Method for enhancing quality of audio data, and device using the same

An audio data processing device comprising:

• an audio data pre-processor configured to obtain a spectrum of mixed audio data including noise;
• an encoder and a decoder configured to input 2D input data corresponding to the spectrum to a convolutional network including a downsampling process and an upsampling process to obtain output data of the convolutional network;
• and
• an audio data post-processor configured to generate a mask for removing noise included in the audio data based on the obtained output data, and to remove noise from the mixed audio data using the generated mask,
• wherein, in the convolutional network which is a U-NET convolutional network, the downsampling process and the upsampling process are performed only on a frequency axis of the 2D input data, and remaining processes other than the downsampling process and the upsampling process are performed on the frequency axis and a time axis, and
• wherein the encoder and the decoder performs a causal convolution on the 2D input data on the time axis, and
• wherein the causal convolution performs zero padding on data of a preset size corresponding to the past relative to the time axis in the 2D input data.