Parametric audio encoder for generating an encoding parameter for an audio channel signal (X 1 [b]) of a plurality of audio channel signals (X 1 [b], X 2 [b]) of a multi-channel audio signal, each audio channel signal (X 1 [b], X 2 [b]) having audio channel signal values (X 1 [k], X 2 [k]), the encoding parameter being an inter-channel coherence parameter, the parametric audio encoder comprising a parameter generator, the parameter generator being configured - to determine for the audio channel signal (X 1 [b]) of the plurality of audio channel signals a first set of encoding parameters (IPD[b]) from the audio channel signal values (X 1 [k]) of the audio channel signal (X 1 [b]) and reference audio signal values (X 2 [k]) of a reference audio signal (X 2 [b]), wherein the reference audio signal is another audio channel signal (X 2 [b]) of the plurality of audio channel signals or a downmix audio signal derived from at least two audio channel signals of the plurality of multi-channel audio signals, wherein the first set of encoding parameters (IPD[b]) are inter-channel phase difference parameters or sub-band inter-channel phase difference parameters, - to determine for the audio channel signal (X 1 [b]) a first encoding parameter average (IPD mean [i]) based on the first set of encoding parameters (IPD[b]) of the audio channel signal (X 1 [b]), the first encoding parameter average refers to a current frame of the audio channel signal, wherein the parameter generator is configured to determine the first encoding parameter average (IPD mean [i]) of the audio channel signal (X 1 [b]) as an average of the first set of encoding parameters (IPD[b]) of the audio channel signal (X 1 [b]) over frequency bins [k] or frequency sub-bands [b], - to determine for the audio channel signal (X 1 [b]) a second encoding parameter average (IPD mean_long_term) based on the first encoding parameter average (IPD mean [i]) of the audio channel signal (X 1 [b]) and at least one other first encoding parameter average (IPD mean [i-1]) of the audio channel signal (X 1 [b]), the at least one other first encoding parameter average refers to a previous frame of the audio channel signal, and - to determine the encoding parameter based on the first encoding parameter - average (IPD mean [i]) of the audio channel signal (X 1 [b]) and the second encoding parameter average (IPD mean_long_term) of the audio channel signal (X 1 [b]); wherein the parameter generator is further configured - to determine an absolute value (IPD dist) of a difference between the second encoding parameter average (IPD mean_long_term) and the first encoding parameter average (IPD mean [i]), and - to determine the encoding parameter as a function of the determined absolute value (IPD dist). - to determine for the audio channel signal (X 1 [b]) of the plurality of audio channel signals a first set of encoding parameters (IPD[b]) from the audio channel signal values (X 1 [k]) of the audio channel signal (X 1 [b]) and reference audio signal values (X 2 [k]) of a reference audio signal (X 2 [b]), wherein the reference audio signal is another audio channel signal (X 2 [b]) of the plurality of audio channel signals or a downmix audio signal derived from at least two audio channel signals of the plurality of multi-channel audio signals, wherein the first set of encoding parameters (IPD[b]) are inter-channel phase difference parameters or sub-band inter-channel phase difference parameters, - to determine for the audio channel signal (X 1 [b]) a first encoding parameter average (IPD mean [i]) based on the first set of encoding parameters (IPD[b]) of the audio channel signal (X 1 [b]), the first encoding parameter average refers to a current frame of the audio channel signal, wherein the parameter generator is configured to determine the first encoding parameter average (IPD mean [i]) of the audio channel signal (X 1 [b]) as an average of the first set of encoding parameters (IPD[b]) of the audio channel signal (X 1 [b]) over frequency bins [k] or frequency sub-bands [b], - to determine for the audio channel signal (X 1 [b]) a second encoding parameter average (IPD mean_long_term) based on the first encoding parameter average (IPD mean [i]) of the audio channel signal (X 1 [b]) and at least one other first encoding parameter average (IPD mean [i-1]) of the audio channel signal (X 1 [b]), the at least one other first encoding parameter average refers to a previous frame of the audio channel signal, and - to determine the encoding parameter based on the first encoding parameter - average (IPD mean [i]) of the audio channel signal (X 1 [b]) and the second encoding parameter average (IPD mean_long_term) of the audio channel signal (X 1 [b]); - to determine an absolute value (IPD dist) of a difference between the second encoding parameter average (IPD mean_long_term) and the first encoding parameter average (IPD mean [i]), and - to determine the encoding parameter as a function of the determined absolute value (IPD dist).