JPH01271967A - Reproducing output inspecting device - Google Patents

Abstract

PURPOSE:To reduce inspection cost and to unify the quality of shipping tapes by providing a signal dropout state detecting means and a means to generate a dropout qualification output when a signal dropout time is a prescribed time or above. CONSTITUTION:A recorded soft tape 1 is reproduced by a reproducing device 2 for inspection and a DC waveform signal 5 is peak-held from a reproducing signal 3 by a detecting circuit 4. At this time, when there is a dropout 3a in the reproducing signal 3, a dropout 5a of a fair time width occurs also in the DC waveform signal 5. A comparing circuit 8 compares the dropout 5a with the width of a width 7a of a pulse signal 7 of a fixed time width made by a pulse generating circuit 6. When the dropout 5a is larger than the pulse width 7a, a DC output signal 9 is outputted, a call lamp 10 is turned on and an emergency stop switch 11 is operated. The inspecting device 2 is stopped. By this constitution, the number of inspectors is decreased, the dispersion of inspection levels is also decreased and the soft tapes of uniform quality can be shipped.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a playback output testing device for testing the recording state of recorded recording media such as video tapes, audio tapes, compact discs, video discs, and the like.

2. Description of the Related Art In recent years, with the spread of recording and reproducing apparatuses such as video tape recorders, the demand for recorded tapes (hereinafter referred to as soft tapes) has rapidly increased. Furthermore, as the image quality of recording and reproducing devices becomes higher, demands on the quality of soft tapes are also becoming stricter. Among the image quality defects, a particularly easily occurring and noticeable defect is noise due to signal dropout (hereinafter referred to as dropout), which is mainly caused by defects in the raw tape.

For this reason, conventionally, a large amount of recorded soft tape has been played back one roll at a time, and dropouts on the playback screen have been visually inspected. In the case of long-duration soft tapes such as movies, it takes an enormous amount of time to inspect the entire length of the recorded tape, so the inspection time can be reduced by performing three-point inspections at the beginning, middle, and end, or sampling inspections. was going on.

Problems to be Solved by the Invention However, in the case of conventional inspection methods, an enormous amount of inspection time and a large number of inspection personnel are required, and not only does the inspection cost become enormous, but also the subjectivity of the inspector There was a major problem in that it was difficult to maintain uniform quality of the soft tapes being shipped, as the inspection level varied due to variations and defects were overlooked.

Therefore, the present invention solves the conventional problems, significantly reduces inspection costs by minimizing the number of inspectors, and eliminates variations in inspection levels to ship soft tapes that maintain uniform quality. The purpose of this invention is to provide a playback output testing device that can perform the following tasks.

Means for Solving the Problems The playback output testing device of the present invention includes a detection means for detecting a signal loss state of a playback signal from a recording medium on which a video signal or an audio signal has been recorded, and a signal of a detection signal from the detection means. The present invention is characterized in that it includes an output means that generates a recognition output as a dropout when the dropout time exceeds a predetermined amount.

The playback output testing device of the present invention also includes a detection means for detecting a signal dropout state of a playback signal from a recording medium on which a video signal or an audio signal has been recorded, and a signal dropout period of a detection signal from the detection means for a predetermined amount of time. an output means that generates a certified output as a dropout when the above occurs, and a device that determines whether or not the playback signal is present after a certain period of time has elapsed after generation of the certified output from the output means, and when the playback signal is present. The present invention is characterized in that it includes a discriminating means that generates an abnormality indication signal only at the terminal.

Furthermore, the playback output testing device of the present invention includes a detection means for detecting a signal dropout state of a playback signal from a recording medium on which a video signal or an audio signal has been recorded, and a signal dropout time of the detection signal from the detection means for a predetermined amount of time. Output means that generates a certified output as a dropout when the above occurs, and determines the presence or absence of the reproduced signal after a certain period of time has elapsed after generation of the certified output from this output means, and only when the reproduced signal is present. The apparatus is characterized in that it includes a determining means for generating an abnormality indication signal when the reproduced signal is not present, and generating an inspected indication signal when the reproduced signal is absent.

Function: The playback output testing device of the present invention plays back a recorded recording medium in a testing playback device, detects the signal dropout time of the video playback signal or audio playback signal, and detects the signal dropout time by a predetermined amount. In order to reproduce the certified output as a dropout when the above occurs, the call lamp is controlled by this certified output, and the recording medium is controlled to stop the playback device of the recorded recording medium. It is possible to determine whether a finished recording medium is good or bad.

Further, after a predetermined period of time has elapsed after generation of the certified output from the output means, the presence or absence of the video playback signal or the audio playback signal is determined, and the abnormality instruction signal is generated only when the video playback signal or the audio playback signal is present. If this abnormality instruction signal causes a malfunction display such as lighting of a call lamp, the recorded recording medium is stopped and the recorded recording medium is ejected. It is possible to accurately determine whether the product is good or bad.

Furthermore, since the determination means outputs a tested indication signal when there is no video playback signal or audio playback signal (when there is no abnormality in the recording state of the recording medium and the playback signal disappears after reaching the end of recording), this test By lighting the inspected lamp in response to the inspection completion instruction signal, it is possible to more accurately determine the quality of the recorded recording medium.

Example An embodiment of the present invention will be described with reference to FIG.

The recorded soft tape 1 is played back by the testing playback device 2. A peak-held DC waveform signal 5 is obtained from the video RF signal 3 reproduced by the test reproduction device 2 by the peak detection circuit 4. At this time, if there is a dropout 3a in the video RF signal 3, a missing portion 5a having a time width corresponding to the time of the dropout 3a also occurs in the DC waveform signal 6. A comparator circuit 8 compares the time width of the missing portion 5a of the DC waveform signal 6 and the pulse width 7a of the pulse waveform signal 7 with a constant time width generated by the pulse generation circuit 6, If it is larger, the comparator circuit 8 generates a DC output signal 9.

Then, the call lamp 1° is turned on by the DC output signal 9 from the comparison circuit 8, and the emergency stop switch 11 of the test playback device 2 is operated to stop the test playback device 2.

FIG. 2 shows a second embodiment of the invention. In FIG. 2, a recorded soft tape 1 is played back by a testing playback device 2. In FIG. A peak-held DC waveform signal 6 is obtained from the video RF signal 3 reproduced by the test reproduction device 2 by the peak detection circuit 4. At this time, if there is a drop error 3a in the video RF signal 3, a missing portion 6a having a time width corresponding to the time of the drop error 3a also occurs in the DC waveform signal 6. Missing portion 5a of DC waveform signal 5
A comparison circuit 8 compares the time width of the pulse width 7a of the pulse waveform 7 with a constant time width generated by the pulse generation circuit 6, and if the missing portion 5a is larger than the pulse width 7a, the comparison circuit 8 determines that the DC Generates an output signal 9. On the other hand, several seconds after the DC output signal 9 is generated, the video RF
The presence or absence of the signal 3 is determined by a discrimination circuit 12, and the abnormality instruction signal 13 is outputted from the discrimination circuit 12 only when the video RF signal 3 is present. The call lamp 10 is turned on by the abnormality instruction signal 13 outputted from the discrimination circuit 12, and the stop switch 11 of the test playback device 2 is operated to bring the test playback device 2 into a stopped state.

At this time, the discrimination circuit 12 discriminates between a dropout and the end of playback (end of recorded program), so if there is no abnormality (dropout of a certain amount or more) in the playback signal (recording state), the After completion, no abnormality is displayed, and the next soft tape can be continuously played (inspected).

FIG. 3 shows a third embodiment of the present invention. In FIG. 3, a recorded soft tape 1 is played back by a testing playback device 2. In FIG. A peak-held DC waveform signal 6 is obtained from the video RF signal 3 reproduced by the test reproduction device 2 by the peak detection circuit 4. At this time, if there is a drop error 3a in the video RF signal 3, a missing portion 5a having a time width corresponding to the time of the drop error 3a also occurs in the DC waveform signal 6. Missing portion 5a of DC waveform signal 6
A comparator circuit 8 compares the time widths of the pulse waveform 7 and the pulse cap of the pulse waveform 7 with a constant time width generated by the pulse generation circuit 6, and if the omission 5 is larger than the pulse width 7a, the comparator circuit 8 Generates an output signal 9. On the other hand, several seconds after the DC output signal 9 is generated from the comparison circuit 8, the discrimination circuit 12 determines whether or not the video RF signal 3 is present, and when the video RF signal 3 is present, the abnormality instruction signal 13
Output. The call lamp 10 is turned on in response to the output abnormality instruction signal 13, and at the same time, a defect is recorded in a recording device 14 such as a pen recorder, and the ejection switch 11 of the test playback device 2 is operated to remove the test playback device 2. The soft tape 1 is discharged from the holder. Also, the video R
When there is no F signal 3, it is determined that the soft tape 1 has reached the recording end, and an inspected indication signal 15 is output, the inspected lamp 16 is turned on, and the inspected status is recorded in the recording device 14. Then, the soft tape 1 is discharged from the inspection playback device 2.

Effects of the Invention According to the playback output testing device of the present invention, dropouts in a recorded recording medium are automatically detected, and the detection rate can also be set freely. Therefore, there is no variation in detection level due to differences in inspectors as in the past, and not only can we supply soft tapes and soft decks that always maintain uniform quality, but there is no need for inspectors to monitor the playback screen. Since it is possible to manage a large number of inspection reproducing machines, it is possible to significantly reduce the number of inspectors (reducing inspection costs). Furthermore, if a changer is attached to the inspection playback machine that automatically ejects the software when one playback is completed and inserts the first software, continuous and automatic tests can be performed. It is also possible to make the test unmanned.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are overall block diagrams of a reproduction output testing apparatus according to an embodiment of the present invention. 1... Soft tape, 2... Test playback device, 3... Video RF signal, 4...
・Peak detection circuit, 6...DC waveform, 5a...
... Missing part, 6... Pulse generation circuit, 7.
...Pulse waveform, 8...Comparison circuit, 10
...... Call lamp, 11... Ejection switch, 12... Discrimination circuit, 13... Abnormality display signal, 14... Recording device, 16...
...Inspected display signal. Name of agent: Patent attorney Toshio Nakao and one other name
1 Ward Map 2

Claims (6)

[Claims] (1) A detection means for detecting a signal dropout state of a playback signal from a recording medium on which a video signal or an audio signal has been recorded, and a dropout when the signal dropout time of the detected signal from this detection means exceeds a predetermined amount. What is claimed is: 1. A reproduction output inspection device characterized by comprising: an output means for generating a certified output. (2) The playback output testing device according to claim 1, further comprising means for stopping a call lamp or a playback device for a recorded recording medium whose operation is controlled by the certified output from the output means. (3) A detection means for detecting a signal dropout state of a playback signal from a recording medium on which a video signal or an audio signal has been recorded, and a dropout when the signal dropout time of the detection signal from this detection means exceeds a predetermined amount. an output means for generating a certified output as the output means; and determining the presence or absence of the reproduced signal after a certain period of time has elapsed after the generation of the certified output from the output means;
A reproduction output testing device characterized by comprising: determination means for generating an abnormality instruction signal only when the reproduction signal is present. (4) The playback output testing device according to claim 3, further comprising means for stopping a call lamp or a playback device for a recorded recording medium whose operation is controlled by an abnormality instruction signal from the determination means. (5) A detection means for detecting a signal dropout state of a playback signal from a recording medium on which a video signal or an audio signal has been recorded, and a dropout when the signal dropout time of the detection signal from this detection means exceeds a predetermined amount. an output means for generating a certified output as a certified output, and determining the presence or absence of the reproduced signal after a certain period of time has elapsed after generation of the certified output from the output means, and generating an abnormality instruction signal when the reproduced signal is present; A playback output testing device characterized by comprising: determining means for generating a test completion indication signal when the playback signal is not present. (6) The playback output test according to claim 5, characterized in that the playback device for the recorded recording medium is stopped by an instruction signal from the determining means, and the recording medium is ejected from the playback device. Device.