JPH0666977B2 - Method and apparatus for measuring phase difference of color television signal - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a color television that manages a regulated phase of a color signal with respect to a phase of a luminance signal in a component transmission system of a luminance signal and two color signals of a color television. The present invention relates to a phase difference measuring method for a television signal and a phase difference measuring device for a color television signal used for implementing the method of the present invention.

[Conventional technology]

Conventionally, in a component transmission system consisting of a luminance signal and two color signals, the phase between each signal is managed by measuring the waveform of burst, synchronization, color bar, etc. with an oscilloscope, and it is displayed on the screen of the video monitor. There were no measurement signals that could be displayed and easily managed with high accuracy.

[Problems to be solved by the invention]

Conventionally, in order to measure the phase difference between the component signals generated in the component video signal transmission line, it is necessary to observe the waveform with an oscilloscope.Due to the roundness and distortion of the transmitted signal waveform, the phase difference must be measured. Is
Requires a high degree of skill.

Therefore, a first object of the present invention is to make it possible to easily and accurately measure and adjust the phase difference between the component signals in the component signal transmission system of the color television in a short time. It is to provide a measuring method.

A second object of the present invention is to provide a phase difference measuring apparatus for a color television signal capable of easily and accurately measuring and adjusting the phase difference between the component signals in the component signal transmission system of the color television. To provide.

[Means for Solving the Problems] In order to achieve such an object, the present invention is a component transmission system for transmitting a color television signal by a luminance signal and two color signals, and a luminance signal and two colors. In the phase difference measuring method of a color television signal, in which the phase difference generated between the signal and the signal is measured by a color pattern displayed in a color image of three primary colors, when a component signal is converted into three primary color signals and a color image is displayed. While maintaining the relationship that the level of one primary color signal of the three primary colors is constant, one of the luminance signal and the two color signals has a constant level and the other two signals have the same level. A signal having a step waveform for converting one signal from negative to positive and the other signal from positive to negative is generated, and the signal generated by the above is transmitted by the component transmission system. A color image is displayed by the primary color signal at the output end of the component transmission system.

In addition, the present invention also provides a color television signal,
A color television that measures the phase difference between a luminance signal and two color signals by a color pattern displayed on a color video monitor of three primary colors in a component transmission system that transmits the luminance signal and two color signals. In the phase difference measuring device for the John signal, when the component signal is converted into the three primary color signals and a color image is displayed, the level of one primary color signal of the three primary colors is kept constant, and the luminance signal is maintained. Among the two color signals, the level is fixed for one signal, and for the other two signals, a signal having a step waveform in which one signal changes from negative to positive and the other signal changes from positive to negative is generated. It is equipped with a generating means. Here, with respect to the step waveform of the one signal, the phase of the step waveform of the other signal, over a predetermined range,
It is preferable to change it by a predetermined value.

[Action]

According to the present invention, the measurement signal transmitted by the component transmission system is displayed on the color video monitor as a single primary color at the output end, so that the phase difference between each component signal is separately measured and adjusted. be able to.

〔Example〕

The component video signal used for transmission of a color television signal is composed of a luminance signal Y and two color signals C1 and C2 mainly transmitting red and blue color information,
In the case of displaying on a color image monitor, the three primary color signals R (red) G (green) B (blue) are returned by the equation (1).

Since the color signals C1 and C2 mainly transmit color information of red and blue, the primary color red signal R is mainly a luminance signal Y and a color signal.
C1 and the primary color blue signal B are mainly transmitted by the luminance signal Y and the color signal C2.

Here, focusing on the luminance signal Y and the color signal C1, a11ΔY + a
12 ΔC1 = 0, even if they are changed to Y + ΔY and C1 + ΔC1 while maintaining the relationship of ΔY =-(a12 / a11) ΔC1… (2), if C2 is at the same level, from equation (1), R The brightness of R = a11Y + a12C1 + a13C2 is R1 = a11 (Y + ΔY) + a12 (C1 + ΔC1) + a13C2 = R + (a11ΔY + a12ΔC1), and since the value in the parenthesis is 0, the R level does not change and the R brightness of the color video monitor Does not change.

Therefore, in order to measure the phase difference between the luminance signal Y and the chrominance signal C1, the luminance signal Y and the chrominance signal C1 having step waveforms that simultaneously change while maintaining the relationship of the equation (2) are combined to form a measurement signal. , Send to component transmission system. When C2 is a constant value, if there is a phase difference between the luminance signal Y and the color signal C1, the relative position of the step shifts, and the "red luminance constant" relationship is disturbed at the edge of the step, causing a color image monitor. By observing the pattern displayed with only the primary color red signal, the phase difference can be seen as a line appearing in the area of constant brightness.

As a result, the phase shift between Y and C1 can be detected with high accuracy.

Similarly, for the luminance signal Y and the color signal C2, the color signal C2 does not change, and changes to Y + ΔY and C2 + ΔC12 while maintaining the relationship of ΔY = − (a33 / a31) ΔCB (3) (3). If the color video monitor is displayed as the primary color blue signal by the step waveform measurement signal, the phase shift between the luminance signal Y and the color signal C2 can be detected.

Similarly, for the color signals C1 and C2, the luminance signal Y does not change, and the relationship of ΔC1 = − (a23 / a22) ΔC2 (4) (4) is maintained and C1 + ΔC1 and C2 + Δc2 are obtained. The phase shift between C1 and C2 can be detected with high accuracy by displaying and observing the primary color green signal on the color video monitor by the measured signal of the step waveform to be changed.

Hereinafter, embodiments of the present invention will be described in detail and specifically with reference to the drawings.

FIGS. 1 (A), (B), (C) and (D) are pattern diagrams showing a first configuration example of the measurement signal of the present invention.

FIG. 1 (A) is a pattern diagram showing a region of a signal component when a measurement signal according to this configuration example is displayed on a color image monitor, and reference numerals 1, 2, 3 and 4 in FIG. 1 (A) respectively. This is the display area and the step phase of the signal waveform is different. First
FIG. 1B shows step waveforms of the luminance signal Y and the color signal C1 corresponding to the display areas 1 and 2 shown in FIG. 1A, and FIG.
Shows the step waveforms of the luminance signal Y and the color signal C1 corresponding to the display areas 3 and 4, and the phases of the signals in the step portion are opposite to those in FIG. 1 (B).

FIG. 1 (D) is a pattern diagram in which the measurement signals of FIGS. 1 (B) and (C) are displayed only on the primary color red signal on the color image monitor.

FIGS. 2 (A), (B) and (C) are waveform diagrams when a phase difference occurs in the measured system according to the first configuration example of the measurement signal of the present invention, and in this configuration example, the luminance The case where the color signal C1 has a delay phase with respect to the signal Y is shown.

FIGS. 2A and 2B show that the primary color red signal R has a pulse waveform at the step portion and both end portions. The figure displayed by the primary color red signal R on the color image monitor in this case is shown in FIG. 2 (C), and bright and dark lines can be observed.

Considering that there is waveform distortion in the measured transmission system, the "half" shaped pattern of Fig. 1 (A) described above can be observed by observing the upper halves 1 and 2 and the lower halves 3 and 4 simultaneously. , The disturbance of monochromatic (red or blue) luminance on the color video monitor due to the waveform distortion was canceled, but when the waveform distortion is small, the phase difference is observed in only the upper half or the lower half. be able to.

3 (A) and 3 (B) are explanatory views of an example of component transmission system measurement (adjustment) according to the present invention.

FIG. 3A is a block diagram of a color video monitor. In the figure, 301 is a decoding matrix, 302, 303 and 304 are drive amplifiers (drive amplifiers), and 305 is a CRT. SWR, SWG and SWB are switches, and the component signals Y, C1 and C2 are provided by the decode matrix 301.
ON the decoded three primary color signals of R, G and B.
Turn off.

In FIG. 3 (B), a signal generator 306 generates a component signal having the pattern described in FIG. 1, for example.

Reference numeral 307 is a measured (adjustment) system, and 308 is the color image monitor shown in FIG. 3 (A).

The measurement signals Y, C1, and C2, which are composed of three component signals generated by the signal generator 306, are added to the transmission system under test 307 and transmitted, and at the output end thereof, a color image monitor is provided.
Connected to 308, it is possible to observe and measure (adjust) a graphic displayed in a single primary color.

FIG. 4 is a circuit system diagram showing a configuration of measurement signal generation according to an embodiment of the present invention.

In this embodiment, a case of using for a high definition television called high definition will be described as an example.

In the figure, 401 is an oscillator, which has a required oscillation frequency (1
7.28MHz) clock signal is oscillated. Reference numeral 402 denotes an H counter, which is a clock for one horizontal scanning line (17.28HMz / 33.75KHz =
512) is counted.

A V counter 403 counts the number of horizontal scanning lines (1125 lines). A V-ROM 404 stores the address (number) of the horizontal scanning line for selecting the type of signal.

405, 406 and 407 are Y-ROM, C1-ROM and C2-ROM,
The waveforms of the generated signals of Y, C1 and C2 are stored respectively, and H
The desired signal waveform data is output by the address (lower) from the counter 402 and the address (upper) from the V-ROM 404.

408, 411 and 414 are D / A converters, 409, 412 and 415 are LPF
(Low-pass filter), 410, 413, and 416 are synchronization addition circuits, and the Y signal data from the Y-ROM 405 is D / A converted by the D / A converter 408.
The converted signal is converted into a signal waveform in a required band by the LPF 409, and a synchronous signal is further added by the synchronous addition circuit 410 to output a Y signal.

Similarly, C1 signal data from C1-ROM406 and C2-ROM407
C2 signal data from the D / A converters 411 and 414, respectively.
Is subjected to D / A conversion by the LPF, low-pass filtered by the LPFs 412 and 415, and a synchronization signal is added by the synchronization adding circuits 413 and 416, and the C1 signal and the C2 signal are output, respectively.

Reference numeral 417 is a synchronization signal generation circuit which generates a synchronization signal based on the oscillation frequency of the oscillator 401 and supplies it to the synchronization addition circuits 410, 413 and 416, respectively.

FIGS. 5 (A), (B) and (C) are waveform diagrams of the second configuration example of the measurement signal according to the embodiment of the present invention, and FIG. 6 shows the second measurement signal of the present invention. It is a pattern diagram showing an example of the configuration.

In FIG. 6, 601, 602 and 603 are arranged to display three detection patterns of the first configuration example of the measurement signal shown in FIG. 1 side by side, and the detection pattern 601 includes a luminance signal Y and a color signal C1. The phase difference between and. The detection pattern 602 detects the phase difference between the luminance signal Y and the color signal C2. The detection pattern 603 detects the phase difference between the color signals C1 and C2. Reference numerals 604 and 605 respectively indicate one scanning line. 604 is a scanning line that crosses the upper half of the figures 601, 602 and 603, and 605 is a scanning line that crosses the lower half of the figures 601, 602 and 603.

FIG. 5 (A) is a waveform of each component signal Y, C1, C2 corresponding to one scanning line of FIG. 6, for example, 604, and FIG.
(B) shows the waveform of each component signal Y, C1, C2 corresponding to one scanning line of FIG. 6, for example, 605. Fig. 5
(C) shows each component signal waveform corresponding to one scanning line portion other than the figure portion of FIG.

FIG. 7 is a pattern showing a third configuration example of the measurement signal of the present invention.

In this configuration example, 66 (11 × 6) "T" figures based on signal signals whose phases are shifted by a predetermined value are arranged.

The first to third columns are patterns arranged to measure the phase difference between the luminance signal Y and the color signal C1, and the fourth to sixth columns are the luminance signal Y.
And a pattern arranged to measure the phase difference between the color signal C2 and the color signal C2.

The first column is 1 when the phase difference between Y and C1 is + 5nS to + 15nS.
Eleven "square" figures based on signals shifted by nS are arranged. Similarly, the second column has a "field" with a phase difference of -5nS to + 5nS.
The "T" figure is arranged in the range of -15nS to -5nS in the third column.

Also in the 3rd to 6th columns, a "Pattern" with a similar phase difference is arranged between Y and C2.

According to such a measurement signal, the phase difference caused in the component transmission line is canceled and the boundary line cannot be seen.
By observing the figure, the phase difference value at the corresponding place can be known, and the phase difference value of the transmission line between Y and C1 and Y and C2 can be easily and accurately measured in a short time. be able to.

FIG. 8 is a waveform diagram of a third configuration example of the measurement signal according to the present invention.

This figure corresponds to the upper half of the "column" figure in the second column for measuring the phase difference of -5nS to + 5nS between the luminance signal Y and the color signal C1 shown in FIG. A waveform example is shown.

〔The invention's effect〕

As is apparent from the above, according to the present invention, by observing the phase shift between the respective signals in the component transmission system of the color television signal on the color video monitor, it is possible to easily and highly accurately without skill. It can be measured and adjusted.

[Brief description of drawings]

FIG. 1 is a pattern diagram showing a first configuration example of the measurement signal of the present invention, FIG. 2 is a waveform diagram when there is a phase difference according to the first configuration example of the measurement signal of the present invention, and FIG. FIG. 4 is an explanatory diagram of an example of component transmission system measurement (adjustment) of the invention, FIG. 4 is a circuit system diagram showing a configuration of a measurement signal generation according to one embodiment of the present invention, and FIG. 5 is a second configuration of the measurement signal of the present invention. Example waveform chart, FIG. 6 is a pattern diagram showing a second configuration example of the measurement signal of the present invention, FIG. 7 is a pattern diagram showing a third configuration example of the measurement signal of the present invention, and FIG. 8 is a book It is a wave form diagram of the 3rd example of composition of the measurement signal by an invention. 1,2,3,4 …… Display area, 301 …… Decoding matrix, 302,303,304 …… Drive amplifier, 305 …… CRT, 306 …… Signal generator, 307 …… Measured transmission system, 308 …… Color video monitor , 401 ... Oscillator, 402 ... H counter, 403 ... V counter, 404 ... V-ROM, 405 ... Y-ROM, 406 ... C1-ROM, 407 ... C2-ROM, 408,411,414 ... D / A converter, 409,412,415 …… LPF, 410,413,416 …… Synchronization addition circuit, 417 …… Synchronization generation circuit, 601,602,603 …… Detection pattern, 604,605 …… 1 scanning line.

Claims (3)

[Claims] 1. A color television signal and a luminance signal are combined with a luminance signal.
A component transmission system that transmits by two color signals,
In the method of measuring the phase difference of a color television signal, in which the phase difference between the luminance signal and the two color signals is measured by the color pattern displayed in the color image of the three primary colors, the component signal is converted into the three primary color signals. When a color image is displayed by using the above-mentioned luminance signal and the luminance signal, the level of one of the three primary colors remains constant.
One of the two color signals has a constant level,
Regarding the other two signals, a signal having a step waveform in which one signal is converted from negative to positive and the other signal is converted from positive to negative is generated, and the signal generated by the above is transmitted by the component transmission system, A phase difference measuring method for a color television signal, wherein a color image is displayed by the primary color signal at an output end of a component transmission system. 2. A color television signal and a luminance signal
A component transmission system that transmits by two color signals,
In a phase difference measuring device for a color television signal, which measures a phase difference between a luminance signal and two color signals by a color pattern displayed on a color image monitor of three primary colors, a component signal is converted into a three primary color signal. When the converted color image is displayed, the luminance signal and the luminance signal are maintained while maintaining the relationship that the level of one of the three primary colors is constant.
One of the two color signals has a constant level,
Regarding the other two signals, the phase difference of the color television signal is characterized by comprising a generating means for generating a step waveform signal in which one signal changes from negative to positive and the other signal changes from positive to negative. measuring device. 3. A phase difference measuring device for a color television signal according to claim 2, wherein the phase of the step waveform of the one signal is predetermined over the predetermined range of the step waveform of the other signal. A phase difference measuring device for a color television signal, characterized in that the value is changed by each value.