Apparatus for processing an audio signal and method thereof

An apparatus for processing an audio signal, comprising:

• a hardware noise detecting part generating a noise estimation based on a signal;
• and,
• a hardware gain filter computing part computing a gain filter for noise canceling, based on the noise estimation and the signal, the hardware gain filter computing part obtaining a restricted gain filter by applying feedback information to the gain filter,
• wherein the feedback information is received from a hardware normalizing part,
• wherein the feedback information is estimated based on a normalizing gain,
• wherein the normalizing gain corresponds to a combination of a slow gain and a fast gain,
• wherein the slow gain corresponds to a gain for controlling a maximum dynamic range of the signal, and
• wherein the fast gain corresponds to a gain for controlling a local dynamic range of the signal.

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

• receiving, by an audio processing apparatus, a signal, and feedback information estimated based on a normalizing gain;
• generating a noise estimation based on the signal;
• computing a gain filter for noise canceling, based on the noise estimation and the signal;
• and,
• generating a restricted gain filter by applying the feedback information to the gain filter
• wherein the normalizing gain corresponds to a combination of a slow gain and a fast gain,
• wherein the slow gain corresponds to a gain for controlling a maximum dynamic range of the signal, and
• wherein the fast gain corresponds to a gain for controlling a local dynamic range of the signal.