Patent ID: 6865274

Claim:
A loudspeaker protection system comprising: filter means for defining one or more frequency bands of an audio signal; controllable amplifier/attenuator means coupled to the filter means; and processing means coupled to control the amplifier/attenuator means, such as to determine audio power in at least one of said frequency bands representing relevant loudspeaker protection information used for selective audio power control in said at least one frequency band; characterized in that the processing means determines the audio power S j in frequency band j in proportion to: v jtop 2 *R{Y j }, where v jtop is the peak value of the amplitude of the frequency components in frequency band j, and R{Y j } is the real part of the electric admittance of the loudspeaker in frequency band j, and the processing means sums the audio power S j in the plurality of frequency bands over a specified sub-range of possible values of j, where j ranges from 1, 2, . . . n.