| http://www.w3.org/ns/prov#value | - The variable frequency, pulse duration, i.e., pulse width, modulated output of modulator and amplifier 12 is derived by comparing the amplitude of the output of oscillator 95 with the output of audio frequency source 11 and changing the level of a bilevel wave each time the relative polarity between the output of oscillator 95 and source 11 changes, i.e., each time there is a cross over between th
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