KR19990032570A - How to limit the number of recordings of a JRC tape - Google Patents

Abstract

The present invention relates to a method of limiting the number of recordings of a VCR tape, by using a recording and storing function of recording counts and a player OSD display function. It relates to a recording frequency limiting device of a VCR tape. That is, according to the present invention, the duty ratio of the control signal indicating the number of recordings on the cassette tape during recording is changed so that the duty ratio is stored in the recording and Y. pyrom, and then when the duty ratio is reproduced, the duty ratio is changed to the control signal. According to the OSD screen displaying the number of recording is displayed on the screen of the television, so that the user can quickly know the number of recordings to effectively manage the cassette tape, how to limit the number of recording of the VCR tape Presenting.

Description

How to limit the number of recordings of a JRC tape

The present invention relates to a method for limiting the number of recordings of a VCR tape, wherein the duty ratio of a control signal indicating the number of recordings on the cassette tape is changed to record and stored in the EPIROM after recording. The present invention relates to a method for limiting the number of recordings of a VCR tape such that an OSD screen displaying the number of recordings is displayed on the screen of the receiver in response to a control signal of which the duty ratio is changed.

In general, a VCR (VIDEO CASSETTE RECORDER) is a device used for recording and playing back a television signal, recording and playing back another cassette tape, broadcasting recording of another channel that is not viewed, and absent recording. In case of no signal at present, since there is no residual magnetism by bias magnetic field, AC bias method with low noise is adopted, and recording of audio signal is relatively narrow in frequency range of 20-20000Hz, and it is not a problem of phase relationship. Since it is not necessary, it is performed by the said AC bias method. However, the frequency modulation (FM) recording method has been adopted for recording video signals because its frequency range is wide, about 0-4 MHz, and strict phase characteristics are required to faithfully reproduce waveforms.

On the contrary, during reproduction, the recorded magnetic tape is driven while being connected to the gap of the magnetic head, and the signal read by the magnetic head is amplified and processed and reproduced through the water pipe and the speaker.

If the recording continues several times in the above-described general VCR, there is a problem that the image quality is degraded due to the decrease of the magnetic material of the tape and the wear of the VCR head. Also, the user cannot record the number of recordings on the tape several times. There is a problem in that the management of the tape is neglected since it is impossible to know exactly whether the recording is performed.

Accordingly, the present invention has been invented to solve the above problems, and an object of the present invention is to record a control signal indicating the number of recording times on a cassette tape during recording, and to record the number of recording signals on EPIROM. When playing back a tape, the OSD screen that displays the number of recordings by using the OSD function is displayed on the screen of the television, allowing the user to know the number of recordings quickly so that the tape can be better managed. To provide a limiting method.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram for explaining a method for limiting recording frequency of a VCR tape of the present invention.

2 is a flowchart for explaining a method of limiting the number of recordings of a VCR tape according to the present invention;

Figure 3 is a waveform diagram showing the number of recordings of the tape generated in the sheath according to the present invention.

<Description of Symbols for Main Parts of Drawings>

100: antenna 151: high frequency amplifier

152: mixing unit 153: local oscillation unit

200: Winner 250: TV image processing IC

300: VCR Y / C IC 350: Head Amplifier IC

400: video head 450: key input unit

500: timer 550: OSD generator

600: ciscon 650: amplification unit

700: control head 750: Y pyrom

Hereinafter, with reference to the accompanying drawings will be described a specific embodiment for achieving the above object of the present invention.

1 is a block diagram illustrating a method for limiting the number of recording times of a VCR tape of the present invention.

Referring to FIG. 1, the present invention provides a high frequency amplification unit 151 for amplifying a high frequency signal, which is a complex video signal received from an antenna 100, and an input signal and a local oscillation unit amplified from the high frequency amplification unit 151. A tuner unit 150 including a mixing unit 152 for receiving a local oscillation frequency from the 153 and converting it into an intermediate frequency, and a local oscillating unit 153 for supplying a signal for frequency conversion to the mixing unit 152; While amplifying and processing an intermediate frequency signal, which is a composite video signal applied from the tuner unit 150, to be output to the receiving pipe 200, and outputting a composite video signal to the VCR Y / C IC 300 to be described later. A TV image processing IC (250) for receiving a playback composite video signal from the VCR Y / C IC (300) and outputting the composite video signal to the water pipe (200), and a composite video signal from the TV image processing IC (250). Luminance signal is modulated by FM low carrier and color signal is low. While performing inverse conversion, a playback composite video signal generated by demodulating a modulated luminance signal and a color signal output from a head amplifier IC 350 connected to the VCR Y / C IC 300 into an original signal is processed. While amplifying the VCR Y / C IC 300 applied to the IC 250, the luminance signal and the color signal modulated from the VCR Y / C IC 300, and then recording them on the video head 400, A head amplifier IC 350 that reads, amplifies, and demodulates a signal recorded in the video head 400, and is connected to the VCR Y / C IC 300 to control the number of recordings during recording. Generates a signal to be recorded on the cassette tape (CASSETTE TAPE) and YPIROM 750 through the amplifier 650 and the control head 700, and applies a recording discrimination signal to a timer 500 to be described later, Sheath cone 550 for controlling the VCR Y / C IC 300 during recording and playback; When a user plays back a cassette tape recorded by operating the key input unit 450, the user records the number of recording signals stored in the EPI 750 to read the OSD generation control signal to the OSD generator 550. At the same time, a timer 500 for applying a control signal to the TV image processing IC 250 and a recording count signal from the sheath cone 600 are stored, while reading of the timer 500 is enabled. The signal WE is composed of an Y-pyrom 750 which outputs a recording count signal.

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

First, among the methods for receiving a broadcast signal using the tuner unit 150, the main method currently used is a FS (FREQUENCY SYNTHESIZE) method, and the FS method uses a timer to advance a reference frequency corresponding to each channel in advance. When the user tunes in a broadcast channel, the tuner 150 receives the broadcast by transmitting the reference frequency of the channel as data. Here, the components of the tuner unit 150 will be described in more detail. The high frequency signal received from the antenna 100 is characterized by the characteristic impedance of the feeder FEEDER through an input circuit (not shown) of the tuner unit 150. The input impedance of the high frequency amplifying unit 151 is matched and output to the high frequency amplifying unit 151. The high frequency amplifying unit 151 increases the gain of the received high frequency signal, improves selectivity, and prevents image interference. do. In addition, the S / N ratio is improved, and the local oscillation frequency output from the local oscillator 153 is prevented from being radiated to the antenna 100 to affect other receivers. In addition, the signal amplified by the high frequency amplifier 151 and the frequency output from the local oscillator 153 are input to the mixer 152, the mixer 152 mixes the high frequency signal and the local oscillation frequency To generate an intermediate frequency corresponding to the difference between the two frequencies.

Here, when the user operates the key input unit 450 to record a television broadcast program on a video cassette tape, the recording signal generated from the key input unit 450 is applied to the timer 500, and the timer 500 allows the television and the VCR system to switch to the recording mode. At this time, the video signal displayed on the water pipe 200 through the TV image processing IC 250 is transferred from the TV image processing IC 250 to the VCR Y / C IC 300 according to the control signal of the sheath 550. The VCR Y / C IC 300 converts the luminance signal of the video signal into the FM low carrier and the low frequency conversion of the color signal, and then the video head 400 through the head amplifier IC 350. To be recorded on the cassette tape.

In addition, the ciscon 550 generates a recording frequency signal of varying the duty ratio to the control signal during recording of a television broadcast program, and stores the recording frequency signal in the EPI 750 and the amplifying unit 650. It is applied to the control head 700 through. In other words, the control head 700 receives the number of recording signals from the sheath cone 600 and records them in the control track of the cassette tape.

On the other hand, after the recording is finished through the above process, when the user enters the playback mode by operating the key input unit 450, the sheath 550 applies a control signal to the VCR Y / C IC (300) The signal read by the video head 400 is applied through the head amplifier IC 350 so that the FM converted luminance signal and the low frequency converted color signal are demodulated into the original luminance signal and the color signal, and then a playback composite video signal is generated. By outputting to the TV image processing IC 250 to be displayed on the water pipe 200, while applying the recording discrimination signal to the timer (500).

In addition, the timer 500 receives the recording discrimination signal from the scissor 600, applies a read enable signal (WE) to the ypyrom 750 to read the recording count signal, and then displays the OSD generator ( The OSD generation control signal is applied to 550. Accordingly, the OSD generator 550 receives the OSD generation control signal from the timer 500 and outputs an OSD RGB signal to the TV image processing IC 250 to display the number of recordings on the screen of the water pipe 200. Is displayed.

Hereinafter, the operation of the sheath 550 will be described in detail.

The ciscon 550 serves as a relay between the user and the VCR set. When the system of the television and the VCR switches to the recording and playback mode from the user's key input unit 450, the VCR Y / C IC ( The control signal is applied to the control unit 300 so that the recording and playback of the video signal are normally performed, and the user manipulates each part constituting the VCR by detecting an electrical signal corresponding to a function key operated by the user by operating the key input unit 450. One function is to apply a drive signal to operate the VCR and to control the operating state of the VCR set so that the contents recorded on the cassette tape are not damaged. In addition, the sheath cone 550 controls the AC power supplied through the power cord by a power control signal, drives the loading motor to perform an operation when the cassette is taken out and inserted, and is operated by a key operated by a user. The loading mechanism is driven by sensing the state of the corresponding deck DECK to control the deck mechanism. In addition, by detecting the beginning and end of the cassette tape to control the progress of the tape, and detect the rotation of the reel (not shown; REEL) to check the progress of the cassette tape is generated from the reel sensor (not shown; RREE SENSOR) If the pulse is not detected within a certain period of time, the system automatically switches to the stop mode, and the humidity in the VCR set is increased by using the DEW SENSOR to prevent damage to the cassette tape while driving. If it goes above a certain value, it automatically switches the system to stop mode to protect the cassette tape, and automatically detects the 30MHz signal generated when the drum (not shown; DRUM) rotates at a constant speed. The sensing function such as switching to the stop mode is performed. In addition, in order to perform a function such as reservation recording, the timer 500 described below and data corresponding to the reservation recording are transmitted and authorized by serial data processing.

Here, the operation of the timer 500 for controlling the overall operation of the TV image processing IC 250 and the system will be described in detail.

First, when the television and the VCR system are switched to the recording and playback mode through the user's key input unit 450, the composite video signal is output from the TV image processing IC 250 to the VCR Y / C IC 300. While the control signal is applied to record the video, the playback composite video signal output from the VCR Y / C IC 300 is normally reproduced through the water pipe 200. In addition, by comparing the key that the user manipulated the key input unit 450 with a preset code to perform a function corresponding to the key, and to set and change the time using the clock (CLOCK) function, By using the clock function, the system transmits data with the sheath 550 during the scheduled recording and sets the recording start time and the recording end time to automatically record the current deck state or the sheath ( It detects the operation state of the 550 to be displayed on the display unit mounted on the TVCR system using the LED.

In addition, the head amplifier IC 350 connected to the VCR Y / C IC 300 mixes an FM modulated luminance signal and a low frequency converted color signal output from the VCR Y / C IC 300 and amplifies about 60 dB. While recording to the video head 400, the signal extracted from the tape by the video head 400 is amplified by 60dB again to be demodulated and reproduced with the original luminance signal and color signal.

2 is a flowchart illustrating a method for limiting the number of recordings of a VCR cassette tape according to the present invention, in which the power supply of the TV and the VCR is switched on in order to watch, record, and play a broadcast program of the television. (S1) and a first mode switching step (S2) in which a mode of the system is switched through a user's key input unit 450 while the TV and VCR power supply switching step (S1) is displayed while a broadcast program of the television is displayed; In the recording step (S3) where the mode switched to the first mode switching step (S2) is confirmed as the recording mode, and in the recording step (S3), the broadcast program of the television is recorded on the cassette tape (CASSETTE TAPE), A control signal applying step (S4) of applying a control signal indicating the number of recordings in which the sheath 600 changes the duty ratio to the amplifier 650, and the control signal applying step ( The recording frequency recording step (S5) and the recording frequency to be recorded on the control track of the cassette tape is applied to the control head 700 by the amplification unit 650 receives the recording frequency signal from the scissor 600 in S4), After the recording step S5, the recording count signal is stored in the Y pyrom 750 (S6), and the recording count signal is stored in the Y pyrom 750 in the storing step S6, and then the user's key input unit 450 A second mode switching step (S7) in which the mode of the system is switched through operation), a playback step (S8) in which the mode switched in the second mode switching step (S7) is confirmed as a playback mode, and the playback step ( In step S8, while a broadcast program recorded on the cassette tape is being reproduced, a recording count signal determining step (S9) for determining whether or not a recording count signal is recorded on a control track of the cassette tape, and discriminating the recording count signal Step (S9) When it is determined that the signal indicating the number of recordings is recorded by the sub-syscon 600, a recording discrimination signal applying step (S10) in which a recording discrimination signal is applied from the scissor 600 to the timer 500, and The recording count reading step (S11) in which the recording count signal stored in the EPI 750 is read by the timer 500 receiving the recording discriminating signal in the recording discrimination signal applying step (S10), and the recording count reading After the step S11, the timer 500 applies the OSD signal to the OSD generating unit 550, the OSD signal applying step (S12), and the OSD signal from the timer 500 in the OSD signal application step (S12) control OSD generation In step S13, the OSD generator 550 receiving the signal applies an OSD RGB signal to the TV image processing IC 250 to output an OSD screen indicating the number of recordings. The signal indicating the number of recordings by the sheath cone 600 is If it judged to be not registered, a step (S3) for repeating execution of recording of the television broadcast program.

Hereinafter, the operation after the recording step S3 will be described in detail.

First, while the broadcast program of the television is being recorded in the recording step S3, the sheath cone 600 applies a control signal having a duty ratio indicating the number of recording times to the amplifier 650. The unit 650 amplifies the control signal to be recorded on the control track of the cassette tape through the control head 700. At the same time, the ciscon 600 is also applied to the ypyrom 750 to be stored.

In addition, when the user operates the key input unit 450 in the recording state as described above to switch the mode so that the recorded cassette tape is played, the sheath cone 600 is recorded on the control track of the cassette tape. After the duty ratio detects the control signal, the recording frequency determination signal is applied to the timer 500. When the recording frequency determination signal is applied to the timer 500, the timer 500 applies a read enable signal WE to the ypyrom 750 to read the recording frequency signal, and then the TV image processing IC 250. The OSD generation control signal is applied to the OSD generator 550 connected to Accordingly, the OSD generator 550 generates an OSD RGB signal based on the OSD generation control signal applied from the timer 500 and outputs the OSD RGB signal to the TV image processing IC 250. On the screen, an OSD screen showing the number of recordings is displayed.

Figure 3a is a control signal of 30Hz generated in the sheath 600 during normal recording, Figure 3b is a 30Hz control indicating the number of recordings generated in the sheath 600 during recording according to the present invention as an example of the signal, This is caused by changing the duty ratio for the waveform of the control signal. That is, the method of changing the duty ratio is changed by a program input to the sheath cone 600, and the control signal of changing the duty ratio as shown in FIG. 3B indicates that the current recording is performed once.

Accordingly, the number of recordings as shown in FIG. 3B is generated in the scissor 600 during recording and recorded in the control track of the cassette tape, and is also stored in the ypyrom 750 and recognizes the control signal during playback. The 600 applies the recording discrimination signal to the timer 500, and the timer 500 receiving the recording discrimination signal from the scissor 600 reads the recording count signal stored in the EPI 750. After that, the OSD generator 550 is controlled to display an OSD screen indicating the number of recordings on the screen of the water pipe 200.

As described above, according to the present invention, the duty ratio of the control signal indicating the number of recordings is recorded on the cassette tape during recording so that the duty ratio is stored in the recording and EPI, and the duty ratio is changed during playback of the recorded cassette tape. The OSD screen displaying the number of recordings in accordance with the control signal is displayed on the screen of the television, so that the user can quickly know the number of recordings so that the tape can be better managed.

Claims (2)

In a television and a VCR for recording a broadcast program of a television on a display and a cassette tape in a receiving pipe 200 or playing back a recorded broadcast program, A TV and VCR power-on switching step (S1) in which the power of the television and the VCR is switched on in order to watch, record and play the broadcast program of the television; A first mode switching step S2 in which a mode of the system is switched through a manipulation of the key input unit 450 of the user while the TV and VCR power supply switching step S1 is displayed; A recording step (S3) in which the mode switched in the first mode switching step (S2) is confirmed as a recording mode; While the broadcast program of the television is recorded on the cassette tape in the recording step S3, a control signal is generated by the sheath cone 600 and applied to the amplifier 650 (S4). )Wow, After the control signal applying step (S4) and the control signal passing through the amplifier 650 is applied to the control head 700 recording frequency recording step (S5) and recorded on the cassette tape, After the recording frequency recording step (S5) and the recording frequency signal is stored in the EPIROM (750) (S6), A second mode switching step S7 of changing a mode of the system by operating the user's key input unit 450 after the recording number signal is stored in the YPIROM 750 in the storing step S6; A playback step (S8) in which the mode switched in the second mode switching step (S7) is confirmed as a playback mode; A recording count signal discriminating step (S9) for determining whether or not a recording count signal is recorded on a control track of the cassette tape while the broadcast program recorded on the cassette tape is being reproduced in the playing step (S8); If it is determined in the recording frequency signal determination step (S9) that the signal indicating the number of recordings is recorded by the scissor 600, the recording signal is applied to the timer 500 from the scissor 600 to the timer 500 Discrimination signal application step (S10), A recording count reading step (S11) in which the recording count signal stored in the EPI 750 is read by the timer 500 receiving the recording discriminating signal in the recording discriminating signal applying step (S10); An OSD signal applying step (S12) in which the timer 500 applies the OSD generation control signal to the OSD generator 550 after the recording frequency reading step S11; In the OSD signal applying step (S12), the OSD generation unit 550, which receives the OSD generation control signal from the timer 500, applies an OSD RGB signal to the TV image processing IC 250 to display the number of recordings. An output step S13, and If it is determined in the recording frequency signal determination step (S) that the signal indicating the recording frequency is not recorded, the recording of the television broadcast program is repeated (S3). How to limit the number of recordings. The method of claim 1, wherein the control signal applying step (S4) and the recording frequency recording step (S5) are performed by a control signal indicating the number of recordings by the sheath (600), that is, a program, while a television program is being recorded. Accordingly, a control signal in which the duty ratio is constantly changed is generated and applied to the amplifier 650, amplified through the amplifier 650, and then the control signal of the cassette tape is recorded by the control head 700. A method of limiting the number of recordings of a VCR tape, which is recorded on a control track.