Systems and Methods for Detecting Subvocalization

A method of processing subvocalized speech of a user, the method comprising:

• receiving a first motion signal from a first motion sensor configured to detect motion of a jaw or a temporomandibular joint (TMJ) of the user;
• receiving a second motion signal from a second motion sensor configured to detect motion of a jaw or a temporomandibular joint (TMJ) of the user, the second motion sensor spaced apart from the first motion sensor;
• determining asymmetric motion of the jaw based on a differential signal derived from the first and second motion signals;
• and
• determining subvocalised speech of the user based on the determined asymmetric motion.

A wearable device for processing subvocalized speech of a user, the personal device comprising:

• an input transducer to generate an audio signal capturing speech of the user;
• a first motion sensor configured to generate a first motion signal capturing motion of a jaw or a temporomandibular joint (TMJ) of the user;
• processing circuitry configured to:
• determine the presence of audible speech in the audio signal;
• when audible speech is present in the audio signal:
• correlate the audible speech with first motion data in the first motion signal to generate mapping data mapping the first motion data to the audible speech;
• when audible speech is not present in the audio signal:
• determine subvocalised speech of the user based on the first motion data and the mapping data.