ECHOUSING PROCEDURES AND ECHOUSING DEVICES FOR ELECTROACTIVE COMMUNICATION DEVICES

摘要

A feedback release device for an electroacoustic communication device, comprising:a signal transmission path for the generation and output of an output audio signal to an external environment by an electrodynamic loudspeaker;where the signal transfer path includes a digital analogue converter (204) and an output amplifier (206) designed to apply a pulsed pulse current and voltage of the electrodynamic loudspeaker (1) from an audio signal to a control node (203);a signal reception path which is a microphone (212) to produce a microphone input signal corresponding to a sound received from the outside environment; and includes a first A/D converter (214) to generate a corresponding digital microphone signal on a sounding node (215) of the audio signal path by scanning and digitising the microphone input signal,where the output audio signal is acoustically coupled to the microphone via an external feedback pathway (Hf(s)), which has a constant or time-changing transmission function;a second A/D converter (308) designed to scan and digitize the pulse voltage and/or pulse current intensity; andan electronic feedback loop that is connected between the signal transfer node (203) and the signal receipt node (215) to generate a feedback output signal on the aggregation nodes (215),where the electronic feedback pathway includes:a non-linear digital loudspeaker model (218), comprising several loudspeaker parameters comprising at least one non-linear loudspeaker parameter derived from the wavelength and/or pulse voltage of the electrodynamic loudspeaker (1);where at least one non-linear loudspeaker parameter is represented by a non-linear function between at least one non-linear loudspeaker parameter and a predetermined loudspeaker variable,an adaptive digital filter (210) that is sequentially connected with the non-linear digital loudspeaker model (218) and designed to model at least the constant or time-changing transmission function of the external feedback pathway.