A speech conversion system, comprising: a head-mounted display device (36; 200) operatively connected to a computing device, the head-mounted display device comprising: a display system including a transparent display; an eye-tracking system for tracking a gaze of a user's eye; a microphone array including a plurality of microphones rigidly mounted to the head-mounted display device for receiving audio inputs; and one or more image sensors for capturing image data; a face detection program executed by a processor of the computing device, the face detection program configured to detect from the image data one or more possible faces; a user focus program executed by the processor of the computing device, the user focus program configured to use eye-tracking data from the eye-tracking system to determine a target face on which the user is focused; and a speech conversion program executed by the processor of the computing device, the speech conversion program configured to: use a beamforming technique applied to at least a portion of the audio inputs from the microphone array to identify target audio inputs for speech to text conversion that are associated with the target face; convert the target audio inputs into text (40"); determine if the text is related to the environment; and if the text is related to the environment, display the text via the transparent display of the head-mounted display device as geo-located within the environment for a predetermined period of time. a head-mounted display device (36; 200) operatively connected to a computing device, the head-mounted display device comprising: a display system including a transparent display; an eye-tracking system for tracking a gaze of a user's eye; a microphone array including a plurality of microphones rigidly mounted to the head-mounted display device for receiving audio inputs; and one or more image sensors for capturing image data; a display system including a transparent display; an eye-tracking system for tracking a gaze of a user's eye; a microphone array including a plurality of microphones rigidly mounted to the head-mounted display device for receiving audio inputs; and one or more image sensors for capturing image data; a face detection program executed by a processor of the computing device, the face detection program configured to detect from the image data one or more possible faces; a user focus program executed by the processor of the computing device, the user focus program configured to use eye-tracking data from the eye-tracking system to determine a target face on which the user is focused; and a speech conversion program executed by the processor of the computing device, the speech conversion program configured to: use a beamforming technique applied to at least a portion of the audio inputs from the microphone array to identify target audio inputs for speech to text conversion that are associated with the target face; convert the target audio inputs into text (40"); determine if the text is related to the environment; and if the text is related to the environment, display the text via the transparent display of the head-mounted display device as geo-located within the environment for a predetermined period of time. use a beamforming technique applied to at least a portion of the audio inputs from the microphone array to identify target audio inputs for speech to text conversion that are associated with the target face; convert the target audio inputs into text (40"); determine if the text is related to the environment; and if the text is related to the environment, display the text via the transparent display of the head-mounted display device as geo-located within the environment for a predetermined period of time.