Abstract:
The present invention discloses an arrangement utilizes a certain microphone assembly for facilitating audio source tracking systems in communication systems. It can be applied to both single and array microphones. The principal idea is to enhance the sound level acoustically in the critical high frequency range, thereby increasing the effective signal-to-noise ratio both for sound pickup and localization algorithms. This is done by enclosing the microphone into a channel or a small cavity (a Helmholtz-resonator), thereby introducing a high-frequency response peak (resonance), fairly broad-band.
Abstract:
In particular, the present invention provides a method and system for conferencing, including the steps of connecting at least two sites to a conference, receiving at least two video signals and two audio signals from the connected sites, consecutively analyzing the audio data from the at least two sites connected in the conference by converting at least a part of the audio data to acoustical features and extracting keywords and speech parameters from the acoustical features using speech recognition, and comparing said extracted keywords to predefined words, then deciding if said extracted predefined keywords are to be considered a call for attention based on said speech parameters, and further, defining an image layout based on said decision, and processing the received video signals to provide a video signal according to the defined image layout, and transmitting the composite video signal to at least one of the at least two connected sites.
Abstract:
The present invention provides a system and a method making an archived conference or presentation searchable after being stored in the archive server. According to the invention, one or more media streams coded according to H.323 or SIP are transmitted to a conversion engine for converting multimedia content into a standard streaming format, which may be a cluster of files, each representing a certain medium (audio, video, data) and/or a structure file that synchronizes and associates the different media together. When the conversion is carried out, the structure file is copied and forwarded to a post-processing server. The post-processing server includes i.a. a speech recognition engine generating a text file of alphanumeric characters representing all recognized words in the audio file. The text file is then entered into the cluster of files associating each identified word to a timing tag in the structure file. After this post-processing, finding key words and associated points of time in the media stream could easily be executed by a conventional search engine.
Abstract:
The present invention discloses a system and method for automatically detecting the presence of a user in a presence application. The presence detection is provided by active detection mechanisms monitoring the localities near the endpoint or terminal connected to the application. The presence information is centrally stored in a presence server collecting the information directly from the respective user terminals. According to preferred embodiments of the present invention, presence is determined i.a. by means of radar detection, infrared light detection, video processing and face detection/recognition.
Abstract:
The present invention relates to an audio communication system and method with improved acoustic characteristics. A stereo detector is introduced in the echo cancellator of the system. When stereo in far-end audio is detected, converging of the adaptive model of the cancellator is suspended. According to alternative embodiments of the invention, the system is extended with a second echo cancellator removing the stereo image of the echo signal, in addition to 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.
Abstract:
The present invention discloses a method and a system for initiating, routing and scheduling conferences. A dial URL is introduced with a prefix unique for calling purposes. When a user activates such an URL in his web browser, a content handler associated with the browser will recognize the type of URL and send a request to a managing tool to determine an available calling route between the user's preferred end-point and the end-point being addressed in the URL with the required resources. The managing tool then schedule the resources and initiate the call between the end-points. The invention allows for a one-click initiation of ad-hoc calls and conferences.
Abstract:
Methods, systems, and mediums for enabling clients to traverse firewall and Network Address Translation (NAT) installations by using probe packets between servers and clients to communication the addresses modified by the NAT.
Abstract:
A system and a method allowing simultaneous exchange of audio, video and/or data information between a plurality of units over a communication network, supported by a central unit, wherein that the central unit is, based on knowledge regarding one or more of the units, adapted to instruct said one or more units to generate multimedia data streams adjusted to fit into certain restrictions to be presented on other units participating in a same session.
Abstract:
The present invention relates generally to conferencing network systems, and more specifically to a method and a device for establishing a route between a first and a second conference network device in a conference network.