Hearing apparatus having an adaptive filter and method for filtering an audio signal

A hearing apparatus, comprising:

• a first stage transformation unit disposed to receive a signal and configured to split the signal through transformation onto a plurality of channels;
• at least two second stage transformation units each configured to split the signal of one of the plurality of channels through transformation onto sub-channels of the one channel;
• a filter unit in each of the plurality of channels having a second stage transformation unit,
• said filter unit being configured to filter the signal of the respective channel depending on weighting factors determined for the sub-channels;
• and
• said filter unit having an estimation unit in some of the sub-channels, said estimation unit being configured to calculate the weighting factor of the sub-channel depending on the signal of the sub-channel;
• and
• said filter unit having a receive unit in each case in some other of the sub-channels, said receive unit being configured to receive a calculated weighting factor from another filter unit and to define the calculated weighting factor received from the other filter unit as the weighting factor of the sub-channel.