Apparatus for processing an audio signal and method thereof

An apparatus for processing an audio signal, comprising:

• a power estimating part computing a long-term power and a short-term power by estimating power of a signal;
• a slow gain generating part generating a slow gain based on the long-term power;
• a fast gain generating part generating a fast gain based on the short-term power;
• a final gain obtaining part obtaining a final gain by combining the slow gain and the fast gain;
• and,
• an output signal generating part modifying the signal using the final gain.

A computer-readable medium having instructions stored thereon, which, when executed by a processor, causes the processor to perform operations, comprising:

• receiving a signal, by an audio processing apparatus;
• computing a long-term power and a short-term power by estimating power of the signal;
• generating a slow gain based on the long-term power;
• generating a fast gain based on the short-term power;
• obtaining a final gain by combining the slow gain and the fast gain;
• and,
• modifying the signal using the final gain.