Abstract: In a hearing aid with feedback compensation by virtue of at least one secondary microphone feeding into a delay unit and an attenuator feeding into one input of a difference amplifier, the other input with opposite polarity of which is connected to the output of the primary microphone receiving the ambient sound to be amplified and fed into the hearing-aid receiver and output duct, at least two secondary signal paths are provided. Each path comprises a secondary microphone with its associated delay unit and attenuator. An operational control unit may select the strongest signal to be used for feedback compensation. This makes it possible to achieve feedback compensation in various situations, such as may arise e.g. with an "in-the-ear" hearing aid when the user is chewing or yawning, creating various possible paths from the output duct past the housing of hearing aid to the primary microphone.

Abstract: In a hearing aid with a microphone, an amplifier and a receiver supplying amplified sound to the user, a second signal path is provided comprising a second, feedback-suppressing microphone, placed at a location to receive feedback-causing sound from the receiver. The output of second provided microphone is suitably attenuated and delayed by an amount .DELTA.t corresponding to the effective acoustical distance a+b between the second microphone and the main microphone and supplied to a difference amplifier in opposition to the signal from the main microphone. Thus, the component of the signal from the main microphone likely to cause positive feedback or "howling" is substantially cancelled out. In another embodiment, the feedback-suppressing signal path is an acoustical path comprising a tube leading to a rear cavity in a microphone of the directional or differential type.