Signal processing apparatus, signal processing method, and program

A non-transitory computer-readable storage medium having stored thereon, a set of computer-executable instructions for causing a computer to perform steps comprising:

• converting an audio signal into absolute values;
• calculating representative values of consecutive sample values included in blocks of the audio signal, wherein the audio signal has been converted into the absolute values using at least a maximum sample value among the sample values included in the blocks;
• determining a section comprising a predetermined number of consecutive blocks as a frame and calculating a maximum value of the representative values of the consecutive blocks included in the frame and an average value of the representative values of the consecutive blocks included in the frame;
• detecting click noise in the frame based on a ratio of the maximum value of the representative values to the average value of the representative values;
• and outputting the audio signal from which the detected click noise is removed.

A signal processing method comprising:

• converting an audio signal into absolute values;
• calculating representative values of consecutive sample values included in blocks of the audio signal, wherein the audio signal has been converted into the absolute values using at least a maximum sample value among the sample values included in the blocks;
• determining a section comprising a predetermined number of consecutive blocks as a frame and calculate a maximum value of the representative values of the consecutive blocks included in the frame and an average value of the representative values of the consecutive blocks included in the frame,
• wherein the maximum sample value among the sample values included in the blocks corresponds to the representative values for individual blocks;
• detecting click noise in the frame based on a ratio of the maximum value of the representative values to the average value of the representative values, wherein the click noise in a frame to be processed is detected using the maximum value of the representative values and the average value of the representative values of the frame to be processed and maximum values of the representative values and average values of the representative values of other frames located in the vicinity of the frame to be processed;
• and
• outputting the audio signal from which the detected click noise is removed.