Abstract: Techniques of calibrating microphones and loudspeakers in a telepresence system includes generating calibration filters for microphones and/or speakers by deriving power spectral densities at each microphone from each loudspeaker. For example, a computer within an improved telepresence system can measure a raw impulse response function corresponding to each channel, i.e., each loudspeaker/microphone pair. The computer then extracts a sub-segment of each impulse response function between a start and finish time. The computer then generates a white-noise power spectral density for each channel based on the sub-segments. The calibration function for a microphone is then based on a reciprocal of the power spectral density averaged over the loudspeakers. The calibration function for a loudspeaker is then based on a reciprocal of the power spectral density averaged over the microphones.

Abstract: Techniques of delivering audio in a telepresence system include specifying a frequency threshold below which crosstalk cancellation (CC) is used and above which VBAP is used. In some implementations, such a frequency threshold is between 1000 Hz and 2000 Hz. Moreover, in some implementations, the improved techniques include modifying VBAP for more than three loudspeakers by forming an over-determined system to determine the amplitude weights for all loudspeakers at once.

Abstract: An immersive hearing loss and auditory prostheses simulator allows a person who listens through the simulation system to experience an actual shift in his or her thresholds for detecting ambient sounds, in a way that is similar to the shift in thresholds experienced by a hearing-impaired person. The simulator shifts the listener's thresholds while also processing the input signals for suprathreshold stimulation. With a controlled degree of auditory threshold shift with loudness recruitment, a hearing loss simulator is made valid and flexible.

Abstract: A hear-through hearing protective device includes at least two microphones, simulated-pinna filters, and a processing circuit. Elevation dependent directional cues are introduced by the processing performed by the simulated-pinna filters. Introduced directional cues are designed to allow the wearer to identify the source location of an acoustic signal.