Patent ID: 8396225

Claim:
A method for an automatic equalization of sound pressure levels in at least one listening location, the sound pressure level being generated by a first loudspeaker and second loudspeaker, the method comprising: determining a transfer characteristic of each combination the loudspeakers and listening location; calculating a sound pressure level at each listening location assuming that an audio signal of a programmable frequency is supplied to each loudspeaker, where the audio signal supplied to the second loudspeaker is phase-shifted by a programmable phase shift relative to the audio signal supplied to the first loudspeaker, and where the phase shift of the audio signal supplied to the other loudspeakers is initially zero or constant; providing a cost function dependent on the sound pressure level; and obtaining a phase function representing an optimal phase shift as a function of frequency by searching a frequency dependent optimal phase shift that yields an extremum of the cost function.