Apparatus and method for adaptive background audio gain smoothing

Abstract

An apparatus for providing a sequence of output gains, wherein the sequence of output gains is suitable for attenuating a background signal of an audio signal is provided. The apparatus comprises a signal characteristics provider configured to receive or to determine signal characteristics information on one or more characteristics of the audio signal, wherein the signal characteristics information depends on the background signal, wherein the signal characteristics information comprises a sequence of input gains which depends on the background signal and on a foreground signal of the audio signal. Moreover, the apparatus comprises a gain sequence generator configured to determine the sequence of output gains depending on the sequence of input gains. To determine the sequence of outputs gains, to modify a current gain value of a current gain of the sequence of output gains to a target gain value, the gain sequence generator is configured to determine a plurality of succeeding gains, which succeed the current gain in the sequence of output gains, by gradually changing the current gain value according to a modification rule during a transition period to the target gain value. The modification rule depends on the signal characteristics information; and/or the gain sequence generator is configured to determine the target gain value depending on a further one of the one or more signal characteristics in addition to the sequence of input gains.