JPS62128669A - Picture output device - Google Patents

Abstract

PURPOSE:To attain the satisfactory picture output of video signals having >=3 different types of signal forms by using the 1st video signal which performs horizontal scan, the 2nd and 3rd video signals having different horizontal scan frequencies and different aspect ratios, and a means which changes the horizontal or vertical deflecting speed based on a deciding means. CONSTITUTION:A terminal 1 supplies a high definition TV signal Va having a 3:5 aspect ratio with interlace of 1,125 horizontal scan lines. A terminal 2 supplies the video signal Vb of a 3:3 aspect ratio with interlace of 1,051 horizontal scan lines. A terminal 3 supplies the video signal Vc of a 3:4 aspect ratio with interlace of 525 horizontal scan lines. then a terminal 4 supplies the normal NTSC signal Vd of a 3:4 aspect ratio with interlace of 525 horizontal scan lines. The horizontal scan frequencies can be approximated to each other within the vertical scan periods of three types of video signals through conversion of a scan line of an integer multiple. The difference of aspect ratios of three different video signals can be decided just by deciding the horizontal scan frequency within a vertical scan period. Thus the picture outputs obtained by utilizing effectively the output screens are available for >=3 types of video signals.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an image output device, and particularly to an image output device capable of handling multiple types of video signals.

<Prior art> Current television systems have a horizontal scanning line count of 5, for example.
The composition is based on an NTSC signal that performs interlaced scanning using a 25-tree tree. By the way, in recent years, so-called high-definition television systems have attracted attention, and with this, for example, high-definition cameras, high-definition receivers, etc. based on interlaced high-definition television signals with 1125 horizontal scanning lines have been announced. .

On the other hand, with the development of video printers and the demand for higher image quality for still images, there are increasing opportunities for television signals obtained by changing the scanning form of NTSC signals to be handled. For example, signals such as non-interlaced signals with 525 horizontal scanning lines and interlaced signals with 1051 horizontal scanning lines have come to be handled.

(Problems to be Solved by the Invention) As mentioned above, under the current situation where television signals with different signal formats exist independently, if you want to output these as images on a receiver, you need to output each signal format separately. Accordingly, the user has to prepare space and expense for installing a plurality of receivers, which is extremely inconvenient.

SUMMARY OF THE INVENTION In view of the above-mentioned background, it is an object of the present invention to provide an image output device that can satisfactorily output video signals having three or more different signal forms.

<Means for Solving the Problems> For this purpose, in the image output device of the present invention, a first video signal that performs n horizontal scans in a vertical scan period, and a first video signal that performs n horizontal scans in a vertical scan period; A second video signal which is horizontally scanned twice (m>n) and has a different aspect ratio from the first video signal is scanned approximately in times (i is 2 times) within a vertical scanning period.
A third video signal that performs horizontal scanning (an integer greater than or equal to) and has the same aspect ratio as the first video signal can be input, and the number of horizontal scans within the vertical scanning period of the first video signal is multiplied by one. means for determining whether the number of horizontal scans within a vertical scanning period of an input video signal is in times or m times, and means for switching the horizontal deflection speed or the vertical deflection speed based on the determination means. It has a structure that allows for

<Operation> According to the configuration as described above, the number of horizontal scans within the vertical scan period of three types of video signals can be brought close to each other by scanning line conversion by an integer multiple, which can be performed relatively easily, and
The second video signal and the third video signal can have the same signal format. Further, in accordance with this, the difference in aspect ratio of each signal can be determined simply by determining the number of horizontal scans within the vertical scan period. Therefore, it has become possible to output images of three or more types of videos (for No. 4) easily and effectively using the output screen.

<Examples> Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a schematic configuration of an image output device as an embodiment of the present invention. In the figure, 1 is a terminal to which a so-called high-definition television signal with an aspect ratio of 3:5 is input, which is a tree interlace with 1125 horizontal scanning lines, and 2 is a terminal with 1 horizontal scanning line.
051 A terminal to which a video signal with an aspect ratio of 3 to 4 is input with interlace, 3 is a terminal with a horizontal scanning line count of 525, a terminal to which a video signal with no interlacing and an aspect ratio of 3 to 4 is input, 4 is a terminal with a horizontal scanning line count of 525 This is a terminal to which a normal NTSC signal with an aspect ratio of 3:4 is input in this interlace. Hereinafter, the video signals supplied to terminals 1 to 4 will be simply referred to as Va, Vb, Vc, and Vd, respectively.

Vd is input to the interpolation circuit 5, where signals corresponding to the positions of the scanning lines of the second field and the first field are obtained by line interpolation from the signals of the first field and the second field of the NTSC signal. As a result, approximately 525 horizontal scanning signals can be obtained for one field of the NTSC signal. The output of the interpolation circuit 5 is input to the scan conversion circuit 6, which compresses one horizontal scanning period to a non-interlaced video signal (V
obtain e). As a result, Vc and Ve have exactly the same signal form, and are supplied by switch 7 to switch 8.

From switch 8, Va, Vb, Vc, Ve (7
)Lr' is output and supplied to the video signal processing circuit 9 and the sync separation circuit IO.

In the synchronization separation circuit IO, a vertical synchronization signal (VD) and a horizontal synchronization signal (HD) are separated. The VD and HD separated by the synchronization separation circuit 10 are supplied to the scanning line number detection circuit 11, which determines whether the input video signal is Va or not based on the number of HDs existing between each VD. It is detected whether it is other than

Furthermore, VD is a vertical deflection circuit 12, and HD is a horizontal deflection circuit 1.
3, respectively. Here, Va, that is, the frequency of VD of the high-definition television signal is 60Hz, and Vb, Vc
, the VDc7) frequency of Ve is 59.94Hz,
The difference is extremely small and the same vertical deflection circuit can be used. Also, the frequency of Va's HD is 33.750KHz
, Vb HD frequency is 31.498KHz, Vc and V e c7) HI) frequency is 31.469KHz
However, the well-known horizontal synchronization AFC in the horizontal deflection circuit 13
It is possible to draw them all within the drawing range of the circuit. Therefore, the horizontal deflection circuit 13 can also be accommodated without changing the circuit constants. As is well known, the vertical deflection circuit 12 and the horizontal deflection circuit 13 output sawtooth signals synchronized with VD and HD, respectively.

Next, the aspect ratio will be explained. If you now have a picture tube, you can output images as before. That is, the vertical deflection circuit 12.
The sawtooth signal obtained by the horizontal deflection circuit 13 is sent to an amplifier 14.
After being amplified in step 15, the electron beam is supplied to a horizontal deflection coil 17 and a vertical deflection coil 18 to scan the electron beam. 1
9 is a well-known high voltage rectifier circuit.

On the other hand, when the scanning line number detection circuit 11 determines that the input signal is Va, the amplification factor of the amplifier 14 is set to the normal % in order to adjust the aspect ratio. As a result, the vertical deflection of the electron beam becomes a normal percentage, so that a video signal with an aspect ratio of 3:5 is output as shown in FIG. In FIG. 2, the shaded area is the part of the fluorescent surface of the picture tube that is not scanned by the electron beam, and the white part is the part that is scanned by the electron beam.

The video signal output from the switch 8 is supplied to a video signal processing circuit 9, and the circuit 9 obtains a driving video signal which has been subjected to well-known signal processing and control of contrast, brightness, etc. This drive signal drives the picture tube 16 via the video amplifier 20 as is well known.

FIG. 3 is a diagram showing a specific configuration example of the scanning line number detection circuit 11 in FIG.
Terminals to which HD and VD are respectively input separated by 0,
41 and 42 are terminals through which these are output to deflection circuits 12 and 13, respectively.

33 is a %H killer circuit for removing pulses that are not synchronized with HD and whose timing is shifted from HD by a horizontal scanning period, out of equivalent pulses generated during the VD period;
The output of No. 3 is input to the ck terminal of the counter 34. On the other hand, VD is supplied to a frequency divider 35 to obtain a signal having a period of two fields, that is, one frame period of the interlaced signal. This signal with a period of one frame period is supplied to the monomulti 36, and a pulse of about 1 ILsec is inputted to the reset (R) terminal of the counter 34 and the ck terminal of the latch circuit 39 every two vertical scanning periods.

The output of counter 34 is fed to comparator 38,
It is compared with any data between 052 and 1124. Here, in order to simplify the data generator 37, 1088 (=2
10+26). The output of the comparator 38 immediately before resetting the counter 34 is the latch circuit 3
9, and is supplied to the amplifier 14 from a terminal 40 as a scanning line number detection output. That is, for example, when Va is input, the output of the counter 34 exceeds the output of the data generator, so the output of the comparator 38 is at a high level (
The output from terminal 40 is always Hi, and the output from terminal 40 is always Hi.
When any one of Vb, Vc, and Vd is input, the output from the terminal 40 is always at a low level (LO).

Therefore, the amplifier 14 receives a high level of the input scanning line number detection signal.
The amplification factor when . It is expressed as a percentage at the time of .

Next, a case will be described in which a picture tube for high-quality television signals, that is, for video signals with an aspect ratio of 3:5, is used as the picture tube 16. In this case, normal image output can be performed only when the input signal is Va, and the input signal is Vb, Vc.
, Vd, the amplification factor of the amplifier 15 that amplifies the output of the horizontal deflection circuit 13 is set to the usual 475. The rest of the structure is the same as that shown in FIG. For example, if the scanning line number detection circuit 11 has the configuration shown in FIG.
When it is O, the amplification factor of the amplifier 15 is 415 compared to when it is Hi.

With the above-described configuration, a video signal having an aspect ratio of 3:4 is outputted from the picture tube for high-definition television signals as shown in FIG. The meanings of the white portions and hatched portions are the same as in FIG. 2.

According to the image output device configured as described above, it is possible to output an image using the same picture tube no matter which of the four types of video signals having different signal formats is input.

In addition, differences in aspect ratio can be detected simply by detecting the number of horizontal scanning lines within the vertical scanning period, and each image can be output in the best form. <Effects of the Invention> As explained above, the present invention According to the present invention, an image output device can be obtained which can successfully output images of any of three or more types of video signals having mutually different signal forms.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a schematic configuration of an image output device as an embodiment of the present invention, and Fig. 2 shows an aspect ratio of 3 to 5 when the picture tube supports a video signal with an aspect ratio of 3 to 4. FIG. 3 is a diagram showing a specific example of the scanning line number detection circuit in FIG. 1, and FIG. 4 is a diagram schematically showing a screen on which a video signal of FIG. 2 is a diagram schematically showing a screen on which a video signal with an aspect ratio of 3:4 is output from a picture tube compatible with a video signal with an aspect ratio of 3:5 in the image output device as an example. In the figure, 1.2.3.4 are terminals to which video signals of different signal formats are input, 5 is an interpolation circuit, 6 is a scan conversion circuit, 7 and 8 are switches, 10 is a synchronization separation circuit, 1
1 is a scanning line number detection circuit, 12 is a vertical deflection circuit, 13 is a horizontal deflection circuit, 14 and 15 are amplifiers, 16 is a picture tube,
17 is a vertical deflection coil, and 18 is a horizontal deflection coil.

Claims (1)

[Claims] a first video signal that performs horizontal scanning n times during the vertical scanning period; and a second video signal that performs horizontal scanning m times (m>n) during the vertical scanning period and has a different aspect ratio from the first video signal. signal, and a third video signal that performs horizontal scanning approximately in times (i is an integer of 2 or more) within a vertical scanning period and has the same aspect ratio as the first video signal; scan conversion means for multiplying the number of horizontal scans within the vertical scanning period of the input video signal by i; means for determining whether the number of horizontal scans within the vertical scanning period of the input video signal is in times or m times; an image output device comprising means for switching a horizontal deflection speed or a vertical deflection speed based on the image output device.