Sound tuning system

摘要

The invention relates to a method for automated tuning of a sound system, the sound system comprising delay lines, equalizing filters, and at least two loudspeakers, the method comprising the steps of reproducing a useful sound signal through the loudspeakers, measuring sound pressure values at least one location, providing a target transfer function for tuning the delay lines and the equalizing filters of the sound system, the target transfer function representing a desired transfer characteristics of the sound system, adjusting the delay of the delay lines, and adjusting amplitude responses of the equalizing filters such, that the actual transfer characteristics of the sound system approximates the target function.

主权项

1. A sound tuning system, comprising:
a signal source that provides a useful sound signal; a plurality of cross-over filters, each of the plurality of the cross-over filters receives the useful sound signal and provide an associated cross-over filter output signal; a plurality of adaptive filters, each of the plurality of the adaptive filters uniquely associated with one of the plurality of cross-over filters to receive the associated one of the cross-over filter output signals, where each of the plurality of adaptive filters provides an associated one of a plurality of adaptively filtered signals; a plurality of loudspeakers, each of the plurality of the loudspeakers uniquely associated with one of the plurality of adaptive filters to receive the associated one of the adaptively filtered signals, and where each of the loudspeakers provides an audio output indicative of its associated one of the adaptively filtered signals; a plurality of microphones located at different positions within a hearing space and providing a plurality of microphone signals representing the useful sound signal; a control unit that optimizes filter coefficients of the adaptive filters such that actual transfer characteristics defined by the useful sound signal and the plurality of microphone signals approximates a target function which represents a desired transfer characteristic, where the control unit is adapted to calculate a desired output signal from the useful sound signal using the target function, to calculate error signals representing a difference between measured sound pressure signals and a desired output signal, to generate a total error signal by calculating the weighted sum of the error signals, and to adjust phase and amplitude responses of the adaptive filters such that the total error signal is reduced.