Hearing device comprising a feedback detection unit

A hearing device comprising a forward path for processing an electric signal representing sound, the forward path comprising

• an input unit for receiving or providing an electric input signal representing sound,
• a signal processing unit for applying a frequency- and/or level-dependent gain to an input signal of the forward path and providing a processed output signal, and
• an output transducer for generating stimuli perceivable as sound to a user;
• the hearing device further comprising
• a feedback detection unit configured to detect feedback or evaluate a risk of feedback via an acoustic or mechanical or electrical feedback path from said output transducer to said input unit,
• a loop consisting of said forward path and said feedback path being defined, the loop exhibiting a loop delay D,
• wherein said feedback detection unit comprises
• a magnitude and phase analysis unit for repeatedly determining magnitude and phase of said electric input signal or a processed version thereof, and further configured to determine values of loop magnitude, loop phase, and loop phase difference signals, respectively, based thereon and on said loop delay D, where said loop phase difference is the difference between values of the parameter loop phase at a given time instant, m, and a time instant, mD, one feedback loop delay D earlier;
• a feedback conditions and detection unit configured to check criteria for magnitude and phase feedback condition, respectively, based on said values of loop magnitude, and loop phase difference signals, respectively, and to provide feedback detection signal indicative of feedback or a risk of feedback.