KR19980050205A - Video cassette recorder with status notification - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette recorder having an operation state notification function for indicating an abnormal state of a video cassette recorder or a cleaning point of a head based on a reproduced video signal and a control signal. A video cassette recorder having a video head for control and a control head for reading a control signal; A control signal discrimination unit for outputting a result signal when a normal control signal is detected from the control head, and a sync signal discrimination unit for outputting a result signal when a normal sync signal is detected from a composite video signal, and predetermined control An OSD generator for outputting OSD data based on a signal, a mixer for mixing a composite video signal with the OSD data, and controlling the OSD generator based on a result signal output from the synchronization signal detector and the control signal discriminator And a controller for controlling to output predetermined OSD data to the mixer.

Description

Video cassette recorder with status notification

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette recorder, and more particularly, to a video cassette recorder having an operation state notification function for indicating an abnormal state of a video cassette recorder or a cleaning time of a head based on a video signal and a control signal to be reproduced.

Magnetic tapes currently used in video cassette tapes (hereinafter referred to as tapes) are capable of recording information by magnetizing a thin film uniformly coated with a magnetic material with a contracted electromagnetic signal. It is intended to be read.

Fig. 1 is a block diagram showing the configuration of a general video cassette recorder using the above video cassette tape.

In the drawing, reference numeral 1 is a remote control device for remotely controlling the overall device, 2 is a receiving unit for receiving an infrared signal transmitted from the remote control device 1 and converting it into an electrical code signal, and 3 is a receiving unit 2 A microprocessor as a control unit for controlling the operation of the overall apparatus based on the code signal output from the ().

In addition, reference numeral 4 is a supply reel for conveying the tape wound while rotating in a constant direction, 5 is a rewind reel to rewind the tape supplied from the supply reel (4), 6 is from the microprocessor (3) A recording / playback head for recording a video signal on a tape conveyed from the supply reel 4 or reading out a recorded video signal according to a predetermined control signal, and 7 drives the recording / playback head 6. The controlling / recording head driver 8 is a switching unit which performs switching switching according to the execution of the recording or reproducing operation on the basis of a predetermined control signal from the microprocessor 3.

On the other hand, reference numeral P _in denotes a video signal input terminal for receiving a video signal output from a television receiver or camcorder connected to a video cassette recorder, and reference numeral 9 denotes an internal portion of the apparatus through this video signal input terminal P _in . YC separation section for dividing and outputting the video signal applied to the luminance signal (Y) and the color tone signal (C), 10 is a frequency modulation circuit for frequency modulating the luminance signal (Y) output from the YC separation section (9) 11 denotes a frequency low pass conversion circuit for converting the color tone signal C output from the YC separation unit 9 into a low band frequency signal and outputting the low frequency signal, and 12 denotes the frequency modulation circuit 10 and the frequency low pass conversion circuit 11. Mixer (Mixer) for mixing the luminance signal (Y) and the color tone signal (C) respectively output from the (), 13 amplifies the video signal output from the mixer 12 to a predetermined level of the switching unit (8) It is an amplifying unit to be supplied to the recording terminal R. .

Reference numeral HD2 denotes a control head for recording and reading a control signal. Reference numeral 14 denotes an amplifying unit for amplifying and outputting a control signal read from the control head HD2. And a preamplifier for amplifying and outputting a video reproduction signal input from the reproduction terminal P side of FIG.

Reference numeral 16 denotes a high pass filter for detecting only the luminance signal Y from the reproduction signal output from the preamplifier 22, and 17 denotes a high pass filter 16. A frequency demodulation circuit for demodulating the luminance signal outputted therein, 18 is a low pass filter for detecting only the hue signal C from the reproduction signal output from the preamplifier 22; A frequency high frequency conversion circuit for converting the color tone signal output from the low pass filter 18 into a high frequency signal of a predetermined frequency band, 20 is a luminance signal Y output from the frequency demodulation circuit 17 and the frequency high frequency conversion. A mixer 21 for synthesizing the hue signal C outputted from the circuit 19, 21 is an amplifier which amplifies the video reproduction signal synthesized by this mixer 20 to a predetermined level, and P _out is an amplifier 21. Amplified video playback signal from the TV An output terminal for outputting a video output device of the like.

Reference numeral 23 denotes a waveform shaping circuit for shaping the control signal amplified by the amplifier 14 into a square wave using a Schmitt trigger or the like, and 24 denotes a square wave pulse output from the waveform shaping circuit 23. When this pulse is applied and normally detected, it is a pulse judging device which outputs a high level detection signal to the microprocessor 3 side, for example.

That is, when the user inputs a playback command signal using a predetermined input means such as the remote control apparatus 1, the video cassette recorder having the above configuration reads out the magnetic data applied on the tape and restores the video and audio signals. And then output to the image output means and the audio output means, respectively. When the recording command signal is input from the user, the video and audio signals are applied to the tape as magnetic data in the reverse order to the above reproducing operation.

On the other hand, the tape records a video signal in the middle of the track, an audio signal in the upper end of the track, and a control signal in the lower end of the track.

Here, the control signal is used as the basis of the VHS (VHS Index Search System) for controlling the phase of the capstan motor and marking the beginning of the tape, and in the case of the conventional video cassette recorder The start point of the tape can be displayed by using the bis signal.

By the way, the video screen may not be output due to the mechanical failure of the video cassette recorder when the tape is played, but the video screen at the time of playback is very poorly output even if foreign matter is caught in the video head.

In this case, the user may be mistaken for a hardware failure even when a foreign material is caught in the video head, which can be easily solved based on a control signal and a composite video signal which are added to the tape and become a reference signal when the tape is played. do.

Accordingly, the present invention has been made in view of the above circumstances, and has a video with an operation state notification function for notifying an abnormal state of a video cassette recorder or a cleaning time of a head based on a synchronization signal and a control signal included in a composite video signal. It is an object to provide a cassette recorder.

1 is a block diagram showing the configuration of a conventional video cassette recorder.

Figure 2 is a block diagram showing the configuration of a video cassette recorder with an operation status notification function according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: Remote controller 2: Receiver

3, 30: microprocessor 4: supply reel

5: Rewind 6: Head for recording / playback

7: Head drive unit for recording / playback 8: Switching unit

9: Y-C separation unit 10: FM modulation circuit

11: frequency low frequency conversion circuit 12, 20, 34: mixer

13, 14, 21: amplifier 15: control head drive unit

16: High Pass Filter 17: FM Demodulation Circuit

18: Low Pass Filter 19: Frequency High Frequency Conversion Circuit

22: preamplifier 23: waveform shaping circuit

24: pulse judgment unit 31: subtitle data storage unit

32: OSD generator 33: Sync signal detector

HD2: control head

A video cassette recorder having an operation state notification function according to the present invention for realizing the above object comprises a video cassette recorder having a video head for reading a video signal recorded on a tape and a control head for reading a control signal. To; A control signal discrimination unit for outputting a result signal when a normal control signal is detected from the control head, and a sync signal discrimination unit for outputting a result signal when a normal sync signal is detected from a composite video signal, and predetermined control An OSD generator for outputting OSD data based on a signal, a mixer for mixing a composite video signal with the OSD data, and controlling the OSD generator based on a result signal output from the synchronization signal detector and the control signal discriminator And a controller for controlling to output predetermined OSD data to the mixer.

That is, according to the present invention having the above-described configuration, the user can be notified by detecting the cleaning state of the head or the abnormal state of the video cassette recorder.

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

FIG. 2 is a block diagram showing the configuration of a video cassette recorder having a head cleaning point notification function according to an embodiment of the present invention. The same components as in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 2, reference numeral 30 denotes a microprocessor that controls the entire apparatus according to a user's key input, and 31 denotes a caption data storage unit for storing predetermined caption data. The caption data storage unit 31 is, for example, a head. Please clean the alarm or the VCR has an error.

Further, reference numeral 32 is an OSD generator for outputting predetermined OSD data based on the control signal from the microprocessor 30, and 33 is a synchronization signal detected from the composite video signal output from the mixer 20. Therefore, the synchronization signal detector 34 for outputting a predetermined result signal is a mixer for mixing the OSD data output from the OSD generator 32 and the composite video signal input from the mixer 20.

Next, the operation of the device having the above configuration will be described.

First, the microprocessor 30 inserts the tape into the deck side, and then, when a predetermined playback signal is input from the remote control device 1, the microprocessor 30 mounts the tape in the deck, as well as a loading arm, a guide post, and a loading (not shown). The drive control is performed such that the track of the tape is brought into close contact with the head provided in the drum.

Subsequently, the microprocessor 30 drives the tape and drives the video head 6, the video head driver 7, the control head HD2, the control head driver 15, and the like to record an image recorded on the tape. Control to read the signal and the control signal. Then, the video signal read out from the video head 6 is converted into a composite video signal through a series of image processing and then output to the predetermined video output means side, and the control signal read out from the control head HD2 is a square wave waveform. After being shaped, it is input to the pulse determining unit 24.

On the other hand, the pulse determiner 24 outputs, for example, a high level signal when the waveform-shaped control signal is normally input, and outputs a low level signal to the microprocessor 30 when it is not normally input. . In addition, the synchronization signal detector 33 detects the synchronization signal from the composite video signal read out from the video head 6 and passed through a series of image processing processes. If the signal is not detected normally, a low level signal is output.

Subsequently, the microprocessor 30 stores the subtitle data when a high level signal is output from the sync signal detector 33 while a high level signal is output from the pulse determiner 24 while the tape is being played. For example, by reading the warning message that the foreign object is caught in the head 31, and outputs to the mixer 34 through the OSD generating section 32 and mixed with the composite video signal to output to a predetermined video output means The user is notified when the head is cleaned.

In addition, the microprocessor 30 may output the subtitle data storage unit 31 when a low level signal is output from the pulse determiner 24 while a high level signal is output from the synchronization signal detector 33. For example, a warning message indicating that an abnormality has occurred in the VCR is read out, output to the mixer 34 through the OSD generator 32, mixed with a composite video signal, and output to a predetermined video output means. This indicates the abnormal condition of the video cassette recorder.

That is, according to the above embodiment, it is possible to determine the cleaning time of the head or the abnormal state of the video cassette recorder based on the synchronization signal and the control signal added to the tape and notify the user of this.

The present invention is not limited to the above embodiments and can be variously modified within the scope not departing from the technical gist of the present invention.

As described above, according to the present invention, it is possible to realize a video cassette recorder having an operation state notification function for notifying the abnormal state of the video cassette recorder or the cleaning time of the head based on the synchronization signal and the control signal included in the composite video signal. do.

Claims (1)

A video cassette recorder having a video head for reading a video signal recorded on a tape, and a control head for reading a control signal, the video cassette recorder comprising: outputting a result signal when a normal control signal is detected from the control head; A control signal discrimination unit, a synchronization signal discrimination unit for outputting a result signal when a normal synchronization signal is detected from the composite video signal, an OSD generator for outputting OSD data based on a predetermined control signal, and a composite video signal; A mixer for mixing the OSD data, and a controller configured to control the OSD generator to output predetermined OSD data to the mixer based on a result signal output from the sync signal detector and a control signal determiner. Video case with operation status notification, characterized in that Recorder.