Transducer with motion control

摘要

An audio system comprises an electro-acoustic transducer (1) with transducer connections (12, 13) to receive an audio signal (AS) in the audio frequency range from a driver circuit (14) and measure means (11) to measure the excursion of a diaphragm (3) of the electro-acoustic transducer (1), wherein a sensor signal source (16) provides a sensor signal (SS) at the transducer connections (12, 13) with a sensor frequency beyond the audio frequency range and in the range of the resonance frequency of the electro-acoustic transducer and, wherein the measure means (11) comprise a sensor circuit (18) to sense changes of the impedance of the electro-acoustic transducer (1) for the sensor signal (SS) at the transducer connections (12, 13) caused by the excursion of the diaphragm (3) due to the audio signal (AS).

主权项

1. An audio system comprising:
an electro-acoustic transducer having a diaphragm and at least two transducer connection; a driver circuit configured to generate an audio signal in a considered audio frequency range and deliver the audio signal to the transducer connections; and means for measuring the excursion of the diaphragm of the electro-acoustic transducer, the means for measuring comprising:
a sensor signal source configured to provide a sensor signal at the transducer connections with one or more sensor frequencies beyond the considered audio frequency range and in the range of the electrical domain resonance frequency of the electro-acoustic transducer; anda sensor circuit configured to sense changes of the impedance of the electro-acoustic transducer for the sensor signal at the transducer connections caused by the excursion of the diaphragm due to the audio signal.