KR19980030892A - Video cassette recorder with recording date of cleaning tape - Google Patents

Abstract

The present invention records the date of use of the cleaning tape in a predetermined portion of the tape, and reads the recorded information prior to the head cleaning, and outputs a guide subtitle so that the user can easily check whether it is time to perform the head cleaning. A video cassette recorder having a recording date recording function, comprising: a function selection unit for selecting a head cleaning function, a CTL head for recording and reproducing a duty ratio control signal (CTL) according to a predetermined control command; A waveform shaping circuit for shaping the control signal CTL output from the CTL head into a square wave, and a pulse plate for outputting a predetermined code signal corresponding to the duty ratio based on the duty ratio of the signal output from the waveform shaping circuit. The tape corresponding to the code signal for the code signal detected by the government Date code information storage unit for storing the date of use information as data, a timer for generating a predetermined time data for counting the current time, an OSD generator for outputting the OSD pattern signal according to a predetermined control command, the output of this OSD generator A mixer that mixes and outputs a signal and a reproduced video signal, and when the head cleaning function is selected through the function selection unit, reads the recorded information prior to cleaning and outputs a guide subtitle, and the cleaning operation is performed by the user's reselection. After the execution, characterized in that it comprises a control unit for controlling to update the cleaning execution date to a predetermined portion of the tape.

Description

Video cassette recorder with recording date of cleaning tape

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette recorder, and more particularly, to record a date of use of a cleaning tape on a predetermined portion of the tape, read out the recorded information prior to the head cleaning, and output a guide subtitle to perform the head cleaning. The present invention relates to a video cassette recorder having a recording date recording function, so that it is easy to check whether or not it is used.

Widely used in general audio equipment, including video cassette recorders (hereinafter referred to as VCRs), magnetic tape is made by magnetizing a thin film uniformly coated with a magnetic material with a contracted electromagnetic signal corresponding to predetermined data. 1 is a functional block diagram for explaining a recording function of a conventional general VCR.

In FIG. 1, reference numeral 1 denotes a remote controller for remotely operating the entire apparatus, and 2 denotes a receiver which receives an infrared signal transmitted from the remote controller 1 and converts it into an electrical code signal. It is a microprocessor as a control unit which controls the operation of the apparatus as a whole based on the code signal output from the receiver 2.

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 released 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 recorded video data in accordance with a predetermined control signal of < RTI ID = 0.0 > 7, < / RTI > The head drive unit 8 for driving control is a switching unit that 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 applied from a TV receiver or a camcorder connected to a VCR, and reference numeral 9 is applied to the inside of the apparatus through this video signal input terminal P _in . YC separation unit for separating and outputting the video signal to be divided into the luminance signal (Y) and the color tone signal (C), 10 is a frequency modulation (FM) of the luminance signal (Y) separated and output from the YC separation unit (9) FM modulation circuit, 11 is a frequency low-frequency conversion circuit for converting and outputting the tone signal (C) which is separated from the luminance signal in the YC separation unit 9 into a low-band frequency signal, 12 is the FM modulation circuit 10 and A mixer (MIXER) for mixing the luminance signal (Y) and the color tone signal (C) respectively output from the frequency low-frequency conversion circuit 11, 13 amplifies the video signal mixed in the mixer 12 to a predetermined level A signal for supplying the amplified signal to the fixed terminal (R; recording) of the switching unit (8) It's a wealth.

Reference numeral HD2 denotes an audio head for recording and reading a voice signal, reference numeral 14 denotes an amplifier for amplifying and outputting a voice signal read from the audio head HD2, and 22 denotes the switching unit ( And a preamplifier for amplifying and outputting a video reproduction signal applied to the fixed terminal (P) side of 8).

Reference numeral 16 denotes a high pass filter (HPF) for detecting only the luminance signal Y among the reproduction signals output from the preamplifier 22, and 17 denotes this high band pass filter 16 ( FM demodulation circuit for demodulating the luminance signal output from the HPF), 18 is a low pass filter LPF for detecting only the hue signal C among the reproduction signals output from the preamplifier 22; Low Pass Filter), 19 is a frequency high-frequency conversion circuit for converting a color tone signal output from the low pass filter 18 (hereinafter referred to as LPF) into a high frequency signal of a predetermined frequency band, and 20 is the FM demodulation circuit. Mixer (MIXER) for combining the luminance signal (Y) output from the furnace (17) and the color tone signal (C) output from the frequency high-frequency conversion circuit (19), 21 is a playback image synthesized by the mixer (20) an amplification section for amplifying the signal to a predetermined level, a reference numeral P _out is the amplification section 21 An output terminal for outputting the standing amplified reproduced video signals toward the image output device such as a TV.

That is, in the conventional general VCR having the above-described configuration, while the user inputs a recording execution command through the remote controller 1, the audio signal is at the top of the track and the control signal CTL is tracked based on the video signal. It is recorded at the bottom of each.

Here, the control signal CTL is a signal used as a basis for a phase control of a capstan motor and a VHS index search system (VISS) for indicating the beginning of a tape. By recording CTL peak signals at a predetermined interval on a predetermined portion of the tape as shown in (a), waveform-forming the peak signals during playback, and determining their duty ratio as shown in Fig. 3 (b). It is to check the information recorded on the tape.

On the other hand, if the VCR is used for a long time, foreign substances may be caught in the head part, resulting in deterioration of the image quality during playback and damage to the head and tape. In order to prevent this, each household typically uses a cleaning tape to prevent the head. Remove foreign substances stuck in the

It is difficult for the general user to visually identify the cleaning state of the head part. Also, the cleaning of the head part using the cleaning tape is performed irregularly whenever the user deems it necessary based on the quality state of the playback video. If the user does not pay attention, the proper cleaning time is missed, causing the tape to be in poor condition and the magnetic part being damaged.

The present invention has been made in view of the above-described circumstances, and allows the user to perform head cleaning by recording the date of use of the cleaning tape on a predetermined portion of the tape, reading out the recorded information prior to performing the head cleaning, and outputting a guide subtitle. It is an object of the present invention to provide a video cassette recorder with a recording date recording function, which makes it easy to check whether it is time to execute.

1 is a functional block diagram illustrating the recording and playback functions of a conventional general VCR.

Figure 2 is a block diagram showing the internal structure of the VCR with a cleaning tape date recording function according to an embodiment of the present invention.

3 is a diagram illustrating an example of recording CTL information indicating a cleaning tape use date.

4 is a flow chart for explaining the operation of the apparatus in the configuration of FIG.

5 is a diagram illustrating an output state of a guide caption.

*** Explanation of symbols for main parts of drawing ***

1, 28: remote control device 2, 29: receiver

3, 33: microprocessor 4: supply reel

5: Rewind 6: Head for recording / playback

7: R / P head drive unit 8: switching unit

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

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

13, 14, 21, 31: amplifier 15: audio head drive

16: HPF (High Pass Filter) 17: FM demodulation circuit

18: LPF (Low Pass Filter) 19: Frequency High Frequency Conversion Circuit

22: preamplifier 30: CTL head drive unit

32: waveform shaping circuit 34: pulse judgment unit

35: date code information storage unit 36: OSD generation unit

37: MIXER 38: Timer

HD1: CTL Head HD2: Audio Head

A video cassette recorder having a cleaning tape use date recording function according to the present invention for realizing the above object comprises a function selection unit for selecting a head cleaning function, and a control signal (CTL) of a duty ratio contracted according to a predetermined control command. A CTL head for recording and reproducing, a waveform shaping circuit for shaping the control signal (CTL) output from the CTL head into a square wave, and a predetermined corresponding duty ratio based on the duty ratio of the signal output from the waveform shaping circuit. Pulse code output unit for outputting code signal, date code information storage unit for storing tape use date information corresponding to the code signal with respect to code signal detected by this pulse judgment unit, and predetermined time for counting current time A timer for generating data, an OSD generator for outputting an agreed OSD pattern signal according to a predetermined control command, and an output signal of the OSD generator A mixer that mixes and outputs a call and a reproduced video signal, and when the head cleaning function is selected through the function selection unit, reads the recorded information prior to the cleaning operation, outputs a guide subtitle, and performs cleaning by user reselection. After the execution, characterized in that it comprises a control unit for controlling to update the cleaning execution date to a predetermined portion of the tape.

That is, according to the present invention having the above-described configuration, when the user performs head cleaning by recording the date of use of the cleaning tape in a predetermined portion of the tape, reading the recorded information prior to the head cleaning, and outputting a guide subtitle. It will provide convenience so that it can be checked easily.

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

FIG. 2 is a block diagram showing an internal configuration of a VCR equipped with a cleaning tape date-of-use recording function according to an embodiment of the present invention. Referring to the same elements as those shown in FIG. The numbers will be omitted and the detailed description thereof will be omitted.

In FIG. 2, reference numeral 28 denotes a remote controller device that is further provided with a predetermined function key (not shown) for selecting a cleaning tape use function, and 29 receives an infrared signal transmitted from the remote controller device 28 and Receiving unit for converting and outputting the electrical code signal, 33 as a control unit for controlling the entire device and the function of recording or reading the data according to the date of use on the predetermined portion of the tape according to the user's function key selection It is a microprocessor.

Reference numeral HD1 denotes a CTL head for recording or reading a control signal CTL according to a predetermined control signal, and reference numeral 30 denotes driving control of the CTL head HD1 under the control of the microprocessor 33. CTL head driver 31 denotes an amplifier for amplifying the signal detected by the CTL head HD1, and reference numeral 32 denotes a square wave of the control signal CTL amplified by the amplifier 31 using a Schmitt trigger or the like. A waveform shaping circuit for shaping a waveform, reference numeral 34 receives a square wave pulse output from the waveform shaping circuit 32 and outputs a digital code signal corresponding to the duty ratio based on the duty ratio of the pulse. It is a pulse judgment unit.

Reference numeral 35 is a date code information storage unit for storing tape use date information corresponding to the code signal with respect to the code signal detected by the pulse determining unit 34, and 36 denotes the microprocessor 33. OSD control unit for outputting the hue signal (R, G, B) and the blanking signal (Y ') of the predetermined OSD pattern under the control of the control panel, 37 is the output signal of the OSD generator 36 and the amplifier 21 A mixer is used to mix the playback video signal outputted from the control panel and to transmit it to an image output apparatus such as a TV through an output terminal P _out2 . Reference numeral 38 denotes a timer for generating predetermined time data for counting the current time.

Next, the operation of the apparatus having the above configuration will be described with reference to the flowchart shown in FIG.

First, when a user selects a function key included in the remote control device 28 while the user inserts the head cleaning tape into the deck (not shown) (ST 1), the microprocessor 33 performs the rewind operation. Will be executed (ST 2).

When the tape is confirmed to be rewound to the first position (ST 3), the microprocessor 33 then executes the playback operation (ST 4), at which time the date of recent use recorded in the predetermined portion of the front of the tape Information is read by the CTL head HD1 (ST 5).

The read CTL signal is amplified to a predetermined level by the amplification unit 31 to exhibit a peak waveform, for example, as shown in (c) of FIG. 3, and the peak waveform signal passes through the waveform shaping circuit 32. At the same time, it is converted into a square wave signal as shown in FIG.

The pulse determiner 34 is binary data '1' in the case of a 7: 3 duty ratio based on the duty ratio of the square wave signal output from the waveform shaping circuit 32, and has a duty ratio of 3: 7. In this case, it is determined as the binary data '0', respectively, and outputs a digital code signal according to the duty ratio. The microprocessor 33 is based on the data stored in the date code information storage unit 35. The code signal applied from the pulse judging unit 34 is determined to read the tape use date data according to the code signal.

Subsequently, the microprocessor 33 drives and controls the OSD generator 36 based on the data read by the above process, and finally outputs predetermined OSD pattern data according to the date of use of the cleaning tape. As a result, the OSD pattern signal indicating the date of use of the tape and the reproduced video signal output from the amplifier 21 are mixed in the mixer 37 and transmitted to the TV through the output terminal P _out2 . As illustrated in (), a guide subtitle indicating the date on which the cleaning tape was finally used is output on the CRT screen. (ST 6)

Meanwhile, the microprocessor 33 subsequently checks whether the CTL signal is currently detected by the CTL head HD1 based on the data signal applied from the pulse determining unit 34 (ST 7). Is determined to be undetected, the microprocessor 33 temporarily stops the playback operation before the cleaning operation is executed (ST 8), and the OSD generator 36 Drive control to output a subtitle for confirming the user's intention to perform the cleaning function even when the guide subtitle is checked as illustrated in FIG. 5 (B). (ST 9)

Thereafter, the microprocessor 33 checks whether there is a function key re-entry of the user through the remote controller 28 (ST 10). At this time, if the function key input of the user is confirmed, the microprocessor 33 will execute the head cleaning function. It is determined that there is a and the head cleaning operation is performed by resuming the playback operation which was paused in step ST8. (ST 11)

On the other hand, if the user's reconfirmation key input is not detected in step ST 10, the microprocessor 33 determines whether a predetermined time has elapsed from the time when the user's pseudo-confirmation subtitle is output based on the count value counted by the timer 38. (ST 12), if the contracted time elapses without a key input, the OSD generating unit 36 outputs an OSD subtitle pattern indicating that the cleaning function is cancelled, and then the above-described series of cleaning operations are performed. (ST 13)

On the other hand, when it is confirmed that the head cleaning operation in the step ST 11 is completed (ST 14), the microprocessor 33 performs tape rewinding (ST 15), and then confirms whether the rewinding is completed. 16)

When it is confirmed that the rewind operation is completed, the microprocessor 33 reads out date data counted by the timer 38 (ST 17), and the date and time of use recorded on a predetermined portion of the tape based on the read date data. By updating and recording the information, the head cleaning function and the date of use recording operation through the cleaning tape are terminated. (ST 18)

That is, according to the above embodiment, the date of use of the cleaning tape is recorded on a predetermined portion of the tape using the CTL signal, and based on this, the user can be informed of the date of the final head cleaning prior to the head cleaning. do.

Meanwhile, 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 time for the user to perform head cleaning by recording the date of use of the cleaning tape in a predetermined portion of the tape, reading out the recorded information prior to the head cleaning, and outputting a guide subtitle. It will provide convenience for easy checking.

Claims (1)

A function selector for selecting a head cleaning function, A CTL head for recording and reproducing a control signal (CTL) of a duty ratio contracted according to a predetermined control command, A waveform shaping circuit for shaping the control signal (CTL) output from the CTL head into a square wave; A pulse judging unit outputting a predetermined code signal corresponding to the duty ratio based on the duty ratio of the signal output from the waveform shaping circuit; A date code information storage unit for storing, as data, tape use date information corresponding to the code signal with respect to the code signal detected by the pulse judgment unit; A timer for generating predetermined time data for counting the current time; An OSD generator for outputting a contracted OSD pattern signal according to a predetermined control command, A mixer for mixing and outputting the output signal and the reproduced video signal of the OSD generator; When the head cleaning function is selected through the function selection unit, the recorded information is read out prior to the cleaning operation and the guide subtitles are output. After the cleaning operation is executed by the user's reselection, the cleaning execution date is set to the predetermined tape. A video cassette recorder with a recording tape use date recording function, characterized in that it comprises a control unit controlling to update and record the portion.