| http://www.w3.org/ns/prov#value | - digital audio signal to a serial-to-parallel conversion and thereafter to a digital-to-analog conversion and for generating an n-value frequency modulated signal having said n-value analog signal as a modulating signal thereof, where n is an integer greater than or equal to three; and recording means comprising rotary magnetic heads for recording said n-value frequency modulated signal and said f
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