KR19990043338A - How to release child lock signal of composite television - Google Patents

Abstract

The present invention relates to a composite television for releasing a specific control signal recorded on a control track of a video tape played back in a TVCR (Video Cassette Recorder). In most cases, child lock signals are recorded on adult video tapes, which are difficult for minors to see. Accordingly, the present invention relates to a method of releasing a child lock signal recorded as described above. In particular, the control lock head detects a child lock signal and a synchronization signal recorded on a video tape, and the hexacode is in the state of the child lock in the CTL processing unit. The child lock recording signal is released by converting from 'BB' to the hexacode 'BA' in the child lock release state and recording the pulse again. Accordingly, in the present invention, a method for releasing a child lock signal of a composite television for releasing a child lock signal to play a videotape as described above is provided.

Description

How to release child lock signal of composite television

The present invention relates to a method of releasing a child lock signal recorded on a video tape reproduced by a VCR (Video Cassette Recorder) included in a composite television, and in particular, a sync signal and a child lock signal recorded on a control track of a video tape by a control head. The present invention relates to a method for releasing a child lock signal of a composite television that detects and releases the child lock signal in the CTL processing unit and records the released state in a control track so that the video tape is played back when the video tape is played.

The child lock signal is recorded by changing the duty ratio of the control pulse in the area where the control signal of the adult videotape is recorded in order to protect the minor from the adult videotape. In other words, it is a minor prohibition signal, hereinafter referred to as child lock.

In general, the TVCR, which is a composite television, is an integrated type of a TV (Television) and a Video Cassette Recorder (VCR), and is supplied with a single power supply and is controlled by a system control (hereinafter referred to as Syscon). ) And a timer microcomputer (hereinafter referred to as timer [Timer]) that controls the entire system of TVCR. Each component is operated, and recording and playback of television broadcast signals, recording and playback of other cassette tapes, As a device used for broadcast recording, reservation recording, and absence recording of a channel, an AC bias method with low noise is adopted because there is no residual magnetic field due to a bias magnetic field even when recording on a cassette tape. The recording of the audio signal is relatively narrow in frequency range of 20-20000 Hz, and the phase relationship is not a problem. This being done the alternating-current bias method because. 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 other hand, recording a television signal using a VCR is to record a control signal for generating an audio signal, a video signal of a television, and various control signals at the time of reproduction at different positions of the video tape. The configuration of the VCR for recording each of the above signals on a video tape is as follows.

1 is a block diagram of a recording unit of a VCR for recording a television signal on videotape. The configuration for recording the audio signal of the television, the configuration for recording the video signal, and the configuration for recording the control signal are divided. The recording apparatus is provided with an audio signal processing unit 1 for receiving an audio signal input from a television or the like and processing the signal into a type of signal suitable for recording on magnetic tape. An audio signal recording unit comprising an additional oscillator 2 and an audio head 3 for recording the audio signal output from the oscillator 2 on magnetic tape; A composite video signal processor 4 for IF amplification and Y / C separation processing of a composite video signal input from a television, etc., and a luminance signal processor for FM modulation and processing the luminance signal output from the composite video signal processor 4 above; 5) and an FM modulator 6, a color signal processor 7 and a low pass converter 8 for performing low-pass conversion on the color signal output from the composite video signal processor 4, and the FM converter 6 above. A video recording unit comprising a mixing unit 9 for mixing the luminance signal output from the low frequency conversion unit 8 and a color signal output from the low pass conversion unit 8, and a video head 10 for recording the video signal mixed in the mixing unit 9; A vertical synchronous signal processing unit 11 for processing a vertical synchronous signal input from a television or the like, a countdown 12 for downgrading the vertical synchronous signal input from the vertical synchronous signal processing unit 11 to 1/2, and And a control recording section composed of a control head 13 for recording a control signal capable of generating various control signals at the time of reproduction of the videotape by means of the countdown 12 signal.

FIG. 2 is a diagram relating to a recording state of a video tape recorded by the recording apparatus of FIG. When the video tape reproduces the audio signal recorded in the longitudinal direction and the recorded video tape at a position corresponding to the video signal recorded in the edge musque manner in the longitudinal direction on the entire tape and the video signal recorded at the upper end of the tape, A control signal recorded in the longitudinal direction of the tape is recorded to generate a control signal capable of performing a convenient function or the like.

In some cases, a child lock signal is recorded on an adult video tape recorded by such a recording device to protect minors.

The present invention is to release the child lock signal recorded on the adult video tape as described above, the object of the present invention is to detect the child lock signal recorded on the control track of the video tape through the control head and the detected child lock signal The present invention provides a method for releasing a child lock signal of a composite television that processes a signal as a release signal in the CTL processing unit and records the signal as a control track.

1 is a block diagram of a recording apparatus of a general VCR.

2 is a diagram for explaining a recording state of a video tape;

3 is a block diagram schematically showing a child lock signal releasing device of a composite television according to the present invention;

4 is a state diagram showing a child lock recording state and a release state;

5 is a flowchart illustrating a method for releasing a child lock signal of a composite television according to the present invention.

* Explanation of symbols for main parts of the drawings

100: tuner circuit section 110: intermediate frequency IC section

120: chroma IC unit 130: color signal driver

140: Winner 150: Timer

160: remote controller 170: VCR Y / C IC unit

180: ciscon 190: CTL processing unit

200: signal recording section 200a: head amplifier IC section

200b: video head 200c: audio processing IC unit

200d: Audio head 200e: Control amplifier

200f: control head 190a, 191: synchronization signal

190b: child lock code 192: child release

Hereinafter will be described in detail with reference to the accompanying drawings for the configuration and operation of the embodiment for achieving the above object of the present invention.

3 is a block diagram of a child lock signal releasing device of a composite television according to the present invention.

The present invention provides a high frequency amplifying unit for amplifying a high frequency signal, which is a composite video signal received from an antenna, a mixing unit for converting an input signal amplified from the high frequency amplifying unit and a local oscillation frequency from a local oscillating unit to convert to an intermediate frequency and the mixing unit. A tuner circuit section 100 composed of a local oscillation section for supplying a signal for frequency conversion to the apparatus; An intermediate frequency IC unit 110 connected to the tuner circuit unit 100 and amplifying and processing an intermediate frequency signal which is a complex video signal applied from the tuner circuit unit 100; A chroma IC unit 120 connected to the intermediate frequency IC unit 110 and performing color demodulation processing on a composite video signal applied from the intermediate frequency IC unit 110; The color signal driver 130 and the color signal driver 130 which are connected to the chroma IC unit 120 and perform a driving operation to display the RGB output color signal of the chroma IC unit 120 on the water pipe 140. An image tube 140 on which an image signal is displayed;

On the other hand, the remote controller 160 having a power button and child lock release button so that the user can operate when watching the video tape of the composite television; By detecting the electrical signal corresponding to the button selected by the user in the button provided on the remote controller 160 generates a predetermined control signal and outputs it to the chroma IC unit 120 and at the same time the scissor 180 and A timer 150 that interfaces to control the complex television system; A scissor 180 connected to the timer 150 and applying a control signal to each block unit of the VCR required by the present invention according to a control signal through an interface with the timer 150;

A video head (200b) which reads out a video signal from a video track of the video tape when the video tape is reproduced; A head amplifier IC unit 200a connected to the video head 200b for amplifying a video image signal applied from the video head 200b to increase an output specification; An audio head (200d) which reads out an audio signal from an audio track of the video tape when the video tape is reproduced; An audio processing IC unit 200 connected to the audio head 200d and processing an audio image signal applied from the audio head 200d; A control head (200f) for reading a child lock signal recorded in a control track of the videotape and a synchronization signal thereof from the videotape; A control amplifier 200e connected to the control head 200f and amplifying a child lock signal and a synchronization signal applied from the control head 200f; It is connected to the head amplifier IC unit 200a and the audio processing IC unit 200c, and demodulates the video image signal applied from the head amplifier IC unit 200a and the audio / audio signal applied from the audio processing IC unit 200c. And the VCR Y / C IC unit 170 output to the chroma IC unit 120.

Referring to FIG. 3, first, a method mainly used for receiving a broadcast signal using the tuner circuit unit 100 is a frequency synchronization method (FS), and the FS method uses a timer for each channel. When a user inputs a reference frequency corresponding to the user and selects a broadcast channel, the tuner circuit unit 100 receives the broadcast by transmitting the reference frequency of the corresponding channel as data. That is, the tuner circuit unit 100 that receives the broadcast signal in the above-described manner generates and outputs an intermediate frequency of the broadcast signal, and the intermediate frequency IC unit 110 receives the intermediate frequency output from the tuner circuit unit 100 as an input. Amplifies the applied intermediate frequency to increase sensitivity and increase selectivity to increase image output. In addition, the image signal output from the intermediate frequency IC unit 110 is input to the chroma IC unit 120 and processed as a signal suitable for displaying a composite video signal on the water pipe 140, and the chroma IC unit ( The RGB color signal processed and output by the color signal 120 is performed to display the RGB color signal from the color signal driver 130 on the water pipe 140.

The above description is a block diagram illustrating a process of displaying a composite video signal transmitted from a broadcasting station on a water pipe. Hereinafter, a method for releasing a child lock signal of a composite television according to the present invention may include a power button and a child. A release button for releasing the lock signal is provided, and when the release button of the remote controller 160 is selected, the timer 150 detects an electrical signal corresponding to the release button to provide an interface with the sheath cone 180. The control signal is applied to the sheath cone 180. When the child lock release signal is applied through the interface with the timer 150, the sheath controller 180 applies a control signal for detecting a sync signal recorded in the control recording area of the adult video tape and a code signal for the child lock. do. That is, the control head 200f reads the control signal recorded in the control signal recording area of the video tape from the control signal. The control amplifier 200e amplifies the control signal read by the control head 200f. The amplified signal is input to the ciscon 180, and the CTL processing unit 190 detects the synchronization signal and the child lock signal from the ciscon 180 to release the signal. That is, for the sake of clarity, FIG. 4 will be described. FIG. 4 is a state diagram of the synchronization signal 190a and the child lock signal 190b detected from the control area of the video tape. If the signal is defined as hexadecimal 'FF', that is, it is represented as '11111111' in binary, and the child lock signal is defined as 'BB' as hexacode, it is '10111011' in binary. Accordingly, the CTL processing unit 190 uses the same hexacode as 'FF' to detect and release the child lock signal recorded as 'BB', and the child lock signal is a hexacode in one embodiment. The child lock recording signal is released by redefining with 'BA', that is, binary 1010 1010 and Don't care.

On the other hand, the video head 200b reads the video signal recorded on the video tape, and the audio head 200d reads the audio signal recorded on the video tape. The video signal read by the video head 200b is amplified by the head amplifier IC unit 200a, and the audio signal read by the audio head 200d is applied to the audio processing IC unit 200c to process voice signals. The output signals of the head amplifier IC unit 200a and the audio processing IC unit 200c are applied to the VCR Y / C IC unit 170 and demodulated, and then subjected to the water pipe 140 through the chroma IC unit 120. Is displayed.

5 is a flowchart illustrating a method for recording a child lock signal of a composite television according to the present invention, which will be described in detail below.

First, the flowchart is a process of switching on the state of the composite television power supply to release the child lock signal (S100), and whether the user has selected the play button provided on the remote controller 160 in the on-switched state. Play button input check step (S200) to confirm, VCR playback step (S300) for playing the VCR if there is an input of the playback button from the process, and child lock release signal detection for detecting the child lock release signal from the VCR playback process Process (S400), and if the child lock release signal is detected from the above, operating the CTL with the release signal and don't care for the child lock signal, and then recording (S500), and powering the power from the power key input unit. When the key is input, the process is performed to switch off the power (S600, S700).

Referring to the flowchart of the child lock signal recording method of the composite television as described above, in the power-on switching process (S100), the user is switched on using the power button provided on the front of the remote controller and the composite television.

In the play button check process (S200), the timer 150 also detects that the user selects the play button provided in the remote controller 160.

In the VCR playback process (S300), when the play button is input from the above, the video tape of the VCR included in the composite television is played.

In the child lock signal detection process (S400), the control head 200f detects the child lock signal recorded in the control area of the video tape, amplifies it in the control amplifier 200e, and then applies a signal to the scissor 180.

Meanwhile, in the CTL operation and recording process (S500), the CTL processing unit 190 detects the hexacode of 'FF', which is a synchronization signal for the child lock signal, and the child lock signal, 'BB', from the sheath system 180. After the operation is performed with the hexa code and don't care of the release signal 'BA', the control head 200f records the control track of the videotape with the synchronization signal of the 'FF'.

In the power key input and power off switching process (S600, S700), when the user selects a power button provided at the front of the remote controller 160 and the composite television, the composite television is switched off.

As described above, the present invention generates a child lock release signal and a synchronization signal in a CTL processing unit that receives a control signal of a timer and a scissor, and processes the signal as a recordable signal from a control amplifying unit through a control head. By recording the sync signal and the child lock release signal on a control track in which the control signal of the video tape is recorded, the video tape can be reproduced without confirming the password.

Claims (2)

In a composite television that releases a child lock signal and a synchronization signal for prohibiting minor viewing recorded on a control track of an adult video tape, Switching power on to release the child lock signal and the synchronization signal; When the play button is applied, the process of playing the VCR, Detecting a child lock signal recorded on a control track of a video tape from the VCR playback process; A CTL operation and recording process of manipulating the control signal for the child lock signal detected in the above process to make a release signal and recording it on a video tape; When the user has a power key input, the child lock signal release method of a composite television, characterized in that the process of switching off the power. The CTL operation and recording process according to claim 1, wherein the CTL operation and recording process is performed by the 'FF' synchronization signal and the 'BA' child lock release signal from the 'FF' synchronization signal and the 'BB' child lock signal. The child lock signal release method of the composite television, characterized in that for generating and recording as a control track of the video tape through the control head (200f).