• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a cable box on / off control method using a synchronization signal of a V-C. When a scheduled recording of the cable TV signal is performed, the tuner of the V-Cal is tuned to a set channel to detect the synchronization signal and the synchronization signal is not detected. Recognize that the cable box is in the power-off state, tune the V-Cal tuner to the reserved recording channel to detect the synchronization signal again. If the synchronization signal is detected, the cable box is recognized as the power-off state. Since the cable box is recognized as being powered on, it is possible to accurately determine the power on / off state of the cable box, thereby effectively performing the cable TV reservation recording function.
    公开号:KR19990046845A
    申请号:KR1019970064984
    申请日:1997-12-01
    公开日:1999-07-05
    发明作者:류우태
    申请人:전주범；대우전자 주식회사；
    IPC主号:
    专利说明:

    Cable Box On / Off Control Method Using Synchronous Signal of V-Cal
    The present invention relates to a cable box on / off control method using a synchronization signal of a V-C. In particular, when the pre-recording of a cable television signal, the V-CAL can accurately determine the power-on state of the cable box. A cable box on / off control method using a synchronization signal.
    In general, cable television (also known as CATV or cable TV) receives broadcast signals at appropriate points, where it is transmitted to the viewing area using cables and distributed to subscribers. As a countermeasure for the astigmatism area, the joint viewing system was adopted, but as the role of the CATV network as a two-way multi-channel link became more important as a broadband distribution system by coaxial cable, a conversational television telephone, a TV with viewers, The maintenance of wide area CATV networks for data communication, etc. is underway.
    In order to watch such cable TV, a cable TV relay station which receives a broadcast signal of each cable TV station and transmits it to a subscriber is required. In addition, among the plurality of channels transmitted from the cable TV relay station, there are pay channels, and these pay channels can be viewed only by paying a certain amount of subscription fee, and in order to prevent non-subscribers from watching pay channel broadcasts, broadcast signals of pay channels Is scrambled and sent out, and a cable TV converter is installed in front of a television or V-Cal to decode the scrambled broadcast signal. Such a cable TV converter is also called a cable box.
    As shown in FIG. 1, the cable box and V-Cal receive a multi-channel radio frequency (RF) signal transmitted through a cable at a cable TV relay station, and receive the selected channel frequency. Cable box 70 for separating the intermediate frequency and then modulating into 3 or 4 channels to output the RF signal, and V-Cell 71 for receiving the RF signal output from the cable box 70 and performing the reserved recording function. And a television 72 which receives an RF signal or a video signal and an audio signal output from the VLC 71 and outputs video and audio through a display screen and a speaker.
    And V-71 is a tuner 73 for receiving the multi-channel RF signal or the RF signal modulated to a predetermined channel to be switched output from the cable box 70 and the tuner 73, and in the tuner 73 An intermediate frequency demodulator 74 for separating the intermediate frequency from the tuned channel RF signal, a modulator 75 for modulating the intermediate frequency separated by the intermediate frequency demodulator 74 into a predetermined channel (3 or 4 channels), A video signal processor 76 for processing the video signal of the intermediate frequency separated by the intermediate frequency demodulator 74 and recording the video signal on a video tape (not shown), and a synchronization signal from the video signal of the video signal processor 76. And a synchronization signal detection circuit 77 for detecting a signal and a synchronization detection signal output from the synchronization signal detection circuit 77 to determine a power on / off state of the cable box 70, and to perform a cable TV signal reservation recording function. Under control Consists of a microcomputer 78, an intermediate-frequency demodulator 74, the intermediate frequency of the audio signal processing unit 79 for recording audio on the voice track of a voice signal by processing the speech signal a video tape (not shown) separate from.
    The cable TV signal reservation recording operation of the conventional cable box and VRC having the above configuration is as follows.
    When the scheduled recording time comes, the microcomputer 78 turns on the V-AL 71 and stores the currently tuned channel data. The reason for storing the currently tuned channel data is that the channel is to be returned after the reserved recording function ends.
    First, if the cable box 70 is powered on, the multi-channel RF signal input to the cable box 70 through the cable is tuned to the currently tuned channel frequency, and the intermediate frequency is separated, and then the preset channel (3 or 4 channels). ) Is input to the tuner 73 of VLC 71. In this case, all the RF signals output when the cable box 70 is in the power-on state are modulated into one of three or four channels, and it is assumed that the preset channel is set to three channels for convenience of description. .
    The RF signal input to the tuner 73 is tuned to three channels and input to the intermediate frequency demodulator 74 to separate the intermediate frequency. The video signal of the intermediate frequency separated by the intermediate frequency demodulator 74 is input to the video signal processor 76 to be processed. At this time, the synchronization signal detection circuit 77 detects the synchronization signal and inputs a 'high' signal to the microcomputer 78 when the synchronization signal is detected. Then, the microcomputer 78 determines that the cable box 70 is in a power-on state.
    The microcomputer 76 inputs channel data to be reserved and recorded in the cable box 70 to tune to the reserved recording channel, and outputs a recording control signal to the VLC 71 deck. Then, the cable box 70 tunes the RF signal to the reserved recording channel frequency, separates the intermediate frequency, and modulates the RF signal to the three channel frequency to output it. The microcomputer 78 of the VLC 71 outputs channel data to the tuner 73 to tune and tune three channels, and the RF signal tuned to the three channels is intermediate frequency separated by the intermediate frequency demodulator 74. The video signal of the intermediate frequency is processed by the video signal processing unit 76 to be recorded on the video tape (not shown), and the audio signal of the intermediate frequency is processed by the audio signal processing unit 79 into the audio signal and not recorded on the video tape (not shown). Is recorded in the voice track.
    On the other hand, if the cable box 70 is in the power-off state, the multi-channel RF signal input through the cable is switched and transmitted directly to the tuner 73 of the V-Cal 71. At this time, since the tuner 73 is tuned to three channels and the cable box 70 is powered off, there is no RF signal in the three channels. Therefore, since the intermediate signal separated by the intermediate frequency demodulator 74 does not contain a video signal, the synchronization signal detection circuit 77 does not detect the synchronization signal, and the microcomputer 78 inputs a 'low' signal. Then, the microcomputer 78 determines that the cable box 70 is powered off, outputs a power control signal to the cable box 70 to power on the cable box 70, and inputs channel data to be reserved and reserved. The recording channel is tuned, and a recording control signal is output to the VLC 71 deck.
    Then, the cable box 70 tunes the RF signal to the reserved recording channel frequency, separates the intermediate frequency, and modulates the RF signal to the three channel frequency to output it. The microcomputer 78 of the VLC 71 outputs channel data to the tuner 73 to tune and tune three channels, and the RF signal tuned to the three channels is intermediate frequency separated by the intermediate frequency demodulator 74. The video signal of the intermediate frequency is processed by the video signal processing unit 76 to be recorded on the video tape (not shown), and the audio signal of the intermediate frequency is processed by the audio signal processing unit 79 into the audio signal and not recorded on the video tape (not shown). Is recorded in the voice track.
    However, when pre-recording the cable TV signal, V-CAL needs to know the power box on / off state of the cable box. There is no problem when the cable box is powered on, but the cable box is powered off and received through the cable. If there are broadcast signals on three channels of the RF signal, a synchronization signal is detected. Therefore, the VRC microcomputer has determined that the cable box is in a power-on state and performs the scheduled recording function, thereby causing the failure of performing the reserved recording function.
    The present invention has been invented to solve the above problems, and when the scheduled recording of the cable TV signal, tune the tuner of V-Cal to the set channel and determine whether the synchronization signal is detected. Recognizes the power-off state, tunes the tuner to the reserved recording channel, detects the synchronization signal and detects the synchronization signal again, and recognizes that the cable box is in the power-off state.If the synchronization signal is not detected, the cable box is powered. Since it recognizes that it is in the on-state, it provides a cable box on / off control method using V-Cal's synchronization signal, which can accurately identify the power-on / off state of the cable box so that the cable TV reservation recording function can be successfully performed. The purpose is.
    In order to achieve the above object, the present invention provides a channel data memory step for storing the tuning channel data of the current V-C before a predetermined time from the time of the reservation-recording when performing the cable TV signal reservation recording function in the V-C. After performing the data memory step, tune the tuner of V-AL to the set channel and determine whether the synchronization signal is detected. If the synchronization signal is not detected, the synchronization signal detection determination step of recognizing that the cable box is in the power-off state and the synchronization signal detection If it is determined in the determination step that the synchronization signal is detected, the reserved recording channel tuning step of tuning the reserved recording channel by outputting the reserved recording channel data to the tuner, and determining whether the synchronization signal is detected after performing the reserved recording channel tuning step is performed. Cable box is powered on if is not detected Recognizes Taein However, when the synchronizing signal is detected characterized in that a cable box is made of a cable box power on / off determination step of recognizing that the power-off state.
    1 is a block diagram of a conventional cable box and VRC.
    Figure 2 is a block diagram of the cable box and V-C to which the present invention is applied.
    3 is a flowchart of the present invention.
    <Explanation of symbols for main parts of drawing>
    10: cable box 11: modulator
    12: cable TV tuner 13: medium frequency demodulator
    14: cable box micom 15: remote control receiver
    30: VR 31: Modulator
    32: Tuner 33: Intermediate Frequency Demodulator
    34: video signal processor 35: audio signal processor
    36: input signal selection switch 37: synchronization signal detection circuit
    38: microcomputer 39: control signal light emitting unit
    40: remote control 41: remote control receiver
    50: television
    Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
    As shown in FIG. 2, a cable box and a V-C to which the present invention is applied, receive a RF signal transmitted through a cable at a cable TV relay station and switch or transmit an RF signal or output a video signal and an audio signal. (10), the V-CAL 30 which receives the RF signal or the video signal and the audio signal output from the cable box 10 and performs the reserved recording function, and the RF signal or the RF signal output from the V-Cal 30 or It consists of a television (50) that receives video and audio signals and outputs video and audio through the display screen and speakers.
    In addition, the cable box 10 includes a modulator 11 for switching and transmitting a multi-channel RF signal input through a cable or modulating a predetermined channel (3 or 4 channels), and the RF transmitted from the modulator 11. A cable TV tuner 12 that receives the signal and tunes it to the selected channel, an intermediate frequency demodulator 13 that separates the intermediate frequency from the RF signal of the channel tuned by the cable TV tuner 12, and the intermediate frequency demodulator ( 13) and a cable box microcomputer 14 for controlling the entire cable box, and a remote control receiver 15 for receiving and inputting an infrared signal of a remote controller (not shown) by the cable box microcomputer 14.
    In addition, the VAL 30 receives the multi-channel RF signal or the RF signal modulated into a predetermined channel that is switched by the modulator 11 of the cable box 10 and transmits the multi-channel RF signal by switching or transmitting a predetermined channel ( A modulator 31 for modulating to 3 or 4 channels), a tuner 32 that receives the switching transmitted RF signal from the modulator 31 and tunes to the selected channel, and an RF of the channel tuned by the tuner 32. The video signal by selectively switching the intermediate frequency demodulator 33 for separating the intermediate frequency from the signal, the signal demodulated by the intermediate frequency demodulator 33 or the signal output from the intermediate frequency demodulator 13 of the cable box 10. An input signal selection switch 36 input to the processing unit 34 and the audio signal processing unit 35, and a synchronization signal detection circuit 37 for detecting a synchronization signal from the video signal of the video signal processing unit 34; To the synchronization signal detecting circuit 37 A microcomputer 38 for controlling the cable TV signal reservation recording function by determining the power on / off state of the cable box 10 by receiving the synchronization detection signal outputted from the controller and outputting the cable box control signal; Control signal light emitting unit 39 for modulating the cable box control signal of the control panel in the form of infrared rays to be emitted to the remote control receiver 15 of the cable box 10, and receiving and demodulating the infrared signal of the remote controller 40 with the microcomputer 38. It consists of a remote control receiver 41 to input.
    The cable box on / off control method using the synchronization signal of the present invention VRC applied to the cable box and the VCA made as described above is shown in FIG. 3.
    First, proceeding to the reservation recording preparation time determination step (S2) in the initial state (S1) is connected to the cable box that receives the cable TV signal through the cable and the V-C is received by receiving the RF signal input from the cable box and scheduled recording. It is determined whether or not a predetermined time before the scheduled recording time. If it is determined in the reserved recording preparation time determining step (S2) that it is not a certain time ago from the reservation recording time, but it is determined that it is a certain time ago from the reservation recording time, the process proceeds to the channel data memory step (S3) and the tuning channel of the current VR is present. Memory the data.
    That is, while the cable box 10 that receives the cable TV signal through the cable and the V-CAL 30 that receives the RF signal input from the cable box 10 and reserve recording are connected, the microcomputer 37 reserves the reservation. It is determined whether or not a certain time ago from the recording time. Here, the predetermined time is a time required for preparation of reservation recording before reservation recording.
    If it is determined by the microcomputer 37 that the current time is a predetermined time from the reservation recording time, the microcomputer 37 turns on the V-Cal 30 and stores channel data tuned by the current tuner 32. The reason for storing the currently tuned channel data is that the channel is to be returned after the reserved recording function ends.
    Then, the process proceeds to the synchronization signal detection determination step S4 to determine whether the synchronization signal is detected. When it is determined that the synchronization signal is detected in the synchronization signal detection determination step S4, the process proceeds to the reservation recording channel tuning step S5 to output the reservation recording channel data to the VRC tuner to tune the reservation recording channel. Then, the process proceeds to the cable box power on / off determination step S6 to determine whether a synchronization signal is detected. If it is determined that the synchronization signal is detected in the cable box power on / off determination step S6, the process proceeds to the power control signal output step S7 to power on the cable box.
    That is, when the cable box 10 is powered on, the multi-channel RF signal input to the cable TV tuner 12 through the cable and the modulator 11 of the cable box 10 is tuned to the currently tuned channel frequency, The intermediate frequency is separated by the frequency demodulator 13 and then modulated to a preset channel (3 or 4 channels) and input to the tuner 32 of the VCAL 30. Here, all the RF signals output when the cable box 10 is in the power-on state are modulated to one of three or four channels, and it is assumed that the preset channel is set to three channels for convenience of description. .
    Then, the RF signal input to the tuner 32 is tuned to three channels and input to the intermediate frequency demodulator 33 to separate the intermediate frequency. The video signal of the intermediate frequency separated by the intermediate frequency demodulator 33 is input to the video signal processor 34 and processed. At this time, the synchronization signal detecting circuit 37 detects the synchronization signal and inputs a 'high' signal to the microcomputer 38.
    The microcomputer 38 transmits and tunes the cable TV channel data to be reserved and recorded to the tuner 32. Then, the RF signal output from the cable box 10 is input to the modulator 31 of the VCC (30). The RF signal input to the modulator 31 is tuned to the reserved recording channel by the tuner 32, and the video signal of the intermediate frequency separated from the intermediate frequency by the intermediate frequency demodulator 33 is input to the video signal processor 34 to receive the video signal. Is processed. The synchronizing signal detecting circuit 37 inputs a 'high' signal to the microcomputer 38 when the synchronizing signal is detected by the image signal processing unit 34, and inputs a 'low' signal to the microcomputer 38 when the synchronizing signal is not detected. do.
    The microcomputer 38 determines that the cable box 10 is in the power-off state when the 'high' signal is input from the synchronization signal detecting circuit 37, and outputs the power control signal through the control signal light emitting unit 39. The remote control receiving unit 15 of 10 receives and demodulates an infrared power control signal and inputs it to the cable box microcomputer 14. Then, the cable box microcomputer 14 outputs a control signal to a power control unit (not shown) of the cable box 10 to power on the cable box.
    On the other hand, if it is determined that the synchronization signal is not detected in the synchronization signal detection determination step S4, the process proceeds to the power control signal output step S7 to power on the cable box.
    That is, when the cable box 10 is in the power-off state and no broadcast signal is present in the set channel, no synchronization signal is detected, and thus a 'low' signal is input from the synchronization signal detection circuit 37 to the microcomputer 38. ) Determines that the cable box 10 is in the power-off state and outputs a power control signal through the control signal emitting unit 39, the remote control receiver 15 of the cable box 10 receives the power control signal in the infrared form. It demodulates and inputs into the cable box microcomputer 14. Then, the cable box microcomputer 14 outputs a control signal to a power control unit (not shown) of the cable box 10 to power on the cable box.
    On the other hand, it is determined that the synchronization signal is not detected in the cable box power on / off determination step S6, or after performing the power control signal output step S7, the process proceeds to the cable box reserved recording channel tuning step S9. The reserved recording channel is tuned by outputting the reserved recording channel data to the cable box. Then, the process proceeds to the reservation recording time determination step (S10) to determine whether the reservation recording time has been reached. If it is determined in the reservation recording time determination step (S10) that the reservation recording time has not been determined, the process returns to the reservation recording time determination step (S10) and determines whether the reservation recording time is again, but if it is determined that the reservation recording time has been reached, the reservation recording step (S11). Proceed to) to reserve and terminate the cable TV signal.
    That is, if the cable box 10 is in the power-on state, all RF signals are modulated and output to three channels. If the tuner 32 of the V-CAL 30 is tuned to the cable TV channel to be reserved, the broadcast is made to the reserved recording channel. The signal does not exist. Therefore, since the synchronization signal is not detected in the synchronization signal detecting circuit 37, the 'low' signal is input to the microcomputer 38, and the microcomputer 38 determines that the cable box 10 is in the power-on state.
    Then, when the microcomputer 38 outputs the reserved recording channel data through the control signal emitting unit 39, the remote control receiver 15 of the cable box 10 receives and demodulates the infrared recording of the reserved recording channel data, Enter (14). Then, the cable box microcomputer 14 outputs channel data to the cable TV tuner 12 to tune the reserved recording channel.
    Then, the cable box 10 synchronizes the multi-channel RF signal to the reserved recording channel frequency, modulates the intermediate frequency into three channel frequencies, and outputs the modulated signals. In addition, the microcomputer 38 determines whether the reservation recording time has been reached, and when it is determined that the reservation recording time has been reached, the channel data is output to the tuner 32 and tuned by tuning three channels, and the RF signal tuned to the three channels is an intermediate frequency. In the demodulator 33, the intermediate frequency is separated. The video signal of the intermediate frequency is processed by the video signal processor 34 to be recorded on the video tape (not shown), and the audio signal of the intermediate frequency is processed by the audio signal processor 35 to process the audio signal. Is recorded in the voice track.
    In this manner, the cable TV reservation recording function is performed.
    The present invention determines whether a synchronization signal is detected by tuning a tuner of V-Cal to a set channel when pre-recording a cable TV signal as described above, and recognizes that the cable box is in a power-off state when the synchronization signal is not detected. The tuner is tuned to the reserved recording channel to detect the synchronization signal again. If the synchronization signal is detected, the cable box is recognized as the power-off state. If the synchronization signal is not detected, the cable box is recognized as the power-on state. By accurately knowing the power box's power on / off status, the cable TV reservation recording function can be successfully performed.
    权利要求:
    Claims (1)
    [1" claim-type="Currently amended] The channel data memory step of storing the tuning channel data of the current V-Cal at a certain time before the scheduled recording time when the cable TV signal reservation recording function is performed in the VC. To determine whether the synchronization signal is detected and to detect that the cable box is in the power-off state if no synchronization signal is detected, and to the tuner if it is determined that the synchronization signal has been detected in this synchronization signal detection determination step. The cable box is in a power-on state if the synchronization signal is not detected by determining the reservation recording channel tuning step of outputting the reservation recording channel data to tune into the reservation recording channel, and whether the synchronization signal is detected after performing the reservation recording channel tuning step. Recognize the sync signal The cable box power-off state is to be recognized cable box power on / off determination cable using the synchronization signal V CR, characterized in that step consisting of the box on / off control method.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-12-01|Application filed by 전주범, 대우전자 주식회사
    1997-12-01|Priority to KR1019970064984A
    1999-07-05|Publication of KR19990046845A
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019970064984A|KR19990046845A|1997-12-01|1997-12-01|Cable Box On / Off Control Method Using Synchronous Signal of V-Cal|
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