KR20010001084A - Method and apparatus for controlling power source of the digital TV - Google Patents

Abstract

PURPOSE: A power supply control device and a method of digital TV are provided to previously sense the receive timing of update informations to selectively supply power in accordance with the timing. CONSTITUTION: A power supply control device of digital TV comprises a power input part(201), a stand-by power supply(202), a micom(203), first/second switching parts(205,206), a digital signal processor(212), a video/audio signal processor(208) and a speaker(210). The micom(203) outputs control signals by key signals input from outside. The switching part(205) applies the power from the input part(201) to a main power supply(207) in accordance with the control signals from the micom. The switching part(206) applies the power from the input part(201) to a digital power supply in accordance with the control signals from the micom.

Description

Digital TV power control device and method {Method and apparatus for controlling power source of the digital TV}

The present invention relates to a TV, and more particularly, to a power supply control apparatus and method for a digital TV.

A digital TV is a device that receives a digital broadcast signal transmitted from a broadcasting station and provides video and audio to viewers. Most current digital broadcasts follow the MPEG standard. Especially, MPEG-2, which is a broadcast MPEG standard, has a system, audio, and video standard. For reference, the MPEG-2 system standard number is ISO / IEC 13818-1, the video standard number is ISDO / IEC 13818-2, and the audio standard number is ISO / IEC 13818-3.

In digital TV, service information refers to various additional information including broadcasting channel information. Service information is composed of various tables, and each table has various descriptors as a means of transmitting information.

As described above, the descriptors that can be used for each table make it easy to transmit various additional information, and are allocated from 0x80 to 0xFE as a tag for user definition so that additional descriptors can be sent later.

The structure and operation principle of a general digital TV receiver according to the MPEG-2 scheme as described above will be described with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating a general digital TV, and FIG. 2 is a diagram illustrating a digital signal processor shown in FIG. 1 in detail.

As shown in FIG. 2, a general digital TV includes an input unit 10 for supplying commercial power, and first to third power source units 20 and 70 receiving commercial power output through the input unit 10. 90, a user interface 30 receiving the power output from the first power supply unit 20 and outputting a control signal by a key signal applied from the outside, and a control signal of the user interface 30. Accordingly, the switching unit 60 determines whether power supplied from the input unit 10 can be applied to the second power unit 70, and the third power unit 90 according to a control signal of the user interface 30. A digital signal processor 100 for processing a signal received from an antenna by receiving power from the antenna; and a video and audio signal processor 80 for signal processing such that a video signal output from the digital signal processor 100 can be displayed. Wow, The display unit 81 displays an image signal output from the digital signal processing unit 100 and a speaker 82 outputs an audio signal output from the image and audio signal processing unit 80.

The third power supply unit 90 supplies power to the digital signal processing unit 100. The power supply information is updated in the digital signal processing unit 100 even in a standby state (a state in which the main power is cut off or not watching TV). Supply power to process.

Representative update information includes smart card management message and program download code necessary for receiving pay TV. Since the smart card management message may be sent for each subscriber, this signal must be processed when the subscriber's message is sent from the broadcasting station.

As shown in FIG. 2, the digital signal processor 100 tunes an antenna 101, a signal received from the antenna 101, and in-phase signal I of a quadrature phase shift keying (QPSK) signal. A tuner 111 for outputting a quadrature phase signal Q, an analog / digital (A / D) converter 112 for receiving an analog signal tuned by the tuner 111 and converting it into a digital signal, and the A / A link 113 for demodulating and error-correcting the digital QPSK signal converted from the D converter 112 to output a transport stream, and receiving the transport stream from the link 113, a video signal sequence, an audio signal sequence, and an additional information signal sequence. A microcomputer 122 for dividing and outputting the video signal; an MPEG audio / video decoder 132 for receiving a video signal sequence from the microcomputer 122 and decoding the video signal; and a video signal decoded by the MPEG audio / video decoder 132. Take input Video encoder 133 for encoding NTSC signal and digital / analog (D / A) converter 134 for receiving the decoded digital voice signal from the MPEG audio / video decoder 132 and converting it into an analog voice signal. do.

Here, the parts not described are the smart card reader 141, the modem 142, the flash memory 123, the DRAM 124, and the SDRAM 131.

The smart card reader 141 transmits a command to the inserted smart card, enables the microcomputer 122 to recognize the contents stored in the smart card, and enables the user to view the encrypted broadcast when paying broadcast is received. Do it.

Therefore, the smart card (not shown) has pay-TV viewing information, and a message (EMM) information for updating the contents of the smart card is sent from the broadcasting station, and this message is sent for each subscriber so that it is known when its own will be sent. Can't.

The flash memory 123 is used to update a program, to serve as a cache memory of a browser, or to receive an e-mail.

The additional information received through the modem 142 is converted into a TV video signal through a data conversion process and then output to the screen through the display unit 5.

A brief description of the operation of a general satellite broadcasting receiver configured as described above is as follows.

First, the satellite broadcasting signal of the 11 to 12 kHz frequency band received by the antenna 101 is converted into a local oscillation frequency of the LNB (not shown), converted into a 950 to 2150 MHz frequency band signal, and input to the receiver.

Here, the microcomputer 122 transmits a repeater selection value having a different value for each repeater to a phase locked loop (PLL) (not shown) inside the tuner 111 so that the repeater corresponding to the channel to be tuned by the user is fixed. Switch to the intermediate frequency (497.5MHz).

The in-phase signal I and quadrature phase signal Q of the quadrature phase shift keying (QPSK) signal output from the tuner 111 are output, and the A / D converter 112 and the link 113 are the QPSK. Demodulate the signal and correct the error to output the transport stream.

The microcomputer 122 receives the time multiplexed transport stream and performs demultiplexing, where demultiplexing refers to a PID number and splits it into a video signal sequence, an audio signal sequence, and an additional information signal sequence.

The video signal sequence and the audio signal sequence are input to the MPEG video / audio decoder 132, and the additional information signal sequence is further converted into information to be displayed by the GUI through a section filter.

The MPEG video / audio decoder 132 extends the compressed video signal sequence and the audio signal sequence, and the video encoder 133 encodes the extended digital image signal into an NTSC signal and displays the luminance on a general TV or monitor. The signal Y and the color signal C are output, and the D / A converter 134 converts the extended digital voice signal into an analog voice signal.

As described above, in order to update the contents of the smart card for each subscriber, the broadcasting station receives message information for updating the contents of the smart card, and since the message is sent for each subscriber, it is not known when its own will be sent and misses the update information. In order not to do so, the digital signal processor must continue to operate in the standby power state.

Since the digital TV according to the prior art cannot predict when the update information will be sent, there is a problem in that standby power of 30 W or more is consumed because the digital signal processor must operate even in the standby state.

The present invention has been made to solve the above problems, to provide a digital TV power supply control device and method to detect the update information receiving time in advance to selectively supply power according to the update information receiving time. There is this.

1 is a block diagram showing a general digital TV

FIG. 2 is a detailed view of the digital signal processor shown in FIG.

Figure 3 is a block diagram showing a power control device for digital TV according to the present invention

4 is a flowchart illustrating a method of selecting additional information for update of a digital TV according to the present invention.

5 is a flow chart showing a power control method of the digital TV according to the present invention.

Explanation of symbols for main parts of the drawings

200: input unit 201: standby power unit

202: standby power unit 203: microcomputer

204: key input unit 205: first switching unit

206: second switching unit 207: main power supply

208: video and audio signal processing unit 209: display unit

210: speaker 211: digital power supply

212: digital signal processing unit

The present invention is characterized in that key input means for selecting additional information that a user wants to update in a digital TV, control means for receiving broadcast schedule information from a broadcasting station and setting an update time, and at the update time set by the control means. And digital signal processing means for receiving the data for updating the additional information and processing the signal upon arrival, and switching means for supplying operating power to the digital signal processing means according to the output of the control means.

In another aspect, the present invention provides a method for controlling a digital TV power supply having a control means and a digital signal processing means, the method comprising: selecting additional information that a user wants to update, receiving broadcast schedule information from a broadcasting station, Setting an update time of the additional information with reference to the received broadcast schedule information; and receiving data for updating the additional information by supplying power to the digital signal processing means when the set update time is reached. And updating the additional information previously stored in the control means by signal processing the received data, and shutting off the power supply of the digital signal processing means when updating of the additional information is completed. .

Hereinafter, a power control apparatus and method for a digital TV according to the present invention will be described with reference to the accompanying drawings.

3 is a block diagram showing a power supply control apparatus for a digital TV according to the present invention.

As shown in FIG. 3, the digital TV according to the present invention includes an input unit 201 for supplying commercial power, a standby power unit 202, and a main power unit 207 receiving commercial power output through the input unit 201. And the micro power supply unit 211, the microcomputer 203 receiving the power output from the standby power supply unit 202 and outputting a control signal by a key signal applied from the outside, and the control of the microcomputer 203. The first switching unit 205 adjusts the power supplied from the input unit 201 to the main power unit 207 according to the signal, and the input unit 201 according to the control signal of the microcomputer 203. The second switching unit 206 for controlling the power to be applied to the digital power supply unit 211 and the microcomputer 203 receiving the update information received from the outside by receiving power from the digital power supply unit 211. Additional information previously stored in A digital signal processor 212 for signal processing to update the digital signal processor 212, a video signal output from the digital signal processor 212 is displayed, and a video and audio signal processor 208 for processing the audio signal to be outputted; The display unit 209 displays an image signal output from the image and audio signal processing unit 208, and a speaker 210 outputs an audio signal output from the image and audio signal processing unit 208.

In this case, the additional information received from the outside to the digital signal processor 212 is transmitted in a format as shown in the following table.

syntax No. Identifier standby_power_control_descriptor () { descriptor_tag 8 uimsbf descriptor_length 8 uimsbf for (i = 0; i <N; i ++) { subscriber_address 32 uimsbf service_type 8 uimsbf start_time 20 uimsbf max_duration 20 uimsbf } }

The subscriber_address indicates the address of the subscriber, and each receiver may have its own individual subscriber address, where the subscriber address is recorded in a smart card (not shown).

Therefore, since each receiver has its own unique address, the receiver can receive descriptors individually. The subscriber_address is composed of 32 bits. The 16 bits are used to designate a group. The bit can be designated as '0' and the group number to the upper 16 bits.

The service-type indicates a type of information to be updated, and the types of information include EMM, DNL, MSG, and RPT.

The start-time indicates a time at which information update starts, and can receive a corresponding update service supplied with power to the digital signal processor at a start-time time, which is used as time setting information of a timer to be described later. .

The max-duration represents a maximum time that may be required to update the information. The max-duration is used to determine when to turn off the power again after supplying power to the digital signal processor to receive the update service in the standby mode.

As described above, the digital TV according to the present invention receives the descriptor as described above when the user wants to receive the update information selected by the user, and determines whether it is sent to the receiver of the subscriber. Is received, the timer is set by reading the start time information and the related information is stored.

The timer (not shown) is a function built in the microcomputer 203. The timer is driven under the control of the microcomputer 203 when the standby power is supplied. If the digital signal processor 212 needs to set the timer, the timer is controlled. The timer is requested to the microcomputer 203 through the bus.

Then, the microcomputer 203 outputs a control signal to the second switching unit 206 to supply power to the digital signal processing unit 212 when the time set for the timer is reached, and the second switching unit 206 According to the control signal of the microcomputer 203, the device is in the off state in the standby mode and is switched to the on state when the update information reception time is reached.

The driving method of the power control device of the digital TV configured as described above is as follows.

4 is a flowchart illustrating a method of selecting an update information menu of a digital TV according to the present invention, and FIG. 5 is a flowchart illustrating a power control method of the digital TV according to the present invention.

Referring to Figure 4, first, it is determined whether or not the update information menu selection mode (S1).

As a result of the determination (S1), in the update information menu selection mode, only the menu selected by the user through the key input means is set, and the menu not selected is ignored (S2).

The power control method at the time of updating the selected update additional information will be described with reference to FIG.

Referring to Figure 5, first, it is determined whether the subscriber itself is the subscriber (S11).

Subsequently, in the determination result (S11), if the subscriber is the subscriber, it is determined whether the broadcast schedule information of the update additional information is received (S12).

As a result of the determination (S12), when the broadcast schedule information of the update additional information is received, a timer is set to meet the update time, and the broadcast schedule information is stored (S13).

In operation S14, it is determined whether the timer driving is completed and the update time has been reached.

As a result of the determination (S14), when the update time is reached, power is supplied to the digital signal processing unit to receive the additional information for update and update the stored additional information (S15).

Next, it is determined whether the update is completed (S16).

As a result of the determination (S16), if the update is completed, the power supply to the digital signal processing unit is cut off (S17).

As described above, among the various types of update service types (EMM, DNL, MSG, RPT), the user sets in advance which update service the user receives, and broadcast schedule information on the update service to be received while receiving a broadcast signal is provided. When received, it is determined whether or not it is sent to the receiver of the subscriber, and sets a timer corresponding to the transmission start signal and the transmission time.

Then, the microcomputer supplies power to the digital signal processor when the timer reaches the set time, and when the information indicating that the update service is completed is input to the microcomputer, the microcomputer recognizes this and supplies the power of the digital signal processor when the current power state is standby. To block.

The apparatus and method for controlling power supply of a digital TV according to the present invention has an effect of minimizing power consumption and standby power consumption by determining a reception time of additional information to be updated and adjusting a power supply.

Claims (5)

In digital TV, Key input means for selecting additional information that the user wants to update; Control means for receiving broadcast schedule information from a broadcasting station and setting an update time; Digital signal processing means for receiving data for updating the additional information when the update time set by the control means is received and processing the received additional information; And, And a switching means for supplying operating power to the digital signal processing means in accordance with the output of the control means. The method of claim 1, The broadcast schedule information is a digital TV power control device, characterized in that the information consisting of the address, service type, update time, time required. The method of claim 1, And the data for updating the additional information is data included in a user defined area. In the digital TV power supply control method comprising a control means and a digital signal processing means, Selecting additional information that the user wants to update; Receiving broadcast schedule information from a broadcast station; Setting an update time of additional information with reference to the received broadcast schedule information; Receiving power for updating the additional information by supplying power to the digital signal processor when the set update time is reached; Signal processing the received data to update additional information previously stored in the control means; And, And shutting off the power supply of the digital signal processing unit when the update of the additional information is completed. The method of claim 4, wherein The step of cutting off the power supply of the digital signal processing unit is a power control method for a digital TV, characterized in that the step performed in the standby power mode.