Electronic apparatus and controlling method thereof

An electronic apparatus comprising:

• a memory configured to store at least one instruction;
• and
• at least one processor connected to the memory to control the electronic apparatus,
• wherein the at least one processor is configured, individually and/or collectively, to control the electronic apparatus, by executing the at least one instruction, to:
• obtain a first audio signal including a voice signal and a noise signal;
• convert the first audio signal in a time domain to a second audio signal in a frequency domain;
• obtain a first gain value representing a Signal-to-Noise Ratio (SNR) from the second audio signal;
• obtain a second gain value with a first dynamic range by filtering the first gain value;
• obtain a third gain value by inputting the second gain value to a neural network model trained to output a signal from which noise is removed;
• and
• convert the second audio signal to a third audio signal from which at least a portion of the noise signal is removed, using the third gain value.