9 electronic apparatus for digital data processing and analysis, namely measurement systems comprising data acquisition, data visualization, frequency domain transformation and signal generators; apparatus for digital recording, transmission and reproduction of sound and images, namely digital mixing desks for TV and radio studios, digital radios,digital audio recorders and digital video recorders, digital audio recorders, digital home theater systems comprising audio decoder, video decoder, audio amplifier, television screen/display and speakers, set-top-boxes, digital data compressors/decompressors; digital data and signal processing systems, namely microprocessor modules and digital signal processor modules; blank magnetic data carriers and blank magnetic data recording carriers; blank optical data carriers and blank optical data recording carriers; blank mechanical data carriers and blank mechanical data recording carriers; computer software for processors and operating systems for analysis, processing, generation and visualization of digital signals, such as sound, images and measurement data; electronic components, namely programmable logic semiconductors and microprocessors; computer software and computer hardware for development of signal and data processing systems; computer software and computer hardware for development of software and hardware for signal and data processing systems