Abstract: A device for directing respired air includes a frame having a top portion, a bottom portion opposite the top portion, and at least one shoulder disposed between the top portion and the bottom portion to receive a portion of a headset. The device further includes an attachment mechanism coupled to the frame for releasably securing the frame to the headset. In addition, the device also includes a wall surface downwardly depending from the bottom portion of the frame to form a curved baffle. The curved baffle directs air corresponding to respiration toward the bottom portion of the frame, and thus toward an input interface of the headset when the frame is releasably secured to the headset.

Abstract: A device for monitoring respiration by a user determines whether sound represented by audio data corresponds to an exhalation. For example, the device receives audio data representing sound, determines a frequency spectrum for the audio data (e.g., amplitude distributions of one or more frequencies, etc.), and identifies various frequency bands of interest. Here, the device identifies a first frequency band corresponding to respiration, a second frequency band corresponding to noise, and a third frequency band corresponding to voice harmonics. The device applies a gain to the first frequency band to create an amplified first frequency band, filters or nulls the second frequency band, and inverts the third frequency band to create an inverted third frequency band. The device determines the frequency spectrum corresponds to an exhalation based on a slope value over the amplitude distributions of the amplified first frequency band and the inverted third frequency band.