| http://www.w3.org/ns/prov#value | - If the minute oscillation frequency of the mirror 124 is set below the cut-off frequency of the low-pass filter 132, such modulations as shown in FIGS. 16(a), (b) and (c) are applied to tracking error points A, B and C, resulting in that such outputs as (d), (e) and (f) are superimposed on the output of the low-pass filter 132.
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