Keystroke sound suppression

A computer-readable medium having computer-executable instructions stored thereon which, when executed by a computer, will cause the computer to:

• execute an acoustic feature analysis component configured to receive an audio signal, to transform the audio signal from a time domain to a frequency domain, and to analyze the transformed audio signal to determine whether there is a likelihood that keystroke noise is present in the audio signal;
• execute a keystroke event detection component configured to determine whether a keyboard event occurred around a time of the keystroke noise in response to the acoustic feature analysis component determining that there is a high likelihood that keystroke noise is present in the audio signal;
• execute a voice activity detection (VAD) component configured to determine whether speech is present in the audio signal in response to the keystroke event detection component determining that a keyboard event occurred around the time of the likely keystroke noise;
• and to
• execute an automatic gain control component configured to suppress the keystroke noise in the audio signal in response to the VAD component determining that speech is not present in the audio signal.

A system for suppressing keystroke noise in an audio signal, the system comprising:

• an acoustic feature analysis component configured to receive an audio signal, to segment the audio signal into a sequence of frames, to transform the audio signal from a time domain to a frequency domain, and to determine whether there is a likelihood that keystroke noise is present in the audio signal by selecting a current frame from the sequence of frames, determining whether the current frame can be predicted well from one or more frames surrounding the current frame, and to conclude that there is a high likelihood that keystroke noise is present in the audio signal if the current frame cannot be predicted well from the frames surrounding the current frame;
• a keystroke event detection component configured asynchronously receive keystroke information from a input device application programming interface (API) and to determine based upon the keystroke information whether a keyboard event occurred around a time of the likely keystroke noise in response to the acoustic feature analysis component determining that there is a likelihood that keystroke noise is present in the audio signal;
• a voice activity detection (VAD) component configured to determine whether speech is present in the audio signal in response to the keystroke event detection component determining that a keyboard event occurred around the time of the keystroke noise;
• and
• an automatic gain control component configured to suppress the keystroke noise in the audio signal in response to the VAD component determining that speech is not present in the audio signal.