Patent ID: 9407378
Filing Date: 2016-08-02
CPC Classification: H04B

Claim Text:
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: