Impulsive noise suppression

A system of impulsive noise suppression in an audio signal, comprising:

• a feature determination unit configured to determine an impulsive noise related feature from a current frame of the audio signal;
• a noise detection unit configured to detect an impulsive noise in the current frame based on the impulsive noise related feature;
• and
• a noise suppression unit configured to apply a suppression gain to the current frame in response to detecting the impulsive noise in the current frame so as to suppress the impulsive noise, wherein the feature determination unit is configured to determine a delta power of the current frame by comparing powers in a high frequency range of the current frame and a previous frame of the audio signal, the delta power indicating a shape of the current frame in time domain.

A computer program product of impulsive noise suppression in an audio signal, comprising a computer program tangibly embodied on a non-transitory machine readable medium, the computer program containing program code for performing operations comprising:

• determining an impulsive noise related feature from a current frame of the audio signal;
• detecting an impulsive noise in the current frame based on the impulsive noise related feature;
• and
• in response to detecting the impulsive noise in the current frame, applying a suppression gain to the current frame to suppress the impulsive noise, wherein applying a suppression gain to the current frame in response to detecting the impulsive noise in the current frame comprises:
• in response to detecting the impulsive noise in the current frame, determining the suppression gain based on a predetermined noise power of a previous impulsive noise and a power of the current frame;
• and
• applying the determined suppression gain to the current frame to suppress the impulsive noise.