JPH10271537A - Video signal measuring device - Google Patents

Abstract

(57) [Summary] [Problem] A luminance component and luminance of a line for multiplexing luminance and chrominance data in a video signal transmitted as a set of a line for multiplexing luminance and chrominance data and a line for multiplexing only luminance data. Provided is a display device for measuring a relative characteristic of a luminance component of a line in which only data is multiplexed. SOLUTION: A circuit for supplying luminance data of a line on which luminance and color difference data are multiplexed to one axis of a two-dimensional display means and supplying luminance data of a line on which only luminance data is multiplexed to the other axis. Further, a test pattern for measuring the relative characteristics of the display waveform is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal measuring device.

[0002]

2. Description of the Related Art As a conventional technique, luminance and color difference signals (Y, C
There is a video signal measuring device that measures a video signal transmitted as a set of lines multiplexing _B , C _R ). This has input means for supplying a color difference signal (C _B , C _R ) to one axis of the two-dimensional display means and supplying a luminance signal (Y) to the other axis. FIG. 2 shows an example of the configuration. However, for example, a video measuring device for measuring a high-definition video signal transmitted as a set of a line for multiplexing luminance and color difference signals (Y ', C _BV , C _RV ) and a line for multiplexing only luminance data (Y "). Note that, as a conventionally known vector display device for luminance and color difference signals, there is, for example, Japanese Patent Publication No. 61-10093.

[0003]

SUMMARY OF THE INVENTION According to the present invention, in a data format for transmitting a component color video signal, a line for multiplexing luminance and chrominance data (Y ', _CBV , _CRV ) and luminance data (Y ") are used. The present invention provides an apparatus for measuring the characteristics of a high-definition video signal transmitted as a set of lines multiplexing only (i).

With this apparatus, in addition to the conventional vector display of luminance and color difference data, two luminance data (Y ',
Y ″) can be observed.

[0005]

According to the present invention, in order to attain the above object, luminance data (Y ') of a line for multiplexing luminance and chrominance data is inputted to one of two-dimensional display means, and only luminance data is inputted. And a switching circuit for inputting the luminance data (Y ″) of the line multiplexing the two to the other of the two-dimensional display means.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.

The signals y ', c _BV , c _RV , y "shown in FIG.
Are digital serial video signals (Y ', C _BV , C _RV ,
Y ″) is decoded (serial → parallel, multiplex) and D / A-converted.

As described above, the object of the present invention is to set one line for multiplexing one luminance and color difference signals (Y ', _CBV , C _RV ) and one line for multiplexing only the other luminance data (Y "). One luminance signal component (Y ') in the video signal transmitted as a set
And a display showing the relative relationship between Y 'and Y "by the vector display of the other luminance signal component (Y"). y ′ and y ″ are temporally separated, and the luminance signal y ″ and c _BV and c _RV ideally occur exactly after a predetermined time with respect to the luminance signal y ′. Therefore, in order to compare these signals with each other, it is necessary to time-shift the signals so that they are temporally matched in a distortion-free state. The delay circuit 5 after the y ″ signal 2 is the time shift circuit, and generates the luminance signals y ′ and y ″ simultaneously. 8
Reference numerals a and 8b denote differential buffer amplifiers which output y 'and y "from the + terminal and -y' and -y" from the-terminal, respectively. Reference numerals 9a and 9b denote switch circuits for switching between y 'and -y' and between y "and -y", for example, for synchronously switching both 9a and 9b every line cycle. Therefore, to the subsequent stage, the case where y 'and y "are output and the case where -y' and-
The case where y ″ is output changes every line cycle.
Is a switch circuit for switching between a luminance signal y and color difference signals c _R and c _B shown in FIG. 11a and 11b are buffer amplifiers and 12a and 12b are low-pass filters (as an example,
1.5 MHz). Both are the same as those shown in FIG. 2 of the prior art. Reference numerals 13a and 13b denote differential amplifier circuits having horizontal (X) and vertical (Y) inputs corresponding to the horizontal axis and the vertical axis of the rectangular coordinate system for outputting to, for example, X and Y deflection plates of a CRT display device. . 14a, 14
b represents the X, Y deflecting plate. With the above circuit configuration, the waveform shown in FIG. 4 is output to the display device. If the switch circuit 10 is switched every two line periods, for example, FIGS. 3 and 4 will be displayed on the same display, and between Y ', _CBV , _CRV and Y', Y ". Can be obtained.
FIG. 5 is an example of a case where a test pattern for measuring the display waveform in FIG. 4 is displayed.

Reference numerals 100, 101, and 102 denote bright point target boxes. 100 and 101 deviate from the left and right when the white balance of y 'and y "is inappropriate. Reference numeral 102 denotes a target box for measuring the black balance because the bright point shifts right and left when the black balance between y ′ and y ″ is inappropriate. Reference numeral 103 denotes test luminous points arranged at regular intervals with respect to appropriate vector trajectories. If the gamma characteristics of y ′ and y ″ are inappropriate, the vector trajectories are marked with a curve. Thus, the relative relationship between Y ′ and Y ″ can be measured.

[0010]

As described above, the present invention provides a vector display by supplying a luminance signal y 'and a luminance signal y "of a high-definition video signal to both axes of the orthogonal display means to perform vector display. Various characteristics such as the amplitude and relative time difference of the signal under measurement can be accurately and quickly measured from a plurality of dots determined by the test pattern and the trajectories between the dots.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional technique.

FIG. 3 is an explanatory diagram of a display example of the related art.

FIG. 4 is an explanatory diagram of a display example of the present invention.

FIG. 5 is an explanatory diagram of a test pattern display example according to the present invention.

[Explanation of symbols]

1: Luminance signal y 'of a line for multiplexing luminance and color difference signals,
2: A luminance signal y ″ of a line that multiplexes only the luminance signal,
3: color difference signal Ry ′, 4: color difference signal By ′, 5,
6, 7: delay circuit, 9a, 9b, 9c: switch circuit
10: switch circuit, 8a, 8b: differential buffer amplifier circuit, 11a, 11b: buffer amplifier circuit, 12a,
12b: low-pass filter circuit, 13a, 13b: differential amplifier circuit, 14a: vertical axis deflecting plate, 14b: horizontal axis deflecting plate.

Claims (1)

[Claims] A first luminance paired with the first luminance;
A video signal measuring device for measuring a video signal to be transmitted by combining a line for multiplexing two pieces of color difference data and a line for transmitting the second luminance data forming a pair with the first luminance and color difference data; 1, a differential buffer amplifier for the luminance signal, a first switch circuit for alternately selecting the differential output of the differential buffer amplifier, a next-stage buffer amplifier, a next-stage low-pass filter, and a next-stage difference amplifier. A dynamic amplifier, two-dimensional display means having two orthogonal axes for applying outputs from the differential amplifier, a delay circuit for delaying the second luminance data, a next-stage differential buffer amplifier, A second switch circuit for alternately selecting a differential output of the dynamic buffer amplifier; a delay circuit for delaying each of the two color difference data; and a third circuit for alternately selecting two color difference data from the delay circuit. No Switch circuit, a fourth switch circuit for selecting any one of the selected signal from the third switch circuit and the selected signal from the second switch circuit, a buffer amplifier of the next stage, and a next stage. , A next-stage differential amplifier, and the two-dimensional display means for applying an output from the differential amplifier, and the first luminance signal is supplied to one axis of the two-dimensional display means. And supplying the second luminance signal to the other axis.