The display device comprises display means which highlight on a screen, preferably of PFD type, the information useful to the pilot relating to at least one flight parameter, especially while reducing the corresponding scale on said screen. First image obtaining means are for obtaining a first image. The base plate is substantially parallel to the load plate with a spring arrangement disposed intermediate the load plate and the base plate. The initial channel correlation matrix is factorized to produce a Cholesky factor. The number of lines between the reset and read pointers defines the integration time of the imager. Also disclosed are methods for producing sound absorbing wall systems, one method including adhering a soundproofing material to a wallboard material.