KR100210196B1 - Method for producing test signal in vcr - Google Patents

Abstract

The present invention proposes a technique for automatically generating a test bar signal for RF matching with a television in a vise initialization step without a separate switch organization.

To this end, the present invention includes a step of recognizing an initial power-on mode of a vial to judge whether or not to execute an RF matching operation between a vial and a television, and a step of determining whether a vial power- Generating a test bar signal by the OSD control unit 50 to disable test signal generation if the playback mode is set and outputting a test bar signal to the television screen if the playback mode is not set; Converting the test bar signal generated by the OSD control unit 50 into an RF signal and transmitting the RF signal to an antenna end of the TV; and performing RF matching between the television and the V-SIR using the test bar signal, And releasing the test bar signal.

The present invention enables the cost reduction effect of eliminating the test bar selection switch and the RF matching operation with the television at the time of initializing the vial to be conveniently and accurately executed.

Description

How to output Vishial's test signal

The present invention relates to an RF modulator for outputting video and audio signals of a Vishal through an air channel of a television, and more particularly, to an RF modulator for outputting a Vishal RF output channel frequency and a Vishal And a test signal output method.

The reproduction signal of the video tape reproduced by the Vsial or the broadcasting signal selected by the tuner in the Vsial is transmitted to the television set through the A / V cable or the RF cable, and is outputted as image and sound through the cathode ray tube and the speaker.

Here, RF modulators are essential in the vial to couple Vishal and television sets with RF cables.

FIG. 1 is an internal circuit diagram for explaining the operation of a common Vsial.

As will be seen here, the Vishill circuit is largely divided into a main PCB 100 and a logic PCB 200. The main PCB 100 includes a power supply unit 110, a voice recording and reproducing unit 120, a timer system control unit 130, an image recording and reproducing unit 140, and the like.

The power supply unit 110 includes a noise filter 111 disposed on a power supply line to remove a noise component included in an AC input voltage input through the power cord 114, A switching circuit 112 for generating a high-frequency switching voltage to obtain a high-quality voltage from the voltage, and a constant-voltage circuit 113 for generating a stable Vsial circuit operating voltage in response to the switching voltage output from the switching circuit.

The audio recording and reproducing unit 120 amplifies the audio signals read by the audio head 174 and amplifies the output signals of the equalizing amplifier 123 and amplifies the output signals of the A / V jack 180 And a line amplifier 121 for amplifying and outputting a voice input signal of the voice input terminal of the A / V jack and the voice input terminal of the scart jack by transmitting the amplified voice output signal to the voice output terminal 182 and the scoot jack 190, And a recording amplifier 122 for amplifying the output signal of the line amplifier 121 and outputting the amplified output signal to the audio head 174.

The timer circuit control unit 130 receives a timer 132 and a timer 132 for receiving data from the remote control receiver 220 in the logic PCB 200 and transmitting and receiving data through the Digitron driver 230, A system controller 131 for inputting a switch signal from the cam switch 170 and a drive motor 171, a capstan motor 172, A drive servo 133 for driving the motor 173, a capstan servo 134, and a loading motor driver 135.

The video recording and playback unit 140 includes a signal path composed of an LPF 141, a preamplification circuit 142 and an FM modulator 143 for recording an incoming video signal from the input selector 165, , An AIC (Automatic Chroma Level Control) 146, and a converter 147, and a first mixer 144 for mixing the two signals passed through these signal paths and transmitting them to the head amplifier module 160 side do.

The video recording and playback unit 140 includes a signal processing path of the head amplifier module 160 including a DOC 148, a demodulator 149 and a de-emphasis circuit 150 and a signal processing path of the converter 152 and the BPF 153, A second mixer 151 for mixing the signal processing pass of the head amplifier module and the video signal passed through these two signal paths and a reproduction amplifier 154 for amplifying the video reproduction signal outputted from the second mixer do.

The head amplifier module 160 has two or four image heads 175.

The video reproduction signal output from the video recording and playback unit 140 is output to the video output terminal 181 of the A / V jack 100 via the oscillation circuit 161 and the other part is output to the video output terminal 181 of the RF modulator 164 Modulated and output to the RF output terminal 196. [

Meanwhile, the RF signal input to the antenna input terminal 195 of the RF modulator 164 is converted into an image and a voice signal through the tuner 163 and the IF block 162, And the video and audio input terminals 183 and 184 of the A / V jack 180 are connected to one end of each of the first and second switches 166 and 167 of the input selector 165, And a video / audio signal input through the video and audio input terminal of the jack 190 are connected to each other.

The audio signal and the video signal output from the first and second switches 166 and 167 of the input selector 165 are supplied to the line amplifier 121 of the audio recording and reproducing unit 120 and the LPF 141 of the video recording and reproducing unit 140 ), And connects to the BPF 145 for transmission.

The logic PCB 200 is provided with a key matrix 240 for inputting a tissue key signal provided on the external front panel of the vial and a key input signal from the key matrix 240, A digitron driver 230 for transmitting and receiving data to and from the timer 132 of the digitizer driver 130 and a digitron driver 230 for displaying various characters and numbers according to the output of the digitron driver 230, And a remote control receiver 220 receiving the control key input signal from the remote controller and transmitting the corresponding control data to the timer 132.

The operation of the Vssial circuit thus constructed will be described as follows.

The power supply unit 110 of the main PCB 100 to supply the stabilized operating voltage to each part of the Vsial is connected to the power supply unit 110 through the noise filter 111, the switching circuit 112 converts the input voltage frequency into a high frequency of several tens of KHz, converts it into a switching voltage of a required size, and transmits it to the constant voltage circuit 113.

Thus, the constant voltage circuit generates a stable operation voltage to be supplied to each part of Vsial.

When the operating voltage is applied to the Vsial, the audio and video signals selected by the audio and video switches 166 and 167 of the input selector 165 are supplied to the audio recording and playback unit 120 and the video recording and playback unit 140, respectively .

The voice switch 166 of the input selector 165 selects a voice signal coming from the voice input terminal of the scart jack and the A / V jack and the voice signal generated from the IF block 162, Selects the video signal of the video tape input through the video input terminal of the scart jack and the A / V jack and the error broadcast video signal generated in the IF block 162.

A channel selection signal from the tuner 163 is applied to the IF block 162 and an A / V signal or an antenna input terminal 195 modulated to an RF signal by the RF modulator 164 is input to the tuner 163 The input antenna signal is applied.

The audio signal applied to the audio recording and reproducing unit 120 is amplified by the recording amplifier 122 through the line amplifier 121 and then transmitted to the audio head 174 so that the audio signal is recorded on the video tape.

The video signal applied to the video recording and playback unit 140 is supplied to the first signal path including the LPF 141, the preamplification circuit 142 and the FM modulator 143, the BPF 145, the ACC 146, 147 are applied to the head amplifier module 160 having two or four image heads 175 mixed in the first mixer 144, On the video tape.

Conversely, the audio reproduction signal on the video tape read by the audio head 174 passes through the equalizing amplifier 123 and the line amplifier 121 of the audio recording and reproducing section 120 in order, and is supplied to the A / V jack 180 and the scart jack The video signal on the video tape read by the video head 175 is output to the A / V converter 190 through the head amplifier module 160, the video recording / playback unit 140 and the oscillation circuit 161, And is output to the respective video output terminals of the jack 180 and the scart jack 190.

The audio output signal of the audio recording and reproducing unit 120 and the video output signal of the video recording and playback unit 140 which has passed through the oscillation circuit 161 are modulated into RF signals by the RF modulator 164 and output to the RF output stage 196 do.

The key input signal on the front panel of the vial that enters the key matrix 240 on the logic PCB 200 is input to the remote control receiver 220 through the digitizer driver 230 and the timer 132 in the timer control unit 130, And the display signal generated by the timer 132 is displayed on the Digitron 210 through the digitron driver 230. The digital signal is then supplied to the system controller 131,

The system control 131 is controlled by the drum servo 133 and the capstan servo 132 in accordance with the vise control signal from the remote control receiver or key matrix inputted through the timer 132 and the control signal input from the cam switch 170 provided in the mechanical system. The capstan motor 172 and the loading motor 173 via the loading motor driver 135 and the loading motor driver 135. [

As described above, the Vishal RF modulator converts the video and audio signals reproduced from the video tape into RF signals and transmits them to the antenna terminals of the television set. In case of domestic use, the output of the Vishal RF modulator is channel 3 or channel 4, in Japan, it is set to channel 1 or channel 2, and in Europe, it is set to channel 36.

Therefore, in order to view a video tape or the like by connecting an RF cable to an antenna end of a television after a customer purchases a Vishial, the user first selects a channel of the television on the RF output channel of the Vishal RF modulator , A fine tuning step is performed to match the frequency band of the RF channel of the selected vial with the frequency band of the corresponding channel of the television.

The adjustment of the RF channel matching between the vial and the television may vary depending on the tuning method of the television which the user has.

For example, in the case where the tuning method of a television possessed by a consumer is a frequency synthesizing method (FS system) using a microcomputer, data having a value exactly synchronized with the RF channel frequency of the corresponding vial is previously registered in the microcomputer of the television tuner Therefore, the user can simply tune in to a television channel (channel 3 or channel 4 in the case of domestic use), and the television and vial are automatically connected to the RF.

In contrast, in a voltage tuning system (VS system), which is adopted in most televisions, if a signal is not outputted from Vsial, it is impossible to confirm whether Vsial and TV are RF-matched. In this case, In order to facilitate adjustment of the initial RF matching with the television, a test signal is generated by operating a test switch provided on the Vsial side, and the signal is received to adjust the frequency of the channel selection channel of the television to the RF output of the Vsial .

FIG. 2 is a waveform diagram of a test signal output from the test signal generating circuit of the Vishal. This signal is applied to the antenna side of the television through the RF modulator.

As shown in FIG. 3, such a test signal appears as a black / white bar on the television monitor.

Up to now, in the case where a test signal generating circuit is installed in an RF modulator of a Vsial, a test signal is generated through operation of a slide switch provided on one side of a Vsial, or a test signal is generated through a microcomputer operated by a remote controller .

In Vysial, which is not provided with a test signal generating circuit, RF matching with a television has been adjusted using a tape reproduction signal output through an RF modulator.

However, installing a slide switch for test signal selection to adjust the RF matching between the Vishal and the television brings about an increase in the cost of the product, and the method of generating the test signal using the remote controller is very complicated, There was an inconvenience disadvantage.

Particularly, in the case where the test signal generating circuit is not provided and the RF matching between the vial and the television is adjusted by using the tape playback signal, the image displayed on the television screen during the adjustment is the playback signal of the tape or is selected by the vial tuner The distinction between the error broadcast signals is difficult, which may lead to RF adjustment failure.

It is an object of the present invention to provide a Vessel test signal output method using an on-screen method to facilitate RF matching between Vishal and a television in relation to RF signal transmission.

Figure 1 is a circuit diagram of a typical Vishal.

FIG. 2 is a test signal waveform diagram for explaining the present invention. FIG.

FIG. 3 is a view showing a shape of a test bar to be displayed on a TV screen according to the present invention; FIG.

FIG. 4 is a block diagram of a system control circuit inside a vias for execution of the present invention; FIG.

5 is a flowchart for explaining a test signal output process according to the present invention;

DESCRIPTION OF THE REFERENCE NUMERALS

10: Micom 20: Remote control receiver

30: display unit 40: storage unit

50: OSD control unit 60: RF modulator

A feature of the present invention is to recognize a Vishal power on mode to determine whether to execute an RF matching operation with a Vishal and a television, and to determine whether a Vishial power on state is input Generating a test bar signal for outputting the test signal generation mode to the OSD mode, and outputting the test bar signal to the television screen; And transmitting the test bar to the antenna end of the television, and releasing the test bar after RF matching of the VISUAL with the television using the test bar.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described with reference to the accompanying drawings.

FIG. 4 is a block diagram of a system control circuit inside a vias for carrying out the present invention.

A remote control receiving unit 20 for receiving a key signal of a remote controller and transmitting the key signal to the microcomputer 10 is provided around the microcomputer 10 including a central processing unit, an input / output unit, a RAM, and a ROM, An OSD (On Screen Display) control unit 50 for displaying various menu characters and test bars, and a control unit 50 for controlling the OSD control unit 50 An RF modulator 60 for converting an output test bar signal into an RF signal and outputting the RF signal, and a display unit 30 for displaying a current operation mode or a current time of the vial.

The storage unit 40 comprises an EEPROM capable of storing and deleting consecutively inputted data.

When the character data or the test bar data is generated by the character generator under the control of the microcomputer 10, the OSD control unit 50 transmits the character data or the test bar data to the composite video signal through the RF modulator.

The execution process of the present invention based on the Vishal control system having such a hardware configuration will be described in detail with reference to FIG. 5.

In most cases, the RF mapping between VISIAR and television is adjusted once, so there is no need to recalibrate unless there is a device movement or special circumstances.

Therefore, after the user purchases the Vishial or the television, the Vishal connects the television with the RF system and performs at least one RF matching adjustment.

In the present invention, the determination of the time of RF matching adjustment between the vial and the television is determined by whether the vial is a plug or not.

When the power cord of the vial is inserted into the power outlet and the vial power is turned on, the microcomputer 10 recognizes it and determines whether the current vial mode is the regeneration mode.

Here, if the current mode is the playback mode, the video playback signal of the video tape is converted into an RF signal by the RF modulator 50 of the Vishal and is sent to the television, so that RF matching is adjusted while viewing the tape playback image on the television screen , System initialization for RF matching adjustment without outputting a test signal like a separate test bar is terminated here.

On the other hand, if the current mode is the playback mode under the vial power plug-in condition, the microcomputer 10 transmits data for generating the test bar to the OSD control unit 50.

Accordingly, when the OSD control unit 50 generates a test bar by the on-screen display method and transmits the image signal to the RF modulator 60, the RF modulator 60 converts the test bar signal into an RF signal, To the antenna input terminal side of the television.

The RF modulator 60 converts RF signals into RF signals in three channels (frequency band: 60-65 MHz) or four panels (frequency band: 60-65 MHz) when the Vishial is used for domestic sales, (Frequency band: 90-96 MHz) or two channels (frequency band: 96-105 MHz) when the Vishal is a Japanese one, In case of incidence, it is set to be converted into 36 channel frequency.

After adjusting the video channel of the television using a test bar according to the OSD method modulated and output by the RF modulator 60 of Vishal, the RF matching adjustment step of the brassiall and the television is ended by deleting the test bar.

On the other hand, a special key (test bar reset key) is provided on the remote control or on the vial front panel in such a manner as to delete the test bar after adjusting the video channel of the television as the test bar signal by the OSD method The OSD control unit 50 can control the microcomputer 10 to stop the test bar generation signal that has been generated so far.

The test bar generation signal generated by the OSD control unit 50 is supplied to the OSD control unit 50 by the microcomputer 10 when the tape playback video signal is received by the execution of the Vysial playback mode, It is also possible to cause the on-screen test signal to be erased by issuing a control signal for interruption.

As described above, according to the present invention, it is possible to prevent the operation of the slide switch for selecting a test signal or the intentional tape playback operation When the Vishial power cord is inserted into the outlet, the test bar is continuously output until the Vishal user keys the test bar reset key or plays back the tape, so that the operation for the video channel matching of the television becomes easy Effect will appear.

In addition, since it is not necessary to provide a slide switch for selecting test bar signal generation in vias, the present invention can reduce the cost of the product.

Further, the present invention can prevent the RF adjustment failure due to the determination that the television error broadcast signal is mistaken as the tape playback signal in the RF matching adjustment operation.

Claims (2)

And an RF modulator 60 for converting a test bar signal output from the OSD controller 50 into an RF signal and outputting the converted RF signal. The OSD controller 50 may include a microcomputer 10, various menu characters and a test bar, The method comprising: recognizing an initial power-on mode of Vsial to determine whether initialization of RF matching between a Vsial and a television is to be initiated; Generating a test bar signal to disable test signal generation if the playback mode is selected and outputting a test bar signal to a television screen if the playback mode is not the playback mode; Converting the generated test bar signal into an RF signal and transmitting the RF signal to an antenna end of the television; And determining the completion of the matching after the RF matching adjustment between the television and the Vsial using the tweaver and releasing the test bar signal. Wherein the determination of the completion of RF matching between the television and the vial for releasing the test bar signal is determined by any one of a tape playback mode execution and a test bar release key input.