aspect ratio a1 can be outputted when the monitor with the aspect ratio a1 is connected, and the signal with the aspect ratio a2 in a case other than that corresponding to the aspect ratio discrimination means 112 of the monitor 2. Thereby, since the signal corresponding to the aspect ratio of the monitor 2 can be outputted from a VTR, the normal image can be displayed on each monitor even when the reproduced signal is for the one with either aspect ratio.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video signal reproducing system for two types of video signals having different aspect ratios for one screen.

[Conventional technology]

EDTV (Ex
Among the tended definition broadcasting systems, there are various wide screen television systems in which the aspect ratio of the screen is expanded.
12. No.

30, p., 43-48.

If video signals with different aspect ratios are standardized in addition to the current NTSC format television signals, a format that is compatible with the current format is expected.

In this case, since there is a high possibility that the tuner, VTR, etc. will be used in common with the conventional system, there will be a need for a video signal reproduction system that is compatible with both systems.

When using a VTR to play back signals, a VTR that can record and play back signals of both the current and new aspect ratios will, for example, be able to record and play back 16:9 signals for a monitor with a new aspect ratio of 16:9; For a 4:3 monitor, it is necessary to select and output a 4:3 signal.

[Problem to be solved by the invention]

The above-mentioned prior art does not disclose matters regarding selection of output signals of a VTR. Therefore, if the output signal of the VTR does not have an aspect ratio suitable for the connected monitor, various problems will occur, such as the video on the playback screen being distorted in the horizontal or vertical direction.

The present invention is capable of displaying a normal image on both monitors with different aspect ratios when recording and reproducing two types of video signals with different screen aspect ratios using the same device, and with the ability to display a normal image on both monitors with different aspect ratios, and to display a normal image on both monitors with different aspect ratios. The purpose is to provide an easy-to-use video signal playback system that is compatible with.

[Means to solve the problem]

The above purpose is to provide means for obtaining reproduced signals with aspect ratios a□l a, means for detecting the aspect ratios of these signals, and to make signals with aspect ratio a suitable for monitoring a2. The playback signal with aspect ratio a is a□
/a Extend the time axis by 2 times, or a in the vertical direction of the screen.
2/a1 times, and the signal with aspect ratio a2 is compressed to a
means for compressing the time axis of a reproduced signal with an aspect ratio of a2 to az/a times when outputting to a monitor of □; a first switch for switching between the reproduced signal and a compression/expansion signal of the signal;
It has means for detecting the aspect ratio of the monitor, and a second switch that switches the output signal to output a signal for displaying a correct image on the monitor, and a means for detecting the aspect ratio of the monitor.
This is achieved by configuring the monitor of , which has a discriminating means for the means for detecting the aspect ratio of the monitor.

[Effect]

In the above-mentioned video signal reproduction system, the first switch switches the compressed and expanded signal in order to display an image with the correct aspect ratio on the monitor with the aspect ratio az) according to the output of the signal aspect ratio detection means. Therefore, it always operates to generate two signals corresponding to each signal.

Further, the second switch outputs a signal with an aspect ratio a when a monitor with an aspect ratio a1 is connected, and otherwise outputs a signal with an aspect ratio a2, depending on the aspect ratio determination means of the monitor.
It operates to output a signal.

This allows the VTR to output a signal corresponding to the aspect ratio of the monitor.

[Example〕 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the video signal reproducing system according to the present invention, and 1 is a block diagram showing an embodiment of the video signal reproducing system according to the present invention.
A VTR 110 capable of recording and reproducing signals a is a recording signal processing section of the VTR, 100 is a reproduction signal processing section, and 110 is an output signal switching section.

Here, a signal with an aspect ratio a1 is, for example, a new standard video signal with an aspect ratio of 16:9 (a = 16/9), and a signal with an aspect ratio a2 is, for example, an aspect ratio of 4:
3 (a = 473) as a conventional video signal.

11 is a video signal input terminal; 12 is a wide decoder that converts a transmission signal with an aspect ratio of a0 into a recording/reproducing signal; 1;
3 is a signal discrimination circuit that discriminates the aspect ratio of the input signal;
14 is a switch, 15 is a recording signal processing circuit, 16 is a recording head, and 101 is a magnetic tape.

102 is a playback head, 103 is a preamplifier, 104 is a playback signal processing circuit, 105 is a signal discrimination circuit that detects the aspect ratio of the signal, and 106 is a signal discriminator circuit that performs time axis compression or expansion processing of the signal based on the output from the signal discrimination circuit 105. Time axis companding circuit.

107 is a switch, 112 is a monitor discrimination circuit for detecting or discriminating a signal from the display discrimination signal input terminal 114, 111 is a switch, and 113 is a reproduction signal output terminal of the VTR.

2 is a monitor with an aspect ratio of A1; 121 is a video signal input terminal; 124 is a monitor signal processing circuit; 123 is a monitor discrimination signal generation circuit that outputs a signal such as a specific periodic pulse to determine the aspect ratio of the monitor; 122 is a monitor This is a discrimination signal output terminal.

FIG. 2 is a waveform diagram for explaining FIG.
) is a transmission signal with a wide aspect ratio A, and the center part of the image is covered by the signal with the current aspect ratio A2. This signal is compressed and multiplexed at a position corresponding to the horizontal blanking period of , and is made to have the same horizontal periodic frequency as the current horizontal period.

When this signal is input to a current monitor, the center part of the screen will be displayed with the correct aspect ratio, and the peripheral part will be deleted.

On a wide aspect monitor, signal processing is performed by the wide decoder 12 of the VTR 1 shown in FIG. 1, so that the full angle of view of the wide aspect video is displayed correctly.

The wide decoder 12 converts the transmission signal with the wide aspect ratio a1 into a signal suitable for recording and reproduction on the VTRI (FIG. 2(b)). This signal has the same current horizontal scanning period, the central part of the video signal is compressed on the time axis, and the signal is converted into a continuous signal on the time axis including the side panel part.

Figure 2(C) shows the wide aspect recording signal (Figure 2(C)
b) This is a waveform obtained by expanding the central part of (a) on the time axis and outputting it to a current monitor, with one peripheral part deleted.

The wide aspect ratio A signal is detected by the signal discrimination circuit 13, and subjected to signal processing by the wide decoder 12.
The signal is sent to the recording signal processing circuit 15 via the changeover switch 14 and recorded on the magnetic tape 101.

On the other hand, the current signal with the aspect ratio a2 is recorded in the same manner as it is input to the input terminal 11 via the switch 14 and the recording signal processing circuit 15.

The playback signal is the output of the playback head 102 and is sent to the preamplifier 103.
The signal is amplified by the reproduced signal processing circuit 104, and the aspect ratio is determined by the signal determining circuit 105.

The signal discrimination performed here is carried out depending on the transmission signal standard of the wide aspect ratio A process, for example, by detecting the pulse width of the synchronizing signal or an identification signal added to the blanking period, or by the wide decoder 12. There is a method such as adding a detection signal and detecting that signal.

The companding circuit 106 outputs a reproduced signal with a wide aspect ratio a.
, the center of the screen is 81/a 2 times (
4/3 times) and time axis expansion (or the screen is az/a□ times (
If the playback signal has an aspect ratio of A2, it can be displayed on a monitor with a wide aspect ratio of A.
The time axis is compressed by 2 times).

A switch 107 switches between the reproduced signal and a signal obtained by time-axis companding processing of the reproduced signal.

The output signal switching section 110 switches the two outputs of the switch 107 obtained from the reproduction processing section 100 according to the monitor used.

The monitor discrimination circuit 112 has a monitor discrimination signal input terminal 114.
An aspect monitor discrimination signal with a wide aspect ratio a□ is detected from.

The switch 111 switches the output signal according to the output of the monitor discrimination circuit 112, and if there is no discrimination signal, it means that a monitor with an aspect ratio of A2 is connected, so it outputs a signal suitable for the monitor with an aspect ratio of A2. , when a discrimination signal is detected, a signal suitable for a wide aspect ratio monitor is output, and a video signal is supplied from the output terminal 113 to the monitor.

When the monitor discrimination circuit 112 detects that the monitor 2 is a monitor with a wide aspect ratio a1, the switch 111 is turned in the direction shown in FIG.

Otherwise, they are connected in the opposite direction.

Further, when the signal discrimination circuit 105 detects that the aspect ratio of the reproduced signal is a, the switch 107 switches to the first
Connected in the direction shown, otherwise in the opposite direction.

At this time, the time axis companding circuit 106 expands the time axis of the central part of the screen by 80,782 times for a monitor with an aspect ratio of A2 when the reproduced signal has a wide aspect ratio of A, and otherwise az to monitor a engineer
/a Switch to compress the time axis by a factor of □.

That is, the input signal to the monitor with the aspect ratio a1 is either a recording/reproduction signal with the aspect ratio a or a signal obtained by compressing the time axis of the recording/reproduction signal with the ratio a2 to asparagus 1, and this signal is processed by the monitor signal processing circuit 124. to obtain a projected image with the correct aspect ratio.

The monitor discrimination signal generation circuit 123 always generates continuous specific cycle pulses or is a DC power supply, and outputs this output from the terminal 122 to the VTR side.

Further, the cable connecting the VTRI and the monitor 2 may be formed into a set of two cables for a video signal and a monitor discrimination signal, so that the discrimination signal of the monitor 2 is input to the VTRI when the cable is connected.

In this case, the terminals 113 and 114 and the terminals 121 and 122 are integrated, but the shape of the connector is changed, for example, by reversing the concave and convex portions of the current one, so that it can be connected to a monitor with an aspect ratio of A2 or a current VTR. It is desirable to prevent any problems from occurring.

FIG. 3 is a block diagram showing a second embodiment of the video signal reproduction system according to the present invention, in which the input terminal for the monitor discrimination signal of the first embodiment of FIG.
This is an embodiment in which monitor discrimination is performed on the VTR side, and the recording signal processing section 10 and reproduction signal processing section 100 of the VTRI have the same configuration as in the first embodiment.

The output signal switching unit 110 includes a switch 111 for switching the 8-power signal, a horizontal blanking period detection circuit 131, a DC potential detection circuit 132 of the output terminal 113, and a capacitor 1.
It consists of 35.

The a-monitor 2 includes a horizontal blanking period detection circuit 134, a DC potential superimposition circuit 133, a monitor signal processing circuit 124, and a capacitor 136.

In the a-monitor 2, the detection circuit 134 detects the horizontal blanking period of the video signal, and the DC potential superimposition circuit 133 adds a DC potential to the video signal input terminal during this period.

In the VTRI, during the period detected by the horizontal blanking period detection circuit 131, the presence or absence of a DC potential at the output terminal 113 is detected by the DC potential detection circuit 132, and the switch 111 is switched. In FIG. 3, the switch 111 is connected in the direction shown when there is a DC potential, and in the opposite direction otherwise.

This makes it possible to detect the a-monitor on the VTR 1 side only by connecting the video signal input terminals 113 and 121.

FIG. 4 is a diagram showing an embodiment in which the monitor is determined by the connection of the video signal output terminal in a VTR having Y/C separated outputs in the same manner as in FIG. Reproduction signal processing section 100 and output signal switching section 110
141 is an FM demodulator that demodulates the reproduced luminance FM modulation signal into the baseband band, 142 is a frequency conversion circuit that converts the reproduced chromaticity signal into the color subcarrier frequency band, 1
43 is a chromaticity signal demodulation circuit that demodulates the reproduced chromaticity signal into a color difference signal in the baseband band; 144 is a modulation circuit that modulates the baseband signal back into the chrominance subcarrier band; 145, 14;
7 is a reproduced luminance signal output and input terminal; 146 and 148 are reproduced chromaticity signal output and input terminals; and 149 is a discrimination signal superimposition circuit that superimposes a monitor discrimination signal such as a DC potential on the chromaticity signal.

150 is a monitor discrimination circuit that separates and detects a monitor discrimination signal.

In a VTR having such a Y/C separated output, since the chromaticity signal is a carrier band signal, it is possible to superimpose a DC potential on an 81 monitor or a low frequency signal of several 100K) Iz or less, and also , discrimination signals of specific frequencies other than the color subcarrier band chromaticity signal band can also be used, and these signals can be
It can be detected relatively easily by TR.

The reproduction signal obtained from the magnetic tape 101 is sent to the preamplifier 1.
After amplification by 03, the luminance modulated wave is FM demodulated by a luminance signal reproduction processing circuit 151 and converted into a baseband signal. Further, the low frequency converted color signal is converted into a color subcarrier band signal by the chromaticity signal frequency converter 142.

FM demodulation: The luminance signal after A is subjected to time axis compression/expansion in the same way as in the previous embodiment, and the chromaticity signal is demodulated into color difference signals of two types of baseband bands in the demodulation circuit 143. After axial companding, the signal is modulated again into a color subcarrier band signal by the modulation circuit 144.

Switches 107A and 107B are used to switch between a signal with time axis companding and an original signal in accordance with the output of the signal discrimination circuit 150, as in the previous embodiment, and switch all signals according to the connected monitors a and a2. Outputs brightness and color signals.

In the monitor 2, a discrimination signal such as a DC potential or a low frequency signal as described above is superimposed on the chromaticity signal input terminal 148 by a monitor discrimination signal superimposing circuit 149, and in the VTR 1, a discrimination signal such as a DC potential or a low frequency signal as described above is superimposed on the chromaticity signal input terminal 148. A monitor discrimination signal is detected and switches IIIA and H are switched to output a signal suitable for the monitor.

In this example, since Y/C separation and separation signal transmission is used, it is not applicable to conventional monitors that do not have a Y/C component input terminal, but as a circuit necessary for discrimination, for example, In this case, the monitor discrimination signal detection circuit 150 can be realized with a configuration such as a low-pass filter and a differential amplifier, and monitor discrimination can be easily performed.

FIG. 5 is a diagram showing an embodiment in which the monitor 2 does not require a monitor discrimination signal generation circuit, and the VTR 1 includes the monitor discrimination signal generation circuit 123 of the first embodiment, and the output and input of this signal. It has terminals 162°161, and a1 monitor 2
It also has an input terminal for this signal and output terminals 164, 163, and these terminals are electrically connected.

When connected to the a1 monitor 2, the switch 111 of the VTR 1 switches its output to a by a signal from the discrimination signal circuit 123.
Switch to the factory signal. Also, at this time, the discrimination signal circuit 12
3 can also be used for switching the DC potential.

The connection between monitor 2 and VTR1 can be made by combining each three terminals into one connector, and among these, the terminal for discriminating signal transmission is conductive when a conventional VTR is connected to monitor a2. It is necessary to choose a shape that does not have

In the above embodiment, some kind of aspect ratio determination means is required on the monitor side, and the case where the monitor and VTR are connected to automatically determine the monitor is explained. No action is required.

In this case, the output signal switching unit 110 has an external switch, detects manual switching from the outside, and
1, a reproduction signal with a required aspect ratio can be obtained from the video output terminal 113.

As mentioned above, V is used as a reproduction signal source in a video signal reproduction system.
Although the explanation has been given using a TR as an example, the present invention can be commonly applied to all other video equipment capable of outputting a signal with an aspect ratio of A, such as a video disc playback device.

〔Effect of the invention〕

As explained above, according to the present invention, in addition to the current A2 aspect ratio, when four people receive an AL signal with a wide aspect ratio, a device capable of reproducing all A2 signals and an aspect ratio of each In this system, the correct image can be displayed on each monitor, regardless of the aspect ratio of the reproduced signal. In addition, it becomes possible to switch the playback signal by automatically determining the aspect ratio of the monitor, improving usability for the user, and providing a video signal playback system with excellent functions, excluding the problems of the above-mentioned conventional technology. be able to.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the video signal reproducing system according to the present invention, FIG. 2 is a waveform diagram for explaining FIG. 1, and FIG. 3 is a second embodiment of the video signal reproducing system according to the present invention. FIG. 4 is a block diagram showing an embodiment, and FIG. 4 is a block diagram showing an embodiment in which the monitor is determined by connecting the video signal output terminal in the same manner as in FIG. FIG. 2 is a diagram showing an embodiment in which a monitor discrimination signal generation circuit is not required in FIG. 1...VTR, 2...Monitor. 10... Recording signal processing section, 10o... Reproduction signal processing section. 110... Output signal switching unit, 111... Switch. 113...Video signal output terminal. 123...Signal generation circuit for determining monitor aspect ratio. /24

Claims (1)

[Claims] 1. Different aspect ratios a_1, a_2 (a_1
> a_2) means for reproducing or recording and reproducing the two types of video signals, and a signal obtained by horizontally expanding the image part of the reproduced signal by a_1/a_2 times in the time axis from the reproduced signal with the aspect ratio a_1, or 1. A video signal reproducing system comprising means for converting the aspect ratio of the reproduced signal by generating a signal in which the image portion of the reproduced signal is vertically compressed by a_2/a_1 times. 2. In the video signal reproducing system according to claim 1, the aspect ratio converting means has a function of outputting a signal in which the image portion of the reproduced signal with an aspect ratio a_2 is compressed in the horizontal direction by a times a_2/a_1. A video signal playback system featuring: 3. The video signal reproduction system according to claim 1 or 2, wherein the aspect ratio converting means converts the aspect ratio a_1
or a_2, or a video signal reproduction system having a function of outputting both reproduction signals. 4. In the video signal reproducing system according to claim 3, the aspect ratio converting means includes means (105) for detecting the aspect ratio from the reproduced signal, and a first switch (107) that is switched by the output of the detecting means. and aspect ratio a
A video signal reproduction system characterized by obtaining signals suitable for each of monitors _1 and a_2. 5. In the video signal reproducing system according to claim 4, the aspect ratio converting means has a second switch (111) for switching the output signal, and the aspect ratio converting means is configured to switch to a signal suitable for the aspect ratio of the monitor and output the signal. Features video signal playback system. 6. The video signal reproduction system according to claim 4, wherein the aspect ratio converting means has means for detecting the aspect ratio of the monitor, and has a second switch (111) that is switched by the output of the detecting means, A video signal reproduction system characterized by having a monitor with an aspect ratio of a_1 or a_2 for displaying an output signal. 7. In the video signal reproducing system according to claim 6, the monitor with the aspect ratio a_1 has a signal generating means (123) for determining the aspect ratio of the monitor, and the aspect ratio converting means generates the determining signal. A video signal reproduction system comprising: a detecting means (112), and a second switch (111) is switched by the output of the detecting means. 8. In the video signal reproduction system according to claim 7, the monitor with the aspect ratio a_1 has an output terminal (122) for a monitor discrimination signal, and the aspect ratio conversion means has an input terminal (114) for the monitor discrimination signal. 1. A video signal reproducing system characterized in that when a monitor with an aspect ratio a_1 is connected to an aspect ratio converting means, an input/output terminal of the discrimination signal is connected. 9. In the video signal reproducing system according to claim 8, the monitor discrimination signal terminal (114, 122) and the video signal terminal (113, 121) each have an integrated connector shape, and the shape has an aspect ratio. A video signal reproduction system characterized in that conduction occurs only when a ratio conversion means and a monitor having an aspect ratio a_1 are connected. 10. The video signal reproduction system according to claim 7,
The monitor with the aspect ratio a_1 inputs the monitor discrimination signal to the video signal input terminal (121), and the aspect ratio conversion means detects the aspect ratio of the monitor from the video signal output terminal (113) with the discrimination signal detection means. A video signal reproduction system characterized by: 11. In the video signal reproducing system according to claim 10, the monitor with the aspect ratio a_1 has means (133) for superimposing a DC potential as a monitor discrimination signal, and has means (132) for detecting the DC potential. A video signal playback system featuring: 12. In the video signal reproducing system according to claim 10, the aspect ratio conversion means separates the video signal output into a luminance signal and a chromaticity signal, and the monitor with the aspect ratio a_1 receives the two signals as input and converts the chromaticity signal into a luminance signal and a chromaticity signal. A video signal reproduction system characterized by superimposing a monitor discrimination signal on a signal and detecting this. 13. The video signal reproducing system according to claim 10, wherein the addition and detection of the monitor discrimination signal is performed during a blanking period of the video signal. 14. The video signal reproduction system according to claim 6,
The aspect ratio conversion means includes a monitor discrimination signal generation means (123), an output terminal (162) and an input terminal (161).
), and the monitor with the aspect ratio a_1 connects the input terminal (164) of the discrimination signal and the output terminal (163), and outputs the signal when the monitor with the aspect ratio a_1 and the aspect ratio conversion means are connected. and the second switch (11
1) A video signal reproduction system characterized by switching. 15. The video signal reproduction system according to claim 5,
A video signal reproducing system characterized in that the aspect ratio converting means switches a second switch (111) by operating an external switch. 16. The video signal reproduction system according to claim 15, wherein the aspect ratio conversion means includes a video signal output terminal (1
13) A video signal reproducing system characterized in that the connector has a connector shape that switches an external switch of the aspect ratio converting means when connected, and the second switch (111) is switched by the switch. 17. The video signal reproduction system according to claim 4,
The aspect ratio converting means converts the aspect ratios a_1, a
A video signal reproduction system characterized by outputting both signals suitable for the monitor of _2.