| http://www.w3.org/ns/prov#value | - When such a signal as recorded is detected in reproduction, a waveform of reproduction signal 36 is observed as shown in FIG. 13, which indicates that the intensity of the laser beam 24d is modulated largely by the low frequency FM signal generated by the FM modulator 43, and is superposed (as an additional modulation) with the information signal 38, an amplitude of which is defined by an upper en
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