KR19990032567A - How to control the number of times of TV tape test tape - Google Patents

Abstract

The present invention relates to a method of controlling the number of times of use of a test tape of a TVCR, and to a method of controlling the number of times of use of a test tape used for precise adjustment of a mass production TVCR. That is, in the present invention, when the state of the TVCR system is adjusted using a test tape, a control signal in which a duty ratio indicating the number of times of use generated in the system is changed is recorded on the test tape, When the number of tests reaches the limited number of times of use, the test is warned that the user has reached the limited number of times of use of the test tape, and the OSD screen indicating that the test tape is withdrawn is displayed on the screen of the receiver. This paper proposes a method of controlling the number of times the test tape is used by the TVCR, which is effective in preventing the TVCR system adjustment error and the user error caused by the excessive use of the tape.

Description

How to control the number of times of TV tape test tape

The present invention relates to a method of controlling the number of times of use of a test tape of a TVCR, and to a method of controlling the number of times of use of a test tape used for precise adjustment of a mass production TVCR.

In general, the TVCR is made of a TV (TELEVISION) and VCR (VIDEO CASSETTE RECORDER) as an integrated unit, and the system and the entire system of the TVCR (SYSTEM CONTROL; SYSCON) that is powered by a single power supply and controls the VCR. Each component is operated by a controlling timer (TIMER), which is used for recording and reproducing television broadcast signals, recording and reproducing other cassette tapes, broadcasting recording for other channels not being watched, scheduled recording, and absent recording. In the case of recording on a cassette tape, an AC bias method with low noise is adopted since there is no residual magnetic field due to a bias magnetic field even in the absence of a signal, and the recording of audio signals has a frequency range of 20-20000 Hz. The AC bias method is performed because it is relatively narrow to a degree and does not have to matter so much of the phase relationship. The. 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.

When the product is assembled and inspected in the general TVCR as described above, a test tape is used to precisely adjust the TVCR system. There is a problem that adjustment is not made.

Therefore, the present invention has been invented to solve the above problems, and an object of the present invention is to record the number of times of use by the coordinator until the limited number of times of use of the test tape when the coordinator adjusts the TVCR with the test tape, When used up to the limited number of times, using a test tape of the TVCR to output a warning message and withdraw the test tape to prevent the adjustment error of the TVCR system due to the overuse of the test tape of the coordinator Provides a number control method.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram for explaining a test tape usage count control method of a TVCR of the present invention.

2 is a flowchart showing a method of controlling the number of times a test tape is used in a TVCR according to the present invention;

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

Figure 4 is an exemplary view of the OSD screen means the warning of the limited number of times of use and withdrawal of the test tape 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 of controlling the number of times a test tape is used in a TVCR 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; Amplifying and processing the intermediate frequency signal, which is a composite video signal applied from the tuner unit 150, and outputs the composite video signal to the VCR Y / C IC 300, which will be described later. A TV image processing IC 250 for receiving a playback composite video signal and an OSD RGB signal from the VCR Y / C IC 300 and the OSD generator 550 and outputting the received composite video signal and the OSD RGB signal to the water pipe 200, respectively, and the TV. When the composite image signal is applied from the image processing IC 250, the luminance signal is FM low. A playback composite made by demodulating the modulated luminance signal and the color signal output from the head amplifier IC 350 connected to the VCR Y / C IC 300 to the original signal while performing low-frequency conversion on the carrier wave modulation and color signals. The video head 400 after amplifying the VCR Y / C IC 300 for applying a video signal to the TV image processing IC 250 and the luminance and color signals that are modulated from the VCR Y / C IC 300. And a head amplifier IC 350 for amplifying and demodulating the signal read by the video head 400, and the VCR Y / C IC 300 when the test tape is used. The system generates a control signal indicating the number of times of use of the test tape to be recorded on the test tape through the amplifying unit 650 and the control head 700 and applies a number of times determination signal to the timer 500 described later. 550, and the user keystroke In the case where the test tape is repeatedly played back by operating 450, the limited number of times signal stored in the YPIROM 750 is read and the OSD data signal is applied to the OSD generator 550. The timer 500 is configured to apply a control signal to the image processing IC 250.

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, and output to the TV image processing IC 250 to display a broadcast program received through the antenna on the screen of the water pipe 200. .

Here, when the user operates the key input unit 450 to adjust the state of the TVCR system with the test tape, the playback signal generated from the key input unit 450 is applied to the timer 500, and the timer 500 Causes the TVCR system to switch to playback mode. For reference, the test tape is a cassette tape used to adjust the state of the TVCR after the TVCR is assembled, and a special pattern for adjusting the TVCR is recorded.

At this time, the sheath 550 applies a control signal to the VCR Y / C IC 300 to receive a signal read by the video head 400 from the test tape through the head amplifier IC 350. After the FM-converted luminance signal and the low-converted color signal are demodulated to the original luminance signal and the color signal, a playback composite video signal is generated and output to the TV image processing IC 250 to be displayed on the water pipe 200. do.

In addition, the ciscon 550 generates a number of use signals of varying duty ratios to the control signal before the output of the signal recorded on the test tape is finished and taken out. 700). That is, the control head 700 records the number of use signals applied from the sheath cone 600 in the control track of the cassette tape.

On the other hand, when the use of the test tape by the user increases, the sheath cone 600 detects a control signal indicating the number of use signals recorded on the test tape, and then uses the number of times determination signal on the timer 500. Will be applied. Here, the timer 500 receiving the usage count determination signal from the scissor 600 compares the usage limit number stored in the YPIROM 750, and then the number of times of use of the test tape is equal to the usage limit number. In this case, after reading the usage limit number signal by applying a read enable signal (WE) to the ypyrom 750, the OSD generation unit 550 warns the limited number of times of use and OSD for drawing out a test tape. In addition to applying a data signal, a control signal is applied to the TV image processing C () so that a signal applied from the OSD generator 550 is displayed on the screen of the water pipe 200.

Therefore, the OSD generator 550 receives the OSD data signal for the warning of the limited number of times of use and the withdrawal of the test tape from the timer 500, and then outputs the OSD RGB signal to the TV image processing IC 250. The warning message indicating the warning of the limited number of uses and the withdrawal of the test tape is displayed on the screen of the water pipe 200.

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

The ciscon 550 serves as a relay between the user and the TVCR system. When the TVCR system is switched to the playback mode from the user's key input unit 450, a control signal is transmitted to the VCR Y / C IC 300. The test pattern signal recorded on the test tape is applied to the TV image processing IC 250 so that normal playback can be performed, and an electric signal corresponding to a function key operated by the user operating the key input unit 450 is applied. By detecting and applying a driving signal to the TVCR to operate each part constituting the TVCR according to a user-operated function, the operation state of the TVCR system is controlled so that the contents recorded on the test 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 controlling the progress of the tape by detecting the beginning and end of the test tape, and by detecting the progress of the test tape by detecting the rotation of the reel (not shown; reel) (Reel Sensor (not shown;) If the pulse generated is not detected within a certain period of time, the system automatically switches to stop mode, and the dew sensor (not shown; DEW SENSOR) is used to prevent damage to the running test tape due to high humidity in the TVCR system. When the humidity in the system rises above a certain level, the system automatically switches to the stop mode for the protection of the test tape, and when the drum (not shown; DRUM) rotates at a constant speed, it detects a 30 MHz signal and In case of occurrence, the TVCR system automatically performs a sensing function such as switching to the stop mode. .

Then, the head amplifier IC 350 connected to the VCR Y / C IC 300 amplifies the signal extracted from the cassette tape by the video head 400 by about 60 dB to demodulate and reproduce the original test pattern signal. do.

Next, FIG. 2 is a flowchart illustrating a method for controlling the number of times the test tape is used by the TVCR according to the present invention, wherein the power supply is switched on in order to adjust the state of the TVCR system using the test tape (S1). And a test mode step S2 for allowing a user to operate a key input unit 450 to reproduce the test pattern signal of the test tape after the TVCR power supply switching step S1, and in the test mode step S2. Before the reproduction of the test pattern signal recorded on the test tape is finished, the control signal applying step of applying the control signal indicating the number of times the scissor 600 changes the duty ratio (duty) to the amplifier 650 ( S3) and the control unit 700 is applied to the control head 700 by the amplifying unit 650 receiving the number of times of use signal from the scissor 600 in the control signal applying step (S3). Test number (A) recording step (S4) to be recorded in the rack, and after the test number signal is recorded on the test tape in the test number (A) recording step (S4), the recorded test number (A) is limited When the number of times of use of the test tape is determined to be the same as the number of times of limitation in the time limit determination step (S5) of determining whether or not the number of times of use, the warning that the OSD screen indicating a warning message is outputted The message output step (S6), after the warning message is output in the warning message output step (S6), the step of taking out the test tape (S7), and the number of times of use of the test tape in the limit frequency determination step (S5) If it is determined that is not equal to the limit number of times, the test is repeatedly performed with the test tape (S2).

Hereinafter, the operation after the test mode step S2 will be described in detail.

First, after all the test pattern signals recorded on the test tape are reproduced in the test mode step S2, the control signal having the duty ratio indicating the number of times of use generated from the sheath cone 600 before being taken out is changed. The amplifier 650 is applied to the amplifier 650, and the amplifier 650 amplifies the control signal to be recorded on the control track of the test tape through the control head 700.

In addition, after the test number A is recorded using the test tape as described above, and the TVCR system is adjusted, when the user operates the key input unit 450 to test with the test tape again, the sheath ( 600 detects the number of tests A recorded in the control track of the test tape, and then applies a usage count determination signal to the timer 500. That is, the timer 500 determines whether the test number A of the test tape used to adjust the TVCR is equal to the limited number of times stored in the EPI 750, so that the test number A is When the same number of times of use is the same, the OSD generator 550 applies the OSD data signal for warning of the limited number of times of use and withdrawal of the test tape, while applying a control signal to the TV image processing IC 250 to provide the OSD generator. Process the signal output from 550.

Here, the OSD generator 550 receiving the OSD data signal from the timer 500 generates an OSD RGB signal and outputs the OSD RGB signal to the TV image processing IC 250, thereby limiting the screen of the water pipe 200. An OSD screen is displayed indicating the number of warnings and the withdrawal of the test tape.

3A is a control signal of 30 Hz generated in the sheath cone 600 during normal playback, and FIG. 3B shows the number of test times A generated in the sheath cone 600 during playback of the test tape according to the present invention. As an example of a 30 Hz control signal, it is generated 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 as shown in FIG. 3B, the control signal of changing the duty ratio indicates that the current number of times of use is twice.

4 shows that when the test number A of the test tape according to the present invention is equal to the limited number of times of use, the user is warned that the use of the test tape has reached the limited number of times of use, and at the same time, the test tape is drawn out. It is an exemplary view in which an OSD screen is displayed on the screen of the water pipe 200.

As described above, in the present invention, when the state of the TVCR system is adjusted using a test tape, a control signal having a duty ratio indicating the number of times of use generated in the system is changed and recorded on the test tape. When the test tape A reaches the limited number of times of use, the OSD screen warns the user that the use of the test tape has reached the limited number of times of use and simultaneously draws out the test tape. By being displayed, there is an effect of preventing a user's mistake and an adjustment error of the TVCR system caused by the overuse of the test tape.

Claims (3)

In a TVCR which reproduces a signal recorded in a broadcast program and a test tape of a television on the screen of the receiving pipe 200, A TVCR power-on switching step (S1) in which the power is switched on to adjust the state of the TVCR system using a test tape; A test mode step S2 for allowing a user to manipulate a key input unit 450 to reproduce a test pattern signal of the test tape after the TVCR power supply switching step S1; Before the reproduction of the test pattern signal recorded on the test tape in the test mode step S2, the amplification unit 650 converts a control signal indicating the number of times the scissor 600 changes the duty ratio. A control signal applying step (S3) applied to the; In the control signal applying step (S3), the test frequency (A) is recorded to be recorded on the control track of the test tape by applying to the control head 700 the amplifying unit 650 receiving the use frequency signal from the scissor 600. Step S4, After the test count signal is recorded on the test tape in the test count (A) recording step (S4), the limit count determination step (S5) of determining whether or not the recorded test count (A) is a limited number of uses; A warning message output step (S6) of outputting an OSD screen indicating a warning message when it is determined that the number of times of use of the test tape is the same as the limited number of times in the limit number determining step (S5); And outputting a test tape at the same time as the warning message is output in the warning message output step (S6) (S7), and When it is determined that the number of times of use of the test tape is not the same as the number of times of limitation in the time limit determination step (S5), the method of controlling the number of times of use of the test tape of the TVCR comprising the step (S2) of repeating the test with the test tape. . The test tape of claim 1, wherein the time limit determination step (S5) and the warning message output step (S6) are performed by a timer (500) receiving a usage count determination signal from the scissor (600) used for TVCR adjustment. After comparing and determining whether the number of times of test A is equal to the limited number of times stored in the EPI 750, and if the number of times of test A is the same as the number of times of limited use, the number of times of limited use in the OSD generator 550 is determined. By applying the OSD data signal for the warning and the withdrawal of the test tape of the TVCR, the OSD screen displaying a warning of the limited number of times of use and the withdrawal of the test tape is displayed on the screen of the water pipe 200 How to control the number of test tapes used. The method of claim 1, wherein when the number of times of using the test tape is determined to be not the same as the predetermined number of test limits, the limit number determining step (S5) is performed until the predetermined number of test limits is reached by the user. A method of controlling the number of times a test tape is to be used in a TVCR, characterized in that the test tape is repeatedly played.