APPARATUS AND METHOD FOR REDUCING TDMA NOISE IN TERMINAL

• US 20130223430A1
• Filed: 01/17/2013
• Published: 08/29/2013
• Est. Priority Date: 02/24/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Kim, Taegyun, Sagong, Jin, Kim, Jisang, Kim, Sangeun, Sim, Jaeyong, Ahn, Byeongdo
• Granted Patent: US 9,374,155 B2
• Time in Patent Office: Days
• US Class Current: 370/347
• CPC Class Codes: H04B 15/04 the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
• CPC Class Codes: H04B 7/2643 using time-division multiple access [TDMA] H04B7/2615, H04B7/2618 take precedence

Abstract

An apparatus for reducing TDMA noise in a terminal transceiving a wireless signal in a TDMA scheme, includes an interface unit in which an output accessory is mounted, an audio processor including a virtual ground and transceiving an audio signal to and from an output accessory through the interface unit, a switch unit provided between the interface unit and the audio processor and switching such that a ground terminal of the interface unit is connected to one of a real ground or a virtual ground of the audio processor, and a controller controlling the switch unit to connect the ground terminal of the interface unit to the virtual ground when a call function using the output accessory is activated, in which the switch unit is configured by two or more switches which are connected to each other in a parallel connection.

Claims

1. An apparatus for reducing Time Division Multiple Access (TDMA) noise in a terminal transceiving a wireless signal in a TDMA scheme, the apparatus comprising:

an interface unit in which an output accessory is mounted;

an audio processor including a virtual ground, configured to transceive an audio signal to and from the output accessory through the interface unit;

a switch unit provided between the interface unit and the audio processor, configured to switch such that aground terminal of the interface unit is connected to one of a real ground or a virtual ground of the audio processor; and

a controller configured to control the switch unit to connect the ground terminal of the interface unit to the virtual ground when a call function using the output accessory is activated, and

wherein the switch unit is configured by two or more switches which are connected to each other in a parallel connection.

2. The apparatus of claim 1, wherein the controller is configured to control the switch unit to connect the ground terminal of the interface unit to the real ground when the call function using the output accessory is inactivated.

3. The apparatus of claim 1, wherein the switch unit comprises a first switch and a second switch which are connected to each other in parallel, the controller is configured to control the first switch to connect the ground terminal of the interface unit to the virtual ground of the audio processor when the call function using the output accessory is activated, and

the controller is configured to control the second switch to connect the ground terminal of the interface unit to the virtual ground of the audio processor when the call function using the output accessory is activated.

4. The apparatus of claim 1, wherein one terminal of the first switch is connected to the ground terminal of the interface unit and another terminal of the first switch is connected to the virtual ground of the audio processor, and the controller is configured to control the first switch to connect the one terminal to the another terminal.

5. The apparatus of claim 1, wherein one terminal of the second switch is connected to the ground terminal of the interface unit and another terminal of the second switch is connected to the virtual ground of the audio processor, and the controller is configured to control the second switch to connect the one terminal to the another terminal.

6. The apparatus of claim 3, wherein the controller is configured to transmit a first switch control signal to the first switch and the second switch when the call function using the output accessory is activated, and

upon receiving the first switch control signal, the first switch to connect one terminal of a first switch, the one terminal being connected to the ground terminal of the interface unit, to another terminal of the first switch, the another terminal being connected to the virtual ground of the audio processor when the call function using the output accessory is activated.

7. The apparatus of claim 6, wherein

upon receiving the first switch control signal, the second switch connects one terminal of a second switch, the one terminal being connected to the ground terminal of the interface unit, to another terminal of the second switch, the another terminal being connected to the virtual ground of the audio processor when the call function using the output accessory is activated.

8. The apparatus of claim 1, further comprising a radio receiver receiving a radio signal,

wherein the ground terminal of the interface unit is further connected to an antenna terminal of the radio receiver.

9. The apparatus of claim 8, wherein when a radio function is activated using the radio receiver, the controller controls the switch unit to connected the ground terminal of the interface unit to the real ground.

10. The apparatus of claim 9, further comprising a matching unit provided between the interface unit and the radio receiver and performing impedance matching of the radio signal.

11. The apparatus of claim 1, wherein the interface unit includes a 3.5π

connector.

12. A method of reducing Time Division Multiple Access (TDMA) noise in a terminal including a radio frequency communication unit transceiving a wireless signal in a TDMA scheme, an interface unit in which an output accessory is mounted, an audio processor including a virtual ground and transceiving an audio signal to and from the output accessory through the interface unit, and a switch unit provided between the interface unit and the audio processor and switching such that a ground terminal of the interface unit is connected to one of a real ground or a virtual ground of the audio processor, the method comprises:

controlling the switch unit to connect the ground terminal of the interface unit to the virtual ground of the audio processor when a call function using the output accessory is activated,

wherein the switch unit is configured by at least two switches which are connected to each other in parallel.

13. The method of claim 12, further comprising controlling the switch unit to connect the ground terminal of the interface unit to the real ground when the call function using the output accessory is inactivated.

14. The method of claim 12, wherein the switch unit comprises a first switch and a second switch which are connected to each other in parallel, and

the controlling of the switch unit comprises:

controlling the first switch to connect the ground terminal of the interface unit the virtual ground of the audio processor when the call function using the output accessory is activated; and

controlling the second switch to connect the ground terminal of the interface unit to the virtual ground of the audio processor when the call function using the output accessory is activated.

15. The method of claim 14, wherein one terminal of the first switch is connected to the ground terminal of the interface unit and another terminal of the first switch is connected to the virtual ground of the audio processor, and wherein the controller is configured to control the first switch to connect the one terminal to the another terminal.

16. The method of claim 14, wherein one terminal of the second switch is connected to the ground terminal of the interface unit and another terminal of the second switch is connected to the virtual ground of the audio processor, and wherein the controller is configured to control the second switch to connect the one terminal to the another terminal.

17. The method of claim 14, wherein the terminal comprises a controller transmitting a first switch control signal to the first switch and the second switch when the call function using the output accessory is activated, and

upon receiving the first switch control signal, the first switch connects one terminal of the first switch, the one terminal being connected to the ground terminal of the interface unit, to another terminal of the first switch, the another terminal being connected to the virtual ground of the audio processor when the call function using the output accessory is activated.

18. The method of claim 14, wherein the second switch connects one terminal of the second switch, the one terminal being connected to the ground terminal of the interface unit, to another terminal of the second switch, the another terminal being connected to the virtual ground of the audio processor when the call function using the output accessory is activated.

19. The method of claim 12, further comprising:

a radio receiver receiving a radio signal, wherein the ground terminal of the interface unit is further connected to an antenna terminal of the radio receiver.

20. The method of claim 19, further comprising:

controlling the switch unit to connected the ground terminal of the interface unit to the real ground when a radio function is activated using the radio receiver.