Method and apparatus for detecting accessories in electronic devices

1. An apparatus for detecting an accessory in an electronic device comprising:

an interface unit to connect with the accessory; and

a controller configured to:

detect a connection with the accessory;

generate an analog signal having a predetermined frequency in response to detection of the connection with the accessory wherein the generated analog signal is applied to an identification terminal of the interface unit, wherein a frequency of the analog signal applied to the identification terminal is changed when input to the controller from the identification terminal, if the connected accessory is of a particular type;

convert an analog signal input from the identification terminal to a digital signal, wherein a change in a frequency of the analog signal input from the identification terminal is corresponds to a particular type of the connected accessory; and

identify the type of the connected accessory based on the digital signal.

2. The apparatus of claim 1 , further comprising a memory to store an accessory identification table to associate predetermined accessories with digital signals.

3. The apparatus of claim 2 , wherein the controller is further configured to:

search the accessory identification table to identify whether the digital signal exists in the accessory identification table; and

identify the accessory associated with the digital signal, when the digital signal exists in the accessory identification table.

4. The apparatus of claim 1 , wherein the interface unit is an ear jack and the identification terminal is a microphone terminal.

5. The apparatus of claim 1 , wherein the controller is further configured to use a comparator to detect the connection with the accessory.

6. The apparatus of claim 1 , wherein the controller is further configured to use a display unit to display an icon representing the accessory.

7. The apparatus of claim 1 , wherein the accessory further generates a different analog signal having a different frequency and apply the generated different analog signal to the identification terminal.

8. The apparatus of claim 1 , wherein the accessory comprises a frequency changing element to change the predetermined frequency.

9. A method for detecting an accessory in an electronic device comprising:

detecting a connection of the accessory with an interface unit;

generating an analog signal having a predetermined frequency in response to detection of the connection with the accessory wherein the generated analog signal is applied to an identification terminal of the interface unit, wherein a frequency of the analog signal applied to the identification terminal is changed when output from the identification terminal, if the connected accessory is of a particular type;

converting an analog signal input from the identification terminal to a digital signal, wherein a change in a frequency of the analog signal input from the identification terminal corresponds to a particular type of the connected accessory; and

identifying the type of the connected accessory based on the digital signal.

10. The method of claim 9 , wherein the identifying the type of the accessory comprises searching an accessory identification table that associates predetermined accessories with digital signals to identify whether the digital signal exists in the accessory identification table.

11. The method of claim 9 , wherein the interface unit is an ear jack and the identification terminal is a microphone terminal.

12. The method of claim 9 , wherein detecting the connection of the accessory comprises:

comparing an output voltage of a detection terminal of the interface unit with a preset reference voltage; and

detecting a detection signal output in accordance with a result of comparing the output voltage and the preset reference voltage.

13. The method of claim 9 , further comprising displaying an icon representing the connected accessory.

14. The method of claim 9 , further comprising generating, using a signal generating unit included in the accessory, a different analog signal in a different frequency, and applying the different analog signal generated in the accessory to the identification terminal.

15. The method of claim 9 , further comprising changing, using a frequency changing element included in the accessory, the predetermined frequency.

16. An apparatus for detecting an accessory in an electronic device comprising:

an interface unit to connect with the accessory;

a bias voltage source to apply a bias voltage to an identification terminal of the interface unit; and

a controller configured to:

detect a connection with the accessory;

generate an analog signal having a predetermined frequency and apply the generated analog signal to the identification terminal of the interface unit in response to detection of the connection with the accessory;

convert an analog signal input from the identification terminal to a digital signal; and

identify a type of the connected accessory based on the digital signal,

wherein the accessory comprises one of:

a signal generating unit to generate a different analog signal having a different frequency and apply the generated different analog signal to the identification terminal; and

a frequency changing element to change the predetermined frequency,

wherein a frequency of the analog signal applied to the identification terminal is changed when input to the controller from the identification terminal, if the connected accessory is of a particular type, and the analog signal input from the identification terminal is changed according to the type of the connected accessory in which a change in the predetermined frequency corresponds to a particular type of the connected accessory.

17. The apparatus of claim 1 , further comprising:

an audio processor coupled to the interface unit, the audio processor configured to output audio signals generated in the electronic device,

wherein the audio processor is configured to perform at least one of:

output a sound effect to indicate that the accessory is connected, and

change a path of an output of audio signals when the accessory is connected.

18. The method of claim 9 , further comprising:

outputting, by an audio processor coupled to the interface unit, audio signals generated in the electronic device, and

performing at least one of outputting a sound effect to indicate that the accessory is connected and changing a path of an output of audio signals when the accessory is connected.

19. The apparatus of claim 16 , further comprising:

an audio processor coupled to the interface unit, the audio processor configured to output audio signals generated in the electronic device,

wherein the audio processor is configured to perform at least one of:

output a sound effect to indicate that the accessory is connected, and

change a path of an output of audio signals when the accessory is connected.