KR20080087563A - Power control apparatus and method for digital multimedia broadcasting receiving unit - Google Patents

Abstract

A power control apparatus and method for a DMB receiver are provided to control the power of a tuner unit, a baseband unit, and an A/V decoder unit separately when the DMB receiver waits for a DMB signal, thereby reducing unnecessary power consumption when the DMB signal is weak. A tuner unit(210) receives a DMB(Digital Multimedia Broadcasting) signal through an antenna(200). A baseband unit(220) modulates the signal of the tuner unit to convert the signal into a data signal. An A/V(Audio/Video) decoder unit(230) receives streaming data from the baseband unit to restore the streaming data into video and audio. A control unit(240) controls the power of the tuner unit, the baseband unit, and the A/V decoder unit separately with GPIO(General Purpose Input/Output Pin) through an A path. The control unit controls the tuner unit to wait for the reception of a signal when the power of the A/V decoder unit and the baseband unit is off through a B path. The control unit controls to receive real-time broadcasting data from the baseband unit through a C path to store the real-time broadcasting data in a storage device when the DMB signal recovers above a reference value. At this moment, the power of the A/V decoder unit is off.

Description

Power control apparatus and method for digital multimedia broadcasting receiving unit

1 is a block diagram of a conventional DMB device power supply control.

Figure 2 is a block diagram of a power control device of the DMB receiver according to a specific embodiment of the present invention.

3 is a flowchart illustrating a power control method according to a DMB signal in a specific embodiment of the present invention.

4 is a flowchart illustrating a power control method for recording DMB according to a specific embodiment of the present invention.

5 is a flowchart illustrating a method of controlling the power of a DMB receiver according to another specific embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

200: antenna 210: tuner

220: base band section 230: A / V decoder section

240: control unit

The present invention relates to a power control apparatus and method for a DMB receiver, and more particularly, to a power control apparatus for a DMB receiver for controlling power of a tuner, a baseband, and an A / V decoder in receiving a DMB signal. It is about a method.

Digital Multimedia Broadcasting (hereinafter referred to as 'DMB') is a new concept of mobile multimedia broadcasting service that combines broadcasting and communication, and is classified into terrestrial DMB and satellite DMB according to transmission method and network configuration.

In addition, it is called next-generation broadcasting service because it can provide sound quality and data service of CD level and can watch multi-channel multimedia broadcasting while moving through mobile phone, PDA and car receiver.

The terrestrial DMB transmits a program to a DMB terminal using a ground frequency, and a broadcast signal is transmitted through a ground base station. On the other hand, the satellite DMB services by using a satellite, and broadcasts the program in the satellite DMB broadcasting center, the satellite sends it to the DMB terminal through radio waves.

In addition, the DMB terminal generally receives a DMB as an additional device to a PDA, a navigation device, a mobile phone, and a laptop, which are generally mobile devices, rather than an independent receiving device. In addition, the DMB device provided in the mobile device is required to increase the use time as the biggest factor among the power consumption factors of the mobile device.

On the other hand, in general, when receiving a DMB signal, the receiver is composed of a tuner, a baseband and an A / V decoder (hereinafter, referred to as an 'A / V decoder'). As shown in Fig. 2, the power supply is integratedly controlled by a CPU (Central Processing Unit, hereinafter referred to as 'CPU').

However, when the conventional CPU controls the power supply integrally, even when the signal is weak, the tuner, the baseband, and the A / V decoder all have a problem of causing power consumption such as a normal reception state.

Accordingly, the present invention has been made to solve the above-described conventional problems, an object of the present invention is to provide a DMB receiver that can control the power of the tuner, the baseband and the A / V decoder, respectively, when receiving the DMB signal. It is to provide a power supply control apparatus and method.

According to an aspect of the present invention for achieving the above object, the present invention provides a tuner unit for receiving a DMB signal through an antenna, a baseband unit for demodulating the signal of the tuner unit and converting the signal into a data signal, and the baseband unit. And an A / V decoder unit for receiving streaming data from the A / V decoder unit to restore video and audio, and a control unit for individually controlling power of the tuner unit, the baseband unit, and the A / V decoder unit.

The controller controls power of the tuner unit, the baseband unit, and the A / V decoder unit according to the level of the received DMB signal.

The control unit turns off the power of the baseband unit and the A / V decoder unit if the DMB signal received from the tuner unit is less than or equal to the reference value in the reproduction mode.

On the other hand, if the DMB signal received from the tuner unit is greater than or equal to the reference value in the recording mode, the controller applies power to the baseband unit to perform recording, and if the DMB signal received from the tuner unit is less than the reference value, the base unit operates. The power of the band unit is cut off to stop the recording, and the standby of the DMB signal and the reference value or more.

The controller may turn on the power of the A / V decoder unit when a user requests to play the recording, and reproduces the data recorded in the storage device or the real-time broadcasting being recorded according to the user's request. Play the data.

In addition, (a) receiving the screen playback, (b) playing the DMB broadcast signal, (c) measuring the level of the DMB signal during the screen playback, (d) the DMB signal is a reference value Or less, the power supply of the baseband unit and the A / V decoder unit, and (e) if the DMB signal is greater than or equal to the reference value, applying the power to the baseband unit and the A / V decoder unit to reproduce the screen. .

On the other hand, step (c) is executed when the time for which the DMB signal is continuously below the reference value is checked and the time is equal to or greater than the set value.

And (A) measuring the level of the DMB signal, (B) starting the recording by turning on the power of the tuner unit and the baseband unit if the DMB signal is equal to or greater than a reference value, and (C) user input (D) turning on the power of the A / V decoder unit if there is the user input, and (E) reproducing the recorded DMB data or the DMB data being recorded according to the user's input. .

In addition, after the measurement of the step (A), if the DMB signal is less than the reference value, only the power of the tuner unit (on), and further comprising repeating the step (A).

On the other hand, (I) reproducing the DMB broadcast signal, (II) measuring the level of the DMB signal being reproduced, and (III) the power supply of the baseband unit and the A / V decoder unit when the DMB signal is below the reference value. And (IV) checking the time when the DMB signal is continuously below the reference value, and (V) executing the recording mode when the time exceeds the setting value 2.

In the recording mode of step (V), (a) measuring the level of the DMB signal, and (b) turning on the tuner unit and the baseband unit from the tuner unit and the baseband if the DMB signal is equal to or greater than a reference value. (on) recording, (c) detecting a user's input, (d) turning on the power of the A / V decoder unit if the user's input is present, and (ㅁ) the user Reproducing the recorded DMB data or the DMB data being recorded according to the input of.

In step (III), the power-off of the baseband unit and the A / V decoder unit is executed when the time for which the DMB signal is continuously below the reference value is larger than the set value.

Meanwhile, the method further includes the step of initializing the time value prior to the screen reproduction.

According to the present invention having the configuration as described above, the present invention has the advantage of reducing unnecessary power consumption by controlling the power of the tuner, the baseband and the A / V decoder of the receiver when waiting to receive the DMB signal.

Hereinafter, with reference to the accompanying drawings a specific embodiment of the power control device and method of the DMB receiver according to the present invention as described above will be described in detail.

2 is a block diagram of a power control unit of a DMB receiver according to a specific embodiment of the present invention.

As shown in FIG. 2, the present invention includes an antenna 200. The antenna 200 is connected to the tuner unit 210 that receives the DMB signal. In this case, the tuner unit 210 selects a channel and selects a corresponding frequency band.

That is, first, the signal is received through the antenna 200, and then the noise of the analog signal is removed and the weak signal is amplified.

The tuner unit 210 is connected to a baseband unit 220 that modulates the received analog signal into a data signal. The baseband unit 220 serves to demodulate and convert the signal into a data signal. In this case, the tuner unit 210 transmits an intermediate frequency to the baseband unit 220.

The reason for this is that the frequency of information in a communication system is a very low baseband frequency that represents the voice, data or image to be sent. In other words, audio, video and data are widely distributed in baseband frequencies from several KHz to MHz.

In addition, the signal of the baseband frequency band as described above is actually transmitted to the carrier frequency for emitting as an electromagnetic wave leaving the antenna to communicate. In addition, a frequency generally used by a communication system means a unique carrier frequency allocated for such a signal transmission.

That is, the baseband frequency is not converted directly when transmitting and receiving at the carrier frequency, the intermediate frequency is configured in the intermediate stage, the user can finally select the required frequency.

In addition, the tuner unit 210 and the base band unit 220 are connected to an I2C (Inter-Integrated Circuit, hereinafter referred to as 'I2C'). At this time, the I2C serves to carry information between devices having two lines. That is, one line is used for data and the other line is used for clock.

On the other hand, the base band unit 220 is connected to the A / V decoder 230 to restore the image and audio. At this time, the A / V decoder 230 plays a role of receiving the streaming data from the baseband unit 220 and restoring it to video and audio. In other words, the digitized signal is restored to video and audio.

The base band unit 220 and the A / V decoder unit 230 are connected to a control interface and a data interface. In other words, it controls and exchanges information.

The A / V decoder 230 is connected to a controller 240 that controls the component. That is, the controller 240 controls the tuner 210, the baseband 220, and the A / V decoder 230. In addition, the A / V decoder 230 is connected to the control unit 240 and a serial peripheral communication device (SPI: Serial Peripheral Interface, hereinafter referred to as 'SPI').

Here, SPI is an interface that allows data to be exchanged between two peripheral devices by serial communication. One of them is the main and the other is the slave. SPI also operates in full duplex, which means that data can be delivered in both directions simultaneously.

The A / V decoder 230 is connected to the controller 240 through a camera interface. In this case, the camera interface transmits the video signal extracted by the A / V decoder 230 to the controller 240. Here, the interface between the modules is preferably diversified according to the use and characteristics.

In addition, as shown in FIG. 2, the control unit 240 supplies power to the tuner unit 210, the baseband unit 220, and the A / V decoder unit 230 through the A path. General Purpose Input / Output Pin, hereinafter referred to as 'GPIO').

The control unit 240 controls the tuner unit 210 when the power of the A / V decoder unit 230 and the baseband unit 220 is turned off through the B path. To be

In this case, when the DMB signal is restored to the reference value or more, the controller 240 controls to receive the real-time broadcast data from the baseband unit 220 through the C path and store the real-time broadcast data in a storage device (not shown). At this time, it is preferable that the power of the A / V decoder 230 is turned off.

Hereinafter, the power control method of the DMB receiver according to a specific embodiment of the present invention will be described in detail with reference to FIGS. 3 to 4 according to an operation procedure.

3 is a flowchart illustrating a power control method according to a DMB signal according to a specific embodiment of the present invention. 4 is a flowchart illustrating a power control method for DMB recording according to a specific embodiment of the present invention.

First, as shown in FIG. 3, a power control method according to a DMB signal of a mobile device will be described.

First, the mobile device initializes the time value (S310). In this case, the time value refers to a cumulative value in which the DMB signal is continuously below the reference value.

In operation S320, a playback screen request is received from the user. In this case, the controller determines whether the DMB signal of the mobile device is less than or equal to the reference value (S330). In this case, the reference value refers to the strength of the DMB signal for the screen playback by the mobile device.

In addition, if the DMB signal is less than or equal to the reference value, the time value is increased (S340).

On the other hand, the control unit 240 determines whether the time value is greater than the set value (S350). In this case, when the time value is greater than or equal to the set value, the controller 240 turns off the power of the A / V decoder 230 and the baseband 220 (S360). At this time, the setting value is to prevent the screen being reproduced from being switched to the reception standby mode due to the momentary reception of the DMB signal, and the baseband unit and It is the value to cut off the power of A / V decoder.

Here, until the DMB signal recovers above the reference value, the control unit 240 preferably maintains the reception standby state by controlling the tuner unit 210.

Next, as shown in Figure 4, when recording the DMB broadcast signal of the mobile device, it will be described with respect to the power control method.

First, it is determined whether the received DMB signal is greater than or equal to the reference value (S410). At this time, if the reference value or more, the baseband unit 220 is turned on by the control unit 240 (on), the mobile device starts recording (S420).

In this case, the recording means that the moving picture experts group (MPEG) 2 transport stream (TS) data is stored by a controller in a storage device (not shown).

In operation S430, it is determined whether there is a user input. Here, the user's input refers to a playback input for the user to watch DMB broadcasting. At this time, if a user input is received, the controller 240 turns on the power of the A / V decoder 230 (S440).

Thereafter, the mobile device plays the screen (S450). At this time, the reproduction of the screen is determined according to the user's input type, and may reproduce the recorded DMB signal or may simultaneously play the currently recorded DMB signal.

Hereinafter, a power control method of the DMB receiver according to another specific embodiment of the present invention will be described in detail with reference to FIG. 5 according to an operation procedure.

5 is a flowchart illustrating a method of controlling the power of a DMB receiver according to another specific embodiment of the present invention.

As shown in FIG. 5, first, the mobile device initializes a time value (S505). In this case, as described above, the time value refers to a cumulative value in which the DMB signal is continuously below the reference value.

Then, a playback screen request is received from the user (S510). In this case, the controller determines whether the DMB signal of the mobile device is less than or equal to the reference value (S515).

If the DMB signal is less than or equal to the reference value, the time value is increased (S520).

On the other hand, it is determined whether the time value is greater than or equal to the set value 1 (S525). In this case, when the time value is greater than or equal to the set value 1, the controller 240 turns off the power of the A / V decoder 230 and the baseband unit 220 (S530).

In operation S535, it is determined whether the time value is greater than or equal to the set value 2. Here, the setting value 1 is a time value for preventing the reception standby mode from being executed due to a temporary failure of the DMB signal, and the setting value 2 is a time value for switching to the reserved recording mode only when the DMB signal is bad for a long time. That is, during reception and reproduction of the DMB broadcast signal, if the reception of the DMB broadcast signal is poor, the reception standby mode is executed if the time when the reception of the DMB broadcast signal is not desired exceeds the setting value 1, and then the setting value 2 If it exceeds, it switches to reserved recording mode.

At this time, if the time value is greater than or equal to the set value 2, it is determined whether the DMB signal is less than or equal to the reference value (S540).

In addition, when the DMB signal is greater than or equal to the reference value, the baseband unit 220 is turned on to start recording (S545). At this time, it is determined whether there is a user input (S550). Here, the user's input refers to a playback input for the user to watch the DMB broadcast, and may play back the recorded DMB signal according to the user's selection, or may simultaneously play back the currently recorded DMB signal.

At this time, if a user input is received, the controller 240 turns on the power of the A / V decoder 230 (S555). In addition, the mobile device receives the screen playback and ends (S560).

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

In the power control apparatus and method of the DMB receiver according to the present invention as described in detail above, the following effects can be expected.

That is, the present invention has an advantage of reducing unnecessary power consumption when the DMB signal is a weak signal by controlling the power of the tuner, the baseband, and the A / V decoder, respectively, when receiving the DMB signal.

In addition, the present invention has the advantage of increasing convenience by increasing the short DMB viewing time of the portable mobile device.

Claims (13)

A tuner unit configured to receive a DMB signal through an antenna; A baseband unit for demodulating the signal of the tuner unit and converting the signal into a data signal; An A / V decoder which receives streaming data from the baseband and restores the video and audio; And And a control unit for controlling power of the tuner unit, the baseband unit, and the A / V decoder unit, respectively. The method of claim 1, The control unit, And controlling the power of the tuner unit, the baseband unit, and the A / V decoder unit according to the level of the received DMB signal. The method of claim 1, The control unit, If the DMB signal received at the tuner section is lower than or equal to the reference value in the playback mode, And a power supply of the baseband unit and the A / V decoder unit. The method of claim 1, The control unit, If the DMB signal received by the tuner in the recording mode is equal to or greater than the reference value, Powering the baseband unit to perform recording; If the DMB signal received from the tuner unit is less than the reference value, the power supply of the baseband unit is cut off, the recording is stopped, and the power control device of the DMB receiving unit, characterized in that waiting for the DMB signal and the reference value or more. The method of claim 4, wherein The control unit, If the user requests to play the recording, The power control device of the DMB receiving unit, characterized in that the power of the A / V decoder unit to turn on, to reproduce the data recorded in the storage device or to play the real-time broadcast data during recording in response to the user's request. (a) receiving a screen playback; (b) reproducing the DMB broadcast signal; (c) measuring the level of the DMB signal during the screen reproduction; (d) disconnecting power from a baseband unit and an A / V decoder unit if the DMB signal is less than or equal to a reference value; And and (e) reproducing the screen by applying power to the baseband unit and the A / V decoder unit if the DMB signal is greater than or equal to the reference value. The method of claim 6, In step (c), And continuously checking the time when the DMB signal is less than or equal to a reference value, and executing when the time is greater than or equal to a set value. In recording DMB broadcasts, (A) measuring the level of the DMB signal; (B) starting the recording by turning on the power of the tuner unit and the baseband unit if the DMB signal is equal to or greater than a reference value; (C) detecting a user input; (D) turning on the power of the A / V decoder unit if the user input is present; And (E) Power control method of the DMB receiver, characterized in that for playing back the recorded DMB data or the DMB data being recorded according to the user input. The method of claim 8, After the measurement of step (A), If the DMB signal is less than the reference value, only the power of the tuner unit (on), and further comprising repeating the step (A), the power control method of the DMB receiver. (I) reproducing a DMB broadcast signal; (II) measuring the level of the DMB signal being reproduced; (III) if the DMB signal is equal to or less than a reference value, shutting off power of the baseband unit and the A / V decoder unit; (IV) checking a time when the DMB signal is continuously below a reference value; And And (V) executing the recording mode when the time exceeds the setting value 2. The method of claim 10, The recording mode of the (V) step, (A) measuring the level of the DMB signal; (B) turning on and recording the power of the tuner unit and the baseband unit from the tuner unit and the baseband when the DMB signal is equal to or greater than a reference value; (C) detecting a user's input; (D) turning on an A / V decoder unit when there is an input of the user; And (W) The power control method of the DMB receiver, characterized in that the playback of the recorded DMB data or the DMB data being recorded according to the user input. The method of claim 10, In the step (III), The power cut-off of the baseband unit and the A / V decoder unit is performed when the time for which the DMB signal is continuously below the reference value is greater than a set value. The method of claim 10, And a step of initializing a time value prior to the screen reproduction.

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