JP3518096B2 - Method of manufacturing video recording and playback equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal generator, and is effective for use in production inspection of video recording / reproducing equipment and video reproducing equipment. 2. Description of the Related Art A video recording / reproducing apparatus test method uses a video signal generator for television inspection. For that reason,
Select a video signal generator for each inspection purpose, record / reproduce the signal from the video signal generator with a video recording / reproducing device, check the image on the monitor TV, or inspect the characteristics of the video recording / reproducing device using an oscilloscope or the like. ing. The purpose and method of testing a video recording / reproducing device using a conventional video signal generator will be described with reference to the drawings. [0004] First, inspection of frequency characteristics will be described. FIG. 15 is a block diagram showing a process for inspecting and adjusting the frequency characteristics of a conventional video recording / reproducing device. 21 is a video recording / reproducing device for performing inspection adjustment, 22 is a video signal generator,
23 is a monitor TV and 24 is an oscilloscope. FIG. 16 shows a multi-burst signal monitored by a monitor T.
7 is a first screen showing a state of the image displayed on V. FIG. The multi-burst signal is a signal used for inspecting and adjusting the frequency characteristics of the video recording / reproducing device 21. The main inspection item on the first screen shown in FIG. 16 is the inspection adjustment of the frequency output characteristics of the video recording / reproducing device 21 from the low band to the high band. Next, an inspection method will be described. FIG.
It is divided into 6 blocks of A6, each block,
A1 is 0.5 MHZ, A2 is 1.25 MHZ, A3 is 2.0 MHZ, A4
Indicates a frequency of 3.0 MHz, A5 indicates a frequency of 3.58 MHz, and A6 indicates a frequency of 4.1 MHz. As is clear from FIG. 16, the frequency is higher as the interval between the vertical lines is smaller. When the multi-burst signal output from the video signal generator 22 is confirmed by the oscilloscope 24, the result is as shown in FIG. here,
The state in which the blocks A1 to A6 in FIG. 16 viewed on the monitor TV 23 are projected on the oscilloscope 24 is shown in FIG.
1 to A6. When the multi-burst signal output from the video signal generator 22 is recorded / reproduced by the video recording / reproducing device 21 and its waveform is projected by the oscilloscope 24, FIG.
8, the characteristic level of the video recording / reproducing apparatus 21 can be inspected by checking the magnitude of the waveform amplitude level of each of the blocks A1 to A6. For example, block A1 in FIG.
00%, and the block A3 in FIG.
The characteristics of the video recording / reproducing device 21 can be checked by confirming whether it is within ± 20%. Second, an inspection using a color bar signal and a monoscope signal will be described. FIG. 19 is a block diagram showing an inspection process using a color bar signal and a monoscope signal of a conventional video recording / reproducing apparatus. 25 is a video signal generator. FIG. 20 is a second screen showing a state where the color bar signal is projected on the monitor TV. The color bar signal of the second screen shown in FIG. 20 is a signal for inspecting the color phase of the video recording / reproducing device and inspecting the color signal for puckiness, beat, and the like. Next, the inspection method will be described. The SW of FIG. 20 is switched to the color bar signal side, and the video signal generator 25 is switched.
The color bar signal output from the
1 recorded and played back in FIG. 2 and shown on the monitor TV23.
The hue and beat of the recorded / reproduced image of the portion B1 of 0 are confirmed, and the color difference is confirmed and inspected. FIG. 21 is a diagram showing a state in which the color bar signal output from the video signal generator 25 is recorded and reproduced by the video recording and reproducing device 21 and is projected on the monitor TV 23, and is a luminance-based reference signal called an IQ signal. A check is made to see if there is any noise or beats from the switching power supply. FIG. 22 is a screen showing a state in which a color bar signal is recorded and reproduced by a video recording and reproducing device and displayed on a monitor TV. The dashed-dotted lines indicated by C1 and C2 in FIG. 22 indicate the boundary between the IQ signal and the white (100%) signal or the white (100%) signal.
%) And the boundary of the black signal, such as the boundary of the black signal, showing the portion where the signal has changed abruptly.
The reproducibility of the signal recorded / reproduced by the video recording / reproducing device 21 and the monitor TV 23 is checked for reproducibility. For example, as shown in FIG. 22, if black and white horizontal streaks can be confirmed in the image on the monitor TV 23, it can be determined that the reproducibility of the video recording / reproducing device 21 is poor. The reason for this is as shown in FIG. 23 when the waveform of C1 to C2 in FIG. 22 is projected by an oscilloscope, as shown in FIG. (Overshoot), horizontal streak noise is generated at the boundary of the screen of the monitor TV 23, and it can be determined whether or not reproducibility is poor. FIG. 24 shows a monitor T
13 is a third screen showing a state of the image displayed on V. FIG. The main inspection items of the monoscope signal are horizontal resolution, S /
N, a signal for performing inspection of tailing noise (at the boundary between black and white, the original signal is white but the black tail is drawn and the white portion becomes black). Next, the inspection method will be described. FIG. 25 shows FIG.
Is switched to the monoscope signal side, and the monoscope signal output from the video signal generator 25 is recorded and reproduced by the video recording / reproducing device 21 and is enlarged on the portion D1 shown in FIG. FIG. In FIG. 25, the horizontal resolution can be confirmed, and the confirmation inspection of the sharpness of the vertical line, the horizontal stripe noise, and the like can be performed. FIG. 26 is an enlarged view of a portion D2 shown in FIG. 24 in a state where the monoscope signal of FIG. 24 output from the video signal generator 25 is recorded and reproduced by the video recording / reproducing device 21 and projected on the monitor TV 23. FIG. This figure 2
In No. 6, the tailing can be confirmed and the boundary between black and white can be confirmed and inspected. As is clear from the above description, in the product inspection for judging the quality of the conventional video recording / reproducing device, the video signal generator 22 for outputting the first screen of FIG.
24 and the video signal generator 25 for outputting the third screen in FIG. 24 are used separately for each inspection item. Next, a description will be given of a method of inspecting a video reproducing device. The inspection method of the video playback device is based on three types of video signals used in the inspection of the video recording / playback device (the first screen in FIG. 16, the second screen in FIG. 20, and the third screen in FIG. 24). Was reproduced in advance from a magnetic tape or a disk recorded in advance, and the reproduced image was inspected and confirmed with a monitor TV and an oscilloscope in the same manner as in the above-described video recording / reproducing apparatus. However, in the above-described conventional configuration, for each test item of the video recording / reproducing device, the signals from the video signal generators 22 and 25 corresponding to the test item are recorded and reproduced. The video signal was recorded by the device 21 and the reproduced signal from the video recording / reproducing device 21 was inspected by the monitor TV 23 and the oscilloscope 24. The inspection items included 20 items shown in Table 1 and required 3 items. It required a different kind of video signal generator and an oscilloscope. [Table 1] An object of the present invention is to provide a video signal generator capable of shortening the inspection time of the above-mentioned conventional method and facilitating a product inspection procedure by using only one type of signal generator. A video recording / reproducing apparatus according to the present invention.
The method of manufacturing the device is based on the video output from the video signal generator.
Record the input signal and monitor the recorded video output signal
A method for manufacturing a video recording / reproducing device for reproducing on a TV,
The video output signal is at least at the top of the monitor screen
Color bar signal output only on the monitor
Including other signals output and displayed other than the top
ー The color of the color bar signal output and displayed at the top of the screen
An inspection step for confirming the presence or absence of disturbance is provided. With this configuration, a color bar signal, a multiburst signal, and a vertical line can be output and displayed on one monitor screen, and recorded as one pattern signal, and a reproduced image can be confirmed. To determine the quality of the product, and the product characteristic level without using an oscilloscope. (Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of a video signal generator according to the present invention. In FIG. 1, 31
Is a synchronization signal generator, 32 is an address counter, 33 is a horizontal counter, 34 is a vertical counter, 35 is a first memory, 36 is a second memory, 37 is a line memory, and 38 is a first D / A converter. , 39 is a second D / A converter, 40 is a third D / A converter, and 41 is an adder. The synchronization signal generated by the synchronization signal generator 31 is input to an address counter 32, and the address counter 32 outputs a reference pulse of a horizontal synchronization signal. At the same time, based on the horizontal counter 33 and the vertical counter 34, the video signal is stored as a single image with a capacity of 1820 sample pulses in the horizontal direction and 525 bytes in the vertical direction, and constitutes the memory of the pattern signal required. ing. The color signal is stored in the line memory 37 with 1820 sample pulses based on the horizontal counter 33,
The synchronizing signal, video signal, and color signal output from the first memory 35, the second memory 36, and the line memory 37 are output to the first D / A converter 38, the second D / A converter 39, After each of the three D / A converters 40 performs the D / A conversion, the adder 41 performs the integration and outputs the result as a video output signal. FIG. 2 is a fourth screen showing a state in which the video output signal output from the video signal generator of this embodiment is output to the monitor TV. The concept of an example of pattern arrangement on the fourth screen output by the video signal generator of this embodiment will be described below. First, in the color inspection, a color bar is arranged at the top of the screen of the monitor TV. Since the rising of the video and the color signal rises from the upper left when output to the monitor TV, the color signal is arranged at the uppermost part and it is checked whether or not the color is disturbed. Second, the frequency setting of the multiburst is as follows:
Characteristic frequency of video recording / reproducing equipment (VHS-VTR is about 2
(MHz). Third, since the video recording / reproducing device is based on the horizontal synchronizing signal, a vertical line from the upper part to the lower part of the screen is used to check the fluctuation of the horizontal synchronizing signal by the mechanical control of the video recording / reproducing device. Insert Next, FIG. 3 shows an inspection (frequency characteristic inspection and recording / reproduction inspection) process of a video recording / reproducing device using the video signal generator of the present embodiment. In the figure, reference numeral 21 denotes a video recording / reproducing device for inspection and adjustment; 23, a monitor TV; and 26, a video signal generator of the present embodiment. The video signal generator 26 has the configuration of FIG. 1 and outputs a video output signal corresponding to the fourth screen shown in FIG. Video recording and playback equipment 2
1 records the input video output signal, reproduces it, and displays it on the monitor TV 23 as a reproduced output. Table 2 shows how to view the fourth screen output to the monitor TV shown in FIG. [Table 2] Hereinafter, the signal names and the inspection contents will be described using the fourth screen. FIG. 4 is an enlarged view of a checkerboard signal portion which is a main part of the fourth screen of FIG. By arranging the checkered pattern 1 composed of black and white signals on both left and right sides of the screen,
Since it is before and after the horizontal synchronizing signal, the tailing noise can be confirmed by the tailing amount immediately next to the checkered pattern 1. In addition, the circuit for separating the horizontal synchronizing signal and the circuit for clamping the level can be checked based on the amount of tailing right beside the checkered pattern 1. FIG. 5 is an enlarged view of a black vertical line signal portion which is a main part of the fourth screen of FIG. By inserting one black vertical line 2 from the top to the bottom of the center of the screen with respect to the white screen 6, it is possible to detect jitter and screen shaking when the running system is unstable. Also, by setting the line type to 2T pulse (corresponding to two scanning lines), it is possible to check the screen with the frequency changed from low to high, and check the frequency characteristics by seeing how the lines bleed. I can do it. FIG. 6 is an enlarged view of a ramp signal portion which is a main portion of the fourth screen of FIG. By displaying the ramp signal 4, when confirming bit omission at the time of digital conversion, it is possible to confirm all signals from the low band to the high band that have changed linearly as frequency. For example, when a bit is dropped, a horizontal streak appears. FIG. 7 is an enlarged view of a flesh color portion which is a main part of the fourth screen of FIG. The skin color 5 is the most easily visible hue confirmation screen and the hue where the difference is clearly visible.
By checking the color of this block, an accurate hue can be determined. FIG. 8 is an enlarged view of a 100% white portion, which is a main part of the fourth screen of FIG. By inserting the black vertical line 18 into the 100% white signal 19, the rising characteristics of white → black → white can be understood, and it can be determined by the amount of tailing noise at the edge of the black vertical line 18. FIG. 9 shows the main part of the fourth screen shown in FIG.
It is an enlarged view of a Q signal part. The I signal 8 and the Q signal 7 are signals serving as phase references, and can be used for inspection of SW noise by checking for the presence or absence of white-spot noise. FIG. 10 is an enlarged view of a circular signal portion which is a main part of the fourth screen of FIG. The circular signal 9 can be determined by the sharpness of the edge of the circular curved portion when confirming the high image quality circuit. FIG. 11 is an enlarged view of a color bar signal portion which is a main part of the fourth screen of FIG. Color bar signal 1
0 is located at the top of the screen. This is because the rise of the color signal rises from the upper left, so that the color disappears easily and the judgment is easy. As another inspection, inspection for hue and color breakage is performed. FIG. 12 is an enlarged view of a white signal portion which is a main part of the fourth screen of FIG. The confirmation method is that the color bar signal 10 is a magenta color. 100% of white 1 in it
An inspection is performed to determine whether the color of the magenta 10 is not blurred in the portion 1. FIG. 13 is an enlarged view of a multi-burst signal portion which is a main part of the fourth screen of FIG. The frequency setting of the multiburst signal 14 is 0.8 MHz, 1.0 MHz from the upper left.
Z, 1.4MHZ, 1.6MHZ, 1.8MHZ, move to lower left, 2.0MH
Z, 2.5 MHZ, 3.0 MHZ, 3.5 MHZ, and 4.0 MHZ are set. As a method of inspecting the frequency characteristics, it can be determined by the sharpness of the image. For example, as shown in the enlarged view of FIG. By setting the frequency in detail according to the video recording / reproducing device, a highly accurate frequency characteristic inspection can be performed. As described above, it can be adapted to the product characteristics of the video recording / reproducing device. For example, a VHS-VTR can set a frequency around 2 MHz. FIG. 14 is an enlarged view of a character signal portion which is a main part of the fourth screen of FIG. By checking the character signal 16, whitening occurs in the black portion, and the sharpness of the character can be determined. As described above, the video signal generator of the present invention outputs and displays a color bar signal at the top of the monitor screen, and outputs and displays a multi-burst signal at a position other than the top of the monitor screen. Means, and a means for outputting and displaying a vertical line at least at the center of the monitor screen, it is possible to output and display a color bar signal, a multi-burst signal, and a vertical line on one monitor screen, 1
The quality of the product can be determined by recording as one pattern signal and confirming the reproduced image, the product characteristic level can be determined without using an oscilloscope, shortening the inspection time, and selecting one type of signal generator. This makes it possible to facilitate the product inspection procedure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of an embodiment of a video signal generator according to the present invention. FIG. 2 is a schematic diagram of a screen in a state where a signal output according to the embodiment is output to a monitor TV. FIG. 3 is an inspection process diagram using the embodiment. FIG. 4 is an enlarged view of a main part of FIG. 2 of the embodiment. FIG. 5 is an enlarged view of a main part of FIG. 2 of the embodiment. FIG. 7 is an enlarged view of a main part of FIG. 2 of the embodiment. FIG. 8 is an enlarged view of a main part of FIG. 2 of the embodiment. FIG. 9 is an enlarged view of FIG. 2 of the embodiment. FIG. 10 is an enlarged view of a main part of FIG. 2 of the embodiment. FIG. 11 is an enlarged view of a main part of FIG. 2 of the embodiment. FIG. 12 is an enlarged view of a main part of FIG. 2 of the embodiment. FIG. 13 is an enlarged view of a main part of FIG. 2 of the embodiment. FIG. 14 is an enlarged view of a main part of FIG. 2 of the embodiment. FIG. 16 Conventional inspection FIG. 17 is a schematic diagram of a screen in which a multi-burst signal in a process is output to a monitor TV. FIG. 17 is a schematic diagram output to an oscilloscope in a conventional inspection process. FIG. 18 is a schematic diagram output to an oscilloscope in a conventional inspection process. FIG. 20 is a block diagram showing a process of inspecting and adjusting a conventional video recording / reproducing apparatus. FIG. 20 is a schematic view of a screen in which a color bar signal in a conventional inspection process is output to a monitor TV. FIG. FIG. 22 is a schematic diagram of a screen in which a bar signal is output to a monitor TV. FIG. 22 is a schematic diagram of a screen in which a color bar signal is output to a monitor TV in a conventional inspection process. FIG. 23 is output to an oscilloscope in a conventional inspection process. FIG. 24 shows a state in which a monoscopic signal in a conventional inspection process is output to a monitor TV. FIG. 25 is a schematic diagram of a screen in which a monoscope signal in a conventional inspection process is output to a monitor TV. FIG. 26 is a schematic diagram of a screen in which a monoscope signal in a conventional inspection process is output to a monitor TV. Schematic diagram [Description of symbols] 2 Black vertical line 10 Color bar signal 14 Multiburst signal 26 Video signal generator

──────────────────────────────────────────────────の Continuing on the front page (72) Yoshikazu Okabe 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. In-company (56) References JP-A-6-319158 (JP, A) JP-A-5-316474 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 17/00

Claims (1)

(57) [Claim 1] Video output output by a video signal generator
Record the signal and monitor the recorded video output signal
-A method of manufacturing video recording / reproducing equipment for reproduction on TV.
The video output signal is at least
Color bar signal output and displayed only at the top and the monitor
-Includes other signals output and displayed other than at the top of the screen.
Look, color bar output displayed at the top of the monitor screen
Video with an inspection process to check for signal color disturbance
Manufacturing method of recording / reproducing equipment.