| http://www.w3.org/ns/prov#value | - Even though in the dubbing process a portion of the low-frequency program may be derived from a noise generator, naturally occurring inaudible sound, etc., the most integrated overall effect is achieved if the low-frequency program has at least 50% of its total energy below 40 Hz consisting of components whose frequencies are an integral fraction, plus or minus at most 10%, of respective frequency
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