The present invention provides photonic devices utilized in optical telecommunications. The floor mat system consists of a frame structure either mechanical or rubberized in construction. The method uses phase-delay look-up tables to efficiently determine phase delays for a given frequency bin number k based upon a candidate source location and a microphone location, thereby reducing system memory requirements. An advantage of the MRAM architecture according to the present invention is that it allows lower power consumption than prior art devices and high selectivity during writing. Whether a write request is processed or not is based on the user and whether the file to be written contains a watermark. After reading data from at least one memory cell without outputting the read data through an inputoutput module of the memory circuit in the stand-by mode, it is determined whether the read data is a soft error.