KR19990042797A - Apparatus and method for inspecting abnormality of video cassette recorder set - Google Patents

Abstract

The present invention relates to an apparatus and method for checking an abnormality of a video cassette recorder for automatically performing a process of inspecting an abnormality of a video cassette recorder set before being shipped from a production line.

To this end, the present invention sets the video cassette recorder set to be tested to the playback state, detects the envelope value (or the envelope value of the audio signal, or the number of control signals) of the video signal and envelopes the detected video signal. The envelope state (or the number of control signals detected in a normal state) when the value (or the envelope value of the audio signal or the number of control signals) is preset, that is, when the video cassette recorder set is in a normal state. If it is the same, it is determined that the video cassette recorder set to be tested is normally played with respect to the video signal (or audio signal or control signal), and an OSD message indicating the normal state is displayed on the screen, and the envelope value (or Envelope value or control of audio signal If the number of roll signals) is not the same as the preset video signal (or the envelope value of the audio signal or the number of control signals), the video cassette recorder set that is currently being tested is used for the video signal (or audio signal or control signal). By determining an abnormal playback and displaying an OSD message indicating an abnormal state on the screen, the tester does not check a plurality of test signals one by one but examines only an abnormal state signal, thereby reducing test time.

Description

Apparatus and method for checking abnormality of video cassette recorder set

The present invention relates to an apparatus and method for inspecting a set state of a video cassette recorder, and more particularly, to automatically perform a process for inspecting an abnormality of a video cassette recorder set before being shipped out at a production line stage. The present invention relates to an apparatus and method for inspecting a video cassette recorder for abnormalities.

As is well known, a video cassette recorder in many homes uses a head to record a composite video signal from a tuner tuned to a desired channel among broadcast signals received through an antenna, or to record on a magnetic tape from an external source. It has a recording function for recording the input video signal to the magnetic tape through the head, and a playback function for reproducing the composite video signal recorded on the magnetic tape and displaying it on a monitor of a television through the above-described process. Allows you to watch the program you want to watch.

A video cassette recorder having such a function checks for an abnormality of the video cassette recorder set in the production process before leaving the factory.

That is, after checking whether there is an abnormality in the produced video cassette recorder set before leaving the video cassette recorder in the production line, if the abnormal state is not detected, the video cassette recorder is released.

At this time, the process of checking the abnormality of the video cassette recorder set before leaving the production line is as follows. After the inspector sets the finished video cassette recorder set to the playback state, the video cassette recorder is checked by checking whether the signals to be played back, that is, the output state of the video signal and audio signal, and also the control signal (CTL), that is, the normal signals, are output. The set itself was examined for abnormalities.

As described above, the conventional video cassette recorder set has an inconvenience check that the inspector checks.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problem, and an object of the present invention is to conveniently check for an abnormality of a video cassette recorder set at the production line stage before the video cassette recorder is shipped, thereby conveniently detecting an abnormality of the video cassette recorder set. The present invention provides an apparatus and method for inspecting whether a video cassette recorder set has an abnormality.

An apparatus for abnormality of a video cassette recorder set according to the present invention for achieving the above-mentioned object is characterized in that the abnormality of the video cassette recorder set for checking the presence or absence of an abnormal state from a signal provided from a video cassette recorder set in a playback state. An apparatus for checking for presence, comprising: a control signal detector for detecting and providing a number of control (CTL) signals among reproduction signals of the video cassette recorder set; A video signal envelope detector for detecting and providing an envelope value of a video signal among reproduction signals of the video cassette recorder set; An audio signal envelope detector for detecting and providing an envelope value of an audio signal among reproduction signals of the video cassette recorder set; If the number of control signals provided by the control signal detector is the number of control signals in a normal signal state, a message indicating that the control signal is in a normal state is displayed on the screen, and the video signal envelope detector and the audio signal envelope detector are provided. A microcomputer that displays a message indicating that the video signal and the audio signal are in a normal state when each envelope value is equal to each envelope value detected in a preset normal state; And an OSD unit for displaying a text font indicating a state of a control signal, a video signal, and an audio signal at a corresponding position on the screen according to the control of the microcomputer.

Another aspect of the present invention for achieving the above object is a method for inspecting an abnormality of a video cassette recorder set, the method for testing the video cassette recorder set with a tape inserted in the video cassette recorder set. Reproducing the tape when a key signal is provided; A second step of displaying an OSD menu screen for checking whether there is an abnormality in a playback signal of the tape; A third step of determining a type of a test signal selected from the OSD menu screen of the second step; A fourth step of detecting an envelope value of the corresponding signal if the type of the test signal selected in the third step is a video signal or an audio signal; If the envelope value of the selected signal is equal to the preset steady state envelope value, a message indicating that the video signal or the audio signal is in a normal state is displayed on the screen, and the envelope value of the selected signal is the same as the preset normal state envelope value. Otherwise, displaying a message indicating that a video signal or an audio signal is in an abnormal state on a screen; A sixth step of detecting the number of control signals from the reproduced signal if the type of the signal selected in the third step is a control signal; If the number of the detected control signal is the number of control signals detected from the normal signal, a message about the normal state is displayed on the screen, and if the number of the detected control signal is not the number of control signals detected from the normal signal, the abnormal state A seventh step of displaying a message on the screen.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

1 is a block diagram showing the configuration of an apparatus for checking abnormality of a video cassette recorder set;

2 is a flowchart for performing a method of checking a video cassette recorder set for abnormality.

<Description of Symbols for Main Parts of Drawings>

10: video cassette recorder set

100: Video cassette recorder abnormality inspection device

110: CTL signal detector

120: video signal envelope detector

130: audio signal envelope detector 140: micom

150: OSD unit

Hereinafter, with reference to the accompanying drawings will be described in detail the operation of the preferred embodiment according to the present invention.

1 is a block diagram showing the configuration of the apparatus for checking the abnormality of the video cassette recorder set according to the present invention, wherein reference numeral 10 denotes a video cassette recorder set, and reference numeral 100 denotes an apparatus for detecting the abnormality of the video cassette recorder set. .

At this time, the abnormality detection device 100 of the video cassette recorder set and the control signal detector 110 for detecting and providing the number of the control signal from the playback signal provided when the video cassette recorder set 10 is in the playback state; The envelope value of the audio signal from the video signal envelope value detector 120 and the playback signal provided from the video cassette recorder set 10 that detect and provide the envelope value of the video signal from the playback signal provided from the video cassette recorder set 10. If the number of control signals provided by the audio signal envelope value detector 130 and the control signal detector 110 provided by detecting the number of control signals detected in a normal state, the OSD (On Screen Display) indicating that the control signal is in a normal state ) Provides a control signal for displaying a message on the screen, and a video signal If each envelope value provided by the envelope detector 120 and the audio signal envelope detector 130 is equal to the envelope value in each preset normal state, an OSD message indicating that the video signal and the audio signal are normal is displayed on the screen. The microcomputer 140 provides a control signal for controlling the OSD, and the OSD unit 150 displays a corresponding letter on the screen according to the control of the microcomputer 140.

A detailed description of the operation of the apparatus for detecting an abnormality of the video cassette recorder set according to the present invention configured as described above is as follows.

That is, a video signal, an audio signal, and a control signal for reproducing the tape by inserting the tape into the video cassette recorder set 10 immediately before shipping are reproduced.

At this time, the control signal detector 110 detects the number of control signals from the reproduced signal and provides the detected number of control signals to the microcomputer 140.

That is, the microcomputer 140 is currently testing if the number of control signals detected from the normal state of the control signals provided from the control signal detection unit 110, that is, the number of control signals once every 1/30 second is detected. The video cassette recorder set 10 determines that the control signal is normally reproduced, and provides the OSD unit 150 with a control signal for displaying an OSD message on the screen indicating that the control signal is in a normal state.

In addition, the microcomputer 140 sets the video cassette recorder currently being tested when the envelope values provided by the video signal envelope detector 120 and the audio signal envelope detector 130 are equal to the respective envelope values in a predetermined normal state. It is determined that the video signal and the audio signal are normally reproduced by the 10, and the OSD unit 150 provides a control signal for displaying an OSD message on the screen indicating that the video signal and the audio signal are in a normal state.

Accordingly, the OSD unit 150 displays the character font under the control of the microcomputer 140 at the corresponding position on the screen.

FIG. 2 is a flowchart for performing a method for checking an abnormality of a video cassette recorder set according to the present invention, which will be described in detail with reference to the block diagram shown in FIG.

First, when the tape is inserted into the video cassette recorder set 10 to be tested in step 200, the microcomputer 140 proceeds to step 201 to test the video cassette recorder set 10 through the key input unit (not shown). When a signal for the key is provided, it is driven in a reproducing mode which reproduces the signal recorded on the inserted tape.

At this time, the microcomputer 140 proceeds to step 202 and controls the OSD unit 150 to display an OSD menu on the screen for selecting a type of signal to be tested, and proceeds to step 203 to select a selected test signal. Determine the type of.

That is, if the type of the test signal selected in operation 203 is a video signal or an audio signal, the microcomputer 140 proceeds to operation 204 and the video signal envelope and audio signal envelope detector 130 provided by the video signal envelope detector 120. In step 205, it is determined whether or not the audio signal envelope value provided by the same value is equal to the envelope value detected in a predetermined normal state.

As a result of the determination, if the envelope values provided by the video signal envelope detector 120 and the audio signal envelope detector 130 are the same as the envelope values detected in the preset normal state, the process proceeds to step 206 and the video cassette recorder currently tested. The set 10 determines that the video signal and the audio signal are normally reproduced, and provides a control signal to the OSD unit 150 for displaying a message indicating that the video signal and the audio signal are in a normal state.

At this time, the microcomputer 140 currently tests the video cassette recorder when the envelope values provided by the video signal envelope detector 120 and the audio signal envelope detector 130 are not equal to the envelope values detected in a predetermined normal state. The set 10 determines that the video signal and the audio signal are abnormally reproduced so that a message indicating that the video signal and the audio signal are abnormal is displayed on the screen.

Accordingly, the OSD unit 150 displays a text font indicating that the video signal and the audio signal are in a normal state or an abnormal state under the control of the microcomputer 140 at a corresponding position on the screen.

On the other hand, if the type of the test signal selected in step 203 is a control signal (step 208), the microcomputer 140 proceeds to step 209 to detect the number of control signals provided from the control signal detector 110 in a normal state. It is determined whether the number of control signals.

As a result of the determination, if the number of control signals provided by the control signal detection unit 110 is the number of control signals detected in a normal state, the video cassette recorder set 10 under test is judged to be normally playing the control signals. The display proceeds to step I to display a message indicating that the control signal is in a normal state.

In addition, if the number of control signals provided by the control signal detector 110 is not the number of control signals detected in a normal state, the microcomputer 140 may abnormally control the video cassette recorder set 10 that is currently being tested. If it is determined that the video signal is being reproduced, the flow proceeds to step 207 to display a message indicating that the control signal is in an abnormal state on the screen.

As described above, the apparatus and method for checking the abnormality of the video cassette recorder set according to the present invention includes setting the video cassette recorder set to be tested to the playback state, and then encoding the video signal (or the envelope value of the audio signal). Or the number of control signals) and the envelope value of the detected video signal (or the envelope value of the audio signal or the number of control signals) is preset, that is, when the video cassette recorder set is in a normal state. If it is equal to the detected envelope value (or the number of control signals detected in the normal state), it indicates that the video cassette recorder set to be tested is normally played for the video signal (or audio signal or control signal). OSD message on screen If the envelope value (or the envelope value of the audio signal or the number of control signals) of the detected video signal is not the same as the preset video signal (or the envelope value of the audio signal or the number of control signals), the current test By determining that the video cassette recorder set is playing abnormally on the video signal (or audio signal or control signal) and displaying an OSD message on the screen indicating that it is abnormal, the inspector does not check a large number of test signals one by one The test is only performed on the signal, which reduces the test time.

While the invention has been shown and described with respect to certain preferred embodiments, it will be apparent to those skilled in the art that various modifications, changes and omissions can be made without departing from the spirit and scope of the invention.

Claims (2)

An apparatus for checking the presence or absence of an abnormal state of a video cassette recorder set for checking the presence or absence of an abnormal state from a signal provided from a video cassette recorder set in a reproduction state, A control signal detector for detecting and providing a number of control (CTL) signals among reproduction signals of the video cassette recorder set; A video signal envelope detector for detecting and providing an envelope value of a video signal among reproduction signals of the video cassette recorder set; An audio signal envelope detector for detecting and providing an envelope value of an audio signal among reproduction signals of the video cassette recorder set; If the number of control signals provided by the control signal detector is the number of control signals in a normal signal state, a message indicating that the control signal is in a normal state is displayed on the screen, and the video signal envelope detector and the audio signal envelope detector are provided. A microcomputer that displays a message indicating that the video signal and the audio signal are in a normal state when each envelope value is equal to each envelope value detected in a preset normal state; And an OSD unit for displaying a character font indicating a state of a control signal, a video signal, and an audio signal at a corresponding position on the screen according to the control of the microcomputer. In the method for checking the abnormality of the video cassette recorder set, A first step of playing back the tape when a key signal for testing the video cassette recorder set is provided with the tape inserted in the video cassette recorder set; A second step of displaying an OSD menu screen for checking whether there is an abnormality in a playback signal of the tape; A third step of determining a type of a test signal selected from the OSD menu screen of the second step; A fourth step of detecting an envelope value of the corresponding signal if the type of the test signal selected in the third step is a video signal or an audio signal; If the envelope value of the selected signal is equal to the preset steady state envelope value, a message indicating that the video signal or the audio signal is in a normal state is displayed on the screen, and the envelope value of the selected signal is the same as the preset normal state envelope value. Otherwise, displaying a message indicating that a video signal or an audio signal is in an abnormal state on a screen; A sixth step of detecting the number of control signals from the reproduced signal if the type of the signal selected in the third step is a control signal; If the number of the detected control signal is the number of control signals detected from the normal signal, a message about the normal state is displayed on the screen, and if the number of the detected control signal is not the number of control signals detected from the normal signal, the abnormal state Method for checking the abnormality of the video cassette recorder set comprising the seventh step of displaying a message on the screen.