A device for generating an ambience signal suitable for being emitted via loudspeakers (Ls, Rs) for which there is no suitable loudspeaker signal, comprising: a transient detector for detecting a transient in a block of an examination signal to obtain a transient period comprising the block of the examination signal; a synthesis signal generator for generating a synthesis signal for the transient period, the synthesis signal generator being implemented to generate a synthesis signal which comprises flatter a temporal course than the examination signal in the transient period and the intensity of which deviates from an intensity of a portion of the examination signal preceding the transient period or subsequent to the transient period by less than a predetermined threshold; and a signal substituter for substituting the examination signal in the transient period by the synthesis signal to obtain the ambience signal, wherein the transient detector is implemented to calculate weighted high-frequency contents for the block of the examination signal, wherein the weighted high-frequency contents are a weighted sum of absolute values of all frequency lines in the block with increasing weighting factors from lower to higher frequencies; wherein the transient detector is implemented to compare the weighted high-frequency contents of the block to a floating average value over weighted high-frequency contents of a plurality of preceding or subsequent blocks of the block without any transients, wherein the transient detector is implemented to detect a transient for the block when the weighted high-frequency contents of the block exceed the floating average value by more than a threshold (c), wherein the synthesis signal generator is implemented to calculate, when generating the synthesis signal for every spectral value of a short-term spectrum of a plurality of blocks, which form the portion of the examination signal preceding the transient period or subsequent to the transient period, an average value using corresponding spectral values of the plurality of blocks to obtain an average value spectrum for the block, to calculate, for spectral values of the average value spectrum for the block, deviations differing for the spectral values of the average value spectrum for the block and being smaller than a maximum deviation (Δ max), and to add the deviations and the average value spectral values to obtain the spectral values for the block, and to convert (43, 76) the spectral values for the block into a temporal representation that represents the synthesis signal. a transient detector for detecting a transient in a block of an examination signal to obtain a transient period comprising the block of the examination signal; a synthesis signal generator for generating a synthesis signal for the transient period, the synthesis signal generator being implemented to generate a synthesis signal which comprises flatter a temporal course than the examination signal in the transient period and the intensity of which deviates from an intensity of a portion of the examination signal preceding the transient period or subsequent to the transient period by less than a predetermined threshold; and a signal substituter for substituting the examination signal in the transient period by the synthesis signal to obtain the ambience signal,