Abstract: An apparatus for synthesizing a spatially extended sound source includes: a spatial information interface for receiving a spatial range indication indicating a limited spatial range for the spatially extended sound source within a maximum spatial range; a cue information provider for providing one or more cue information items in response to the limited spatial range; and an audio processor for processing an audio signal representing the spatially extended sound source using the one or more cue information items.

Abstract: An apparatus synthesizing a spatially extended sound source, includes: a storage for storing one or more rendering data items for different limited spatial sectors, wherein the different limited spatial sectors are located in a rendering range for a listener, wherein the one or more rendering data items for a limited spatial sector includes at least one of a left variance data item, a right variance data item, and a left-right covariance data item; a sector identification processor for identifying one or more limited spatial sectors for the spatially extended sound source within the rendering range for the listener based on spatially extended sound source data; a target data calculator for calculating target rendering data from the stored left variance data, the stored right variance data, or the stored covariance data; and an audio processor for processing an audio signal representing the spatially extended sound source using the target rendering data.

Abstract: An apparatus for synthesizing a spatially extended sound source (SESS), has: a storage for storing rendering data items for different elementary spatial sectors covering a rendering range for a listener; a sector identification processor for identifying, from the different elementary spatial sectors, a set of elementary spatial sectors belonging to the spatially extended sound source based on listener data and spatially extended sound source data; a target data calculator for calculating target rendering data from the rendering data items for the set of elementary spatial sectors; and an audio processor for processing an audio signal representing the spatially extended sound source using the target rendering data.

Abstract: A decorrelator includes a plurality of delay units, wherein each delay unit is configured for receiving a part of a frequency representation being based on an audio signal, wherein each delay unit is configured for delaying the received part to provide a delayed part. The decorrelator includes an envelope shaper configured for receiving and combining signals being based on the delayed parts of the frequency representation. The envelope shaper receives the frequency representation of the audio signal and is configured for adjusting an energy of the delayed parts in respect of the frequency representation of the audio signal. The envelope shaper is configured for providing a combined shaped frequency representation. Transient signal portions are handled by an adapted operation of the decorrelator.

Abstract: An apparatus for synthesizing a spatially extended sound source includes: a spatial information interface for receiving a spatial range indication indicating a limited spatial range for the spatially extended sound source within a maximum spatial range; a cue information provider for providing one or more cue information items in response to the limited spatial range; and an audio processor for processing an audio signal representing the spatially extended sound source using the one or more cue information items.

Abstract: A technique for reducing acoustic feedback in audio communications includes measuring variations in round-trip delay over an audio signal pathway. The technique varies a delay interval of an adjustable-delay element in real time based on the measured variations in round-trip delay, effectively canceling the delay variations. Further techniques are disclosed for detecting and eliminating howling frequencies which arise as a result of acoustic feedback in the audio signal pathway.

Abstract: A technique for reducing acoustic feedback in audio communications includes measuring variations in round-trip delay over an audio signal pathway. The technique varies a delay interval of an adjustable-delay element in real time based on the measured variations in round-trip delay, effectively canceling the delay variations. Further techniques are disclosed for detecting and eliminating howling frequencies which arise as a result of acoustic feedback in the audio signal pathway.