JP2004343477A - Video / sound signal level checker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a level checker in which a video signal and a sound signal need not be checked separately and which is capable of checking whether or not a video signal level and a sound signal level are normal levels regardless of whether or not a super signal or the like is superimposed on a pilot color bar. <P>SOLUTION: The level checker is equipped with a video signal conversion part 11 for separating a separated pilot color bar video signal into a luminance signal and a color difference signal, a level detection part 18 for detecting peak levels of the luminance signal and the color difference signal and the level of the sound signal, and a level decision part 33 for simultaneously deciding whether or not the detected peak levels of the luminance signal and the color difference signal and the level of the sound signal are normal levels. In the case that the decision result of whether or not the peak level of the luminance signal detected by the level detection part 18 is the normal level is that of an area different from a white area, the white area is regarded to be caused by the super signal or the like and the decision result of the level decision part 33 is deleted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a video / audio signal level checker, and more particularly to a level checker for checking a level of a video signal and an audio signal before transmitting a material such as a VTR or a tape as a program.
[0002]
[Prior art]
2. Description of the Related Art In a program transmission system, when transmitting contents stored in a material such as a VTR or a tape as a program, the level of a video signal or an audio signal is checked by a level checker before transmission of the program. A conventional program transmission system is configured as shown in FIG. 2, for example, and separates a video / audio multiplexed signal into a video signal and an audio signal by a video / audio separation circuit 51, and separates them by individual level checkers 52A and 52B. The signal level is checked, and if any of the signal levels is abnormal, the alarm monitoring device 53 is notified of the abnormality and issues an alarm or the like.
[0003]
The configuration of tape recording of a cue portion of a VTR or the like has a format as shown in FIG. That is, before the material of the main frame to be actually transmitted, a pilot color bar and a reference audio signal are inserted as check patterns so that the levels of the video signal and the audio signal of the material can be checked. I have. The pilot color bar of the VTR or the like is, for example, a color bar as shown in FIGS.
[0004]
Further, in this conventional video signal level checker, a field image valid period such as a full-field color bar shown in FIG. 4 or an SMPTE color bar shown in FIG. 5 is area-scanned to detect a peak white level. Here, the width in the horizontal direction and the vertical direction, which is the size of the area, is set in advance in consideration of the white area of the color bar to be level-checked. If the detected peak white level is within the allowable range, it is determined to be good.
[0005]
Further, even if the detected peak white level is abnormal, if the detected peak white level is equal to or less than the set area size, the white level is determined to be a noise or a super signal inserted in the pilot color bar and canceled. . On the other hand, if the white area is larger than the white area set as described above and is out of the peak white level, it is determined that there is an abnormality, and the alarm monitor 53 or the like shown in FIG. 2 is notified (for example, see Patent Document 1).
[0006]
Further, the audio signal level checker of FIG. 2 checks whether the audio reference signal multiplexed on the pilot color bar is within an allowable range from the audio reference level, the reference frequency, and the like. The notification is sent to the alarm monitoring device 53 shown in FIG.
[0007]
[Patent Document 1]
JP-A-2002-374544
[0008]
[Problems to be solved by the invention]
However, the level check method as described above has the following problems.
[0009]
As shown in FIG. 2, since the video signal and the audio signal are individually level checked, an alarm is generated individually from each level checker of the video signal and the audio signal, and unless the operator checks each level. However, there is a problem that it is complicated and workability is poor.
[0010]
Also, as shown in FIG. 6, the logo of the station name for discriminating the material of the main part, the material number, etc. are superimposed on the pilot color bar recorded on the tape such as the VTR or tape as a super material. May be. The super material in this case is produced irrespective of the level of the video signal of the main frame recorded in the VTR, and is superimposed on the pilot color bar portion. Therefore, the above-described video signal level checker detects the peak white level of the super signal portion, and when the area of the white portion of the super signal satisfies the set condition, the portion is detected as the peak white level. Will be done.
[0011]
Then, the detected peak white level may be out of the allowable range. At this time, even if the peak white level of the original pilot color bar is within the allowable range, if the peak white level of the super signal part is out of the allowable range, the peak white level of the pilot color bar becomes the same as the peak white level of the pilot color bar. There is a problem that the level is abnormal regardless of the video signal level of a certain main frame.
[0012]
Therefore, the present invention has been made in view of the problems of the above-described conventional video / audio signal level checker, and does not require the video signal and the audio signal to be individually checked. The purpose is to provide.
[0013]
In addition, in addition to the above, the present invention provides that the video signal level and the audio signal level are adjusted before transmitting a material such as a VTR as a program regardless of whether a super signal or the like is superimposed on the pilot color bar. It is an object of the present invention to provide a video / audio signal level checker capable of checking whether or not a signal is at a level.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a video / audio signal level checker, comprising: a signal input unit for separating a pilot color bar signal into a video signal and an audio signal; A video signal conversion unit, a level detection unit for detecting the peak level of the luminance signal and the color difference signal, and a level of the audio signal; a peak level of the detected luminance signal and the color difference signal; A level determining unit that simultaneously determines whether the signal level is a normal level.
[0015]
According to the present invention, since the level determination unit has the audio signal determination unit and can determine the video and audio levels simultaneously, the burden of the operator checking the video signal and the audio signal individually is reduced. An image / audio signal level checker with good workability can be provided.
[0016]
In the video / audio signal level checker, the level determination unit sets a color bar setting unit for setting a type of an input pilot color bar, and a white area according to the color bar type set by the color bar setting unit. A determination area selection circuit for selecting, the level determination unit receives information on the white area from the determination area selection circuit, and determines whether or not the peak level of the luminance signal detected by the level detection unit is a normal level. If the determination result is for an area different from the white area, the white area is regarded as being due to a super signal or the like, and the determination result of the level determination unit can be deleted.
[0017]
As a result, even when a super signal or the like is superimposed on the video / audio signal, the white area determination result based on the super signal or the like can be deleted from the determination result of the level determination unit. When a signal or the like is superimposed, it is possible to solve the problem that the level is determined to be abnormal regardless of the video signal level of the main part frame, and it is possible to perform accurate level determination.
[0018]
The video / audio signal level checker may be configured to include a level display unit that displays a level of at least one of the detected luminance signal, color difference signal, and audio signal.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0020]
FIG. 1 is a block diagram showing an embodiment of a video / audio signal level checker (hereinafter abbreviated as “level checker”) according to the present invention. In the following description, a VTR using this level checker will be described. An example will be described in which a material signal such as is a video / audio multiplexed signal and the level of the video / audio signal is a component serial digital video signal.
[0021]
The level checker is roughly divided into a signal input section 3, a video signal input section 6, a video signal conversion section 11, an audio signal input section 8, a level detection section 18, a level determination section 33, a level display section 47.
[0022]
The signal input unit 3 includes a video / audio separation circuit 2. The video / audio signal separation circuit 2 separates the input pilot color bar signal 1 into a video signal and an audio signal.
[0023]
The video signal input unit 6 includes a video signal equalizer circuit 4 and a video signal synchronization circuit 5. The video signal equalizer circuit 4 and the video signal synchronization circuit 5 are connected to the video signal input from the video / audio signal separation circuit 2. Shape the waveform.
[0024]
The video signal conversion unit 11 includes a serial / parallel conversion circuit 9 and a Y / C separation circuit 10. The serial / parallel conversion circuit 9 converts a video signal input from the video signal input unit 6 into a parallel digital video signal. After conversion, the Y / C separation circuit 10 separates the video signal into a luminance signal and a color difference signal.
[0025]
The audio signal input unit 8 includes an audio equalizer circuit 7, and the audio equalizer circuit 7 shapes the waveform of the audio signal input from the video / audio signal separation circuit 2.
[0026]
The level detection unit 18 includes a luminance signal detection circuit 12, a color difference signal detection circuit 13, an audio signal level detection circuit 14, an audio signal frequency detection circuit 15, and an audio signal phase difference detection circuit 16.
[0027]
The luminance signal detection circuit 12 scans the effective period of the field image of the video signal input from the Y / C separation circuit 10, and determines the peak level and the line width (up to several μS) of the luminance signal at the white level for each line. Is detected. The color difference signal detection circuit 13 detects the maximum value of the color difference signal level in the line width in which the peak level of the luminance signal is detected. The audio signal level detection circuit 14 detects an audio signal level during a period during which the field image valid period of the video signal is scanned. The audio signal frequency detection circuit 15 detects an audio signal frequency during a period during which the field image valid period of the video signal is scanned. The audio signal phase difference detection circuit 16 detects an audio signal phase difference during a period in which the field image valid period of the video signal is being scanned.
[0028]
The detection circuit start signal generator 17 outputs the luminance signal detection circuit 12, the color difference signal detection circuit 13, the audio signal level detection circuit 14, the audio signal frequency detection circuit 15, The audio signal phase difference circuit 16 is started.
[0029]
The level determination section 33 includes a luminance level determination circuit 19, a color difference level determination circuit 23, a video level determination output circuit 25, an audio signal level determination circuit 26, an audio signal frequency determination circuit 28, an audio signal phase difference determination circuit 30, and the like.
[0030]
The luminance level determination circuit 19 includes a white level area setting unit 20 for setting a horizontal white level width in one line and a vertical white level width in a field effective image period, and an upper limit of a measured white level. It has a white level upper / lower limit setting unit 21 for setting a lower limit luminance signal level.
[0031]
The color difference level determination circuit 23 has a color difference level upper / lower limit setting unit 24 for setting upper and lower limits of the color difference level of the white level to be measured.
[0032]
The video level determination output circuit 25 includes a color bar setting unit 34 and a determination area selection circuit 32. The color bar setting unit 34 sets whether the pilot color bar signal 1 is, for example, a full field color bar in FIG. 4 or an SMPTE color bar in FIG.
[0033]
The audio signal level determination circuit 26 has an audio signal upper / lower limit setting unit 27 for setting an upper limit and a lower limit from a reference level of the audio signal to be measured. The audio signal frequency determination circuit 28 has an audio frequency upper / lower limit setting unit 29 for setting an upper limit and a lower limit of the audio signal to be measured from a reference frequency (1 KHz). The audio signal phase difference determination circuit 30 has an audio phase difference upper / lower limit setting unit 31 for setting the upper and lower limits of the phase difference between channels of the audio signal to be measured.
[0034]
The level display section 47 includes a luminance level display section 37, a color difference level display section 39, an audio level display section 41, an audio frequency display section 43, an audio phase difference display section 45, and the like. The maximum value of the peak level of the luminance signal supplied from the circuit 12 is displayed by controlling a display 38 such as an LED via a luminance level display section 37.
[0035]
Next, the operation of the level checker having the above configuration will be described.
[0036]
The green pilot color bar signal 1 at the beginning of the VTR or the like is reproduced and input to the signal input unit 3. Since the pilot color bar signal 1 is a video / audio multiplex signal, it is separated into a video signal and an audio signal by the video / audio separation circuit 2 of the signal input unit 3.
[0037]
The video signal separated from the pilot color bar signal 1 is subjected to waveform shaping by the video signal equalizer circuit 4 of the video signal input unit 6 and the video signal synchronization circuit 5 and is supplied to the video signal conversion unit 11.
[0038]
Next, the serial / parallel conversion circuit 9 of the video signal converter 11 converts the serial digital video signal into a parallel digital video signal. Here, since the video signal of the pilot color bar signal 1 is a component signal, luminance data (Y) and color difference data (C) are transmitted separately. Therefore, since each data can be individually extracted and processed, the video signal of the pilot color bar signal 1 converted into the parallel digital video signal is supplied to the Y / C separation circuit 10 and separated into a luminance signal and a color difference signal. The signal is supplied to the level detector 18.
[0039]
On the other hand, the audio signal separated from the pilot color bar signal 1 is subjected to waveform shaping by the audio signal equalizer circuit 7 of the audio signal input unit 8 and supplied to the level detection unit 18.
[0040]
In the level detector 18, the luminance signal supplied from the above-described Y / C separation circuit 10 is input to the luminance signal detection circuit 12. The luminance signal detection circuit 12 scans the effective period of the field image of the video signal separated from the video / audio multiplex signal of the pilot color bar signal 1 and, for each line, the peak level and the line width of the luminance signal at the white level (up to several lines). μS) is detected. The luminance signal level and the line width are supplied to the level determination section 33 and the level display section 47.
[0041]
The color difference signal supplied from the Y / C separation circuit 10 is input to the color difference signal detection circuit 13. The color difference signal detection circuit 13 detects the maximum value of the color difference signal level in the line width where the peak level of the luminance signal is detected. The maximum value of the above-described color difference signal level is supplied to the level determination unit 33 and the level display unit 47.
[0042]
On the other hand, the audio signal supplied from the above-described audio signal equalizer circuit 7 is input to the audio signal level detection circuit 14, the audio signal frequency detection circuit 15, and the audio signal phase difference detection circuit 16.
[0043]
The audio signal level detection circuit 14 detects an audio signal level during a period during which the field image valid period of the video signal is scanned, and determines the detected audio signal level by the level determination unit 33 and the level display unit 47. Supply to The audio signal frequency detection circuit 15 detects the audio signal frequency during the period during which the field image valid period of the video signal is scanned, and sends the detected audio signal frequency to the level determination unit 33 and the level display unit 47. Supply. The audio signal phase difference detection circuit 16 detects an audio signal phase difference during a period during which the field image valid period of the video signal is scanned, and determines the detected audio signal phase difference with the level determination unit 33 and the level display unit 33. To the unit 47.
[0044]
The timing at which the luminance signal detection circuit 12, the color difference signal detection circuit 13, the audio signal level detection circuit 14, the audio signal frequency detection circuit 15, and the audio signal phase difference circuit 16 start detection is based on the pilot color bar. Since it is necessary to control the timing so that the signal 1 is input to the level checker, the measurement start signal 48 is supplied from the outside in accordance with the start timing of the VTR or the like, and is input to the detection circuit start signal generator 17. The above-described luminance signal detection circuit 12, color difference signal detection circuit 13, audio signal level detection circuit 14, audio signal frequency detection circuit 15, and audio signal phase difference circuit 16 are started.
[0045]
The level determination unit 33 inputs the peak level and the line width of the above-described luminance signal to the luminance level determination circuit 19. The peak level of the luminance signal supplied from the level detection unit 18 is temporarily stored in the peak level line memory 22 until it reaches the set value of the white level area setting unit 20. It is determined whether or not the peak level satisfies the level of the luminance signal set by the white level upper / lower limit setting unit 21, and the determination result is supplied to the luminance level determination circuit 19. If the detection result is equal to or smaller than the set area, the detection result is determined to be a white level of a super signal or the like, and the determination result is canceled.
[0046]
Whether or not the maximum value of the supplied color difference signal is equal to or less than the set value set by the color difference level upper / lower limit setting unit 24 during the period in which the peak level of the luminance signal is stored in the peak level line memory 22 described above. The determination result is supplied to the video level determination output circuit 25.
[0047]
The determination area selection circuit 32 selects a white area in advance from the type of the color bar selected by the color bar setting unit 34, and supplies the information to the video level determination output circuit 25. The determination result supplied from the luminance level determination circuit 19 to the video level determination output circuit 25 is subjected to area determination based on the above-described area information, and the determination result supplied from the luminance level determination circuit 19 is compared with the information of the color bar setting unit 34. If it is in a different area, it is regarded as a super signal or the like and canceled. At this time, the determination result of the color difference level determination circuit 23 is also canceled. Also, when there is an abnormality in each level at the time of a normal pilot color bar signal, it is notified to the outside.
[0048]
It is determined whether or not the audio level supplied from the audio signal level detection circuit 14 is within the range of the set value set by the audio signal upper and lower limit setting unit 27, and if there is an abnormality, it is notified to the outside. It is determined whether or not the audio frequency information supplied from the audio signal frequency detection circuit 15 is within the range of the set value set by the audio signal frequency upper / lower limit setting unit 29, and if there is an abnormality, it is notified to the outside. . It is determined whether or not the audio phase difference information supplied from the audio signal phase difference detection circuit 16 is within the range of the set value set by the audio signal phase difference upper / lower limit setting unit 31. Notify to
[0049]
In the level display section 47, the peak level of the luminance signal supplied from the above-described luminance signal detection circuit 12 is input to the luminance level display section 37, and for example, the display 38 such as an LED is controlled, and the peak level of the luminance signal is Display the maximum value. The maximum value of the color difference signal level supplied from the color difference signal detection circuit 13 is input to the color difference level display unit 39, and controls a display 40 such as an LED to display the maximum value of the color difference signal level. The level of the audio signal supplied from the audio signal level detection circuit 14 is input to the audio level display unit 41, and controls a display 42 such as an LED to display the audio signal level. The frequency of the audio signal supplied from the audio frequency detection circuit 15 is input to the audio frequency display unit 43, and controls a display 44 such as an LED to display the audio signal frequency. The phase difference between channels of the audio signal supplied from the audio phase difference detection circuit 16 is input to the audio phase difference display unit 45, and controls a display 46 such as an LED to display the audio signal frequency.
[0050]
Next, the operation of the video / audio signal level checker when the pilot color bar shown in FIG. 6 is input to the level checker shown in FIG. 1 will be described mainly with reference to FIG.
[0051]
At the beginning of the VTR, a pilot color bar signal 1 in which a logo of a station name and a material number for discriminating the material of the main part are superimposed as a super material is input to a signal input unit 3.
[0052]
The input pilot color bar signal 1 is separated by a video / audio signal separation circuit 2 into a video signal and an audio signal. The video signal is input to the video signal input unit 6, waveform-shaped, and input to the video signal conversion unit 11. In the video signal conversion unit 11, the serial / parallel conversion circuit 9 and the Y / C separation circuit 10 separate the video signal into a luminance signal and a color difference signal and input the luminance signal and the color difference signal to the level detection unit 18.
[0053]
The audio signal is input to the audio signal input unit 8, subjected to waveform shaping by the audio equalizer circuit 7, and input to the level detection unit 18.
[0054]
The level detector 18 scans the valid period of the field image of the pilot color bar signal 1 on which the superimposition is superimposed, and detects the peak level and the line width of the luminance signal at the white level for each line. The luminance signal detection circuit 12 normally detects a white portion in the pilot color bar, but when the super is superimposed as in this case, the luminance level of the super-superimposed white character or the like is determined. In this case, the luminance level and the line width of the super portion are detected. The above-described luminance signal level and line width are supplied to the level determination unit 33 and the level display unit 47.
[0055]
Further, the color difference signal supplied from the Y / C separation circuit 10 of the video signal converter 11 is input to the color difference signal detection circuit 13. The color difference signal detection circuit 13 detects the maximum value of the color difference signal level in the line width where the peak level of the luminance signal is detected. As described above, when the luminance level of the superimposed portion is detected, the color difference signal of that portion is detected. The above-described color difference signal level is supplied to the level determination unit 33 and the level display unit 47.
[0056]
On the other hand, the audio signal supplied from the audio equalizer circuit 7 of the audio signal input unit 8 is input to the audio signal level detection circuit 14, the audio signal frequency detection circuit 15, and the audio signal phase difference detection circuit 16. .
[0057]
The audio signal level detection circuit 14 detects an audio signal level during a period during which the field image valid period of the video signal is scanned, and supplies it to the level determination unit 33 and the level display unit 47. The audio signal frequency detection circuit 15 detects an audio signal frequency during a period during which the field image valid period of the video signal is scanned, and supplies the signal to the level determination unit 33 and the level display unit 47. The audio signal phase difference detection circuit 16 detects an audio signal phase difference during a period during which the field image valid period of the video signal is scanned, and supplies the same to the level determination unit 33 and the level display unit 47.
[0058]
The timing at which the luminance signal detection circuit 12, the color difference signal detection circuit 13, the audio signal level detection circuit 14, the audio signal frequency detection circuit 15, and the audio signal phase difference circuit 16 start detection is determined by the pilot of the VTR. Since the detection has to be performed in accordance with the color bar portion, it is necessary to control the timing so that the pilot color bar signal 1 is input to the level checker. For this reason, a measurement start signal 48 is supplied from the outside in accordance with the start timing of the VTR or the like, and is input to the detection circuit start signal generator 17 to start the above-described detection circuit.
[0059]
The level determination section 33 inputs the above-described peak level of the luminance signal and the line width at that time to the luminance level determination circuit 19. The brightness level determination circuit 19 determines whether or not the peak level of the brightness signal supplied from the level detection unit 18 is larger than a set area. Normally, super white characters and the like superimposed on the pilot color bar are smaller than the white area of the normal color bar, are smaller than the set value of the white level area setting unit 20, and are canceled from the determination circuit. Even if the peak level of the signal is an abnormal value, it is not determined that the level is abnormal. At the same time, the color difference signal determination circuit 23 determines that the above-mentioned area is colorless.
[0060]
Further, before the level check, the setting that the pilot color bar signal 1 is, for example, the full field color bar of FIG. 4 or the SMPTE color bar of FIG. 5 is performed by the determination area selection circuit 32 included in the video level determination output circuit 25. By doing so, it is possible to limit in which area the white portion exists in the effective image period, and improve the accuracy of the above-described determination result. As a result, even if the super signal or the like superimposed on the pilot color bar clears the above-described area determination, it is canceled by the determination area selection circuit 32, so that the peak level of the luminance signal is abnormal. Is not determined to be abnormal. Therefore, if there is an abnormality in each level at the time of a normal pilot color bar signal, it is notified to the outside.
[0061]
The audio signal is determined by each of the audio signal level determination circuit 26, the audio signal frequency determination circuit 28, and the audio signal phase difference determination circuit 30, and is notified to the outside if there is any abnormality.
[0062]
The level display unit 47 inputs signal information supplied from the video and audio detection circuit to the display unit and controls a display such as a 7-segment LED to display a numerical value.
[0063]
【The invention's effect】
As described above, according to the present invention, it is not necessary to separately check the video signal and the audio signal, and the workability is good. It is possible to provide a level checker capable of checking whether or not a video signal level and an audio signal level are normal levels before transmitting such a material as a program.
[Brief description of the drawings]
FIG. 1 is a block diagram showing one embodiment of a level checker according to the present invention.
FIG. 2 is a system diagram of a conventional system for checking a level of a VTR or the like.
FIG. 3 is a diagram showing a configuration of a conventional tape recording such as a VTR.
FIG. 4 is a diagram showing a full-field color bar as an example of a pilot color bar of a conventional VTR or the like.
FIG. 5 is a diagram showing an SMPTE color bar as an example of a pilot color bar of a conventional VTR or the like.
FIG. 6 is a diagram showing an example of a conventional pilot color bar for a VTR or the like, in which a logo and a material number are superimposed.
[Explanation of symbols]
1 Pilot color bar signal
2 Video / audio signal separation circuit
3 Signal input section
4 Video signal equalizer circuit
5 Video signal synchronization circuit
6 Video signal input section
7 Voice equalizer circuit
8 Audio signal input section
9 Serial / parallel conversion circuit
10 Y / C separation circuit
11 Video signal converter
12. Luminance signal detection circuit
13. Color difference signal detection circuit
14. Audio signal level detection circuit
15 Audio signal frequency detection circuit
16. Audio signal phase difference detection circuit
17 Detection circuit start signal generator
18 Level detector
19. Luminance level judgment circuit
20 White level area setting section
21 White level upper / lower limit setting section
22 Peak level line memory
23 Color difference level judgment circuit
24 Color difference level upper / lower limit setting section
25 Video level judgment output circuit
26 Audio signal level judgment circuit
27 Audio level upper / lower limit setting section
28 Audio signal frequency judgment circuit
29 Audio frequency upper and lower limit setting section
30 Audio signal phase difference judgment circuit
31 Audio phase difference upper / lower limit setting unit
32 Judgment area selection circuit
33 Level judgment unit
34 Color bar setting section
35 Video output
36 Voice judgment output
37 Luminance level display
38 Display
39 Color difference level display
40 Display
41 Audio level display
42 Display
43 Audio frequency display
44 Display
45 Audio phase difference display
46 Display
47 Level display section
48 Measurement start signal

Claims (3)

A signal input unit for separating the pilot color bar signal into a video signal and an audio signal,
A video signal conversion unit that separates the separated video signal into a luminance signal and a color difference signal,
A level detection unit that detects a peak level of the luminance signal and the color difference signal, and a level of the audio signal;
A video / audio signal level checker comprising: a level determining unit that simultaneously determines whether a detected peak level of a luminance signal and a color difference signal and a level of an audio signal are normal levels. The level determination unit includes:
A color bar setting section for setting the type of the pilot color bar to be input;
A determination area selection circuit that selects a white area according to the type of the color bar set in the color bar setting unit,
The level determination unit receives information on the white area from the determination area selection circuit, and determines whether or not the peak level of the luminance signal detected by the level detection unit is a normal level, in an area different from the white area. 2. The video / audio signal level checker according to claim 1, wherein when the white area is determined, the white area is determined to be a super signal or the like, and the determination result of the level determination unit is deleted. 3. The video / audio signal level checker according to claim 1, further comprising a level display unit that displays a level of at least one of the detected luminance signal, color difference signal, and audio signal.

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