| http://www.w3.org/ns/prov#value | - When such a signal as recorded is detected in reproduction, a waveform of reproduction signal 33 is observed as shown in FIG. 9, which indicates that the intensity of the laser beam 24c is modulated largely by the low single frequency signal generated by the FG 23, and is superposed (as an additional modulation) with the information signal 34, an amplitude of which is defined by an upper envelope
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