KR19990079538A - How to set the clock of a broadcast receiving device - Google Patents

Abstract

According to the present invention, when a broadcast program is received using a broadcast program identification code (KBPS) included in a broadcast signal, the broadcast receiving device switches the operation to the sleep mode to the stop mode and broadcasts when the power is supplied again. The present invention relates to a clock setting method of a broadcast receiving apparatus capable of setting a clock by using clock data of a program identification code, the present invention comprising: checking a state of a power down mode (S21); Checking whether an external interrupt has occurred when the power down mode is low (S22); If an external interrupt has not occurred, switching to a stop mode (S23); When an external interrupt occurs or the power down mode is in a high state, checking the state of the power down port and ending the program in the low state (S24); Inserting a power cord and checking a power-off port to initialize the external interrupt when it is in a high state (S25); After initializing the external interrupt, detecting clock data of the KBPS packet (S26); And updating the clock data corresponding to the detected clock data (S27), and the present invention can automatically execute the clock setting using the KBPS clock data, so that the user does not need to set it manually. Since the oscillator and backup battery do not need to be used is a useful invention that can reduce the material cost.

Description

How to set the clock of a broadcast receiving device

The present invention relates to a clock setting method of a broadcast receiving apparatus. More particularly, the broadcast receiving apparatus operates in a sleep mode when receiving a broadcast program using a broadcast program identification code (KBPS) included in a broadcast signal. The present invention relates to a clock setting method of a broadcast receiving apparatus capable of switching to a stop mode and setting a clock using clock data of a broadcast program identification code when power is supplied again.

1 is a schematic configuration diagram of a broadcast receiving apparatus, in which a broadcast receiving apparatus 2 according to a power cut mode includes an antenna 1 for receiving a broadcast receiving signal; A watch oscillator 4 for supplying a watch oscillation frequency; A backup battery 5 for supplying backup power to the clock oscillator 4 in the power-off mode, and a microcomputer 3 for outputting clock data by the oscillation frequency of the clock oscillator 4.

For example, the timer of the video recording device of the broadcast receiving device plays a role of relaying between the user and the video recording device like the system control, and performs its own function using the microcomputer 3, Take over with the sheath. In other words, if the function button operated is an independent function such as a clock setting, the function button is independently operated. However, if the function button is related to a deck mechanism such as a reservation recording, it transfers the relevant data to the system and takes over.

The timer built in the microcomputer 3 performs a clock function using a display and enables time setting and change. In order to perform the clock function, there is a method of using a power oscillation frequency and a method of using a crystal oscillator of 32.768 ((Crystal). Currently, a method of using a crystal oscillator is mainly used to make a power backup function. do. In addition, the reservation recording function refers to a function of automatically recording by setting a recording start time and a recording end time by using the clock function of the timer, and the power backup function is also referred to as a timer backup. It is a function to compensate the power of timer for a certain time in order to preserve the program of timer microcomputer.

On the other hand, Figure 2 is a flow chart of the clock setting method of the video recording apparatus in the broadcast receiving apparatus according to the prior art, first checks the state of the power off flag to determine whether the power off mode (S11), the power off mode In the case of the low state, the state of the power fail port (Power Fail Port) of FIG. 1 is checked, and when the power-off port is the high state, it switches to the active mode and ends the program (S12).

However, when the state of the power-off port is low, the power-off flag is set to set (S13), and after the power-off mode is high or after setting the power-off flag, the sleep mode (Sleep) Mode) (S14). Here, the sleep mode is a sub active mode, and refers to a mode in which a clock is operated by oscillating a 32.768 GHz crystal oscillator using a minimum backup battery power.

Next, if it is switched to the sleep mode, it is determined whether a 1 second interrupt has occurred (S15), and when the 1 second interrupt occurs, a clock update routine is performed to update clock data (S16), and the 1 second interrupt is generated. If not, or after the clock data is updated, it is determined whether the power-off mode is again, and if the power-off mode is a high state, the process returns to the sleep mode switching step (S17). In this case, when the power cutoff mode S17 is in a low state, the program is terminated while exiting the power cutoff state.

Therefore, the program is repeatedly executed until the power-off port becomes high, that is, until the power cord is inserted, and at this time, an operation such as clock update is performed by using a backup battery having minimal power. . In other words, in the conventional power-off mode, the clock is set using the crystal oscillator of 32.768 하여 with the minimum power in the sleep mode. Here, the 32.768 ㎑ crystal oscillator is an oscillator used for clock reference oscillation, and can perform a clock function, which is one of timer functions.

However, the conventional clock setting method of a broadcast receiving device, for example, a video recording device, has to continuously oscillate a crystal oscillator of 32.768 을 to set the clock, and requires a separate backup battery which must supply minimum power for this. Material costs rise. In addition, there is a problem that the user must set the clock again when the power off mode is released and the power is supplied again.

Therefore, the present invention was created to solve the above problems, and when the power is supplied again by the broadcast receiving apparatus, the clock mode is set using the clock data of the broadcast program identification code. By doing so, it is not necessary to use a crystal oscillator and a backup battery, thereby reducing material costs, and also providing a convenience in that the clock is automatically set so that the user does not need to set the clock again.

1 is a schematic configuration diagram of a broadcast receiving apparatus according to the prior art;

2 is a flowchart illustrating a clock setting method in a power down mode according to the prior art;

3 is a configuration diagram of a general reserved recording apparatus having a KBPS function,

4 illustrates a KBPS broadcast program timetable,

5 illustrates a clock data format among KBPS packet data formats.

6 is a flowchart of an embodiment of a clock setting method in a power down mode according to the present invention.

※ Explanation of code for main part of drawing

10: antenna 20: tuning unit

30: Y / C signal processor 40: signal line selector

50: data detector 60: microcomputer (u-COM)

70: memory 80: recording unit

A first step of determining whether the power off mode according to the present invention for achieving the above object; Switching to a stop mode in a power off mode; And a fourth step of detecting clock data from the received video signal when the power is supplied again, and a fourth step of updating and setting the current time according to the detected clock data.

In the clock setting method of the broadcast receiving apparatus according to the present invention, the code power is switched off to a stop mode, and when the power is supplied again in the code power off state, KBPS operation is performed to detect clock data, By setting the current time of the broadcast receiving apparatus in correspondence with the detected clock data, the crystal oscillator of 32.768 ㎑ and a backup battery are not required.

Hereinafter, the clock setting method of the video recording apparatus to which the preferred embodiment of the clock setting method of the broadcast receiving apparatus according to the present invention is applied will be described in detail with reference to the accompanying drawings.

Referring to FIG. 3, a general video recording apparatus includes a tuner 20 that demodulates and outputs a video signal by tuning a desired broadcast signal among broadcast signals received from an antenna ANT 10; A Y / C signal processing unit 30 for converting the luminance and color signals of the image signal output from the tuning unit 20; A signal line selector 40 for selecting and outputting a designated horizontal line in a vertical retrace section of the demodulated video signal; A data detector (50) for detecting data contained in the signal of the selected horizontal line; A memory 70 for storing broadcast time data detected by the data detector 50; A recording unit (80) for recording the signal converted by the Y / C signal processing unit (30); And a microcomputer 60 that controls the recording of the recording unit 80 according to the viewer's selection of the reserved recording program.

In the reserved recording of the video recording apparatus configured as described above, first, a specific horizontal line of a signal tuned by the tuning unit 20 and output as a video signal is selected by the signal line selector 40, and this horizontal line is selected. The broadcast time data existing at is detected by the data detector 50 and transferred to the microcomputer 60. The microcomputer 60 reconfigures the detected broadcast time data to a predetermined format and stores the data in the memory 70, and the microcomputer 70 may set or change the current time through a built-in timer. 4 illustrates an example of a part of broadcast time information stored in the memory 70. After such broadcasting time information is stored in the memory 70, when the viewer selects a corresponding mode for displaying the broadcasting time information on the screen, the microcomputer 60 displays the broadcasting time table shown in FIG. 4 in the memory 70. Display on the screen. When the viewer selects a program to be reserved by using the Up / Down keys and selects the reserved recording mode, the microcomputer 60 identifies an ID code of the corresponding program stored together in the memory 70. Detect. Subsequently, when the operating power is cut off, the microcomputer 60 controls the tuning unit 20 to tune the reserved channel to demodulate and output the video signal. The demodulated video signal is input to the Y / C signal processor 30 and the signal line selector 40, respectively. The signal line selector 40 selects a specific horizontal line as described above and the data detector ( 50) extracts the broadcast program information contained in the signal of the selected horizontal line and transmits it to the microcomputer 60. The microcomputer 60 compares the on-air ID of the currently broadcast program with the previously detected program identification code among the received broadcast program information, and if the two codes match, the recording unit 80. Control to record the video signal converted by the Y / C signal processing unit 30. When recording is started in the recording unit 80, the microcomputer 60 checks the in-broadcast code that is continuously detected by the data detection unit 50. Control ends the recording.

6 is a flowchart illustrating a method of setting a clock of an image recording apparatus to which an embodiment of the present invention is applied. Hereinafter, the configuration of the image recording apparatus of FIG. 3 will be described in detail.

First, a power off mode may occur during scheduled recording using the video recording apparatus as shown in FIG. 3, and thus the clock data may be lost. When the power off mode is released after a certain time, the clock data must be restored.

Therefore, as shown in FIG. 6, the state of the power-off mode is checked (S21), and when the power-off mode is low, an external interrupt is generated (S22). Next, the external interrupt does not occur. If not, the mode is switched to the stop mode and the program is terminated (S23).

When the external interrupt occurs or when the power down mode is high, the program is terminated when the power down port is checked in the low state (S24). That is, when the power off port is monitored and the power down port drops to the low state, the video recording system is switched to the stop mode. At this time, since no operation is performed, power consumption is not consumed.

Next, when the power cord is inserted and the power-off port is continuously checked and becomes high, the external interrupt is initialized (S25), that is, the microcomputer 60 switches to the active state by applying an external interrupt element. When the microcomputer 60 is revived, clock data of the KBPS packet is detected (S26).

Referring to FIG. 5, clock data of the KBPS packet is received in 33-bit data format for items of year, month, day, hour, minute, and second for the current date / time.

The clock data is updated by performing a clock routine using the detected clock data (S27). That is, when the power-off port returns to the high state by the code power input, the active mode is switched and the current time is immediately updated by referring to the clock data of the KBPS packet. At this time, the clock function is performed from the updated current time through the timer built in the microcomputer 70.

As a result, the present invention switches to the stop mode in the power-off mode, and when there is a power cord input, performs KBPS to detect and set clock data, thereby eliminating the need for using a crystal oscillator and backup battery related to clock setting. will be.

In the clock setting method of the broadcast receiving apparatus according to the present invention, the clock setting method can be automatically executed using KBPS clock data, so that the user does not need to set the clock manually, and also does not use the clock crystal oscillator and the backup battery. It is a useful invention that can bring a material cost reduction effect.

Claims (3)

Determining a power-off mode; Switching to a stop mode in a power off mode; A third step of detecting clock data from a received video signal when power is supplied again; and And a fourth step of updating and setting a current time corresponding to the detected clock data. According to claim 1, The third step further comprises the step of initializing the external interrupt clock setting method of the broadcast receiving device. According to claim 1, The second step is a clock setting method of the broadcast receiving device, characterized in that switching to the stop mode according to whether or not the external interrupt occurs in the power off mode.