Patent ID: 9747888
Date: 2017-08-29
CPC Classifications: G10K,H04L,H04S

Claim:
1. Reverberator for reverberating an audio signal, comprising: a feedback delay loop processor for delaying at least two different frequency subband signals comprising a first frequency subband signal being a first time-frequency tile and a different second frequency subband signal being a second different time-frequency tile, the at least two different frequency subband signals representing the audio signal by different loop delay amounts to acquire at least two reverberated frequency subband signals comprising a first reverberated frequency subband signal corresponding to the first time-frequency tile and a different second reverberated frequency subband signal corresponding to the second time-frequency tile, wherein the feedback delay loop processor comprises: wherein the first delay line and the first combiner are configured as a first sparse filter, and wherein the second delay line and the second combiner are configured as a second sparse filter, wherein the first sparse filter comprises a first filter tap density, wherein a first filter impulse response of the first sparse filter approximates a first predetermined energy envelope, and wherein the second sparse filter comprises a second filter tap density, wherein a second filter impulse response of the second sparse filter approximates a second predetermined energy envelope, wherein the first sparse filter or the second sparse filter comprises a plurality of phase modification units, wherein each phase modification unit of the plurality of phase modification units is directly connected to an individual delay line tap of the plurality of delay line taps, and wherein each phase modification unit is configured to apply a phase operation to a corresponding signal output by the individual delay line tap, the phase operation comprising a phase amount equal to k×π/2, wherein k is an integer number.