| http://www.w3.org/ns/prov#value | - The term ???tonal noise??? herein below, refers to a noise which is confined to substantially limited frequency range or ranges, such as the noise generated by the rotors of a helicopter. [0041] Reference is now made to FIGS. 1A, 1B and 1C. FIG. 1A is a schematic illustration of a system for producing a noise-free sound signal, generally referenced 100, constructed and operative in accordance with
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