AUDIO ENCODERS, AUDIO DECODERS, SYSTEMS, METHODS AND COMPUTER PROGRAMS USING AN INCREASED TEMPORAL RESOLUTION IN TEMPORAL PROXIMITY OF ONSETS OR OFFSETS OF FRICATIVES OR AFFRICATES

摘要

An audio encoder for providing an encoded audio information on the basis of an input audio information has a bandwidth extension information provider configured to provide bandwidth extension information using a variable temporal resolution and a detector configured to detect an onset of a fricative or affricate. The audio encoder is configured to adjust a temporal resolution used by the bandwidth extension information provider such that bandwidth extension information is provided with an increased temporal resolution at least for a predetermined period of time before a time at which an onset of a fricative or affricate is detected and for a predetermined period of time following the time at which the onset of the fricative or affricate is detected. Alternatively or in addition, the bandwidth extension information is provided with an increased temporal resolution in response to a detection of an offset of a fricative or affricate. Audio encoders and methods use a corresponding concept.

主权项

1. An audio encoder for providing an encoded audio information on the basis of an input audio information, the audio encoder comprising:
a bandwidth extension information provider configured to provide bandwidth extension information using a variable temporal resolution; a detector configured to detect an onset of a fricative or affricate; wherein the audio encoder is configured to adjust a temporal resolution used by the bandwidth extension information provider such that bandwidth extension information is provided with an increased temporal resolution at least for a predetermined period of time before a time at which an onset of a fricative or affricate is detected and for a predetermined period of time following the time at which the onset of the fricative or affricate is detected; wherein the bandwidth extension information provider is configured to provide the bandwidth extension information such that the bandwidth extension information is associated with temporally regular time intervals of equal temporal lengths, wherein the bandwidth extension information provider is configured to provide a single set of bandwidth extension information for a time interval of a given temporal length if a first temporal resolution is used, and wherein the bandwidth extension information provider is configured to provide a plurality of sets of bandwidth extension information associated with time sub-intervals for a time interval of the given temporal length if a second temporal resolution is used; wherein the audio encoder is configured to adjust a temporal resolution used by the bandwidth extension information provider such that at least one time sub-interval, to which a set of bandwidth extension information is associated, immediately precedes another time sub-interval, to which another set of bandwidth extension information is associated and during which another time sub-interval an onset of a fricative or affricate is detected, such that the increased temporal resolution is used in at least one time sub-interval preceding the time sub-interval in which an onset of a fricative or affricate is detected.