P.A. system installation method

摘要

The invention concerns a method for transmitting in an area ( 100 ) information items in the form of sound waves representing a signal X(t), through a loudspeaker enclosure ( 2 ), said method comprising a step of setting up a public address system which consists in applying to the input of the loudspeaker enclosure ( 2 ) an electric signal P(t)=W(t) ?X(t) wherein is the convolution product and W(t)=S(-t)? I(t), wherein S(-t) is the temporal return of the pulse response S(t) between the enclosure and the target zone ( 101 ) belonging to the area to be fitted with a P.A. system ( 100 ) t representing time, and I(t) is the temporal response of the product e^-2inft0.Sc (f), wherein f represents the frequency, t 0 is a constant Sc(f)=1/(S 1 (f))^alpha, alpha being a non-null positive number and S 1 (f) being a real function obtained by peak clipping of the modulo I S(f) I of the frequency response S(f) of S(t).