Adaptive voice mode extension for a voice activity detector

A voice activity detector (VAD) for indicating an active voice mode and an inactive voice mode, said VAD comprising:

• an input configured to receive an input signal having a plurality of frames;
• and
• an output configured to indicate said active voice mode or said inactive voice mode;
• wherein said VAD is configured to determine whether each of said plurality of frames includes an active voice signal or an inactive voice signal;
• wherein said VAD is configured to reset an inactive voice counter and increments an active voice counter for each of said plurality of frames that said VAD determines to include said active voice signal;
• wherein said VAD is configured to reset said active voice counter and increments said inactive voice counter for each of said plurality of frames that said VAD determines to include said inactive voice signal;
• wherein said VAD is configured to set a voice flag if said active voice counter exceeds a first threshold value;
• wherein said VAD is configured to reset said voice flag if said inactive voice counter exceeds a second threshold value;
• wherein said VAD is configured to detect a first transition from said inactive voice signal to said active voice signal;
• wherein said VAD is configured to indicate said active voice mode in response to said detecting said first transition;
• wherein said VAD is configured to detect a second transition from said active voice signal to said inactive voice signal following said first transition;
• wherein said VAD is configured to continue to indicate said active voice mode for a first period of time after said detecting said second transition if said voice flag is set and for a second period of time after said detecting said second transition if said voice flag is reset, wherein said first period of time is longer than said second period of time;
• and
• wherein said VAD is configured to indicate said inactive voice mode after said continuing.

A voice activity detection method for indicating an active voice mode and an inactive voice mode, said method comprising:

• receiving a first portion of an input signal;
• determining that said first portion of said input signal includes an active voice signal;
• indicating said active voice mode in response to said determining that said first portion of said input signal includes said active voice signal;
• receiving a second portion of said input signal immediately following said first portion of said input signal;
• determining that said second portion of said input signal includes an inactive voice signal;
• extending said indicating said active voice mode for a period of time after said determining that said second portion of said input signal includes said inactive voice signal, wherein said period of time varies based on one or more conditions;
• and
• indicating said inactive voice mode after expiration of said period of time.

A voice activity detector (VAD) for indicating an active voice mode and an inactive voice mode, said VAD comprising:

• an input configured to receive a first portion of an input signal;
• and
• an output configured to indicate said active voice mode or said inactive voice mode;
• wherein said VAD is configured to determine that said first portion of said input signal includes an active voice signal;
• wherein said VAD is configured to indicate said active voice mode in response to determining that said first portion of said input signal includes said active voice signal;
• wherein said input is configured to receive a second portion of said input signal immediately following said first portion of said input signal;
• wherein said VAD is configured to determine that said second portion of said input signal includes an inactive voice signal;
• wherein said VAD is configured to extend indicating said active voice mode for a period of time after said determining that said second portion of said input signal includes said inactive voice signal, wherein said period of time varies based on one or more conditions;
• and
• wherein said VAD is configured to indicate said inactive voice mode after expiration of said period of time.