Apparatus and method for controlling battery power in a digital multimedia broadcasting terminal

1. An apparatus for controlling battery power in a mobile terminal supporting digital multimedia broadcasting (DMB) service, the apparatus comprising:

first and second radio frequency (RF) signal processors for respectively processing DMB signals and call signals received through associated antennas;

a DMB modem for demodulating DMB signals output from the first RF signal processor; and

a voltage detector for detecting a voltage of the mobile terminal, and disabling the DMB modem if the detected voltage is less than or equal to a threshold.

2. A method for controlling battery power in a terminal including a digital multimedia broadcasting (DMB) modem for receiving DMB signals and a voltage detector connected to the DMB modem, the method comprising the steps of:

detecting, by the voltage detector, a voltage of the terminal and determining if the detected voltage is less than or equal to a threshold; and

disabling the DMB modem if the detected voltage is less than or equal to the threshold.

3. An apparatus for controlling battery power in a mobile terminal supporting digital multimedia broadcasting (DMB) service, the apparatus comprising:

first and second radio frequency (RF) signal processors for respectively processing DMB signals and call signals received through associated antennas;

a DMB modem for demodulating DMB signals output from the first RF signal processor and responding to a power-off command received externally; and

a controller for processing call signals output from the second RF signal processor and providing the power-off command to the DMB modem if battery power is less than or equal to a threshold.

4. The apparatus of claim 3 , wherein the controller periodically checks battery power, measures an average voltage for a predetermined time and generates the power-off command if the average voltage is less than or equal to a threshold.

5. The apparatus of claim 4 , wherein the controller includes an analog-to-digital converter (ADC) for measuring the battery power.

6. The apparatus of claim 4 , wherein upon receiving the power-off command, the DMB modem determines if a level of an initial average voltage for DMB service is less than or equal to a threshold, and if the initial average voltage is less than or equal to the threshold, the DMB modem stores therein parameters used in an initial acquisition frequency table for DMB service and software for the DMB modem, and disables operation thereof.

7. The apparatus of claim 3 , wherein the DMB modem comprises:

a memory for interfacing with the power-off command provided from the controller; and

a power-off controller for disabling the DMB modem in response to the power-off command.

8. A method for controlling battery power in a terminal including a digital multimedia broadcasting (DMB) modem for demodulating DMB signals and a controller for processing call signals, the method comprising the steps of:

measuring, by the controller, an average voltage for a predetermined time;

generating a power-off command and providing the power-off command to the DMB modem if the measured average voltage is less than or equal to a threshold;

storing, by the DMB modem, at least one parameter upon receiving the power-off command; and

disabling operation of the DMB modem after storing the at least one parameter.

9. The method of claim 8 , further comprising the step of providing, by the DMB modem, information indicating a successful power-off to the controller.

10. The method of claim 8 , wherein the at least one parameter comprises state parameters used in an initial acquisition frequency table for DMB service and software for the DMB modem.