Octave (Filtering) 2
Octave (Filtering) 2 :
In music, the eighth full tone above (or below) a given tone having twice (or half) as many vibrations per second, e.g., the concert pitch a 1 has a frequency of 440 Hz, while the tone a 2, which is one octave higher, has a frequency of 880 Hz. Seismographs typically record (filter) ground motion oscillations within a range of one (narrow-band) to 12 octaves (very broadband)
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