KR19990025369A - Video cassette recorder capable of selective recording and its driving method - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette recorder, comprising: a video cassette recorder having a key matrix (9) configured with a recording key and a plurality of function keys for setting a recording mode, and recording an input video signal upon application of a recording control signal; A recorder 3 for outputting; A deck (4) for recording the video signal of the recorder (3) on a video tape upon application of a recording control signal; A synchronization detector 6 for detecting and outputting a synchronization signal from an input video signal; A filter 7 for filtering the burst signal from the input video signal; An integrating unit 8 for integrating the output of the filter 7; When the recording key is driven, a synchronization signal is applied from the synchronization detector 6, and a voltage equal to or higher than a predetermined reference voltage is applied from the integrator 8, the recording control signal is outputted, and a synchronization signal is applied after driving the recording key. Otherwise, the microcomputer 2 which outputs the first display signal to the second display signal when a voltage below the predetermined reference voltage is applied from the integrator 8; A first display section (10) for driving when the first display signal is applied to indicate that the synchronization signal is not being applied; A second display section 11 is provided for driving when the second display signal is applied to indicate that a voltage below a predetermined reference voltage is being applied from the integrating section 8.

Description

Video cassette recorder capable of selective recording and its driving method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette recorder (hereinafter referred to as a VCR), and more particularly, to a video cassette recorder capable of selectively recording according to the state of a video signal, and a driving method thereof.

A VCR is a recording and reproducing apparatus that records a video signal photographed through a camera or the like and a video signal received through a tuner or records a video signal recorded on a video tape to be played back. On the other hand, the video signals to be recorded on the videotape through the VCR may include video signals that cannot be played back due to noise or the like, and these video signals can be viewed unless viewed through a monitor or the like. The inconvenience of not being able to judge cognition.

In order to solve this inconvenience, the presence of a synchronization signal is conventionally used. That is, the sync signal is essentially included in the video signal, and the sync signal can be canceled when the video signal is degraded due to external noise. Therefore, the VCR records only when the sync signal is included in the video signal. To operate in mode.

However, in the conventional method of determining whether to record a VCR with or without a sync signal, a broadcast signal including a sync signal can be recorded. Thus, even if a sync signal is included, a broadcast signal with poor image quality is recorded. There is a problem with losing. In other words, there is a broadcast signal that is degraded to an extent that viewing is inconvenient among the broadcast signals including the synchronization signal.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a VCR capable of selectively recording a recording mode selectively according to the state of a video signal.

Another object of the present invention is to provide a method of driving a VCR capable of selectively recording a recording mode selectively in accordance with the state of a video signal.

In order to achieve this object, the present invention provides a video cassette recorder having a key matrix composed of a recording key and a plurality of function keys for setting a recording mode, which records and outputs an input video signal upon application of a recording control signal. A recorder; A deck for recording a video signal of a recording system on a video tape upon application of a recording control signal; A synchronization detector for detecting and outputting a synchronization signal from an input video signal; A filter for filtering the burst signal from the input video signal; An integrating unit for integrating the output of the filter; When the recording key is driven, a synchronization signal is applied from the synchronization detector, and a voltage equal to or higher than a predetermined reference voltage is applied from the integrator, a recording control signal is output. If the synchronization signal is not applied after driving the recording key, the first display signal is output. A microcomputer outputting a second display signal when a voltage below a predetermined reference voltage is applied from the integrating unit; A first display portion which is driven when the first display signal is applied and which indicates that no synchronization signal is being applied; And a second display portion for driving when the second display signal is applied to indicate that a voltage below a predetermined reference voltage is being applied from the integrating portion.

The present invention also provides a video cassette recorder, comprising: determining whether a recording mode is set; Determining whether a synchronization signal is detected from a video signal input for recording; Indicating that a synchronization signal is not detected if a synchronization signal is not detected; Determining whether a burst signal of a video signal input for recording is normal when a synchronization signal is detected; Indicating that the burst signal is abnormal if the burst signal is abnormal; And if the synchronization signal is detected and the burst signal is normal, recording the video signal.

1 is a block diagram of a video cassette recorder capable of selective recording according to the present invention;

2 is a flowchart illustrating a method of driving a video cassette recorder capable of selective recording according to the present invention.

Explanation of symbols for main parts of the drawings

1: tuner 2: micom

3: recorder 4: deck

5: playback system 6: synchronization detection unit

7: filter 8: integral part

9: key matrix 10: display unit

11: display unit

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

1 is a block diagram of a VCR according to the present invention. In this embodiment, a video signal to be recorded on a video tape is a signal received by the tuner 1 inside the VCR. The tuner 1 receives and outputs a video signal of a predetermined channel according to the control of the microcomputer 2, and the recorder 3 records the video signal of the tuner 1 when the recording control signal of the microcomputer 2 is applied. It is processed and applied to deck 4. The deck 4 records all the circuit and mechanical components of the VCR which records the video signal of the recorder 1 on the video tape and reads the video signal recorded on the video tape and applies it to the reproduction system 5. It is configured to record the video signal of the recording system 1 on the video tape when the recording control signal is applied from the microcomputer 2 and to read the video signal of the video tape when the reproduction control signal is applied from the microcomputer 2. have.

On the other hand, the video signal received by the tuner 1 is applied to the sync detector 6 and the filter 7, respectively, as shown, and the sync detector 6 detects the sync signal in the video signal and sends it to the microcomputer 2. It is configured to apply. In addition, the filter 7 filters the burst signal in the video signal, that is, the color burst signal band which is a reference for the color signal, and applies it to the integrating unit 8. The integrating unit 8 integrates this burst signal and applies it to the microcomputer 2 so that the output voltage of the integrating unit 8 applied to the microcomputer 2 can be regarded as indicating the state of the burst signal. That is, when the burst signal is distorted and erased by external noise or the like, the integrated voltage of the integrator 8 has a minute voltage state, but when the burst signal is well received, the output voltage of the integrator 8 is relatively high. Will maintain the voltage state.

As shown, the key matrix 9 is connected to the microcomputer 2, and the microcomputer 2 responds to the driving of the driving keys of the key matrix 9, that is, the function keys such as the recording key, the playback key, and the stop key. The operation of the VCR is controlled. For example, when the recording key is pressed, the microcomputer 2 outputs a recording control signal, the recorder 3 drives the deck 4 in the recording mode, and when the playback key is pressed, the microcomputer 2 is deck 4. And the regeneration system 5 is driven in the regeneration mode. In addition, when the microcomputer 2 drives in the recording mode by driving the above-described recording key, if the synchronization signal is not applied from the synchronization detector 6, the microcomputer 2 sends the first display signal to the display unit 10. When the output voltage is applied below the predetermined reference voltage, the display unit 11 is configured to output the second display signal. In addition, as described later, after the output of the first or second display signal, the microcomputer 2 does not detect the synchronization signal continuously for a predetermined time, or the voltage greater than or equal to the predetermined reference voltage is not applied from the integrator 8, When the predetermined key of the key matrix 2 is not driven, the recording mode is stopped, but the first or second display signal is continuously output. After the first or second display signal is output, the microcomputer 2 detects a synchronization signal within the above-described predetermined time, or when a voltage above a predetermined reference voltage is applied from the integrator 8 or within the above-described predetermined time. The output of the display signal is stopped only when the predetermined key of the key matrix 9 is driven or when the display unit driving stop key of the key matrix is driven after the execution of the recording mode is stopped.

The display units 10 and 11 may be driven according to display signals, and the display unit 10 may be formed of a liquid crystal display, a light emitting diode, or an OSD. It will be easy to see.

2 shows an operation flowchart of such a microcomputer 2 in detail.

As shown, it is determined whether the recording key of the key matrix 9 of the microcomputer 2 is set to the recording mode (step 20). If the recording mode is set, the process proceeds to step 22, and the recording mode is set. If not, proceed to step 21 to perform the mode. In step 22, the microcomputer 2 judges whether a synchronization signal is applied from the synchronization detection unit 6, or if the synchronization signal is not applied to step 26, if the synchronization signal is applied to step 23; Proceed. In step 23, the microcomputer 2 determines whether the output voltage of the integrator 8 is greater than or equal to the predetermined reference voltage, and if it is less than or equal to the predetermined reference voltage, the microcomputer 2 proceeds to step 26, and if it is greater than or equal to the predetermined reference voltage, the operation proceeds to step 24. Proceed. That is, the microcomputer 2 determines whether the synchronization signal is included in the video signal received by the tuner 1 in steps 22 and 23 and whether the burst signal is in a good state.

As a result of the determination of steps 22 and 23, when the synchronization signal is detected and the status of the burst signal is good, the microcomputer 2 drives the recording system 3 and the deck 4 in the recording mode by outputting the recording control signal. (Step 25) and return to step 20. In this case, when the step 24 is configured, the display units 10 and 11 may be driven by the steps 26 and 27 described later, and the driving of the display units 10 and 11 is stopped.

That is, the microcomputer 2 applies the first display signal to the display unit 10 when the synchronization signal is not detected as a result of the determination in step 22 (step 26), and the second display when the state of the burst signal is poor. By applying a signal to the display unit 11, the display units 10 and 11 are driven. Accordingly, the user may know that the synchronization signal is not detected in the broadcast channel currently being recorded or that the burst signal is bad. As described above, in the case where the synchronization signal is not detected or the burst signal is poor and the video signal is recorded and then played back, the reproduced video signal is in a state in which viewing is impossible. Therefore, when the user confirms the driving of the first or second display units 10 and 11, the user may stop the execution of the recording mode by driving a key (eg, a stop key) of the key matrix 9.

In preparation for such a state, the microcomputer 2 determines whether the predetermined key of the key matrix 9 has been driven within a predetermined time (steps 28 and 31), and when the predetermined key is driven, the above-described steps 26 and 27 are performed. By stopping the output of the output display signal, driving of the display units 10 and 11 is stopped (step 29), and the VCR is driven in a mode corresponding to the drive key of the key matrix 9 (step 30).

However, as a result of the determination of steps 28 and 29, if the key of the key matrix 9 has not been driven for a predetermined time, i.e., if the user does not take any action even though the video signal being recorded is in a bad state, the display unit is displayed. It may be the case that the operation of (10, 11) is not confirmed. In this case, since the viewing is not possible even after playing the recorded video signal, the microcomputer 2 stops performing the recording mode (step 32), but the display units 10 and 11 do not stop the output of the display signal to continue driving. Do not. In other words, the first or second display units 10 and 11 are continuously driven so that the user can know why the recording is not performed later. The driving of the display units 10 and 11 is stopped by driving the display unit driving stop key of the key matrix 9 as described above (steps 33 and 34). Here, the reason why the predetermined time (step 31) is set is that the synchronization signal and the burst signal are not detected temporarily or deteriorated (e.g., occurring during the flight). This is to determine whether the burst signal is continuously degraded.

As described above, the VCR of the present invention prevents recording of a deteriorated video signal by displaying the reason why the recording is not performed without recording the video signal where the synchronization signal is not detected and the video signal having the poor burst signal. The effect is that you can.

Claims (8)

A video cassette recorder having a key matrix 9 composed of a recording key and a plurality of function keys for setting a recording mode, A recorder 3 for recording and outputting an input video signal upon application of a record control signal; A deck (4) for recording the video signal of the recorder (3) on a video tape when the recording control signal is applied; A synchronization detector (6) for detecting and outputting a synchronization signal from the input video signal; A filter (7) for filtering a burst signal from the input video signal; An integrating unit 8 for integrating the output of the filter 7; Outputs the recording control signal when the recording key is driven, a synchronization signal is applied from the synchronization detector 6, and a voltage equal to or greater than a predetermined reference voltage is applied from the integrator 8, and after driving the recording key. A microcomputer (2) which outputs a first display signal when the synchronization signal is not applied, and a second display signal when a voltage below a predetermined reference voltage is applied from the integrator (8); A first display section (10) for driving when the first display signal is applied to indicate that the synchronization signal is not being applied; And a second display section (11) for driving upon application of said second display signal to indicate that a voltage below a predetermined reference voltage is being applied from said integrating section (8). 2. The microcomputer (2) according to claim 1, wherein the microcomputer (2) is not applied with the synchronization signal continuously for a predetermined time after the output of the first or second display signal, or a voltage below the reference voltage is received from the integrator (8). 15. A video cassette recorder capable of selective recording, configured to stop performing the recording mode if continuously applied. 3. The output of the first and / or second display signal according to claim 2, wherein the microcomputer (2) outputs the first or / and second display signal when a function key for instructing driving from the key matrix (9) to a mode other than a recording mode is driven within the predetermined time. And a video cassette recorder capable of selectively recording, configured to stop the operation and to operate in a mode corresponding to the driven function key. 4. The microcomputer (2) according to claim 3, wherein the microcomputer (2) is not applied with the synchronization signal continuously for a predetermined time after the output of the first or second display signal, or a voltage below the reference voltage is received from the integrator (8). The first and / or after driving of the function key for stopping the driving of the first and / or second display unit 10, 11 from the key matrix 9 after continuing to apply the recording mode. A video cassette recorder capable of selective recording configured to stop the output of the second display signal. As a video cassette recorder, Determining whether a recording mode is set; Determining whether a synchronization signal is detected from a video signal input for recording; Indicating that a synchronization signal is not detected if the synchronization signal is not detected; Determining whether a burst signal of a video signal input for the recording is normal when the synchronization signal is detected; Indicating that the burst signal is abnormal when the burst signal is abnormal; And recording the video signal when the synchronization signal is detected and the burst signal is normal. 6. The video cassette recorder capable of selective recording according to claim 5, further comprising discontinuing the recording mode when the synchronization signal is not detected or the burst signal is abnormal for a predetermined time during recording of the video signal. Method of driving. The method according to claim 6, wherein the synchronization signal is not detected during the predetermined time or the burst signal is abnormal so that the synchronization signal is not detected after the recording mode is stopped or the burst signal is not abnormal. And stopping the execution of the step of indicating that the synchronous signal is not detected or the burst signal is abnormal during the predetermined time when a mode to be set is set. The method of claim 7, wherein if a mode for driving the video cassette recorder in a mode other than a recording mode is set within the predetermined time, the performing of the step of indicating that the synchronization signal is not detected or the burst signal is abnormal is stopped. A method of driving a video cassette recorder capable of selective recording in mode.