KR19980030891A - Head Cleaning Tape Count Recorder - Google Patents

Abstract

The present invention relates to a head cleaning tape count recording device which records the number of times the head cleaning tape is used in a predetermined portion of the tape by using the CTL signal, and informs the user of the number of times the tape is used every time the tape is used. And a function selection section 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, and a control signal CTL output from the CTL head. A waveform shaping circuit for shaping a wave shape, a pulse judging outputting a predetermined code signal corresponding to the duty ratio based on the duty ratio of a signal output from the waveform shaping circuit, and a code signal output from the pulse judging circuit Code information storage unit for storing tape count data corresponding to the code signal. An OSD generator for outputting a predetermined OSD pattern signal indicating the number of times; a mixer for mixing and outputting an output signal and a playback video signal of the OSD generator; and a head cleaning function when a head cleaning function is selected through the function selection unit. And a control unit which controls to read and update the tape count based on the code data applied from the pulse determining unit.

Description

Head Cleaning Tape Count Recorder

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette recorder, and more particularly, to record the number of times the head cleaning tape is used on a predetermined portion of the tape by using the CTL signal, and to inform the user of the number of times the tape is used every time the tape is used. A cleaning tape recording frequency recording apparatus.

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 remote control of 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. A microprocessor serving as a control unit for controlling the operation of the entire apparatus based on the code signal output from 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.

The control signal CTL is a signal used as a basis for the VHS (VHS Index Search System) for controlling the phase of the capstan motor and marking the beginning of the tape. By recording the CTL peak signals at a predetermined interval on a predetermined portion of the tape as shown in Fig. 2), and during peak playback, the peak signals are waveform-shaped to determine their duty ratios as shown in Fig. 3B. It is to confirm the information recorded in.

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 image quality during playback and damage to the head and tape. To prevent this, cleaning tapes are generally used in each home. . The cleaning tape used to clean the head of the VCR is limited to a predetermined number of times when the product is shipped from the factory. If the cleaning tape is used more than this, the head may be worn out. Since there was no function of notifying the number of times of use, the number of times of use of the cleaning tape sometimes exceeded, causing the head of the VCR to be severely damaged.

The present invention was created in view of the above circumstances, and records the number of times the head cleaning tape is used in a predetermined portion of the tape using the CTL signal, and based on this, the user can be notified the number of times the tape is used at each point of use of the tape. It is an object of the present invention to provide an apparatus for recording the number of times the head cleaning tape is used.

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

Fig. 2 is a block diagram showing the internal structure of a VCR to which a head cleaning tape count recording function according to an embodiment of the present invention is added.

Fig. 3 is a diagram illustrating an example of recording CTL information according to the tape usage count.

4 is a diagram illustrating an output state of a guide subtitle indicating the number of times tape is used.

*** 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: code information storage unit 36: OSD generation unit

37: Mixer HD1: CTL head

HD2: Audio Head

The head cleaning tape recording frequency recording apparatus according to the present invention for realizing the above object comprises a function selecting section for selecting a head cleaning function, and recording and reproducing a control signal (CTL) of a duty ratio contracted according to a predetermined control command. A CTL head, a waveform shaping circuit for shaping the control signal CTL output from the CTL head into a square wave, and 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 code information storage unit for storing the tape count data corresponding to the code signal with respect to the code signal output from the pulse determiner, and outputting a predetermined OSD pattern signal indicating the tape count according to a predetermined control command. Through an OSD generator, a mixer for mixing and outputting the output signal and the reproduced video signal of the OSD generator, and the function selection unit When the head cleaning function is selected, the control unit performs a head cleaning operation through a reproducing operation and controls to read and update the tape count based on code data applied from the pulse determining unit. do.

That is, according to the present invention having the above-described configuration, the control unit executes the head cleaning operation through the reproducing operation when the head cleaning function is selected by the user and on the CRT screen based on the data read out by the CTL head. By outputting a guide subtitle of the tape usage count and updating the tape usage information after the cleaning operation is completed, the user can check the tape usage count so far whenever the cleaning tape is used.

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 to which a cleaning tape count recording function according to an embodiment of the present invention is added. 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 A receiving unit for converting and outputting an electric code signal, 33 is a control unit for controlling the overall device and the function of recording or reading the data according to the number of times of use on a 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 from the microprocessor 33, and reference numeral 30 denotes the CTL under the control of the microprocessor 33. A CTL head driver for driving control of the head HD1, 31 is an amplifying part for amplifying a signal detected by the CTL head HD1, and reference numeral 32 is amplified by the amplifying part 31 using a Schmitt trigger or the like. A waveform shaping circuit for shaping the control signal CTL into a square wave, and reference numeral 34 receives a square wave pulse output from the waveform shaping circuit 32 and applies the square wave pulse to the corresponding duty ratio based on the duty ratio of the pulse. The pulse judging unit outputs a corresponding digital code signal.

Reference numeral 35 is a code information storage unit for storing the number of times of use of the tape means that the code signal means with respect to the code signal detected by the pulse determination unit 34, 36 is the microprocessor 33 OSD generation section for outputting the hue signal (R, G, B) and blanking signal (Y ') of the predetermined OSD pattern according to the control, 37 from the output signal of the OSD generating section 36 and the amplifier 21 It is a mixer that mixes the output video signal output and transmits it to a video output device such as a TV through the connection port (P _out2 ).

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

When the user selects a function key included in the remote control device 28 while the head cleaning tape is inserted into the deck (not shown), the microprocessor 33 once rewinds the tape to the initial position, The reproducing operation is executed. At this time, the number of times of usage information recorded in the predetermined portion of the front of the tape is read out by the CTL head HD1.

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 binary data '0', respectively, and outputs a digital code signal according to the duty ratio. The microprocessor 33 performs the pulse based on the data stored in the code information storage unit 35. The code signal applied from the determination unit 34 is determined to read the tape count 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 outputs predetermined OSD pattern data according to the number of times the tape is used. The OSD pattern signal and the reproduced video signal output from the amplifying unit 21 are mixed in the mixer 37 and transmitted to the TV through the output terminal P _out2 , thereby as shown in FIG. 4. On the screen, a guide subtitle indicating the number of times of tape use is output.

On the other hand, the microprocessor 33 performs a cleaning operation of various heads including the recording / reproducing head 6 and the audio head HD2 through a reproducing operation, and then returns a tape when the cleaning operation is completed. The head cleaning operation is completed by ejecting the tape after updating and recording the data by adding the number of times of use to the CTL information of the portion where the number of times of use of the tape is recorded.

That is, according to the above embodiment, the number of times the head cleaning tape is used is recorded in a predetermined portion of the tape by using the CTL signal, and the number of times of use of the tape can be informed to the user every time the tape is used.

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, the present invention enables the user to check the number of times the head cleaning tape is used, thereby preventing the problem of excessively exceeding the number of times the tape is used to damage the head.

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 code information storage unit for storing tape count data corresponding to the code signal with respect to the code signal output from the pulse judgment unit; An OSD generator for outputting a predetermined OSD pattern signal indicating the number of times of tape use according to a predetermined control command; A mixer for mixing and outputting the output signal and the reproduced video signal of the OSD generator; If the head cleaning function is selected through the function selection unit, the controller performs a head cleaning operation through a reproducing operation, and controls to read and update the tape count based on code data applied from the pulse determining unit. Head cleaning tape recording frequency recording device, characterized in that configured to.