Apparatus and method for reducing TDMA noise of portable terminal

摘要

An apparatus and a method for reducing a time division multiple access noise of a portable terminal. The apparatus includes an interface unit to which an earphone is electrically connected, an audio processing unit including a virtual ground for transmitting and receiving an audio signal through the interface unit, a switch unit located electrically between the interface unit and the audio processing unit for electrically connecting a ground terminal of the interface unit with one of a real ground and the virtual ground of the audio processing unit, and a controller for controlling the switch unit to electrically connect the ground terminal of the interface unit with the virtual ground of the audio processing unit when a call function using the earphone is activated, and to electrically connect the ground terminal of the interface unit with the real ground when the call function using the earphone is deactivated.

主权项

1. An apparatus for reducing a Time Division Multiple Access (TDMA) noise of a portable terminal transmitting and receiving a radio frequency signal according to a TDMA scheme, the apparatus comprising:
an interface unit to which an earphone is electrically connected; a radio communication unit configured to transmit an audio signal to another apparatus in a call function and receive an audio signal from the other apparatus in the call function according to the TDMA scheme; an audio processing unit including a virtual ground, the virtual ground used to transmit the audio signal received from the other apparatus in the call function to the earphone and receive an audio signal from the earphone through the interface unit; a first switch unit located electrically between the interface unit and the audio processing unit configured to electrically connect a ground terminal of the interface unit with one of a real ground and the virtual ground of the audio processing unit; and a controller configured to control the first switch unit to:
electrically connect the ground terminal of the interface unit with the virtual ground of the audio processing unit when a call function using the earphone is activated, andelectrically connect the ground terminal of the interface unit with the real ground when the call function using the earphone is deactivated.