Abstract: A video conferencing system provides realistic presence of participants in a videoconference by way of standards-based communication. The system includes three large displays, and at least one slave codec and one camera for each display. In addition, there is an extra codec installed which is the master codec. The master codec is able to establish a conference by instructing the slave codecs at its own site and at the other participating sites to set up point-to-point connections with other slave codecs at different participation sites in a pattern providing an optimal feeling of natural communication so that when a user A talk to user B at another site, user B will experience that the user A turns to him.

Abstract: The present invention relates to an audio communication system and method with improved acoustic characteristics. The present invention utilizes the Haas effect to simulate a sound picture that gives a better subjective impression of stereo sound compared to the objective stereo image. It provides a system and a method for presenting the stereo image in an optimal way for an associated echo canceller without compromising with the subjective perception of stereo.

Abstract: A method and system with means for preventing unauthorized monitoring of a local conference room (1) in which a local conferencing system (2) is located comprising generation of a deterministic sound signal (300), and loading the deterministic sound signal on a first loudspeaker (5) connected to, or integrated in the conferencing system (2), detecting the deterministic signal (600) by analyzing a microphone signal picked up by a microphone (4) connected to, or integrated in the conferencing system (2), and transferring the conference system (2) into a security mode (1100), if the deterministic signal is not detected.

Abstract: A system and method for detecting cell phone noise induced in telecommunication equipment, especially in microphones and other unshielded electronic units connected to a communication terminal. A noise detector is configured to execute a so-called “cepstrum” transform of a captured signal exposed to cell phone noise. Due to the characteristics of cell phone radio signals using TDMA, cell phone induced can then easily be detected from the cepstrum transform as peaks at known samples, and noise elimination or attenuation may then be executed on the captured signal when cell phone noise is detected.

Abstract: The present invention relates to an audio communication system and method with improved acoustic characteristics. The present invention utilizes the Haas effect to simulate a sound picture that gives a better subjective impression of stereo sound compared to the objective stereo image. It provides a system and a method for presenting the stereo image in an optimal way for an associated echo canceller without compromising with the subjective perception of stereo.

Abstract: An audio communication system and method with improved acoustic characteristics features a stereo detector that is introduced in the echo canceller of the system. When stereo in far-end audio is detected, converging of the adaptive mono model of the canceller is suspended, and when stereo in far-end audio is not detected, converging of the adaptive stereo model of the canceller is suspended. The system may also be extended with a miscellaneous processing unit configured to attenuate the signal at certain events implying a large stereo echo contribution. A stereo collapsing unit is also introduced on the channels of the far-end audio to remove the stereo image at certain events to further suppress the echo contribution.