Electronic apparatus and controlling method thereof

1. An electronic apparatus comprising:

a microphone;

a communication interface including circuitry; and

at least one processor configured to:

based on identifying that a trigger word is included in a first sound signal received through the microphone, enter a voice recognition mode;

identify a gain value based on a result of comparison between an intensity of the first sound signal and a predetermined intensity range;

adjust an intensity of a second sound signal received through the microphone in the voice recognition mode based on the identified gain value;

obtain a user command based on voice recognition regarding the adjusted second sound signal;

identify whether an external apparatus is in a turned-on state or in a turned-off state through the communication interface;

based on identifying that the external apparatus is in the turned-on state, transmit the user command to the external apparatus; and

based on identifying that the external apparatus is in the turned-off state, transmit a control command for turning on the external apparatus and the user command to the external apparatus.

2. The electronic apparatus as claimed in claim 1 , wherein the at least one processor is configured to:

based on the intensity of the first sound signal being equal to or greater than a first threshold value in a specific frequency band, identify the gain value for decreasing the intensity of the second sound signal to the predetermined intensity; and

based on the intensity of the first sound signal being less than the first threshold value in the specific frequency band, identify the gain value for increasing the intensity of the second sound signal to the predetermined intensity.

3. The electronic apparatus as claimed in claim 1 , wherein the at least one processor is configured to, based on the intensity of the first sound signal exceeding a sound collection band of the microphone for a specific threshold period, identify the gain value for decreasing the intensity of the second sound signal to the predetermined intensity.

4. The electronic apparatus as claimed in claim 1 , wherein the at least one processor is configured to control the communication interface to transmit the second sound signal whose intensity is adjusted to an external server that performs voice recognition, and control the communication interface to transmit the received user command to the external apparatus.

5. The electronic apparatus as claimed in claim 1 , comprising:

a speaker,

wherein the at least one processor is configured to:

based on the identified gain value being a gain value for increasing the intensity of the second sound signal, increase an output volume of the speaker to correspond to the gain value; and

based on the identified gain value being a gain value for decreasing the intensity of the second sound signal, decrease the output volume of the speaker to correspond to the gain value.

6. The electronic apparatus as claimed in claim 1 , comprising:

a storage including the trigger word and storing signal data corresponding to a plurality of signals of different intensities, respectively,

wherein the at least one processor is configured to, based on the first sound signal corresponding to one of the plurality of signal data stored in the storage, enter the voice recognition mode.

7. The electronic apparatus as claimed in claim 6 , wherein the storage is configured to store a noise extraction algorithm for performing noise filtering and echo canceling, and

wherein the at least one processor is configured to, after extracting a noise of the first sound signal using the noise extraction algorithm, identify whether the first sound signal corresponds to one of the plurality of signal data.

8. The electronic apparatus as claimed in claim 1 , wherein the at least one processor is configured to re-adjust the gain value based on a result of comparison between the intensity of the received second sound signal and the predetermined intensity range.

9. The electronic apparatus as claimed in claim 1 , wherein the electronic apparatus is a remote control device for controlling the external apparatus remotely.

10. A controlling method of an electronic apparatus, comprising:

based on identifying that a trigger word is included in a first sound signal received through the microphone, entering a voice recognition mode;

identifying a gain value based on a result of comparison between an intensity of the first sound signal and a predetermined intensity range;

adjusting an intensity of a second sound signal received through the microphone in the voice recognition mode based on the identified gain value;

obtaining a user command based on voice recognition regarding the adjusted second sound signal;

identifying whether an external apparatus is in a turned-on state or in a turned-off state;

based on identifying that the external apparatus is in the turned-on state, transmitting the user command to the external apparatus; and

based on identifying that the external apparatus is in the turned-off state, transmitting a control command for turning on the external apparatus and the user command to the external apparatus.

11. The controlling method as claimed in claim 10 , wherein the identifying a gain value comprises:

based on the intensity of the first sound signal being equal to or greater than a first threshold value in a specific frequency band, identifying the gain value for decreasing the intensity of the second sound signal to the predetermined intensity; and

based on the intensity of the first sound signal being less than the first threshold value in the specific frequency band, identifying the gain value for increasing the intensity of the second sound signal to the predetermined intensity.

12. The controlling method as claimed in claim 10 , wherein the identifying a gain value comprises, based on the intensity of the first sound signal exceeding a sound collection band of the microphone for a specific threshold period, identifying the gain value for decreasing the intensity of the second sound signal to the predetermined intensity.

13. The controlling method as claimed in claim 10 , wherein the transmitting the user command to the external apparatus comprises:

transmitting the second sound signal whose intensity is adjusted to an external server that performs voice recognition; and

transmitting the received user command to the external apparatus.