| 摘要 |
<p>A system for an automatic determination of gain and equalization filter parameters is disclosed. The filter parameters can be used for volume and velocity dependent equalization of audio signals reproduced in a vehicle. The system comprises: an audio amplifier having a configurable volume and being configured to reproduce a test signal using at least one loudspeaker arranged in the passenger compartment of the vehicle so as to generate a corresponding acoustic test signal; at least one microphone arranged at a listening position to pick up the acoustic test signal at different volume settings as well as a noise signal at different velocity values of the vehicle; The system comprises a signal acquisition and processing system to receive the measured test and noise signals as well as the corresponding volume and velocity values. The signal acquisition processing system calculates volume-dependent and velocity-dependent power spectral density estimations of the test and noise signals. The signal acquisition processing system is further configured to calculate volume-dependent and velocity-dependent masking thresholds from the power spectral density estimations. Finally, the signal acquisition processing system calculates a target equalization curve for the equalization filter.</p> |
