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Apparatus for recording, transmission or reproduction of sound; semiconductor components, integrated circuits, semiconductor chips, semiconductor chip sets, circuit board assemblies, computer components, all the aforesaid goods being for use in connection with radio and/or wireless communication transmitters, receivers and synthesizers; control software for controlling and improving sound quality in radio and/or wireless communication transmitters, receivers and synthesizers; graphical user interface software for use in connection with radio and/or wireless communication transmitters, receivers and synthesizers; communications software for use in connecting radio and/or wireless communication transmitters, receivers and synthesizers; semiconductor component layouts in electronic form for use in connection with the design and manufacturing of semiconductors; computer hardware for telecommunications and microphones; computer software for improving voice signal quality and the intelligibility of speech content used in voice interface systems, command and control systems, radio intercom systems, microphone systems, wireless communications systems and telecommunications systems; microphone systems comprising a microphone unit and digital signal processors