P.A. system installation method

Details P.A. system installation method P.A. system installation method

2007-01-30

2007-01-30

Grier, Laura A. (Department: 2615)

Electrical audio signal processing systems and devices

One-way audio signal program distribution

C381S080000, C381S097000, C381S098000, C381S061000, C381S103000

Reexamination Certificate

active

10517431

ABSTRACT:
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, t0is a constant Sc(f)=1/(S1(f))α, α being a non-null positive number and S1(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).

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