Adaptive arrangement for correcting the transfer characteristic of an electrodynamic transducer without additional sensor

摘要

An arrangement is provided for converting an electric signal into an acoustic or a mechanic signal comprising a transducer (1) and an electric circuit connected to the terminals of the transducer (1). An adaptive correction filter (3) compensates for linear and nonlinear distortions of the transducer (1) and realizes a desired overall transfer characteristic of the arrangement. An adaptive detector circuit (2) connected between the filter output (7) and the transducer's terminals provides a motional signal of the transducer at output (11) without using an additional mechanic or acoustic sensor. Reference filter (6) and comparator (13) compare the detected motional signal with a desired signal and provide an error signal e(t) for adaptively adjusting both the correction filter (3) and detector circuit (2) to the transducer. This arrangement dispenses from pre-training and copes with nonlinear and changing transducer characteristics.