Abstract: A system and method for location positioning with steganographic encoded data streams in audible-frequency range audio is disclosed. The method comprises encoding, modulating and audio-hiding data streams into corresponding audible-frequency range steganographic audio signal; transmitting each audio signal by a corresponding loudspeaker, wherein each data stream includes the geographic location of the corresponding loudspeaker, a time stamp of transmission of periodic frames of the data stream and the like.

Abstract: The present disclosure relates to a circuit and method for cancelling the acoustic feedback in public address systems, sound reinforcement systems, hearing aids, teleconference systems or hands-free communication systems, comprising providing a filter for tracking the acoustic feedback path between the radiator device broadcasting and the receiver device, the input of said filter being the signal applied to the radiator device; updating the filter for tracking the acoustic feedback path based on time-domain information contained in the cepstrum of the receiver device signal, or updating the filter for tracking the acoustic feedback path based on time-domain information contained in the cepstrum of the signal applied to the radiator device, or updating the filter for tracking the acoustic feedback path based on time-domain information contained in the cepstrum of the difference between the receiver device signal and the signal applied to the radiator device filtered by the filter.

Abstract: The present invention concerns an orientation, navigation and information system, especially adapted for blind or visually impaired people. It is essentially a system that allows blind or visually impaired people to access information usually made available only to public transportation users visually, through posters or informative signs, or through dynamic information screens of various nature.